RAYCHIN LIMITED, we are materials experts who focus only on fasteners made from the highest performance specialty metals for the most challenging and extreme applications.

• Stainless Steel Series: Martensitic Stainless Steel, Ferritic Stainless Steel, Austenitic Stainless Steel, Austenitic-Ferritic (Duplex) Stainless Steel and Precipitation Hardening Stainless Steel.

• Super Alloys Series: Nickel-based Alloy, Cobalt-based Alloy, Iron-based Alloy, Molybdenum-based Alloy, ‌Titanium-based Alloy, Copper based Alloy, ‌Zirconium Alloy.

• Alloy Steel Series: Low Alloy Steel, Medium Alloy Steel, High Alloy Steel, Special Alloy Steel.

Machine Screws

Precision Machine Screws in Special Alloys | Custom & OEM Machine Screw Manufacturer | RAYCHIN

RAYCHIN manufactures precision machine screws in 25+ exotic alloys: 17-4 PH, Inconel 718, Titanium, Hastelloy, MP35N & more. Socket head, flat head, pan head screws compliant with ASME, DIN, ISO, JIS standards. Custom OEM solutions.

Precision Machine Screws for Critical Assembly Applications

RAYCHIN is a specialized manufacturer of high-precision machine screws, engineered fasteners designed for assembly into tapped holes or used with nuts in metal-to-metal applications. Unlike wood or sheet metal screws, machine screws feature consistent threading and precise dimensional tolerances, making them essential in electronics, medical devices, aerospace, automotive, and precision instrumentation industries. We produce these critical components from over 25 advanced alloys to ensure reliability in corrosive, high-temperature, and high-stress environments where material integrity is non-negotiable.

Our capabilities include manufacturing custom machine screws to your exact specifications, with full compliance to ASME, DIN, ISO, JIS, and MIL-SPEC standards, backed by complete material certification and traceability.

Machine Screw Types & Classifications

1. By Drive Type:

• Socket Head Cap Screws (Allen): ASME B18.3, DIN 912, ISO 4762. Internal hex drive for high torque and low profile.

• Flat Head/Countersunk Screws: ASME B18.6.3, DIN 963, ISO 2009. For flush mounting with surfaces.

• Pan Head Screws: ASME B18.6.3, DIN 7985. Low-profile domed head with high outer edge.

• Button Head Socket Screws: ASME B18.3, DIN 7380. Low-profile domed head with internal hex drive.

• Fillister Head Screws: ASME B18.6.3. Taller, rounded head with deep slot for higher torque.

2. By Thread Type:

• Unified Threads (UNC/UNF/UNEF): ASME B1.1 standard.

• Metric Threads (ISO): ISO 261 and ISO 262 standards.

• Special Threads: Including Whitworth, BA, and custom thread forms.

• Thread Classes: 2A, 3A (high precision), and special tolerance threads.

3. Special Application Machine Screws:

• Shoulder Screws (Stripper Bolts): For precise alignment and pivoting in molds and fixtures.

• Set Screws: Fully threaded without head, for securing collars and pulleys.

• Self-Tapping Machine Screws: For use in softer metals or plastics.

• Custom OEM Machine Screws: Manufactured to your detailed drawings with unique head styles, drive types, thread specifications, and material grades.

Full Material Portfolio with International Standard Designations

We machine screws from the following comprehensive range of high-performance materials:

• Precipitation-Hardening Stainless Steels:

  • 17-4 PH (UNS S17400): ASTM A564 Type 630, AMS 5643, DIN 1.4542 (H900, H1025, H1150 tempers).

  • PH 13-8 Mo (UNS S13800): ASTM A564 Type 625, AMS 5629.

• Nickel-Based Superalloys:

  • Inconel®: Inconel 718 (UNS N07718/AMS 5663), Inconel 625 (UNS N06625/ASTM B446), Inconel 600 (UNS N06600).

