{"id":11464,"date":"2025-12-19T12:20:43","date_gmt":"2025-12-19T04:20:43","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=11464"},"modified":"2026-10-28T08:18:41","modified_gmt":"2026-10-28T00:18:41","slug":"tool-steel-selection-for-gages-precision-tools","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/tool-steel-selection-for-gages-precision-tools\/","title":{"rendered":"\uac8c\uc774\uc9c0 \ubc0f \uc815\ubc00 \uacf5\uad6c\uc6a9 \uacf5\uad6c\uac15 | A2, D2 \uc120\ud0dd \uac00\uc774\ub4dc (\uacf5\uae09\uc5c5\uccb4)"},"content":{"rendered":"

\uac8c\uc774\uc9c0 \ubc0f \uc815\ubc00 \uacf5\uad6c\uc6a9 \uacf5\uad6c\uac15 \uc120\uc815<\/h1>\n\n\n\n

\ud50c\ub7ec\uadf8 \uac8c\uc774\uc9c0, \ub9c1 \uac8c\uc774\uc9c0, \ub098\uc0ac \uac8c\uc774\uc9c0, \uac8c\uc774\uc9c0 \ube14\ub85d, \ub9c8\uc774\ud06c\ub85c\ubbf8\ud130 \uc564\ube4c\uacfc \uac19\uc740 \uac8c\uc774\uc9c0 \ubc0f \uc815\ubc00 \uce21\uc815 \ub3c4\uad6c\ub294 \uc0c1\uc628\uc5d0\uc11c \ubc18\ubcf5\uc801\uc778 \uc2ac\ub77c\uc774\ub529 \uc811\ucd09\uacfc \ucd5c\uc18c\ud55c\uc758 \ucda9\uaca9 \ud558\uc911\uc73c\ub85c \uc791\ub3d9\ud569\ub2c8\ub2e4. \uc774\ub7ec\ud55c \ub3c4\uad6c\uc5d0 \uc0ac\uc6a9\ub418\ub294 \ub4f1\uae09\uc740 \ub2e4\uc74c\uc5d0\uc11c \ube44\uad50\ub429\ub2c8\ub2e4. \uac8c\uc774\uc9c0 \ubc0f \uc815\ubc00 \ub3c4\uad6c \ub4f1\uae09 \uac00\uc774\ub4dc<\/a>.<\/p>\n\n\n\n

\uc8fc\ub41c \ud30c\uc190 \uba54\ucee4\ub2c8\uc998\uc740 \ub9c8\ubaa8\uc640 \uc811\ucc29 \ub9c8\ubaa8\uc785\ub2c8\ub2e4. \uc7ac\ub8cc \uc190\uc2e4\uc740 \uae30\uc900 \uce58\uc218\ub97c \uc9c1\uc811\uc801\uc73c\ub85c \ubcc0\ud654\uc2dc\ucf1c \uce21\uc815 \uc624\ucc28\ub97c \uc720\ubc1c\ud569\ub2c8\ub2e4. \ub530\ub77c\uc11c \uacf5\uad6c\uac15 \uc120\ud0dd\uc740 \uae30\uacc4\uc801 \ud558\uc911\uc5d0 \ub300\ud55c \uc800\ud56d\ub825\ubcf4\ub2e4\ub294 \uc7a5\uae30\uac04 \uc0ac\uc6a9 \uc2dc \uce58\uc218 \uc815\ud655\ub3c4\ub97c \uc720\uc9c0\ud558\ub294 \ub370 \uc911\uc810\uc744 \ub461\ub2c8\ub2e4.<\/p>\n\n\n\n

