Industrial Fastener · Threaded Rods Series
ASTM A193 B7 Stud Bolt
ASTM A193 Grade B7 is the most widely specified stud material for flange bolting in petrochemical, refining, and power generation. Made from heat-treated AISI 4140 / 42CrMo alloy steel, B7 stud bolts deliver high tensile strength with excellent performance up to about 400 °C.
Product Overview
ASTM A193 B7 Stud Bolt sourcing essentials
ASTM A193 Grade B7 is the most widely specified stud material for flange bolting in petrochemical, refining, and power generation. Made from heat-treated AISI 4140 / 42CrMo alloy steel, B7 stud bolts deliver high tensile strength with excellent performance up to about 400 °C.
ASTM A193 / A193M Grade B7
AISI 4140 / 42CrMo, quenched and tempered
ASTM A193 Grade B7 is the most widely specified stud material for flange bolting in petrochemical, refining, and power generation. Made from...
Inspection records, lot labels, certificate options, and destination-ready packing.
Technical Data
Specification range
Final dimensions, mechanical properties, finish, and packing are confirmed against the RFQ and applicable standard.
| Standard | ASTM A193 / A193M Grade B7 |
|---|---|
| Material | AISI 4140 / 42CrMo, quenched and tempered |
| Mechanical | Tensile 125 ksi min (≤ 2-1/2"), Yield 105 ksi min |
| Service Temperature | Up to ~400 °C (above this, B16 is preferred) |
| Mating Nut | ASTM A194 Grade 2H heavy hex |
| Documentation | Mill Test Certificate per heat lot, head/end stamping |
Common surface finishes
Select an option to review its sourcing note. Exact coating system, thickness, and corrosion requirement are confirmed with the order.
Quality Control
Checked before consolidation and export
Each order is matched to the specified standard and verified at practical control points before shipment.
RFQ confirmation
Standard, size, grade, pitch, finish, certificates, packing, and destination are locked before production.
Lot verification
Critical dimensions, thread fit, markings, finish appearance, and packing labels are sampled and recorded.
Shipment approval
Photos and required reports are organized before consolidated loading and export documentation.
Buyer Questions
Frequently asked questions
When should I specify A193 B7 vs B16?
B7 is suitable up to roughly 400 °C continuous service. Above this, B16 (chromium-molybdenum-vanadium alloy) maintains strength better. Both are widely available; the choice depends on flange service temperature.
What is A193 B7M?
B7M is the same chemistry as B7 but with controlled hardness (≤ 22 HRC) for sour-service environments where stress corrosion cracking from H2S is a concern. Specifically required by NACE MR0175 / ISO 15156 in oil and gas service.
Ready to quote ASTM A193 B7 Stud Bolt?
Send the standard, size, grade, finish, quantity, packing requirement, and destination. Availability and lead time are confirmed with the inquiry.