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.

Flange Nuts in Special Alloys | Serrated & Plain Flange Nuts Manufacturer | RAYCHIN

RAYCHIN manufactures high-performance flange nuts in 25+ alloys including Monel, Hastelloy, Titanium & Duplex Steel. Serrated flange nuts, non-serrated flange nuts compliant with DIN, ISO, ASME standards. Custom OEM flange nuts for vibration resistance.

Flange Nuts: Integrated Washer Design for Vibration Resistance & Load Distribution

RAYCHIN specializes in manufacturing precision flange nuts, advanced fasteners that integrate a wide, fixed flange (washer) at the nut's base. This design eliminates the need for a separate washer, providing a larger bearing surface to distribute load, protect sensitive materials, and resist loosening under vibration. Our flange nuts are engineered from over 25 high-performance alloys, making them ideal for applications in automotive, aerospace, electronics, and industrial assembly where reliability, space savings, and corrosion resistance are critical.

We produce both serrated flange nuts for superior vibration resistance and non-serrated (plain) flange nuts for smooth surfaces, with full compliance to DIN, ISO, ASME, and JIS standards. Custom designs from your drawings are our core expertise.

Flange Nut Types & Classifications

1. Serrated Flange Nuts (Vibration-Resistant):

• DIN 6923 Flange Nuts (ISO 4161): The industry standard with a serrated (toothed) underside on the flange. The serrations bite into the mating surface to prevent rotation. Widely used in automotive and structural applications.

• Non-Serrated (Plain) Flange Nuts (DIN 1665): Feature a smooth bearing surface, suitable for frequent disassembly or use on soft materials where serrations would cause damage.

• Heavy-Duty Flange Nuts: Feature a thicker and wider flange for higher load-bearing requirements.

2. Special Application Flange Nuts:

• Flange Lock Nuts: Combine the flange with a prevailing torque locking feature (e.g., nylon insert or all-metal deformed thread) for double security against loosening.

• Weld Flange Nuts: Designed with a projection for attachment to a surface via welding, creating a permanent threaded stud.

• Flange Nuts with Captive Washer: The washer is free-spinning but captive, a variation on the standard fixed design.

• Custom Flange Nuts: Manufactured to your OEM specifications with unique flange diameters, thicknesses, serration patterns, and special materials.

Full Material Portfolio with International Standard Designations

We fabricate flange nuts in the following specialized materials to meet environmental challenges.

• Precipitation-Hardening Stainless Steels:

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

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

• Nickel-Based Superalloys:

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

  • 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 standards.

• 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 Gr. 660.

• Pure Nickel:

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

Custom Flange Nut Manufacturing & Quality Assurance

RAYCHIN provides end-to-end solutions for your specialized flange nut requirements.

• Design & Engineering Support: We analyze your application to recommend the optimal flange style (serrated/plain), material, and grade.

• Precision Manufacturing: Capabilities include cold forming, CNC machining, serration knurling, and controlled heat treatment.

• Material & Performance Certification: Each lot is supplied with full Material Test Reports (MTRs). We can provide vibration testing data and compliance statements for AS9100, ISO 9001, and RoHS.

• Global Standard Compliance: Our nuts are produced to DIN 6923, DIN 1665, ISO 4161, ISO 7411, and ASME B18.2.2 specifications, ensuring global interchangeability.

Key Industries & Applications

• Automotive & Transportation: Engine components, chassis assembly, body panels, and interior trim.

• Aerospace & Aviation: Avionics racks, interior panels, and non-critical structural attachments.

• Electronics & Telecommunications: Equipment enclosures, heat sinks, and PCB mounting.

• General Machinery & Assembly: Any application requiring a combination of clamping force, vibration resistance, and a finished appearance.

Request a Quote for Flange Nuts
Contact RAYCHIN with your specifications or drawings for a prompt consultation and competitive quotation on standard or custom flange nuts.

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