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.

Heavy Hex Bolts & Heavy Hex Structural Bolts in High-Performance Alloys | RAYCHIN Custom Manufacturer

RAYCHIN manufactures high-strength heavy hex bolts in 25+ alloys like A193 B8M, A320 L7, Titanium Gr5, Monel K500 & Duplex 2205. Compliant with ASTM, ASME, SAE, EN, and DIN standards. Custom heavy hex structural bolts for chemical, oil & gas, and aerospace applications.

High-Strength Heavy Hex Bolts for Demanding Structural & Pressure Applications

RAYCHIN is a premier manufacturer of heavy hex bolts, heavy hex structural bolts, and heavy hex cap screws engineered from specialized alloys for critical connections. Our heavy hex nuts and bolts feature a larger head and wrenching surface compared to standard hex bolts, providing greater clamping force, improved torque resistance, and enhanced load distribution. We produce these vital components to meet rigorous ASTM, ASME, SAE, DIN, and EN specifications for global infrastructure projects.

Comprehensive Material Grades & Standard Specifications for Our Heavy Hex Bolts

We supply heavy hex bolts in the following high-performance material families, each with precise international standard designations:

1. Precipitation-Hardening Stainless Steels:

• 17-4 PH (ASTM A564 Type 630 / UNS S17400 / AMS 5643): Delivers high strength (H900, H1025, H1150 tempers) suitable for heavy hex head bolts in corrosive, high-stress environments.

• PH 13-8 Mo (ASTM A564 Type 625 / UNS S13800 / AMS 5629): Offers an excellent combination of strength, toughness, and corrosion resistance for critical aerospace and marine heavy hex fasteners.

2. Nickel-Based Superalloys (For High-Temperature & Corrosive Service):

• Inconel® Alloys: Including Inconel 600 (UNS N06600), Inconel 625 (UNS N06625 / ASTM A193 B8M Class 2), and Inconel 718 (UNS N07718 / AMS 5663) for extreme heat and oxidation resistance in pressure vessel bolts.

• Monel® Alloys: Monel 400 (UNS N04400 / ASTM A193 B7M) and age-hardenable Monel K500 (UNS N05500) for superior corrosion resistance in marine and offshore heavy hex structural bolts.

• Hastelloy® Alloys: Such as Hastelloy C276 (UNS N10276 / ASTM A193 B6), C22 (UNS N06022), and B2 (UNS N10665) for severe chemical processing environments.

• Incoloy® Alloys: Incoloy 825 (UNS N08825) and Incoloy 925 (UNS N09925) for applications requiring resistance to both oxidation and aqueous corrosion.

• Waspaloy (UNS N07001 / AMS 5708): A high-strength alloy for demanding aerospace turbine heavy hex fasteners.

• Nimonic® Alloys (e.g., Nimonic 80A, 90): Conform to BS HR series standards for exceptional high-temperature creep resistance.

3. Duplex & Super Duplex Stainless Steels:

• Duplex Steel: Common grades like Duplex 2205 (UNS S32205 / ASTM A193 B8S) offer double the yield strength of 316 stainless, ideal for offshore and subsea heavy hex bolts.

• Super Duplex & 6Mo Alloys: Alloy 926 (UNS N08926) and AL-6XN® (UNS N08367) provide the highest pitting resistance (PREN >40) for chloride-rich environments, compliant with ASTM A193 B8S and similar specifications.

4. Titanium Alloys (High Strength-to-Weight Ratio):

• Commercially Pure Titanium: Grade 2 (UNS R50400 / ASTM B348).

• Aerospace-Grade Titanium: Grade 5, Ti-6Al-4V (UNS R56400 / AMS 4928 / ASTM F467), widely used in airframe structural heavy hex bolts.

5. Refractory & Exotic Metals:

• Tantalum (UNS R05200 / ASTM B365): For ultimate corrosion resistance in aggressive acid service, used in specialty chemical reactor bolts.

