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.6em;}\n table.ts-table thead th{font-size:.82em;padding:.5em .6em;}\n table.ts-table td.ts-num{white-space:nowrap;text-align:center;}\n table.ts-table td.ts-w{text-align:left;font-weight:600;}\n table.ts-table tr.ts-grouprow td{background:var(--aobo-bg,#f4f6f8);font-weight:700;\n text-align:left;color:var(--aobo-text);border-top:1px solid var(--aobo-border);}\n .ts-props a{color:var(--aobo-blue) !important;text-decoration:none !important;}\n .ts-props a:hover{text-decoration:underline !important;}\n .ts-rel{margin-top:1.2em;background:#fff;border:1px solid var(--aobo-border);\n border-left:3px solid var(--aobo-blue);border-radius:0 var(--aobo-radius) var(--aobo-radius) 0;padding:1em 1.2em;}\n .ts-rel h3{margin:0 0 .5em;font-size:.95em;color:var(--aobo-text);}\n .ts-rel p{margin:0;font-size:.85em;line-height:1.9;color:var(--aobo-muted);}\n .ts-rel p a{font-weight:600;}\n<\/style>\n<\/head>\n<body>\n<section class=\"aobo-ht-ref ts-props\">\n <div class=\"aobo-wrap\">\n <div class=\"ts-hero\">\n <div class=\"ts-hero-top\">\n <div class=\"ts-kicker\"><span><\/span>Tool Steel Reference Data<\/div>\n <h1>Tool Steel Machining Allowances Chart<\/h1>\n <p>Standard machining allowances for hot-rolled tool steel square and flat bars: how much stock to remove from the top, bottom and edge surfaces of the as-supplied mill form, by specified bar thickness and width. These are the allowances to plan for when ordering tool steel bar and preparing it for heat treatment.<\/p>\n <\/div>\n <div class=\"ts-tool-area\">\n <div class=\"ts-legend\">\n <span><b>Top and bottom surfaces<\/b> allowance per face<\/span>\n <span><b>Edges<\/b> allowance per edge<\/span>\n <span><b>(a)<\/b> minimum allowance per side<\/span>\n <\/div>\n <div class=\"ts-table-wrap\">\n <table class=\"ts-table\">\n <thead>\n <tr><th rowspan=\"2\">Specified width<br>mm<\/th><th rowspan=\"2\">Specified width<br>in.<\/th><th colspan=\"2\">Machining allowance (a) — top and bottom surfaces<\/th><th colspan=\"2\">Machining allowance (a) — edges<\/th><\/tr><tr><th>mm<\/th><th>in.<\/th><th>mm<\/th><th>in.<\/th><\/tr>\n <\/thead>\n <tbody>\n<tr class=\"ts-grouprow\"><td colspan=\"6\">Specified thickness: under 12.7 mm (1\/2 in.)<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">0-12.7<\/td><td class=\"ts-num ts-w\">0-1\/4<\/td><td class=\"ts-num\">0.64<\/td><td class=\"ts-num\">0.025<\/td><td class=\"ts-num\">0.64<\/td><td class=\"ts-num\">0.025<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>12.7-25.4<\/td><td class=\"ts-num ts-w\">>1\/4-1<\/td><td class=\"ts-num\">0.64<\/td><td class=\"ts-num\">0.025<\/td><td class=\"ts-num\">0.89<\/td><td class=\"ts-num\">0.035<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>25.4-50.8<\/td><td class=\"ts-num ts-w\">>1-2<\/td><td class=\"ts-num\">0.76<\/td><td class=\"ts-num\">0.030<\/td><td class=\"ts-num\">1.02<\/td><td class=\"ts-num\">0.040<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>50.8-76.2<\/td><td class=\"ts-num ts-w\">>2-3<\/td><td class=\"ts-num\">0.89<\/td><td class=\"ts-num\">0.035<\/td><td class=\"ts-num\">1.27<\/td><td class=\"ts-num\">0.050<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>76.2-101.6<\/td><td class=\"ts-num ts-w\">>3-4<\/td><td class=\"ts-num\">1.02<\/td><td class=\"ts-num\">0.040<\/td><td class=\"ts-num\">1.65<\/td><td class=\"ts-num\">0.065<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>101.6-127.0<\/td><td class=\"ts-num ts-w\">>4-5<\/td><td class=\"ts-num\">1.14<\/td><td class=\"ts-num\">0.045<\/td><td class=\"ts-num\">2.03<\/td><td class=\"ts-num\">0.080<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>127.0-152.4<\/td><td class=\"ts-num ts-w\">>5-6<\/td><td