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    <title>DieSupplies.com - Ground Flat Stock / O-1 Ground Flat Stock / All Products</title>
    <copyright>Copyright 2026, DieSupplies.com</copyright>
    <description>&lt;img src="//cdn.nexternal.com/toolanddie/images/O-1_GFS-cat.t.gif " style="float:left;width:90px; height:90px; margin-right:5px; " /&gt;&lt;p align="justify"&gt;O-1 Ground Flat Stock is likely the most popular grade. There are many standard sizes and it is relatively easy to heat treat. It comes annealed and ready for layout and machining. It can be used for making punches, dies, form tools, cams, bushings, guides or gauges. Practically every standard size of O-1 Ground Flat Stock manufactured in North America is listed here. Please contact us if you can't find the size you need.</description>
    <link>https://store.diesupplies.com/o-1-ground-flat-stock-c61all.aspx</link>
    <pubDate>Tue, 22 Sep 2026 14:41:05 GMT</pubDate>
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      <link>https://store.diesupplies.com/o1-precision-ground-flat-stock-oil-hardening-tool-steel-presco-pm-metric-p98.aspx</link>
      <guid isPermaLink="false">Product98</guid>
      <pubDate>Sat, 23 Nov 2013 19:51:00 GMT</pubDate>
      <title>O1 Precision Ground Flat Stock, Oil Hardening Tool Steel Presco PM, Metric</title>
      <description>&lt;div style="float:left"&gt;&lt;a class="url" href="https://store.diesupplies.com/o1-precision-ground-flat-stock-oil-hardening-tool-steel-presco-pm-metric-p98.aspx"&gt;&lt;img src="//cdn.nexternal.com/toolanddie/images/O1-MREG-PM.t.gif"  alt="O1 Precision Ground Flat Stock, Oil Hardening Tool Steel Presco PM, Metric" border="0" hspace="3"&gt;&lt;/a&gt;&lt;/div&gt;&lt;span class="riRssTitle"&gt;&lt;a href="https://store.diesupplies.com/o1-precision-ground-flat-stock-oil-hardening-tool-steel-presco-pm-metric-p98.aspx"&gt;O1 Precision Ground Flat Stock, Oil Hardening Tool Steel Presco PM, Metric&lt;/a&gt;&lt;/span&gt;&lt;br&gt;&lt;a href="https://store.diesupplies.com/o1-precision-ground-flat-stock-oil-hardening-tool-steel-presco-pm-metric-p98.aspx"&gt;Buy Now:&lt;/a&gt; &lt;span color="#990000"&gt;&lt;b&gt;$61.43&lt;/b&gt;&lt;/span&gt; &lt;br /&gt;&lt;br /&gt;&lt;div&gt;&lt;b&gt;TO BUY ONLINE:&lt;/b&gt;&lt;ol&gt;&lt;li&gt;Select a &lt;b&gt;Size |T x W x L|&lt;/b&gt; in the menu above.&lt;li&gt;Enter the quantity you need in the text box.&lt;li&gt;Click Add To Cart.&lt;/li&gt;&lt;/li&gt;&lt;/li&gt;&lt;/ol&gt;&lt;p align="justify"&gt;EXTRA DISCOUNTS: Purchase this item by itself or with any other items from &lt;a href="-c41.aspx"&gt;Precision Marshall's category&lt;/a&gt; to receive an extra discount based on the total value of category products in your Shopping Cart. Click the link for more information.&lt;br /&gt;&lt;br /&gt;This Presco Oil-Hardening Regular Tolerance Precision Tolerance Ground Flat Stock (Gauge Stock) is made by Precision Marshall Steel Company. The steel type is AISI O-1 tool steel, annealed for easier machining. It is an electric furnace melt oil-hardening tool steel with a fully spheroidized structure. A non-shrinking general-purpose tool steel, it has excellent abrasion resistance, toughness and machinability characteristics.