RapidBoltStud Bolt KitsPetrochemical Grade
Pre-kitted, fully traceable stud + nut + washer assemblies for flanged connections.
Build your kit
Engineered stud bolt kits supplied to ASTM A193 / A194 with full EN 10204 3.1 or 3.2 mill certification. Configure diameter, length, grade and coating — every kit ships with matching heavy-hex nuts and (optional) F436 washers, fully traceable from heat to delivery.
Select imperial nominal. Metric equivalent shown.
Range 1.5″–36″ in 0.25″ steps. Custom lengths on request.
Quenched & tempered chromium-moly alloy. The petrochemical workhorse. — Service: −48 °C to +400 °C.
Fluoropolymer. Excellent CoF for accurate bolt tensioning. Industry standard for offshore.
Heavy hex, quenched & tempered. Pairs with B7.
Determines stud length tables.
ASTM F436 hardened structural washers, one per nut.
- Imperial Thread
- ASME B1.1 — UN / 8-UN Series, Class 2A
- Metric Thread
- ISO 261 / ISO 965 — 6g tolerance
- Thread Length
- Full body thread (FBT) standard. Cut/rolled to spec.
- Stud Spec
- ASTM A193 / A320 — chamfered both ends
- Length Tolerance
- ±0.06″ (≤ 6″ length), ±0.12″ (> 6″ length)
- Straightness
- 0.006″ per inch length max
- Tensile Strength
- Min. 125 ksi (860 MPa) — ≤ 2½″ dia
- Yield Strength
- Min. 105 ksi (725 MPa) — ≤ 2½″ dia
- Elongation
- Min. 16% in 4D
- Hardness
- B7: 321 HBW max | B7M: 235 HBW max
Typical Applications
- Flanged piping — refineries, LNG trains, gas plants
- Wellhead & Christmas tree (API 6A connections)
- Pressure vessel & heat exchanger bolting
- Subsea jumpers, manifolds & PLEMs
- Power generation steam & turbine flanges
Certification & Testing
- EN 10204 3.1 mill certification (standard)
- EN 10204 3.2 third-party witnessed (Lloyd's, BV, DNV, ABS) on request
- PMI (Positive Material Identification) per ASTM E1476
- NACE MR0175 / ISO 15156 sour-service verification
- Magnetic particle / dye penetrant NDT to ASTM E709 / E165
- Charpy impact testing per ASTM A370 / E23
Not sure which coating the joint needs?
Xylan 1424, GEOMET 321/500, hot-dip galvanising and aluminium-ceramic systems compared by service environment, temperature limit and coefficient of friction.