class=\"ts-num\">1.27<\/td><td class=\"ts-num\">0.050<\/td><td class=\"ts-num\">2.41<\/td><td class=\"ts-num\">0.095<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>152.4-177.8<\/td><td class=\"ts-num ts-w\">>6-7<\/td><td class=\"ts-num\">1.40<\/td><td class=\"ts-num\">0.055<\/td><td class=\"ts-num\">2.67<\/td><td class=\"ts-num\">0.105<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>177.8-203.2<\/td><td class=\"ts-num ts-w\">>7-8<\/td><td class=\"ts-num\">1.52<\/td><td class=\"ts-num\">0.060<\/td><td class=\"ts-num\">3.05<\/td><td class=\"ts-num\">0.120<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>203.2-228.6<\/td><td class=\"ts-num ts-w\">>8-9<\/td><td class=\"ts-num\">1.52<\/td><td class=\"ts-num\">0.060<\/td><td class=\"ts-num\">3.30<\/td><td class=\"ts-num\">0.130<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>228.6-304.8<\/td><td class=\"ts-num ts-w\">>9-12<\/td><td class=\"ts-num\">1.52<\/td><td class=\"ts-num\">0.060<\/td><td class=\"ts-num\">3.56<\/td><td class=\"ts-num\">0.140<\/td><\/tr>\n<tr class=\"ts-grouprow\"><td colspan=\"6\">Specified thickness: over 12.7 to 25.4 mm (over 1\/4 to 1 in.)<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>12.7-25.4<\/td><td class=\"ts-num ts-w\">>1\/4-1<\/td><td class=\"ts-num\">1.14<\/td><td class=\"ts-num\">0.045<\/td><td class=\"ts-num\">1.14<\/td><td class=\"ts-num\">0.045<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>25.4-50.8<\/td><td class=\"ts-num ts-w\">>1-2<\/td><td class=\"ts-num\">1.14<\/td><td class=\"ts-num\">0.045<\/td><td class=\"ts-num\">1.27<\/td><td class=\"ts-num\">0.050<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>50.8-76.2<\/td><td class=\"ts-num ts-w\">>2-3<\/td><td class=\"ts-num\">1.27<\/td><td class=\"ts-num\">0.050<\/td><td class=\"ts-num\">1.52<\/td><td class=\"ts-num\">0.060<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>76.2-101.6<\/td><td class=\"ts-num ts-w\">>3-4<\/td><td class=\"ts-num\">1.40<\/td><td class=\"ts-num\">0.055<\/td><td class=\"ts-num\">1.90<\/td><td class=\"ts-num\">0.075<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>101.6-127.0<\/td><td class=\"ts-num ts-w\">>4-5<\/td><td class=\"ts-num\">1.52<\/td><td class=\"ts-num\">0.060<\/td><td class=\"ts-num\">2.41<\/td><td class=\"ts-num\">0.095<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>127.0-152.4<\/td><td class=\"ts-num ts-w\">>5-6<\/td><td class=\"ts-num\">1.65<\/td><td class=\"ts-num\">0.065<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>152.4-177.8<\/td><td class=\"ts-num ts-w\">>6-7<\/td><td class=\"ts-num\">1.78<\/td><td class=\"ts-num\">0.070<\/td><td class=\"ts-num\">3.30<\/td><td class=\"ts-num\">0.130<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>177.8-203.2<\/td><td class=\"ts-num ts-w\">>7-8<\/td><td class=\"ts-num\">1.90<\/td><td class=\"ts-num\">0.075<\/td><td class=\"ts-num\">3.81<\/td><td class=\"ts-num\">0.150<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>203.2-228.6<\/td><td class=\"ts-num ts-w\">>8-9<\/td><td class=\"ts-num\">1.90<\/td><td class=\"ts-num\">0.075<\/td><td class=\"ts-num\">3.94<\/td><td class=\"ts-num\">0.155<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>228.6-304.8<\/td><td class=\"ts-num ts-w\">>9-12<\/td><td class=\"ts-num\">1.90<\/td><td class=\"ts-num\">0.075<\/td><td class=\"ts-num\">3.94<\/td><td class=\"ts-num\">0.155<\/td><\/tr>\n<tr class=\"ts-grouprow\"><td colspan=\"6\">Specified thickness: over 25.4 to 50.8 mm (over 1 to 2 in.)