RAYCHIN LIMITED

Precision Shoulder Bolts (ASME B18.3 / DIN 7991)

Alloy 330 precision shoulder bolts manufactured to ASME B18.3 (inch) and DIN 7991 (metric) standards. Features a hex socket drive, precision-ground shoulder, and threaded end. Available in various shoulder diameters and lengths to suit specific applications. Ideal for high-temperature applications up to 1150°C where precision alignment and smooth motion are required. Shoulder tolerances held to ±0.025mm for precise fit. Available in sizes from 1/4" to 1" shoulder diameter (metric M6 to M24). Supplied in solution annealed condition per ASTM B511.

Stripper Bolts (Die Set Applications)

Alloy 330 stripper bolts designed specifically for die set and fixture applications. Features a longer shoulder length for guiding stripper plates and moving components. The smooth shoulder provides precise guidance while the threaded end secures the assembly. Excellent for high-temperature forming, stamping, and heat treating fixtures where moving parts must operate reliably at elevated temperatures. Available with various shoulder length-to-diameter ratios. Precision ground surface ensures smooth operation and long service life in demanding thermal environments.

Socket Shoulder Bolts (Hex Drive)

Alloy 330 socket shoulder bolts featuring deep hex socket drives for positive engagement and high torque capability. The hex socket allows for secure installation and removal even after repeated thermal cycling. Available in standard and heavy head configurations. Ideal for applications requiring frequent disassembly or where space constraints limit tool access. Precision rolled threads for superior strength and high-temperature performance. Sizes from 1/4" to 1" shoulder diameter.

Alloy 330 Shoulder Bolts – API & NACE Compliant

Alloy 330 shoulder bolts certified to NACE MR0175 / ISO 15156 for sour service applications in oil and gas industry. Suitable for wellhead equipment, valve assemblies, and subsea connections requiring precision shoulder bolts in high-temperature, H₂S environments. Available with full traceability and material certifications per ASTM B511. 100% NDT available including PMI, UT, and MPI.

Custom & Specialty Shoulder Bolts

Need a special shoulder diameter, unusual length, or custom drive configuration for your high-temperature application? RAYCHIN engineers work with you to produce custom Alloy 330 shoulder bolts to your drawing. Options include extra-long shoulders, multiple shoulder diameters, and special drive configurations. Expert heat treatment (solution annealed at 1038-1121°C) ensures optimum high-temperature performance. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS standards.

Metallurgical competence

Engineers on staff with deep expertise in nickel-based superalloys. We ensure proper solution annealing (1038-1121°C) for optimal high-temperature strength across all Alloy 330 shoulder bolts. Every heat is verified by in-house PMI testing to confirm chemistry. With 34-37% nickel and silicon addition, our shoulder bolts provide exceptional resistance to carburization, oxidation, and thermal cycling up to 1150°C.

Global approvals & traceability

Our quality system is ISO 9001:2015 and AS9100D certified; we also comply with NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS. Full material traceability from melt to final packaging (EN 10204 3.1/3.2). Third-party inspections (ABS, DNV, Lloyds) available. All Alloy 330 shoulder bolts meet applicable ASTM B511, ASME SB511, AMS 5716, and all relevant standards.

Precision shoulder grinding & thread rolling

In-house precision grinding capabilities ensure consistent shoulder dimensions and surface finish. Shoulders are ground to tight tolerances (±0.025mm) for accurate fit and smooth operation. Precision rolled threads provide superior fatigue life and dimensional accuracy. 100% dimensional inspection available on all critical features.

Custom solutions

Need a special shoulder diameter, unusual length, or custom drive configuration for your high-temperature application? Our engineering team works with you to produce custom Alloy 330 shoulder bolts to your drawing. We provide specialized surface treatments and processing per customer requirements.