S7 Tool Steel Round & Flat Bar
Arch Metals supplies S7 tool steel round and flat bar from Dallas, Texas, to tool and die shops and manufacturers across Texas and the surrounding states. S7 is a shock-resisting, air-hardening tool steel with outstanding impact toughness and good hardness. We supply annealed S7 to ASTM A681 with certified material and saw cutting to size. Request a quote and we’ll confirm sizes and availability.
S7 Tool Steel Forms
- Round bar, annealed
- Flat bar and plate, annealed
- Saw-cut blanks and blocks
Size availability changes with mill supply. Send us your sizes through our quote request form and we’ll confirm stock, lead time and pricing.
S7 Tool Steel Condition and Specifications
- Annealed bar (ASTM A681): supplied soft for machining, typically around 200 HB. Parts are hardened after machining.
- Heat treatment (Air or oil quench): S7 is usually air hardened, which keeps distortion low, and tempered to about 54–58 HRC for most tooling.
- Equivalent designations (UNS T41907)
Not sure which condition or specification your drawing calls for? Send us the print requirements and we’ll match the material.
Typical Properties of S7 Tool Steel
- Annealed hardness: about 187–223 HB
- Working hardness: about 54–58 HRC after hardening and tempering
- Impact toughness: among the highest of the tool steels
- Density: 0.283 lb/in³ (7.83 g/cm³)
- Chemistry: about 0.5% carbon, 3.25% chromium and 1.4% molybdenum
These are typical values for S7 tool steel. Guaranteed minimums vary by specification, condition and size, so check the governing spec or your mill cert for design values.
Why Toolmakers Choose S7 Tool Steel
S7 is the go-to tool steel when a part has to take repeated impact without chipping or cracking. Air hardening means less distortion than oil-hardening shock steels, and it holds up well in moderate hot-work applications. For better wear resistance at lower impact, compare it with A3 tool steel or D7 tool steel. Common uses for S7 include:
- Punches, chisels and shear blades
- Rivet sets and forming tools
- Plastic mold components
- Hot and cold heading tools
S7 Tool Steel FAQs
What does the S in S7 stand for?
S stands for shock-resisting. S-series tool steels are designed for toughness under repeated impact.
What hardness should S7 be used at?
Most S7 tooling runs at about 54 to 58 HRC. Lower hardness adds toughness; higher hardness adds wear resistance.
Is S7 air hardening?
Yes. Most sections of S7 can be air hardened, which reduces distortion and cracking risk compared with oil quenching.
Cut-to-Size S7 Tool Steel With Delivery Across Texas
We ship S7 tool steel throughout Texas, Oklahoma, Louisiana, New Mexico and Arizona, and we saw bar and plate to the size you need. See our processing services for cutting options, or browse all the metals we supply. We also supply A3, D7 and H11 tool steel.
To get pricing, send us the grade, condition, form, size, length and quantity through our quote request form, or call (888) 444-6061.