<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>25.4-50.8<\/td><td class=\"ts-num ts-w\">>1-2<\/td><td class=\"ts-num\">1.65<\/td><td class=\"ts-num\">0.065<\/td><td class=\"ts-num\">1.65<\/td><td class=\"ts-num\">0.065<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>50.8-76.2<\/td><td class=\"ts-num ts-w\">>2-3<\/td><td class=\"ts-num\">1.65<\/td><td class=\"ts-num\">0.065<\/td><td class=\"ts-num\">1.78<\/td><td class=\"ts-num\">0.070<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>76.2-101.6<\/td><td class=\"ts-num ts-w\">>3-4<\/td><td class=\"ts-num\">1.78<\/td><td class=\"ts-num\">0.070<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>101.6-127.0<\/td><td class=\"ts-num ts-w\">>4-5<\/td><td class=\"ts-num\">1.78<\/td><td class=\"ts-num\">0.070<\/td><td class=\"ts-num\">2.67<\/td><td class=\"ts-num\">0.105<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>127.0-152.4<\/td><td class=\"ts-num ts-w\">>5-6<\/td><td class=\"ts-num\">1.90<\/td><td class=\"ts-num\">0.075<\/td><td class=\"ts-num\">3.18<\/td><td class=\"ts-num\">0.125<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>152.4-177.8<\/td><td class=\"ts-num ts-w\">>6-7<\/td><td class=\"ts-num\">2.03<\/td><td class=\"ts-num\">0.080<\/td><td class=\"ts-num\">3.68<\/td><td class=\"ts-num\">0.145<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>177.8-203.2<\/td><td class=\"ts-num ts-w\">>7-8<\/td><td class=\"ts-num\">2.03<\/td><td class=\"ts-num\">0.080<\/td><td class=\"ts-num\">4.19<\/td><td class=\"ts-num\">0.165<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>203.2-228.6<\/td><td class=\"ts-num ts-w\">>8-9<\/td><td class=\"ts-num\">2.41<\/td><td class=\"ts-num\">0.095<\/td><td class=\"ts-num\">4.32<\/td><td class=\"ts-num\">0.170<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>228.6-304.8<\/td><td class=\"ts-num ts-w\">>9-12<\/td><td class=\"ts-num\">2.54<\/td><td class=\"ts-num\">0.100<\/td><td class=\"ts-num\">4.32<\/td><td class=\"ts-num\">0.170<\/td><\/tr>\n<tr class=\"ts-grouprow\"><td colspan=\"6\">Specified thickness: over 50.8 to 76.2 mm (over 2 to 3 in.)<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>50.8-76.2<\/td><td class=\"ts-num ts-w\">>2-3<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>76.2-101.6<\/td><td class=\"ts-num ts-w\">>3-4<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><td class=\"ts-num\">2.54<\/td><td class=\"ts-num\">0.100<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>101.6-127.0<\/td><td class=\"ts-num ts-w\">>4-5<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><td class=\"ts-num\">3.05<\/td><td class=\"ts-num\">0.120<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>127.0-152.4<\/td><td class=\"ts-num ts-w\">>5-6<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><td class=\"ts-num\">3.43<\/td><td class=\"ts-num\">0.135<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>152.4-177.8<\/td><td class=\"ts-num ts-w\">>6-7<\/td><td class=\"ts-num\">2.29<\/td><td class=\"ts-num\">0.090<\/td><td class=\"ts-num\">3.94<\/td><td class=\"ts-num\">0.155<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>177.8-203.2<\/td><td class=\"ts-num ts-w\">>7-8<\/td><td class=\"ts-num\">2.54<\/td><td class=\"ts-num\">0.100<\/td><td class=\"ts-num\">4.32<\/td><td class=\"ts-num\">0.170<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>203.2-228.6<\/td><td class=\"ts-num ts-w\">>8-9<\/td><td class=\"ts-num\">2.54<\/td><td class=\"ts-num\">0.100<\/td><td class=\"ts-num\">4.83<\/td><td class=\"ts-num\">0.190<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>228.6-304.8<\/td><td class=\"ts-num ts-w\">>9-12<\/td><td class=\"ts-num\">2.54<\/td><td class=\"ts-num\">0.100<\/td><td class=\"ts-num\">4.83<\/td><td class=\"ts-num\">0.190<\/td><\/tr>\n<tr class=\"ts-grouprow\"><td colspan=\"6\">Specified thickness: over 76.2 to 101.6 mm (over 3 to 4 in.)