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Tool Steel Square Bar O1 offers excellent dimensional stability during heat treatment, and otherwise decent attributes. O1 is an oil-hardening, general purpose tool steel. While not as strong or wear resistant as A-2 or D-2, it experiences significantly less distortion during the heat treating process. It is typically used in rolls, punches, shear knives, food processing knives, and gauges.

shape Image

Dimension Name


Alloy O1
Height 0.1875
Max Length 36
Eniteo Vendor ID 1554
MTR Availability Yes
Material Tool Steel
Shape Bar-Square
Custom Cut Warehouse 0
Material Specifications

This material meets the following specs: ASTM -A681, SAE -J-437, FED -QQ-T-570

Weight/Lineal Foot

0.12 pounds
Please note that this data is to be used ONLY FOR REFERENCE, NOT FOR DESIGN, and by using it,you agree that any decisions you make regarding materials for your project are at your own discretion.

Mechanical Properties

Property Value
Brinell hardness  177 - 212
Rockwell Hardness B scale 88 - 95
Density g/cm^3 8
Elongation Typical % 20
Modulus of Elasticity KSI x 10^3 27
Melting Point °F 2580 - 2660
Specific Heat BTU/lb-°F (32-212F) 0 min
Thermal conductivity BTU-in/hr-ft^2-°F 300
Ultimate KSI 93
Yield KSI 58
Ultimate shear strength KSI 58

Chemistry Information: O1 Tool Steel

Element Percentage
C 0.94
Fe 96.56
Cr 0.5
Mn 1.2
Si 0.3
W 0.5
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