\uc120\ud0dd \uc694\uc778<\/h2>\n\n\n\n

\uce58\uc218 \uc548\uc815\uc131
<\/strong>\uc774\uac83\uc774 \uac00\uc7a5 \uc911\uc694\ud55c \uc694\uad6c \uc0ac\ud56d\uc785\ub2c8\ub2e4. \uc77c\ubd80 \uac15\uc7ac\ub294 \uacbd\ud654 \ud6c4 \uc0c1\uc628\uc5d0\uc11c \uc810\uc9c4\uc801\uc778 \ubbf8\uc138 \uad6c\uc870 \ubcc0\ud654\ub97c \uacaa\uc73c\uba70, \uc774\ub85c \uc778\ud574 \uc2dc\uac04\uc774 \uc9c0\ub0a8\uc5d0 \ub530\ub77c \ud06c\uae30 \ubcc0\ud654\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc120\ud0dd\ub41c \uac15\uc7ac\ub294 \uc5f4\ucc98\ub9ac \uc911 \ubcc0\ud615\uc744 \ucd5c\uc18c\ud654\ud558\uace0 \uc0ac\uc6a9 \uae30\uac04 \ub0b4\ub0b4 \uc548\uc815\uc801\uc778 \uce58\uc218\ub97c \uc720\uc9c0\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

\ub0b4\ub9c8\ubaa8\uc131
<\/strong>\uacf5\uc791\ubb3c\uacfc\uc758 \ubc18\ubcf5\uc801\uc778 \uc811\ucd09\uc740 \uc810\uc9c4\uc801\uc778 \uc7ac\ub8cc \uc81c\uac70\ub97c \ucd08\ub798\ud569\ub2c8\ub2e4. \ub9c8\ubaa8\uc728\uc744 \uc904\uc774\uace0 \uce21\uc815 \uc815\ud655\ub3c4\ub97c \uc720\uc9c0\ud558\ub824\uba74 \ub192\uc740 \uacbd\ub3c4\uc640 \uc548\uc815\uc801\uc778 \ud0c4\ud654\ubb3c \uad6c\uc870\uac00 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

\ud45c\uba74 \ubb34\uacb0\uc131
<\/strong>\uce21\uc815\uba74\uc740 \uc815\ubc00 \uc5f0\ub9c8 \ubc0f \ub798\ud551\uc5d0 \uc801\ud569\ud574\uc57c \ud569\ub2c8\ub2e4. \uc7ac\uc9c8\uc740 \ubc18\ubcf5 \uc0ac\uc6a9\uc5d0\ub3c4 \ubd88\uad6c\ud558\uace0 \uc5f4\ud654 \uc5c6\uc774 \ub9e4\ub044\ub7fd\uace0 \uc548\uc815\uc801\uc778 \ud45c\uba74\uc744 \uc720\uc9c0\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

\ucd94\ucc9c \uacf5\uad6c\uac15<\/h2>\n\n\n\n
\n\n

D\uc871(\uace0\ud0c4\uc18c, \uace0\ud06c\ub86c\uac15)<\/h3>\n\n\n

\uadf8\ub8f9 D \uac15, \ud2b9\ud788 D2 \uac15\uc740 \ub0b4\ub9c8\ubaa8\uc131\uc774 \uc81c\ud55c \uc694\uc18c\uc778 \ub300\ub7c9 \uacc4\uce21 \uc6a9\ub3c4\uc5d0 \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/p>\n\n\n

\ub192\uc740 \ud0c4\uc18c \ubc0f \ud06c\ub86c \ud568\ub7c9\uc73c\ub85c \uc778\ud574 \ud06c\ub86c\uc774 \ud48d\ubd80\ud55c \ud0c4\ud654\ubb3c\uc774 \ub2e4\ub7c9 \uc0dd\uc131\ub418\uc5b4 \ub0b4\ub9c8\ubaa8\uc131\uc774 \ud06c\uac8c \ud5a5\uc0c1\ub429\ub2c8\ub2e4. \ub530\ub77c\uc11c \uce21\uc815\uae30\ub294 \uc7a5\uae30\uac04 \uc0dd\uc0b0 \uacfc\uc815\uc5d0\uc11c\ub3c4 \uce58\uc218 \uc815\ud655\ub3c4\ub97c \uc720\uc9c0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n

\uce58\uc218 \uc548\uc815\uc131\uc740 \uc801\uc808\ud55c \uc5f4\ucc98\ub9ac\uc5d0 \ub2ec\ub824 \uc788\uc2b5\ub2c8\ub2e4. \uc81c\uc5b4\ub41c \ub2e4\uc911 \ud15c\ud37c\ub9c1\uc744 \ud1b5\ud574 \uce58\uc218 \ubcc0\ud654\ub97c \ucd5c\uc18c\ud654\ud560 \uc218 \uc788\uc9c0\ub9cc, \ubcc0\ud615 \uc81c\uc5b4\ub294 A2\ubcf4\ub2e4 \ub354 \uae4c\ub2e4\ub86d\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n