<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>76.2-101.6<\/td><td class=\"ts-num ts-w\">>3-4<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>101.6-127.0<\/td><td class=\"ts-num ts-w\">>4-5<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><td class=\"ts-num\">3.18<\/td><td class=\"ts-num\">0.125<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>127.0-152.4<\/td><td class=\"ts-num ts-w\">>5-6<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><td class=\"ts-num\">3.56<\/td><td class=\"ts-num\">0.140<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>152.4-177.8<\/td><td class=\"ts-num ts-w\">>6-7<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><td class=\"ts-num\">4.32<\/td><td class=\"ts-num\">0.170<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>177.8-203.2<\/td><td class=\"ts-num ts-w\">>7-8<\/td><td class=\"ts-num\">3.18<\/td><td class=\"ts-num\">0.125<\/td><td class=\"ts-num\">4.83<\/td><td class=\"ts-num\">0.190<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>203.2-228.6<\/td><td class=\"ts-num ts-w\">>8-9<\/td><td class=\"ts-num\">3.18<\/td><td class=\"ts-num\">0.125<\/td><td class=\"ts-num\">4.83<\/td><td class=\"ts-num\">0.190<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>228.6-304.8<\/td><td class=\"ts-num ts-w\">>9-12<\/td><td class=\"ts-num\">3.18<\/td><td class=\"ts-num\">0.125<\/td><td class=\"ts-num\">4.83<\/td><td class=\"ts-num\">0.190<\/td><\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <ul class=\"ts-notes-list\">\n <li><sup>(a)<\/sup> Minimum allowance per side for machining prior to heat treatment. Maximum decarburization limit, 80% of machining allowance.<\/li>\n <\/ul>\n <div class=\"ts-disclaimer\">\n <h3>Table notes<\/h3>\n <p>Standard machining allowances for hot-rolled square and flat bars: the recommended total stock to remove from the as-supplied mill form to reach a surface free of scale, seams and other imperfections, and suitable for heat treatment and service.<\/p>\n <p>Bar weight for a given size, before any allowance is removed, is in the <a href=\"https:\/\/aobosteel.com\/steel-weight-calculator-for-round-bar-and-plate\/\">steel weight calculator for round bar and plate<\/a>.<\/p>\n <p>In addition to these standard allowances, extra stock must be provided for the cleanup of any decarburization or distortion that occurs during final heat treatment — the amount varies with the type of tool steel and the hardening treatment.<\/p>\n <p>Allowances for other shapes and other methods of forming and finishing are given in ASTM specifications A 600, A 681 and A 686.<\/p>\n <p>Metric and imperial allowance values are as printed in the source; the inch values are the standard figures (for example 0.025 in. ≈ 0.64 mm).<\/p>\n <\/div>\n <div class=\"ts-rel\">\n <h3>Related reference pages<\/h3>\n <p><a href=\"\/d2-tool-steel\/\">D2 tool steel<\/a> · <a href=\"\/o1-tool-steel\/\">O1 tool steel<\/a> · <a href=\"\/h13-tool-steel\/\">H13 tool steel<\/a> · <a href=\"\/tool-steel-machinability-rating-chart\/\">Tool steel machinability rating chart<\/a> · <a href=\"\/tool-steel-properties-chart\/\">Tool steel properties chart<\/a> · <a href=\"\/tool-steel-density-thermal-expansion\/\">Tool steel density and thermal expansion<\/a><\/p>\n <\/div>\n <p class=\"ts-source\">Source: ASM Handbook, Volume 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys, Table 17 “Standard machining allowances for hot-rolled square and flat bars” (10th ed., pp. 1833–1836). Reference data for comparison — verify the applicable heat treatment before design use.