RAYCHIN LIMITED

Hex Head Screws (DIN 931 / DIN 933 / ISO 4014 / ISO 4017)

Alloy 330 hex head screws manufactured to DIN 931 (partial thread), DIN 933 (full thread), ISO 4014, ISO 4017, and ASME B18.2.1 standards. Features a six-sided head for external wrenching, providing high torque capability and positive drive. Ideal for high-temperature applications up to 1150°C in furnace components, heat exchangers, and structural assemblies. Available in sizes from M6 to M48 (metric) and 1/4" to 2" (inch) in various lengths. Precision rolled threads for superior strength and high-temperature performance. Supplied in solution annealed condition per ASTM B511.

Socket Head Cap Screws (DIN 912 / ISO 4762 / ASME B18.3)

Alloy 330 socket head cap screws manufactured to DIN 912, ISO 4762, and ASME B18.3 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 service up to 1150°C in gas turbines, heat treating fixtures, and industrial furnaces. Available in sizes from M3 to M36 (metric) and #0 to 1-1/2" (inch). Precision rolled threads for superior fatigue resistance.

Set Screws (DIN 913-916 / ISO 4026-4029 / ASME B18.3)

Alloy 330 set screws available with cup point (DIN 916, ISO 4026), cone point (DIN 914, ISO 4027), flat point (DIN 913, ISO 4028), and half-dog point (DIN 915, ISO 4029). Designed for securing rotating parts in high-temperature environments such as furnace rollers, heat treating fixtures, and thermal processing equipment. Available with hex socket or slotted drive. Sizes from M3 to M24 and #0 to 1". Excellent resistance to thermal cycling and carburizing atmospheres.

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 screws. Every heat is verified by in-house PMI testing to confirm chemistry. With 34-37% nickel and silicon addition, our screws 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 screws meet applicable ASTM B511, ASME SB511, AMS 5716, and all relevant screw standards.

Precision head forming & thread rolling

In-house CNC cold heading and precision thread rolling capabilities ensure consistent head dimensions and thread geometry. Precision rolled threads provide superior fatigue life and dimensional accuracy. 100% thread and dimensional inspection available. Controlled underhead fillet for improved fatigue resistance in thermal cycling applications.

Custom solutions

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