\n
\uc9c0\uae08 \ubc14\ub85c \ubb38\uc758\ud558\uc138\uc694<\/a><\/div>\n\n\n
D2 \uc790\uc7ac \uacf5\uae09 \uc0c1\uc138 \uc815\ubcf4\ub97c \ud655\uc778\ud558\uc138\uc694<\/a><\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n
\n\n

A\uad70 (\uacf5\uae30 \uacbd\ud654\ud615, \uc911\ud569\uae08\uac15)<\/h3>\n\n\n

\uacf5\uae30 \uacbd\ud654\uac15, \ud2b9\ud788 A2\uac15\uc740 \uc815\ubc00\ud55c \uce58\uc218 \uc81c\uc5b4\uac00 \uc694\uad6c\ub418\ub294 \ub9c8\uc2a4\ud130 \uac8c\uc774\uc9c0 \ubc0f \uc751\uc6a9 \ubd84\uc57c\uc5d0 \uc120\ud638\ub429\ub2c8\ub2e4.<\/p>\n\n\n

\uc774\ub7ec\ud55c \uc18c\uc7ac\uc758 \uac00\uc7a5 \ud070 \uc7a5\uc810\uc740 \uc5f4\ucc98\ub9ac \uacfc\uc815\uc5d0\uc11c \ubcc0\ud615\uc774 \ucd5c\uc18c\ud654\ub41c\ub2e4\ub294 \uac83\uc785\ub2c8\ub2e4. \uacf5\ub7ad\uc2dd \ub0c9\uac01\uc740 \ub0b4\ubd80 \uc751\ub825\uc744 \uac10\uc18c\uc2dc\ucf1c \ub354\uc6b1 \uc608\uce21 \uac00\ub2a5\ud55c \uce58\uc218 \uc815\ud655\ub3c4\ub97c \uc81c\uacf5\ud569\ub2c8\ub2e4.<\/p>\n\n\n

A2\ub294 \ub0b4\ub9c8\ubaa8\uc131\uacfc \uc778\uc131\uc774 \uade0\ud615 \uc788\uac8c \uacb0\ud569\ub418\uc5b4 \uce58\uc218 \uc548\uc815\uc131\uc774 \uac00\uc7a5 \uc911\uc694\ud55c \uace0\ub824 \uc0ac\ud56d\uc77c \ub54c \uc2e0\ub8b0\ud560 \uc218 \uc788\ub294 \uc120\ud0dd\uc785\ub2c8\ub2e4.<\/p>\n\n\n

\n
\uc9c0\uae08 \ubc14\ub85c \ubb38\uc758\ud558\uc138\uc694<\/a><\/div>\n\n\n
A2 \uc790\uc7ac \uacf5\uae09 \uc0c1\uc138 \uc815\ubcf4\ub97c \ud655\uc778\ud558\uc138\uc694<\/a><\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n
\n\n

O1 \ubc0f O2 (\uc720\uacbd\ud654 \ub0c9\uac04\uac00\uacf5\uac15)<\/h3>\n\n\n

O1\uacfc O2\ub294 \ub098\uc0ac \uac8c\uc774\uc9c0 \ubc0f \ub9c8\uc774\ud06c\ub85c\ubbf8\ud130 \uc564\ube4c\uacfc \uac19\uc740 \uc77c\ubc18\uc801\uc778 \uc815\ubc00 \uacf5\uad6c\uc5d0 \ub110\ub9ac \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/p>\n\n\n

\uc774 \uc18c\uc7ac\uc758 \uac00\uc7a5 \ud070 \uc7a5\uc810\uc740 \uc218\uacbd\ud654\uac15\uc5d0 \ube44\ud574 \uacbd\ud654 \uacfc\uc815\uc5d0\uc11c \ubcc0\ud615\uc774 \uc801\uc5b4 \uc0dd\uc0b0 \uad00\ub9ac\uac00 \uc6a9\uc774\ud558\ub2e4\ub294 \uc810\uc785\ub2c8\ub2e4. \ub610\ud55c \ub0b4\ub9c8\ubaa8\uc131\uacfc \uce58\uc218 \uc548\uc815\uc131 \uc0ac\uc774\uc5d0\uc11c \uc801\uc808\ud55c \uade0\ud615\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4.<\/p>\n\n\n