<\/p>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>Tool Steel Machining Allowances Chart – Hot-Rolled Square and Flat Bars | Aobo Steel Tool Steel Reference Data Tool Steel Machining Allowances Chart Standard machining allowances for hot-rolled tool steel square and flat bars: how much stock to remove from the top, bottom and edge surfaces of the as-supplied mill form, by specified bar thickness […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-18274","page","type-page","status-publish","hentry"],"yoast_head":"\n<title>Tool Steel Machining Allowance Chart - 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.5em;font-size:.95em;color:var(--aobo-text);}\n .ts-rel p{margin:0;font-size:.85em;line-height:1.9;color:var(--aobo-muted);}\n .ts-rel p a{font-weight:600;}\n<\/style>\n<\/head>\n<body>\n<section class=\"aobo-ht-ref ts-props\">\n <div class=\"aobo-wrap\">\n <div class=\"ts-hero\">\n <div class=\"ts-hero-top\">\n <div class=\"ts-kicker\"><span><\/span>Tool Steel Reference Data<\/div>\n <h1>Tool Steel Machining Allowances Chart<\/h1>\n <p>Standard machining allowances for hot-rolled tool steel square and flat bars: how much stock to remove from the top, bottom and edge surfaces of the as-supplied mill form, by specified bar thickness and width. These are the allowances to plan for when ordering tool steel bar and preparing it for heat treatment.<\/p>\n <\/div>\n <div class=\"ts-tool-area\">\n <div class=\"ts-legend\">\n <span><b>Top and bottom surfaces<\/b> allowance per face<\/span>\n <span><b>Edges<\/b> allowance per edge<\/span>\n <span><b>(a)<\/b> minimum allowance per side<\/span>\n <\/div>\n <div class=\"ts-table-wrap\">\n <table class=\"ts-table\">\n <thead>\n <tr><th rowspan=\"2\">Specified width<br>mm<\/th><th rowspan=\"2\">Specified width<br>in.<\/th><th colspan=\"2\">Machining allowance (a) — top and bottom surfaces<\/th><th colspan=\"2\">Machining allowance (a) — edges<\/th><\/tr><tr><th>mm<\/th><th>in.<\/th><th>mm<\/th><th>in.<\/th><\/tr>\n <\/thead>\n <tbody>\n<tr class=\"ts-grouprow\"><td colspan=\"6\">Specified thickness: under 12.7 mm (1\/2 in.)<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">0-12.7<\/td><td class=\"ts-num ts-w\">0-1\/4<\/td><td class=\"ts-num\">0.64<\/td><td class=\"ts-num\">0.025<\/td><td class=\"ts-num\">0.64<\/td><td class=\"ts-num\">0.025<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>12.7-25.4<\/td><td class=\"ts-num ts-w\">>1\/4-1<\/td><td class=\"ts-num\">0.64<\/td><td class=\"ts-num\">0.025<\/td><td class=\"ts-num\">0.89<\/td><td class=\"ts-num\">0.035<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>25.4-50.8<\/td><td class=\"ts-num ts-w\">>1-2<\/td><td class=\"ts-num\">0.76<\/td><td class=\"ts-num\">0.030<\/td><td class=\"ts-num\">1.02<\/td><td class=\"ts-num\">0.040<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>50.8-76.2<\/td><td class=\"ts-num ts-w\">>2-3<\/td><td class=\"ts-num\">0.89<\/td><td class=\"ts-num\">0.035<\/td><td class=\"ts-num\">1.27<\/td><td class=\"ts-num\">0.050<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>76.2-101.6<\/td><td class=\"ts-num ts-w\">>3-4<\/td><td class=\"ts-num\">1.02<\/td><td class=\"ts-num\">0.040<\/td><td class=\"ts-num\">1.65<\/td><td class=\"ts-num\">0.065<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>101.6-127.0<\/td><td class=\"ts-num ts-w\">>4-5<\/td><td class=\"ts-num\">1.14<\/td><td class=\"ts-num\">0.045<\/td><td class=\"ts-num\">2.03<\/td><td class=\"ts-num\">0.080<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>127.0-152.4<\/td><td class=\"ts-num ts-w\">>5-6<\/td><td class=\"ts-num\">1.27<\/td><td class=\"ts-num\">0.050<\/td><td class=\"ts-num\">2.41<\/td><td class=\"ts-num\">0.095<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>152.4-177.8<\/td><td class=\"ts-num ts-w\">>6-7<\/td><td class=\"ts-num\">1.40<\/td><td class=\"ts-num\">0.055<\/td><td class=\"ts-num\">2.67<\/td><td class=\"ts-num\">0.105<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>177.8-203.2<\/td><td