• Zirconium 702 (UNS R60702 / ASTM B550): Excellent in sulfuric and hydrochloric acid environments.

• Molybdenum (UNS R03600) & Tungsten: For extreme high-temperature and specialized industrial applications.

6. Specialty Austenitic Stainless Steels & Nickel Alloys:

• Nitronic® Alloys: Nitronic 50 (XM-19, UNS S20910) and Nitronic 60 (UNS S21800) offer high strength and galling resistance for valve stem and high-wear heavy hex bolts.

• High-Performance Stainless: 254 SMO (UNS S31254), 310 Stainless Steel (UNS S31000 / ASTM A193 B8H), Alloy 20 (Carpenter 20, UNS N08020), and Alloy 330 (UNS N08330) for various heat and corrosion challenges.

• High-Strength, Non-Magnetic Cobalt Alloys: MP35N (UNS R30035 / AMS 5844) and MP159 (AMS 5846) for unparalleled strength and toughness in downhole tooling and aerospace bolts.

7. High-Strength Aluminum:

• Aluminum 7075 (UNS A97075 / ASTM F467 / AMS QQ-A-225/9): Typically supplied in T6 temper for high-strength, lightweight structural heavy hex bolts.

8. Pure Nickel & Iron-Based Superalloy:

• Nickel 200 / 201 (UNS N02200 / N02201 / ASTM B160): For excellent corrosion resistance and high conductivity.

• A286 (UNS S66286 / AMS 5731 / ASTM A453 Grade 660): An iron-based superalloy with high strength at elevated temperatures, often used as ASTM A320 L7 type heavy hex bolts for low-temperature service.

Custom Heavy Hex Bolt Manufacturing to Your Specifications

RAYCHIN specializes in custom OEM heavy hex fasteners manufactured directly from your engineering drawings. We provide complete solutions for non-standard applications.

• Full Customization: Available in ASME B18.2.1, SAE J429, DIN 931/933 (Heavy Series), and ISO 4014/4017 dimensions, or to your unique specifications. We produce heavy hex flange bolts, heavy hex machine bolts, and heavy hex tap bolts.

• Complete Processing: Capabilities include hot and cold forging, CNC machining, thread rolling and cutting, and certified heat treatment and solution annealing.

• Quality & Traceability: We provide full Material Test Reports (MTRs) to EN 10204 3.1 and C of C, supporting AS9100, ISO 9001, PED, and NACE MR0175/ISO 15156 compliance.

Industries Served

Our heavy hex structural bolts are essential in:

• Oil & Gas and Petrochemical (ASTM A193/A320): Pressure vessels, heat exchangers, pipeline flanges, wellhead equipment.

• Chemical Processing: Reactors, columns, and piping systems handling corrosive media.

• Power Generation (Fossil, Nuclear, Renewable): Turbine assemblies, boiler supports, structural connections.

• Aerospace & Defense (AS/EN/JISQ 9100): Engine mounts, airframe structures, landing gear.

• Marine & Shipbuilding: Hull structures, deck fittings, offshore platform modules.

• Heavy Machinery & Construction: High-stress structural connections for bridges and industrial equipment.

Why Choose RAYCHIN for Your Heavy Hex Bolts?

• Specialized Alloy Expertise: Deep metallurgical knowledge across 25+ advanced material systems.

• Global Standards Mastery: Products are manufactured to meet ASTM, SAE, ASME, DIN, BS, and JIS standards for worldwide approval.

• Engineered Solutions: Our engineering team supports you from material selection and design optimization to prototyping and production.

• Global Supply Chain: A reliable fastener manufacturer and supplier serving clients across North America, Europe, the Middle East, and Asia-Pacific.

Request a Quote for Your Heavy Hex Bolt Requirements
Contact RAYCHIN today for a technical consultation and competitive quotation. Submit your drawings and specifications to our engineering team for a prompt review and feasibility analysis.

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