O1\uc740 \uacbd\uc9c8 \ud06c\ub86c \ub3c4\uae08\uacfc \uacb0\ud569\ub420 \uacbd\uc6b0 \ud50c\ub7ec\uadf8 \uac8c\uc774\uc9c0\uc5d0 \ud2b9\ud788 \uc801\ud569\ud558\uba70, \ub9c8\ubaa8\uac00 \uc2ec\ud55c \ud658\uacbd\uc5d0\uc11c \uc218\uba85\uc744 \ud06c\uac8c \uc5f0\uc7a5\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n

\n
\uc9c0\uae08 \ubc14\ub85c \ubb38\uc758\ud558\uc138\uc694<\/a><\/div>\n\n\n
O1\/O2 \uc790\uc7ac \uacf5\uae09 \uc0c1\uc138 \uc815\ubcf4\ub97c \ud655\uc778\ud558\uc138\uc694.<\/a><\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n
\n\n

W1 (\uc218\uacbd\ud654 \uacf5\uad6c\uac15)<\/h3>\n\n\n

W1\uc740 \ucd5c\ub300 \uacbd\ub3c4(\uc77c\ubc18\uc801\uc73c\ub85c 65~66 HRC)\uac00 \uc694\uad6c\ub418\ub294 \uace0\uc815\ubc00 \uac8c\uc774\uc9c0 \ube14\ub85d\uc5d0 \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/p>\n\n\n

W1\uc758 \ud55c\uacc4\ub294 \uce58\uc218 \uc548\uc815\uc131\uc778\ub370, \uc774\ub294 \uc5f4\ucc98\ub9ac \uc81c\uc5b4\uc5d0 \ud06c\uac8c \uc88c\uc6b0\ub429\ub2c8\ub2e4. \uc548\uc815\uc801\uc778 \uc131\ub2a5\uc744 \uc5bb\uae30 \uc704\ud574\uc11c\ub294 W1\uc744 \ub2f4\uae08\uc9c8\ud55c \ud6c4 \uadf9\uc800\uc628 \ucc98\ub9ac \ubc0f \uc800\uc628 \ud15c\ud37c\ub9c1\uc744 \ud1b5\ud574 \uc794\ub958 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ub97c \uc904\uc5ec\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n

W1\uc740 \uc5c4\uaca9\ud55c \uc5f4\ucc98\ub9ac \uc81c\uc5b4\uac00 \uac00\ub2a5\ud55c \ucd08\uace0\uacbd\ub3c4 \uc694\uad6c \uc751\uc6a9 \ubd84\uc57c\uc5d0 \uc801\ud569\ud569\ub2c8\ub2e4.<\/p>\n\n<\/div>\n\n\n\n

\uc694\uc57d\ud45c<\/h2>\n\n\n\n
\uacf5\uad6c\uac15 \ub4f1\uae09<\/th>\uc8fc\uc694 \uc18d\uc131<\/th>\uacc4\uce21\uae30\uc758 \uc8fc\uc694 \uc774\uc810<\/th><\/tr><\/thead>
W1<\/td>65~66 HRC<\/td>\ucd5c\ub300 \uacbd\ub3c4; \uc81c\uc5b4\ub41c \uc5f4\ucc98\ub9ac\ub97c \uac70\uce58\ub294 \uac8c\uc774\uc9c0 \ube14\ub85d\uc5d0 \uc801\ud569\ud569\ub2c8\ub2e4.<\/td><\/tr>
O1 & O2<\/td>\uc800\uc65c\uace1<\/td>\ubbff\uc744 \uc218 \uc788\ub294 \ubc94\uc6a9 \uc120\ud0dd\uc9c0\uc774\uba70, \uc548\uc815\uc801\uc774\uace0 \ucc98\ub9ac\ud558\uae30 \uc27d\uc2b5\ub2c8\ub2e4.<\/td><\/tr>
A \uadf8\ub8f9 (A2)<\/td>\uacf5\uae30 \uacbd\ud654<\/td>\uce58\uc218 \uc548\uc815\uc131\uc774 \uac00\uc7a5 \uc6b0\uc218\ud558\uba70, \ub9c8\uc2a4\ud130 \uac8c\uc774\uc9c0\uc5d0 \uc801\ud569\ud569\ub2c8\ub2e4.<\/td><\/tr>
\uadf8\ub8f9 D (D2)<\/td>\ub192\uc740 \ud0c4\ud654\ubb3c \ud568\ub7c9<\/td>\ub300\ub7c9 \uc0ac\uc6a9\uc5d0 \uc801\ud569\ud55c \ucd5c\uc0c1\uc758 \ub0b4\ub9c8\ubaa8\uc131<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\uc2e4\uc9c8\uc801\uc778 \uc120\ud0dd \uac00\uc774\ub4dc<\/h2>\n\n\n\n