class=\"ts-num ts-w\">>7-8<\/td><td class=\"ts-num\">1.52<\/td><td class=\"ts-num\">0.060<\/td><td class=\"ts-num\">3.05<\/td><td class=\"ts-num\">0.120<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>203.2-228.6<\/td><td class=\"ts-num ts-w\">>8-9<\/td><td class=\"ts-num\">1.52<\/td><td class=\"ts-num\">0.060<\/td><td class=\"ts-num\">3.30<\/td><td class=\"ts-num\">0.130<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>228.6-304.8<\/td><td class=\"ts-num ts-w\">>9-12<\/td><td class=\"ts-num\">1.52<\/td><td class=\"ts-num\">0.060<\/td><td class=\"ts-num\">3.56<\/td><td class=\"ts-num\">0.140<\/td><\/tr>\n<tr class=\"ts-grouprow\"><td colspan=\"6\">Specified thickness: over 12.7 to 25.4 mm (over 1\/4 to 1 in.)<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>12.7-25.4<\/td><td class=\"ts-num ts-w\">>1\/4-1<\/td><td class=\"ts-num\">1.14<\/td><td class=\"ts-num\">0.045<\/td><td class=\"ts-num\">1.14<\/td><td class=\"ts-num\">0.045<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>25.4-50.8<\/td><td class=\"ts-num ts-w\">>1-2<\/td><td class=\"ts-num\">1.14<\/td><td class=\"ts-num\">0.045<\/td><td class=\"ts-num\">1.27<\/td><td class=\"ts-num\">0.050<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>50.8-76.2<\/td><td class=\"ts-num ts-w\">>2-3<\/td><td class=\"ts-num\">1.27<\/td><td class=\"ts-num\">0.050<\/td><td class=\"ts-num\">1.52<\/td><td class=\"ts-num\">0.060<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>76.2-101.6<\/td><td class=\"ts-num ts-w\">>3-4<\/td><td class=\"ts-num\">1.40<\/td><td class=\"ts-num\">0.055<\/td><td class=\"ts-num\">1.90<\/td><td class=\"ts-num\">0.075<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>101.6-127.0<\/td><td class=\"ts-num ts-w\">>4-5<\/td><td class=\"ts-num\">1.52<\/td><td class=\"ts-num\">0.060<\/td><td class=\"ts-num\">2.41<\/td><td class=\"ts-num\">0.095<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>127.0-152.4<\/td><td class=\"ts-num ts-w\">>5-6<\/td><td class=\"ts-num\">1.65<\/td><td class=\"ts-num\">0.065<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>152.4-177.8<\/td><td class=\"ts-num ts-w\">>6-7<\/td><td class=\"ts-num\">1.78<\/td><td class=\"ts-num\">0.070<\/td><td class=\"ts-num\">3.30<\/td><td class=\"ts-num\">0.130<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>177.8-203.2<\/td><td class=\"ts-num ts-w\">>7-8<\/td><td class=\"ts-num\">1.90<\/td><td class=\"ts-num\">0.075<\/td><td class=\"ts-num\">3.81<\/td><td class=\"ts-num\">0.150<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>203.2-228.6<\/td><td class=\"ts-num ts-w\">>8-9<\/td><td class=\"ts-num\">1.90<\/td><td class=\"ts-num\">0.075<\/td><td class=\"ts-num\">3.94<\/td><td class=\"ts-num\">0.155<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>228.6-304.8<\/td><td class=\"ts-num ts-w\">>9-12<\/td><td class=\"ts-num\">1.90<\/td><td class=\"ts-num\">0.075<\/td><td class=\"ts-num\">3.94<\/td><td class=\"ts-num\">0.155<\/td><\/tr>\n<tr class=\"ts-grouprow\"><td colspan=\"6\">Specified thickness: over 25.4 to 50.8 mm (over 1 to 2 in.)<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>25.4-50.8<\/td><td class=\"ts-num ts-w\">>1-2<\/td><td class=\"ts-num\">1.65<\/td><td class=\"ts-num\">0.065<\/td><td class=\"ts-num\">1.65<\/td><td class=\"ts-num\">0.065<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>50.8-76.2<\/td><td class=\"ts-num ts-w\">>2-3<\/td><td class=\"ts-num\">1.65<\/td><td class=\"ts-num\">0.065<\/td><td class=\"ts-num\">1.78<\/td><td class=\"ts-num\">0.070<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>76.2-101.6<\/td><td class=\"ts-num ts-w\">>3-4<\/td><td class=\"ts-num\">1.78<\/td><td class=\"ts-num\">0.070<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>101.6-127.0<\/td><td