High-Strength ASTM A193 B7 Stud Bolts for Flanges and Pressure Equipment

High-Strength ASTM A193 B7 Stud Bolts & Bolts by Handan Haosheng Fastener Co., Ltd.

In pressure equipment, industrial piping and high-temperature bolted joints, the
fastener is often the part that decides whether a joint holds. ASTM A193 Grade B7
stud bolts have become the standard choice for these applications because they keep
their strength when the temperature rises. Handan Haosheng Fastener Co., Ltd., a
manufacturer based in Handan, China, specializes in producing B7 stud bolts, B7 hex
head bolts and matching ASTM A194 Grade 2H nuts for industrial customers worldwide.

Why Choose ASTM A193 B7 Bolting?

✔ High-Temperature Strength– The chromium-molybdenum chemistry lets B7 retain
its mechanical properties up to roughly 425 °C, well beyond the practical limit of a
standard class 8.8 fastener.

✔ High Tensile and Yield Strength – Quenched and tempered to a minimum 125 ksi
(approx. 860 MPa) tensile and 105 ksi (approx. 725 MPa) yield for diameters up to
2½ inches, with graded values above that size.

✔ Controlled Chemistry – 0.38–0.48% carbon, 0.80–1.10% chromium and 0.15–0.25%
molybdenum, verified against the heat analysis rather than assumed from the grade
name.

✔ Ductility Under Overload – Hardness is capped at 321 HBW, so the fastener
deforms before it fractures instead of failing without warning.

✔Matched with Grade 2H Nuts – Supplied with ASTM A194 Grade 2H heavy hex nuts
as a compatible assembly, with thread and dimensions confirmed before shipment.

Haosheng’s B7 Bolt & Stud Solutions

At Handan Haosheng Fastener Co., Ltd., we offer:

- Fully threaded studs and double-end studs, cut and threaded to the length your
joint design requires.
- B7 hex head bolts in metric dimensions (GB/T 5783) or inch dimensions
(ASME B18.2.1), quoted against the agreed standard.
- Thread options including UNC, 8UN and metric M series.
- Surface finishes including plain, black, zinc flake and PTFE-based coatings, with
hydrogen embrittlement risk assessed for each option.
- B7M studs for wet H2S service, with hardness capped at 235 HBW.

Our B7 bolting is widely used in:

- Piping flanges and pressure equipment
- Valves, pumps and compressor assemblies
- Oil, gas and petrochemical plants
- Power generation and boiler systems

Why Partner with Haosheng?

✅ 33 years of fastener manufacturing experience
✅ Source factory with 200+ production equipment and a 30,000 m² plant
✅ Batch-level mechanical and dimensional testing with material certificates
✅ Competitive pricing and stable bulk supply
✅ OEM/ODM and drawing-based manufacturing available

For industries that need bolting which holds its strength under pressure and heat,
Handan Haosheng’s ASTM A193 B7 studs and bolts deliver consistent, documented
performance.

Contact us today to discuss your requirements.