\uc2e4\uc81c\ub85c \uc120\ud0dd\uc740 \uac00\uc7a5 \uc911\uc694\ud55c \uc694\uad6c \uc0ac\ud56d\uc5d0 \ub530\ub77c \uacb0\uc815\ub429\ub2c8\ub2e4.<\/p>\n\n\n\n

\uc77c\ubc18\uc801\uc778 \uc815\ubc00 \uacf5\uad6c\uc758 \uacbd\uc6b0, O1\uacfc O2\ub294 \uc2e4\uc6a9\uc801\uc774\uace0 \uc548\uc815\uc801\uc778 \uc194\ub8e8\uc158\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

    \n
  • \uce58\uc218 \uc548\uc815\uc131\uc774 \ub9e4\uc6b0 \uc911\uc694\ud55c \uacbd\uc6b0, \ud2b9\ud788 \ub9c8\uc2a4\ud130 \uac8c\uc774\uc9c0\uc758 \uacbd\uc6b0 A2 \uac15\uc7ac\uac00 \uc77c\ubc18\uc801\uc73c\ub85c \uc120\ud638\ub429\ub2c8\ub2e4.<\/li>\n\n
  • \ub300\ub7c9 \uc0ac\uc6a9 \ud658\uacbd\uc5d0\uc11c \ub0b4\ub9c8\ubaa8\uc131\uacfc \uc218\uba85\uc774 \uac00\uc7a5 \uc911\uc694\ud55c \uace0\ub824 \uc0ac\ud56d\uc774\ub77c\uba74 D2\uac00 \ub354 \ub098\uc740 \uc120\ud0dd\uc785\ub2c8\ub2e4.<\/li>\n\n
  • \ucd5c\ub300 \uacbd\ub3c4\uac00 \uc694\uad6c\ub418\uace0 \uc5f4\ucc98\ub9ac \uacfc\uc815\uc744 \uc5c4\uaca9\ud558\uac8c \uc81c\uc5b4\ud560 \uc218 \uc788\ub294 \uacbd\uc6b0\uc5d0\ub294 W1\uc774 \uc5ec\uc804\ud788 \uc801\uc6a9 \uac00\ub2a5\ud569\ub2c8\ub2e4.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

    Selection of Tool Steel for Gages & Precision Tools Gages and precision measuring tools\u2014such as plug, ring, and thread gages, gage blocks, and micrometer anvils\u2014operate at room temperature with repeated sliding contact and minimal impact loading. The grades used for those tools are compared in the gages and precision tools grade guide. The dominant failure […]<\/p>\n","protected":false},"author":1,"featured_media":5700,"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":"normal-width-container","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":"disabled","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-11464","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"\nTool Steel for Gages & Precision Tools | A2, D2 Selection Guide Supplier<\/title>\n<meta name=\"description\" content=\"Learn how to select tool steel for gages and precision tools. Compare A2, D2, O1, and W1 based on wear resistance and dimensional stability. Bulk supply available.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aobosteel.com\/ko\/tool-steel-selection-for-gages-precision-tools\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tool Steel for Gages & Precision Tools | A2, D2 Selection Guide Supplier\" \/>\n<meta property=\"og:description\" content=\"Learn how to select tool steel for gages and precision tools. Compare A2, D2, O1, and W1 based on wear resistance and dimensional stability. 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