&lt;br /&gt;&lt;br /&gt;The standard nominal sizes are ground to a satin finish on four sides, free of decarburization, held to tight tolerances in dimensions and squareness, and ready for layout. Each piece is lightly coated with rust-preventive oil and individually packaged in a vapor-resistant envelope which has the size and steel type clearly marked. All ends are precisely cut and deburred to insure excellent yields and handling safety. At least one end is painted green for easier identification of the steel type.&lt;br /&gt;&lt;br /&gt;Thicknesses 5mm and up are cold-sawn, while lighter sections are sheared.&lt;br /&gt;&lt;br /&gt;The Thickness |T| tolerance is +.05mm/-.00mm. The Width |W| tolerance is +.02mm/-.00mm. The Length |L| tolerance is +5mm/+8mm.&lt;br /&gt;&lt;br /&gt;The available thicknesses are 3 to 10mm. The available widths are 15 to 150mm. Please contact us if you need a different size, or if you need us to make any alterations.&lt;br /&gt;&lt;br /&gt;RELATED:&lt;br /&gt;&lt;a href="-p97.aspx"&gt;PM Precision GFS, Presco O1 Ground Tool Steel, Fractional Inch Sizes&lt;/a&gt;&lt;br /&gt;&lt;a href="-p96.aspx"&gt;PM Oversize GFS, Presco O1 Ground Tool Steel, Fractional Inch Sizes &lt;/a&gt;&lt;br /&gt;&lt;br /&gt;DELIVERY TIME: Normally in stock and ships the next business day.&lt;br /&gt;&lt;br /&gt;SHIPS FROM: Precision Marshall products are sent directly to you from the warehouses in Bolingbrook, IL; Hartford, CT; Euless, TX; or Santa Fe Springs, CA.&lt;br /&gt;&lt;br /&gt;MINIMUM ORDER: None. &lt;br /&gt;&lt;br /&gt;HEAT TREATMENT: For sections smaller than 6mm, heat to 1450-1475°F and hold until heated through. For larger sections, preheat to 1200°F, then raise to 1450-1500°F hardening temperature. Hold one-half hour per 25mm of cross section. Quench in oil at 125-150°F and TEMPER IMMEDIATELY.&lt;br /&gt;&lt;br /&gt;TEMPERING DATA:&lt;table&gt;&lt;tr&gt;&lt;td&gt;Temper °F&lt;/td&gt;&lt;td&gt;Rockwell C Hardness&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;As Quenched&lt;/td&gt;&lt;td&gt;63-65&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;300&lt;/td&gt;&lt;td&gt;63-65&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;400&lt;/td&gt;&lt;td&gt;61-64&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;500&lt;/td&gt;&lt;td&gt;60-63&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;600&lt;/td&gt;&lt;td&gt;57-60&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;800&lt;/td&gt;&lt;td&gt;48-51&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;1000&lt;/td&gt;&lt;td&gt;44-48&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/p&gt;&lt;br /&gt;&lt;br /&gt;Visit &lt;a href="https://store.diesupplies.com/o-1-ground-flat-stock-c61all.aspx"&gt;O-1 Ground Flat Stock&lt;/a&gt; to see additional products in this category.&lt;/div&gt;</description>
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      <link>https://store.diesupplies.com/o1-oversize-ground-flat-stock-oil-hardening-tool-steel-presco-pm-p96.aspx</link>
      <guid isPermaLink="false">Product96</guid>
      <pubDate>Sat, 23 Nov 2013 10:43:00 GMT</pubDate>
      <title>O1 Oversize Ground Flat Stock, Oil Hardening Tool Steel Presco PM</title>
