RAYCHIN LIMITED

Incoloy Bolts

Incoloy bolts manufactured to DIN 931, DIN 933, ISO 4014, ISO 4017, ASME B18.2.1, and aerospace standards. Available in hex head, heavy hex, flange head, and socket head configurations. 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 M6 to M100 (metric) and 1/4" to 4" (inch) in various lengths. Precision rolled threads for superior strength and corrosion resistance. Supplied in solution annealed condition per ASTM standards.

Incoloy Nuts

Incoloy nuts manufactured to DIN 934, ISO 4032, ISO 4033, ISO 4034, and ASME B18.2.2 standards. Available in hex nuts, heavy hex nuts, jam nuts, and lock nuts. Precision tapped to Class 2B and 3B tolerances for reliable engagement with mating bolts and studs. Ideal for pressure vessel closures, heat exchanger tube sheets, and flange connections in high-temperature and corrosive environments. Available in all Incoloy grades. Sizes from M3 to M100 (metric) and #4 to 4" (inch).

Incoloy Screws

Incoloy screws including hex head screws, socket head cap screws (DIN 912, ISO 4762, ASME B18.3), flat head screws, button head screws, pan head screws, and set screws. Available with various drive types including hex socket, Torx, and slotted. Ideal for instrument connections, valve components, and equipment in high-temperature and corrosive environments. Sizes from M3 to M36 and #2 to 1-1/2".

Incoloy Washers

Incoloy washers manufactured to DIN 125, DIN 9021, ISO 7089, ISO 7093, and ASME B18.22.1 standards. Available in flat washers, heavy washers, and spring washers. Precision stamped or machined from solution annealed Incoloy, these washers provide uniform load distribution under bolt heads and nuts. Ideal for flange connections, heat exchanger tube sheets, and vessel assemblies. Sizes from M3 to M100 and #2 to 4".

Incoloy Stud Bolts

Incoloy stud bolts manufactured to DIN 938, DIN 939, DIN 976, ASME B16.5, and ASME B18.31.2 standards. Available in double-end studs, fully threaded studs, and tap-end studs. Designed for flange connections, pressure vessel closures, and heat exchanger applications. Essential for ASME B16.5 flange bolting in chemical plants, refineries, and power generation. Sizes from 1/4" to 4" (M6 to M100) in various lengths.

Incoloy Threaded Rods

Incoloy threaded rods manufactured to DIN 975, DIN 976, ASME B18.31.1M, and ASME B18.31.2 standards. Continuous threads along the entire length allow for cutting to any required length for custom applications. Ideal for pipe supports, flange connections, and structural assemblies in high-temperature and corrosive environments. Available in diameters from 1/4" to 4" (M6 to M100) in standard lengths up to 6 meters. Precision rolled threads for superior strength and consistency.

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 fasteners 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 fasteners meet applicable ASTM, ASME, NACE MR0175, and API standards.

Precision forming & thread rolling

In-house cold heading, hot forging, 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 high-temperature cyclic applications.

Custom solutions

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