A2 Tool Steel Grade Shapes, Sizes, and Technical Information From Tool Steel Service Inc.

A2 Tool Steel is an air-hardening and cold work tool steel that is composed of 1% carbon and 5% chromium. A2 is characterized by its excellent versatility, non-deforming properties, toughness properties, and dimensional stability in heat treatment. A2 is intermediate in abrasion resistance between D2 high-carbon and O1 oil-hardening tool steel, high chromium tool steel. 

A2 Tool Steel Shapes and Sizes

Sizes and Availability: A2 Decarb Free Rounds are available in 5/16" to 24-1/2" diameter. Round Bars are supplied decarb free and sufficiently over-sized to finish to diameter ordered in sizes from 5/16” to 24-1/2” diameter. Drilling, boring, turning, cutting, and centerless grinding services available. Hollow Bar supplied in all O.D. sizes shown, with I.D. furnished to any specifications. Pre-Finished Flats and Squares supplied decarb free, ground top and bottom +0.15” / 0.35”, saw cut width +0.15” / 0.065”. Surfaced Finish 100RMS maximum. Surface grinding service available. Drill Rod and Ground Flat Stock available in a wide range of sizes. Foragings and Non-Standard Sizes available on special order.

A2 Tool Steel Grade Technical Specifications

Below is the technical specifications for our A2 Tool Steel.

Typical Analysis of A2 Tool Steel


Typical Analysis







1.00% 0.60% 0.30% 5.20% 0.30% 1.10%

C - Carbon, Mn - Maganese, Si - Silicon, Cr - Chromium, V - Vanadium, Mo - Molybdenum

General Characteristics of A2 Tool Steel

General Characteristics

Air-hardening tool steel offering outstanding stability during heat treatment. A2 has gained wide popularity in applications where a high risk of distortion or cracking exists. Substantially increased toughness and wearing properties improve die life significantly at a cost only slightly higher than that of basic oil-hardening grades. A2 is worthy of consideration in many applications where up grading from an oil-hardening grade is desired.


Typical applications of A2 Tool Steel

Typical Applications

Industrial Knives, Slitters, Trim Dies, Mold Inserts, Wear Parts, Shear Blades, Blanking Dies, Forming Dies, Fine-blanking Dies, 
Lamination Dies


Heat Treatment of A2 Tool Steel (In Fahrenheit )

Heat Treatment (degrees in Fahrenheit)






2100 to 1650

1550 to 1600

1450 to 1500

1750 to 1800

400 to 650


Effects of tampering of A2 Tool Steel ( In Rockwell C )

Effects of Tempering (Measured in Rockwell C)

As hardened

400 deg. F

600 deg. F

800 deg. F

1000 deg. F

63 to 65

60 to 62

58 to 60

57 to 59

56 to 58


A2 Tool Steel Inventory

A2 Precision Ground Flat Stock Standard Tolerance Inventory
A2 Precision Ground Flat Stock Oversize Tolerance Inventory
A2 Drill Rod Inventory
A2 Decarb Free Rounds Inventory
A2 Decarb Free Plate Inventory

Check our stock of the A2 Tool Steel Grade

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