      <description>&lt;div style="float:left"&gt;&lt;a class="url" href="https://store.diesupplies.com/o1-oversize-ground-flat-stock-oil-hardening-tool-steel-presco-pm-p96.aspx"&gt;&lt;img src="//cdn.nexternal.com/toolanddie/images/O1-OVS-PM.t.gif"  alt="O1 Oversize Ground Flat Stock, Oil Hardening Tool Steel Presco PM" border="0" hspace="3"&gt;&lt;/a&gt;&lt;/div&gt;&lt;span class="riRssTitle"&gt;&lt;a href="https://store.diesupplies.com/o1-oversize-ground-flat-stock-oil-hardening-tool-steel-presco-pm-p96.aspx"&gt;O1 Oversize Ground Flat Stock, Oil Hardening Tool Steel Presco PM&lt;/a&gt;&lt;/span&gt;&lt;br&gt;&lt;a href="https://store.diesupplies.com/o1-oversize-ground-flat-stock-oil-hardening-tool-steel-presco-pm-p96.aspx"&gt;Buy Now:&lt;/a&gt; &lt;span color="#990000"&gt;&lt;b&gt;$15.11&lt;/b&gt;&lt;/span&gt; &lt;br /&gt;&lt;br /&gt;&lt;div&gt;&lt;b&gt;TO BUY ONLINE:&lt;/b&gt;&lt;ol&gt;&lt;li&gt;Select a &lt;b&gt;Size |T x W|&lt;/b&gt; and a &lt;b&gt;Length |L|&lt;/b&gt; in the menus above.&lt;li&gt;Enter the quantity you need in the text box.&lt;li&gt;Click Add To Cart.&lt;/li&gt;&lt;/li&gt;&lt;/li&gt;&lt;/ol&gt;&lt;p align="justify"&gt;EXTRA DISCOUNTS: Purchase this item by itself or with any other items from &lt;a href="-c41.aspx"&gt;Precision Marshall's category&lt;/a&gt; to receive an extra discount based on the total value of category products in your Shopping Cart. Click the link for more information.&lt;br /&gt;&lt;br /&gt;This Presco Oil-Hardening Oversize Tolerance Ground Flat Stock is made by Precision Marshall Steel Company. The steel type is AISI O-1 tool steel, annealed for easier machining. It is an electric furnace melt oil-hardening tool steel with a fully spheroidized structure. A non-shrinking general-purpose tool steel, it has excellent abrasion resistance, toughness and machinability characteristics.&lt;br /&gt;&lt;br /&gt;The standard nominal sizes are ground to a satin finish on four sides, free of decarburization, held to tight tolerances in dimensions and squareness, and ready for layout. Each piece is lightly coated with rust-preventive oil and individually packaged in a vapor-resistant envelope which has the size and steel type clearly marked. All ends are precisely cut and deburred to insure excellent yields and handling safety. Thicknesses 3/16" and up are cold-sawn, while lighter sections are sheared. At least one end is painted green  for easier identification of the steel type.&lt;br /&gt;&lt;br /&gt;The oversize Thickness |T| tolerance is +.010/+.015". The oversize Width |W| tolerance is +.010/+.015". The 18" Length |L| tolerance is +.125/.250". The 36" Length |L| is tolerance +.250/.500".&lt;br /&gt;&lt;br /&gt;The available thicknesses are 1/8 to 1 inches. The available widths are 3/16 to 8 inches. Please contact us if you need a different size, or if you need us to make any alterations.&lt;br /&gt;&lt;br /&gt;RELATED:&lt;br /&gt;&lt;a href="-p97.aspx"&gt;PM Precision GFS, Presco O1 Ground Tool Steel, Fractional Inch Sizes&lt;/a&gt;&lt;br /&gt;&lt;a href="-p98.aspx"&gt;PM Precision GFS, Presco O1 Ground Tool Steel, Metric Sizes&lt;/a&gt;&lt;br /&gt;&lt;br /&gt;DELIVERY TIME: Normally in stock and ships the next business day.&lt;br /&gt;&lt;br /&gt;SHIPS FROM: Precision Marshall products are sent directly to you from the warehouses in Bolingbrook, IL; Hartford, CT; Euless, TX; or Santa Fe Springs, CA.&lt;br /&gt;&lt;br /&gt;MINIMUM ORDER: None.