S7 Tool Steel Grade Shapes, Sizes, and Technical Information From Tool Steel Service Inc.

S7 Tool Steel is an air-hardening or oil hardening tool steel that is characterized by its shock resistance, excellent toughness, high compression strength, and medium wear resistance. The exceptional toughness and shock-resistant qualities of this steel makes it a great option for a variety of tooling applications. S7 is a versatile tool steel and can be used for cold or hot work applications. We stock S7 Tool Steel in a variety of shapes and sizes.

S7 Tool Steel Shapes, Sizes, and availability

Below is our stock sizes and availability for S7 Tool Steel. Special sizing, cutting, and grinding are available upon request.

Stock Sizes

S7 Decarb Free Rounds are available in 3/8" to 18" diameter.


Round Bars are supplied decarb free and sufficiently over-sized to finish to diameter ordered in sizes from 3/8” to 18” diameter. Drilling, boring, turning, cutting, and center-less grinding services available. Hollow Bar supplied in all O.D. sizes shown, with I.D. furnished to customer’s specifications.

S7 Tool Steel Grade Technical Specifications

Below is the technical specifications for our S7 Tool Steel.

Typical Analysis of S7 Tool Steel

Typical Analysis
C Mn Si Cr Mo
0.50% 0.70% 0.30% 3.25% 1.40%

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

General Characteristics of S7 Tool Steel

General Characteristics
An air-hardening tool steel, S7 is a good general purpose and shock resisting tool steel well suited for many tools requiring exceptional toughness, good wear and resistance and added dimensional stability. Typical applications include blanking and forming dies.

Typical applications of S7 Tool Steel

Typical Applications
Punches, blanking dies, plastic molds, chisels, shears, forming dies, hobbled dies.

Heat Treatment of S7 Tool Steel (In Fahrenheit )

Heat Treatment (degrees in Fahrenheit)
Forging Annealing Preheating Hardening Tempering
1800 to 2100 1500 to 1600   1725 to 1850 400 to 1150

Effects of tampering of S7 Tool Steel ( In Rockwell C ) In a table, Place the information here

Effects of Tempering (Measured in Rockwell C)
As hardened 400 °F 600 °F 800 °F 1000  °F
60 to 62 58 to 59 55 to 56 54 to 55 53 to 54

S7 Tool Steel Inventory

S7 Precision Ground Flat Stock Standard Tolerance Inventory
S7 Precision Ground Flat Stock Oversize Tolerance Inventory
S7 Drill Rod Inventory
S7 Decarb Free Rounds
S7 Decarb Free Plate


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