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Tool Steel Rectangle Bar O1

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14-08-2025 - tool steel bar-rectangle o1 - 1000x1000superZoom-main

Tool Steel Rectangle Bar O1

Tool Steel Rectangle/Flat Bar O1 is an oil-hardening, general purpose tool steel that holds its size and shape with excellent accuracy when being heat treated. While not as strong or wear resistant as A-2 or D-2, it experiences significantly less distortion during the heat-treating process. O1 tool steel has deep hardening properties and fine grain structure with unusual toughness. 

 

We carry Ground Oversized O1 & Precision Ground O1 rectangle bar.

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Material Properties

Link Icon Tool Steel O1 Product Guide | Link Icon Tool Steel O1 Rectangle Bar Tolerances

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3/8" x 2" Tool Steel Rectangle Bar O1 Precision Ground Part # 12143

3/8" x 2" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12143
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$129.57 for 1
$129.57 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 2"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
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tool-steel-rectangle-bar-o1-1superZoom-desk12143

3/8" x 2 1/2" Tool Steel Rectangle Bar O1 Precision Ground Part # 12144

3/8" x 2 1/2" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12144
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$152.63 for 1
$152.63 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 2.5"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
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tool-steel-rectangle-bar-o1-1superZoom-desk12144

3/8" x 1 1/2" Tool Steel Rectangle Bar O1 Precision Ground Part # 12141

3/8" x 1 1/2" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12141
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$106.40 for 1
$106.40 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 1.5"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
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tool-steel-rectangle-bar-o1-1superZoom-desk12141

3/8" x 3" Tool Steel Rectangle Bar O1 Precision Ground Part # 12145

3/8" x 3" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12145
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$175.88 for 1
$175.88 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 3"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
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tool-steel-rectangle-bar-o1-1superZoom-desk12145

3/8" x 3 1/2" Tool Steel Rectangle Bar O1 Precision Ground Part # 12146

3/8" x 3 1/2" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12146
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$199.05 for 1
$199.05 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 3.5"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12146

3/8" x 4" Tool Steel Rectangle Bar O1 Precision Ground Part # 12147

3/8" x 4" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12147
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$222.25 for 1
$222.25 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 4"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12147

3/8" x 4 1/2" Tool Steel Rectangle Bar O1 Precision Ground Part # 12148

3/8" x 4 1/2" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12148
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$245.28 for 1
$245.28 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 4.5"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12148

3/8" x 5" Tool Steel Rectangle Bar O1 Precision Ground Part # 12149

3/8" x 5" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12149
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$268.40 for 1
$268.40 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 5"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12149

3/8" x 5 1/2" Tool Steel Rectangle Bar O1 Precision Ground Part # 12150

3/8" x 5 1/2" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12150
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$291.63 for 1
$291.63 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 5.5"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12150

3/8" x 6" Tool Steel Rectangle Bar O1 Precision Ground Part # 12151

3/8" x 6" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12151
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$314.75 for 1
$314.75 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 6"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12151

3/8" x 7" Tool Steel Rectangle Bar O1 Precision Ground Part # 12152

3/8" x 7" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12152
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$412.70 for 1
$412.70 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 7"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12152

3/8" x 8" Tool Steel Rectangle Bar O1 Precision Ground Part # 12153

3/8" x 8" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12153
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$466.28 for 1
$466.28 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 8"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12153

3/8" x 10" Tool Steel Rectangle Bar O1 Precision Ground Part # 12154

3/8" x 10" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12154
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$572.45 for 1
$572.45 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 10"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12154

3/8" x 12" Tool Steel Rectangle Bar O1 Precision Ground Part # 12155

3/8" x 12" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12155
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$679.10 for 1
$679.10 ea.

Dimensions

  • Thickness: 0.375"
  • Width: 12"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12155

7/16" x 1/2" Tool Steel Rectangle Bar O1 Precision Ground Part # 12156

7/16" x 1/2" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12156
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$71.70 for 1
$71.70 ea.

Dimensions

  • Thickness: 0.4375"
  • Width: 0.5"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12156

7/16" x 1" Tool Steel Rectangle Bar O1 Precision Ground Part # 12158

7/16" x 1" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12158
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$98.15 for 1
$98.15 ea.

Dimensions

  • Thickness: 0.4375"
  • Width: 1"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12158

7/16" x 1 1/4" Tool Steel Rectangle Bar O1 Precision Ground Part # 12159

7/16" x 1 1/4" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12159
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$110.43 for 1
$110.43 ea.

Dimensions

  • Thickness: 0.4375"
  • Width: 1.25"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12159

7/16" x 1 1/2" Tool Steel Rectangle Bar O1 Precision Ground Part # 12160

7/16" x 1 1/2" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12160
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$123.65 for 1
$123.65 ea.

Dimensions

  • Thickness: 0.4375"
  • Width: 1.5"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12160

7/16" x 3/4" Tool Steel Rectangle Bar O1 Precision Ground Part # 12157

7/16" x 3/4" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12157
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$84.90 for 1
$84.90 ea.

Dimensions

  • Thickness: 0.4375"
  • Width: 0.75"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12157

7/16" x 2" Tool Steel Rectangle Bar O1 Precision Ground Part # 12161

7/16" x 2" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12161
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$150.13 for 1
$150.13 ea.

Dimensions

  • Thickness: 0.4375"
  • Width: 2"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12161

7/16" x 3" Tool Steel Rectangle Bar O1 Precision Ground Part # 12163

7/16" x 3" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12163
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$203.17 for 1
$203.17 ea.

Dimensions

  • Thickness: 0.4375"
  • Width: 3"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12163

7/16" x 6" Tool Steel Rectangle Bar O1 Precision Ground Part # 12165

7/16" x 6" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12165
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$362.33 for 1
$362.33 ea.

Dimensions

  • Thickness: 0.4375"
  • Width: 6"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12165

7/16" x 2 1/2" Tool Steel Rectangle Bar O1 Precision Ground Part # 12162

7/16" x 2 1/2" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12162
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$176.68 for 1
$176.68 ea.

Dimensions

  • Thickness: 0.4375"
  • Width: 2.5"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12162

7/16" x 4" Tool Steel Rectangle Bar O1 Precision Ground Part # 12164

7/16" x 4" Tool Steel Rectangle Bar O1 Precision Ground -
Part #: 12164
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$249.77 for 1
$249.77 ea.

Dimensions

  • Thickness: 0.4375"
  • Width: 4"
Click for more details
tool-steel-rectangle-bar-o1-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-1superZoom-desk12164

1/2" x 5/8" Tool Steel Rectangle Bar O1 Ground Oversize Part # 11478

1/2" x 5/8" Tool Steel Rectangle Bar O1 Ground Oversize -
Part #: 11478
Best shipping value:
Single Heat Lot Required
Why are heat lots important?
Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

QTY

Update
$84.80 for 1
$84.80 ea.

Dimensions

  • Thickness: 0.5"
  • Width: 0.625"
Click for more details
tool-steel-rectangle-bar-o1-oversize-1superZoom-mob{product.code}
Material Meets These Standard(s): ASTM-A681 , SAE-J-437

Key Features

MTR FREE MTR Available
View more product details View more product details
View more product details Click for more details
tool-steel-rectangle-bar-o1-oversize-1superZoom-desk11478

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