&lt;br /&gt;&lt;br /&gt;HEAT TREATMENT: For sections smaller than 1/4", heat to 1450-1475°F and hold until heated through. For larger sections, preheat to 1200°F, then raise to 1450-1500°F hardening temperature. Hold one-half hour per inch of cross section. Quench in oil at 125-150°F and TEMPER IMMEDIATELY.&lt;br /&gt;&lt;br /&gt;TEMPERING DATA:&lt;table&gt;&lt;tr&gt;&lt;td&gt;Temper °F&lt;/td&gt;&lt;td&gt;Rockwell C Hardness&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;As Quenched&lt;/td&gt;&lt;td&gt;63-65&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;300&lt;/td&gt;&lt;td&gt;63-65&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;400&lt;/td&gt;&lt;td&gt;61-64&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;500&lt;/td&gt;&lt;td&gt;60-63&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;600&lt;/td&gt;&lt;td&gt;57-60&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;800&lt;/td&gt;&lt;td&gt;48-51&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;1000&lt;/td&gt;&lt;td&gt;44-48&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/p&gt;&lt;br /&gt;&lt;br /&gt;Visit &lt;a href="https://store.diesupplies.com/o-1-ground-flat-stock-c61all.aspx"&gt;O-1 Ground Flat Stock&lt;/a&gt; to see additional products in this category.&lt;/div&gt;</description>
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      <link>https://store.diesupplies.com/o1-precision-ground-flat-stock-oil-hardening-tool-steel-presco-pm-p97.aspx</link>
      <guid isPermaLink="false">Product97</guid>
      <pubDate>Sat, 23 Nov 2013 10:43:00 GMT</pubDate>
      <title>O1 Precision Ground Flat Stock, Oil Hardening Tool Steel Presco PM</title>
      <description>&lt;div style="float:left"&gt;&lt;a class="url" href="https://store.diesupplies.com/o1-precision-ground-flat-stock-oil-hardening-tool-steel-presco-pm-p97.aspx"&gt;&lt;img src="//cdn.nexternal.com/toolanddie/images/O1-REG-PM.t.gif"  alt="O1 Precision Ground Flat Stock, Oil Hardening Tool Steel Presco PM" border="0" hspace="3"&gt;&lt;/a&gt;&lt;/div&gt;&lt;span class="riRssTitle"&gt;&lt;a href="https://store.diesupplies.com/o1-precision-ground-flat-stock-oil-hardening-tool-steel-presco-pm-p97.aspx"&gt;O1 Precision Ground Flat Stock, Oil Hardening Tool Steel Presco PM&lt;/a&gt;&lt;/span&gt;&lt;br&gt;&lt;a href="https://store.diesupplies.com/o1-precision-ground-flat-stock-oil-hardening-tool-steel-presco-pm-p97.aspx"&gt;Buy Now:&lt;/a&gt; &lt;span color="#990000"&gt;&lt;b&gt;$18.21&lt;/b&gt;&lt;/span&gt; &lt;br /&gt;&lt;br /&gt;&lt;div&gt;&lt;b&gt;TO BUY ONLINE:&lt;/b&gt;&lt;ol&gt;&lt;li&gt;Select a &lt;b&gt;Size |T x W|&lt;/b&gt; and a &lt;b&gt;Length |L|&lt;/b&gt; in the menus above.&lt;li&gt;Enter the quantity you need in the text box.&lt;li&gt;Click Add To Cart.&lt;/li&gt;&lt;/li&gt;&lt;/li&gt;&lt;/ol&gt;&lt;p align="justify"&gt;EXTRA DISCOUNTS: Purchase this item by itself or with any other items from &lt;a href="-c41.aspx"&gt;Precision Marshall's category&lt;/a&gt; to receive an extra discount based on the total value of category products in your Shopping Cart. Click the link for more information.