  • Monel®: Monel 400 (UNS N04400), Monel K500 (UNS N05500/AMS 4676).

  • Hastelloy®: Hastelloy C276 (UNS N10276/ASTM B574), Hastelloy C22 (UNS N06022), Hastelloy B2 (UNS N10665).

  • Incoloy®: Incoloy 825 (UNS N08825), Incoloy 925 (UNS N09925).

  • Waspaloy (UNS N07001): AMS 5708.

  • Nimonic® Alloys: Nimonic 80A (UNS N07080), Nimonic 90 (UNS N07090) per BS HR 501/502.

• Duplex & Super Duplex Stainless Steels:

  • Duplex Steel: Duplex 2205 (UNS S32205 / EN 1.4462 / ASTM A182).

  • Super Duplex/6Mo Alloys: Alloy 926 (UNS N08926), AL-6XN® (UNS N08367). NACE MR0175 compliant.

• Titanium Alloys:

  • Grade 2 (UNS R50400): ASTM B348.

  • Grade 5, Ti-6Al-4V (UNS R56400): AMS 4928, ASTM F467.

• Refractory & Exotic Metals:

  • Tantalum (UNS R05200): ASTM B365.

  • Zirconium 702 (UNS R60702): ASTM B550.

  • Molybdenum (UNS R03600) & Tungsten.

• Specialty Corrosion-Resistant Alloys:

  • Nitronic®: Nitronic 50 (XM-19, UNS S20910), Nitronic 60 (UNS S21800).

  • High-Performance Stainless: 254 SMO (UNS S31254/EN 1.4547), 310 Stainless Steel (UNS S31000), Alloy 20 (Carpenter 20, UNS N08020), Alloy 330 (UNS N08330).

• Ultra-High-Strength Alloys:

  • MP35N (UNS R30035): AMS 5844.

  • MP159: AMS 5846.

• High-Strength Aluminum & Iron-Based Superalloy:

  • Aluminum 7075 (UNS A97075): AMS QQ-A-225/9 (T6 temper).

  • A286 (UNS S66286): AMS 5731, ASTM A453 Grade 660.

• Pure Nickel:

  • Nickel 200 / 201 (UNS N02200 / N02201): ASTM B160.

Custom Machine Screw Manufacturing & Quality Assurance

RAYCHIN provides end-to-end solutions for your most demanding machine screw requirements.

• Precision Manufacturing: Utilizing Swiss-style CNC machining, cold heading, and thread rolling for superior dimensional accuracy, surface finish, and material strength.

• Full Material & Processing Control: From raw material certification to final heat treatment and plating/passivation, we ensure every step meets specifications.

• Stringent Quality Control: 100% dimensional inspection, lot traceability, and comprehensive testing including salt spray, tensile strength, and metallography as required.

• Complete Certification: Supplied with Material Test Reports (MTRs to EN 10204 3.1) and compliance documentation for AS9100, ISO 9001, ISO 13485 (medical), and RoHS.

• Global Standard Expertise: Screws are produced to ASME B18.6.3, DIN 912/7985/963, ISO 4762/2009/7380, JIS B1111, and customer-specific standards.

Industry Applications

• Medical & Surgical Devices: Implants, diagnostic equipment, and surgical tools requiring biocompatible materials like Titanium and MP35N.

• Aerospace & Aviation: Avionics, control systems, and instrumentation panels using high-strength, lightweight alloys like A286 and Aluminum 7075.

• Semiconductor & Electronics: Wafer processing equipment and sensitive electronics where corrosion and contamination control are critical (e.g., Hastelloy C22).

• Chemical Processing: Pumps, valves, and analytical instruments exposed to aggressive media (e.g., Alloy 20, Zirconium).

• High-Performance Automotive: Engine management systems and sensors in demanding environments.

Request a Quote for Precision Machine Screws
Contact RAYCHIN's engineering team with your specifications or drawings. We provide technical consultation and rapid prototyping for standard and custom machine screw solutions.

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