RAYCHIN LIMITED

Metric Socket Head Cap Screws (DIN 912 / ISO 4762)

Incoloy metric socket head cap screws manufactured to DIN 912 and ISO 4762 standards. Features a cylindrical head with hex socket drive, providing high clamping force and clean appearance. The controlled fillet under the head reduces stress concentration and improves fatigue life in thermal cycling applications. Ideal for high-temperature corrosive applications up to 1150°C for grade 800 series, and up to 540°C for acid service with grade 825. Available in sizes from M3 to M36 in various lengths. Precision rolled threads for superior strength and corrosion resistance. Supplied in solution annealed condition per ASTM standards.

Inch Socket Head Cap Screws (ASME B18.3)

Incoloy inch socket head cap screws manufactured to ASME B18.3 standards. Features a cylindrical head with hex socket drive, designed for American standard applications. Precision rolled UNC, UNF, and UNJF-3A threads for superior fatigue resistance. Available in sizes from #0 to 1-1/2" in various lengths. Supplied with passivated finish per ASTM A967. Ideal for oil & gas, marine, and industrial applications requiring NACE MR0175 compliance with Incoloy 825 or 925 grades. Also available in low head and button head configurations.

Low Head Socket Cap Screws (DIN 7984 / ASME B18.3)

Incoloy low head socket cap screws manufactured to DIN 7984 and ASME B18.3 standards. Features a reduced head height for applications with limited clearance while maintaining the same socket size as standard SHCS for drive tool compatibility. Ideal for confined spaces in high-temperature corrosive environments. Available in sizes from M3 to M36 (metric) and #0 to 1" (inch). Precision rolled threads for superior fatigue resistance.

Button Head Socket Cap Screws (DIN 7380 / ISO 7380)

Incoloy button head socket cap screws manufactured to DIN 7380 and ISO 7380 standards. Features a low-profile domed head for smooth appearance and reduced turbulence. Ideal for aesthetic applications and where smooth surfaces are required in corrosive environments. Available in sizes from M3 to M24 (metric) and #4 to 1" (inch). Precision rolled threads for superior strength and corrosion resistance.

Incoloy Socket Head Cap Screws – API & NACE Compliant

Incoloy socket head cap screws certified to NACE MR0175 / ISO 15156 for sour service applications in oil and gas industry. Incoloy 825 and 925 grades are qualified for H₂S environments at elevated temperatures. Incoloy 925 offers premium resistance to sulfide stress cracking with yield strengths up to 760 MPa in aged condition. Available in all configurations with 100% NDT available including PMI, UT, and MPI. Full traceability and material certifications per ASTM standards.

Custom & Specialty Socket Head Cap Screws

Need a special head configuration, unusual drive, or custom material certification for your extreme environment application? RAYCHIN engineers work with you to produce custom Incoloy socket head cap screws to your drawing. Options include extra-long lengths, reduced head height, and special thread classes. Expert heat treatment (solution annealed for 800/825, aged for 925) ensures optimum properties. 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-iron-chromium superalloys. We ensure proper heat treatment for each grade—solution annealing for 800/825, optimized annealing for 800H/HT, and precise aging for 925—to achieve optimal properties. Every heat is verified by in-house PMI testing to confirm chemistry. Our socket head cap screws provide the exact balance of high-temperature strength and corrosion resistance required for your application.

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 Incoloy socket head cap screws meet applicable ASTM, ASME, NACE MR0175, and API standards.

Precision head forming & socket drive

In-house CNC cold heading and precision socket forming capabilities ensure consistent head dimensions and drive geometry. Precision rolled threads provide superior fatigue life and dimensional accuracy. Deep, accurate hex sockets for maximum key engagement and torque transfer. 100% thread and drive inspection available. Controlled fillet under head for improved fatigue resistance.

Custom solutions

Need a special head configuration, unusual drive, or custom material certification for your extreme environment application? Our engineering team works with you to produce custom Incoloy socket head cap screws to your drawing. We provide specialized surface treatments, passivation, and NACE MR0175 compliant processing per customer requirements.