class=\"ts-num ts-w\">>4-5<\/td><td class=\"ts-num\">1.78<\/td><td class=\"ts-num\">0.070<\/td><td class=\"ts-num\">2.67<\/td><td class=\"ts-num\">0.105<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>127.0-152.4<\/td><td class=\"ts-num ts-w\">>5-6<\/td><td class=\"ts-num\">1.90<\/td><td class=\"ts-num\">0.075<\/td><td class=\"ts-num\">3.18<\/td><td class=\"ts-num\">0.125<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>152.4-177.8<\/td><td class=\"ts-num ts-w\">>6-7<\/td><td class=\"ts-num\">2.03<\/td><td class=\"ts-num\">0.080<\/td><td class=\"ts-num\">3.68<\/td><td class=\"ts-num\">0.145<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>177.8-203.2<\/td><td class=\"ts-num ts-w\">>7-8<\/td><td class=\"ts-num\">2.03<\/td><td class=\"ts-num\">0.080<\/td><td class=\"ts-num\">4.19<\/td><td class=\"ts-num\">0.165<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>203.2-228.6<\/td><td class=\"ts-num ts-w\">>8-9<\/td><td class=\"ts-num\">2.41<\/td><td class=\"ts-num\">0.095<\/td><td class=\"ts-num\">4.32<\/td><td class=\"ts-num\">0.170<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>228.6-304.8<\/td><td class=\"ts-num ts-w\">>9-12<\/td><td class=\"ts-num\">2.54<\/td><td class=\"ts-num\">0.100<\/td><td class=\"ts-num\">4.32<\/td><td class=\"ts-num\">0.170<\/td><\/tr>\n<tr class=\"ts-grouprow\"><td colspan=\"6\">Specified thickness: over 50.8 to 76.2 mm (over 2 to 3 in.)<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>50.8-76.2<\/td><td class=\"ts-num ts-w\">>2-3<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>76.2-101.6<\/td><td class=\"ts-num ts-w\">>3-4<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><td class=\"ts-num\">2.54<\/td><td class=\"ts-num\">0.100<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>101.6-127.0<\/td><td class=\"ts-num ts-w\">>4-5<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><td class=\"ts-num\">3.05<\/td><td class=\"ts-num\">0.120<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>127.0-152.4<\/td><td class=\"ts-num ts-w\">>5-6<\/td><td class=\"ts-num\">2.16<\/td><td class=\"ts-num\">0.085<\/td><td class=\"ts-num\">3.43<\/td><td class=\"ts-num\">0.135<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>152.4-177.8<\/td><td class=\"ts-num ts-w\">>6-7<\/td><td class=\"ts-num\">2.29<\/td><td class=\"ts-num\">0.090<\/td><td class=\"ts-num\">3.94<\/td><td class=\"ts-num\">0.155<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>177.8-203.2<\/td><td class=\"ts-num ts-w\">>7-8<\/td><td class=\"ts-num\">2.54<\/td><td class=\"ts-num\">0.100<\/td><td class=\"ts-num\">4.32<\/td><td class=\"ts-num\">0.170<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>203.2-228.6<\/td><td class=\"ts-num ts-w\">>8-9<\/td><td class=\"ts-num\">2.54<\/td><td class=\"ts-num\">0.100<\/td><td class=\"ts-num\">4.83<\/td><td class=\"ts-num\">0.190<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>228.6-304.8<\/td><td class=\"ts-num ts-w\">>9-12<\/td><td class=\"ts-num\">2.54<\/td><td class=\"ts-num\">0.100<\/td><td class=\"ts-num\">4.83<\/td><td class=\"ts-num\">0.190<\/td><\/tr>\n<tr class=\"ts-grouprow\"><td colspan=\"6\">Specified thickness: over 76.2 to 101.6 mm (over 3 to 4 in.)