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.

The main difference between hex flange bolts and 12-point flange bolts is the number of points on the head:

Flange Bolts | High-Performance Serrated & Non-Serrated Flange Fasteners | RAYCHIN Manufacturer

RAYCHIN manufactures precision flange bolts in 25+ alloys including Hastelloy, Monel, Titanium & Duplex Steel. Serrated flange bolts, non-serrated flange bolts & weld neck bolts compliant with ASME, DIN, JIS, ISO standards. Custom OEM solutions available.

High-Performance Flange Bolts for Secure Vibration-Resistant Connections

RAYCHIN is a leading manufacturer of precision-engineered flange bolts (also called frame bolts or flange head bolts) designed to eliminate the need for separate washers. Our integral flange provides superior load distribution, prevents pull-through, and offers excellent vibration resistance. We produce these critical fasteners in over 25 specialized alloys to meet the demands of aerospace, chemical processing, oil & gas, and power generation industries worldwide.

Flange Bolt Types & Classifications

We manufacture comprehensive flange bolt configurations to meet diverse application requirements:

1. Serrated Flange Bolts:

• Underhead Serrated Flange Bolts: Feature locking serrations beneath the flange that bite into mating surfaces for exceptional vibration resistance. Compliant with DIN 6921, ISO 1665, and IFI-148 standards.

• NAS Flange Bolts: Aerospace-grade serrated flange bolts meeting NAS 6202 through NAS 6206 specifications for critical structural applications.

2. Non-Serrated (Plain) Flange Bolts:

• Standard flange bolts with a smooth bearing surface, manufactured to DIN 6921, ISO 4162, and JIS B1189 standards. Ideal for applications requiring frequent disassembly.

3. Flange Screws & Special Designs:

• Hex Flange Screws: Combines hex head with integral flange.

• 12-Point Flange Bolts: For high-torque aerospace and racing applications.

• Weld Neck Flange Bolts: Designed for direct welding to structures in pressure vessel and pipeline systems.

• Custom Flange Designs: Produced to customer-specific OEM drawings with unique flange diameters, thicknesses, and geometries.

Material Grades & International Standard Specifications

Our flange bolts are available in the following advanced material systems with full traceability:

1. Precipitation-Hardening Stainless Steels:

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

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

2. Nickel-Based Superalloys:

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

• Monel® Alloys: Monel K500 (UNS N05500/AMS 4676), Monel 400 (UNS N04400/ASTM F467).

• Hastelloy® Alloys: Hastelloy C276 (UNS N10276/ASTM B574), C22 (UNS N06022), B2 (UNS N10665), X (UNS N06002).

• Waspaloy (UNS N07001): Per AMS 5708, AMS 5824 specifications.

• Nimonic® Series: Nimonic 80A (UNS N07080), Nimonic 90 (UNS N07090) to BS HR 501/502 standards.

3. Duplex & Super Duplex Stainless Steels:

• Duplex Steel: Duplex 2205 (UNS S32205) compliant with ASTM A193 B8S, EN 1.4462, UNS S31803.

• Super Duplex Alloys: Alloy 926 (UNS N08926), AL-6XN® (UNS N08367) meeting ASTM A193 B8S, NACE MR0175.

4. Titanium Alloys:

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

• Grade 2 Titanium: UNS R50400 to ASTM B348, AMS 4921.

5. Refractory & Exotic Metals:

• Tantalum (UNS R05200): ASTM B365, AMS 7845.

• Zirconium 702 (UNS R60702): ASTM B550, ASME SB550.

• Molybdenum (UNS R03600) & Tungsten: For extreme temperature applications.

6. Specialty Alloys:

• Nitronic® Alloys: Nitronic 60 (UNS S21800), Nitronic 50 (UNS S20910) to ASTM A193 B8N.

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

• Cobalt Alloys: MP35N (UNS R30035/AMS 5844), MP159 (AMS 5846).

• Iron-Based Superalloy: A286 (UNS S66286) to AMS 5731, ASTM A453 Grade 660.

7. Aluminum Alloy:

• Aluminum 7075 (UNS A97075): AMS QQ-A-225/9, ASTM F467 in T6, T73 tempers.

8. Pure Nickel & Incoloy:

• Nickel 200 (UNS N02200): ASTM B160, ASME SB160.

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

Custom Flange Bolt Manufacturing Services

RAYCHIN provides complete custom flange bolt manufacturing from your technical specifications:

• Standards Compliance: ASME B18.2.1, DIN 6921, ISO 4162, JIS B1189, NASM 25027, and customer drawings.

• Special Features: Underhead serrations, weld neck designs, 12-point heads, reduced shanks, thread-locking features.

• Full Processing: Hot/cold forging, CNC machining, thread rolling, heat treatment, surface finishing.

• Quality Assurance: Complete MTRs (EN 10204 3.1), chemical & mechanical testing, compliance with AS9100, ISO 9001, PED 2014/68/EU.

Industry Applications

• Aerospace & Defense: Engine mounts, structural assemblies, access panels (NAS, MS standards)

• Chemical Processing: Reactor flanges, pump connections, valve assemblies

• Oil & Gas: Pipeline flanges, wellhead equipment, compressor housings

• Power Generation: Turbine casings, heat exchangers, nuclear components

• Transportation: Engine components, chassis assemblies, braking systems

• Industrial Machinery: Gearboxes, press frames, heavy equipment

Why Choose RAYCHIN?

• Material Expertise: 25+ years experience with exotic alloy flange bolts

• Global Certification: Products meet ASME, DIN, JIS, ISO, ASTM, AMS standards

• Engineering Support: Complete design-to-production services

• Global Supply: Reliable supplier to North America, Europe, Asia Pacific, Middle East markets

• Quality Commitment: 100% dimensional inspection, full traceability, batch testing

Request Flange Bolt Quotation
Contact RAYCHIN for engineering consultation and competitive pricing. Submit your drawings for serrated flange bolts, non-serrated flange bolts, or custom flange fasteners.

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