&lt;br /&gt;&lt;br /&gt;This Presco Oil-Hardening Regular Tolerance Precision Tolerance Ground Flat Stock (Gauge Stock) is made by Precision Marshall Steel Company. The steel type is AISI O-1 tool steel, annealed for easier machining. It is an electric furnace melt oil-hardening tool steel with a fully spheroidized structure. A non-shrinking general-purpose tool steel, it has excellent abrasion resistance, toughness and machinability characteristics.&lt;br /&gt;&lt;br /&gt;The standard nominal sizes are ground to a satin finish on four sides, free of decarburization, held to tight tolerances in dimensions and squareness, and ready for layout. Each piece is lightly coated with rust-preventive oil and individually packaged in a vapor-resistant envelope which has the size and steel type clearly marked. All ends are precisely cut and deburred to insure excellent yields and handling safety. Thicknesses 3/16" and up are cold-sawn, while lighter sections are sheared. At least one end is painted green for easier identification of the steel type.&lt;br /&gt;&lt;br /&gt;The Thickness |T| tolerance is ±.001". The Width |W| tolerance is +.000/.005, when W &gt; T and the profile is rectangular. When W=T the profile is square and the width tolerance is ±.001". The 18" Length |L| tolerance is +.125/.250". The 36" Length |L| tolerance is +.250/.500".&lt;br /&gt;&lt;br /&gt;The available thicknesses are 1/64 to 2-1/2 inches. The available widths are 1/8 to 14 inches. Please contact us if you need a different size, or if you need us to make any alterations.&lt;br /&gt;&lt;br /&gt;RELATED:&lt;br /&gt;&lt;a href="-p96.aspx"&gt;PM Oversize GFS, Presco O1 Ground Tool Steel, Fractional Inch Sizes&lt;/a&gt;&lt;br /&gt;&lt;a href="-p98.aspx"&gt;PM Precision GFS, Presco O1 Ground Tool Steel, Metric Sizes&lt;/a&gt;&lt;br /&gt;&lt;br /&gt;DELIVERY TIME: Normally in stock and ships the next business day.&lt;br /&gt;&lt;br /&gt;SHIPS FROM: Precision Marshall products are sent directly to you from the warehouses in Bolingbrook, IL; Hartford, CT; Euless, TX; or Santa Fe Springs, CA.&lt;br /&gt;&lt;br /&gt;MINIMUM ORDER: None.&lt;br /&gt;&lt;br /&gt;HEAT TREATMENT: For sections smaller than 1/4", heat to 1450-1475°F and hold until heated through. For larger sections, preheat to 1200°F, then raise to 1450-1500°F hardening temperature. Hold one-half hour per inch of cross section. Quench in oil at 125-150°F and TEMPER IMMEDIATELY.&lt;br /&gt;&lt;br /&gt;TEMPERING DATA:&lt;table&gt;&lt;tr&gt;&lt;td&gt;Temper °F&lt;/td&gt;&lt;td&gt;Rockwell C Hardness&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;As Quenched&lt;/td&gt;&lt;td&gt;63-65&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;300&lt;/td&gt;&lt;td&gt;63-65&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;400&lt;/td&gt;&lt;td&gt;61-64&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;500&lt;/td&gt;&lt;td&gt;60-63&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;600&lt;/td&gt;&lt;td&gt;57-60&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;800&lt;/td&gt;&lt;td&gt;48-51&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;1000&lt;/td&gt;&lt;td&gt;44-48&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/p&gt;&lt;br /&gt;&lt;br /&gt;Visit &lt;a href="https://store.diesupplies.com/o-1-ground-flat-stock-c61all.aspx"&gt;O-1 Ground Flat Stock&lt;/a&gt; to see additional products in this category.&lt;/div&gt;</description>
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