<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>76.2-101.6<\/td><td class=\"ts-num ts-w\">>3-4<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>101.6-127.0<\/td><td class=\"ts-num ts-w\">>4-5<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><td class=\"ts-num\">3.18<\/td><td class=\"ts-num\">0.125<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>127.0-152.4<\/td><td class=\"ts-num ts-w\">>5-6<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><td class=\"ts-num\">3.56<\/td><td class=\"ts-num\">0.140<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>152.4-177.8<\/td><td class=\"ts-num ts-w\">>6-7<\/td><td class=\"ts-num\">2.92<\/td><td class=\"ts-num\">0.115<\/td><td class=\"ts-num\">4.32<\/td><td class=\"ts-num\">0.170<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>177.8-203.2<\/td><td class=\"ts-num ts-w\">>7-8<\/td><td class=\"ts-num\">3.18<\/td><td class=\"ts-num\">0.125<\/td><td class=\"ts-num\">4.83<\/td><td class=\"ts-num\">0.190<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>203.2-228.6<\/td><td class=\"ts-num ts-w\">>8-9<\/td><td class=\"ts-num\">3.18<\/td><td class=\"ts-num\">0.125<\/td><td class=\"ts-num\">4.83<\/td><td class=\"ts-num\">0.190<\/td><\/tr>\n<tr><td class=\"ts-num ts-w\">>228.6-304.8<\/td><td class=\"ts-num ts-w\">>9-12<\/td><td class=\"ts-num\">3.18<\/td><td class=\"ts-num\">0.125<\/td><td class=\"ts-num\">4.83<\/td><td class=\"ts-num\">0.190<\/td><\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <ul class=\"ts-notes-list\">\n <li><sup>(a)<\/sup> Minimum allowance per side for machining prior to heat treatment. Maximum decarburization limit, 80% of machining allowance.<\/li>\n <\/ul>\n <div class=\"ts-disclaimer\">\n <h3>Table notes<\/h3>\n <p>Standard machining allowances for hot-rolled square and flat bars: the recommended total stock to remove from the as-supplied mill form to reach a surface free of scale, seams and other imperfections, and suitable for heat treatment and service.<\/p>\n <p>Bar weight for a given size, before any allowance is removed, is in the <a href=\"https:\/\/aobosteel.com\/steel-weight-calculator-for-round-bar-and-plate\/\">steel weight calculator for round bar and plate<\/a>.<\/p>\n <p>In addition to these standard allowances, extra stock must be provided for the cleanup of any decarburization or distortion that occurs during final heat treatment — the amount varies with the type of tool steel and the hardening treatment.<\/p>\n <p>Allowances for other shapes and other methods of forming and finishing are given in ASTM specifications A 600, A 681 and A 686.<\/p>\n <p>Metric and imperial allowance values are as printed in the source; the inch values are the standard figures (for example 0.025 in. ≈ 0.64 mm).<\/p>\n <\/div>\n <div class=\"ts-rel\">\n <h3>Related reference pages<\/h3>\n <p><a href=\"\/d2-tool-steel\/\">D2 tool steel<\/a> · <a href=\"\/o1-tool-steel\/\">O1 tool steel<\/a> · <a href=\"\/h13-tool-steel\/\">H13 tool steel<\/a> · <a href=\"\/tool-steel-machinability-rating-chart\/\">Tool steel machinability rating chart<\/a> · <a href=\"\/tool-steel-properties-chart\/\">Tool steel properties chart<\/a> · <a href=\"\/tool-steel-density-thermal-expansion\/\">Tool steel density and thermal expansion<\/a><\/p>\n <\/div>\n <p class=\"ts-source\">Source: ASM Handbook, Volume 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys, Table 17 “Standard machining allowances for hot-rolled square and flat bars” (10th ed., pp. 1833–1836). Reference data for comparison — verify the applicable heat treatment before design use.<\/p>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>Tool Steel Machining Allowances Chart – Hot-Rolled Square and Flat Bars | Aobo Steel Tool Steel Reference Data Tool Steel Machining Allowances Chart Standard machining allowances for hot-rolled tool steel square and flat bars: how much stock to remove from the top, bottom and edge surfaces of the as-supplied mill form, by specified bar thickness […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-18274","page","type-page","status-publish","hentry"],"yoast_head":"\n<title>Tool Steel Machining Allowance Chart - 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