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 Nuts in Special Alloys | High-Strength ASTM A194 Heavy Hex Nuts Manufacturer | RAYCHIN

Meta Description: RAYCHIN manufactures heavy hex nuts in 25+ alloys including A286, MP35N, Hastelloy & Duplex Steel. Compliant with ASTM A194, ASME B18.2.2, DIN 934. Custom heavy series hex nuts for pressure vessel, flange & structural applications. Global supplier.

High-Strength Heavy Hex Nuts for Critical Structural & Pressure Applications

RAYCHIN is a specialized manufacturer of heavy hex nuts, the industry-standard choice for applications demanding superior load distribution, higher preload, and maximum thread engagement. Compared to standard hex nuts, heavy hex series nuts feature a larger across-flats width and greater thickness, making them essential for pressure vessel flanges, structural steel connections, pipeline systems, and high-pressure valve assemblies.

We engineer these critical components from over 25 advanced metal alloys to withstand extreme conditions of stress, temperature, corrosion, and vibration. Our heavy hex finished nuts are manufactured to exacting ASTM, ASME, DIN, and ISO specifications, ensuring compatibility and performance in global projects.

Heavy Hex Nut Types & Specifications

1. Standard Heavy Hex Nuts:

• Heavy Hex Finished Nuts: (ASME B18.2.2, ASTM A194 / A563, ISO 4032). The most common type for general high-strength bolting.

• Heavy Hex Jam Nuts (Thin Heavy Hex Nuts): (ASME B18.2.2, ASTM A194). Used where a full-height nut is not required, often as a locknut.

2. Special Application Heavy Hex Nuts:

• Heavy Hex Machine Screw Nuts: For use with smaller diameter bolts.

• Heat-Treated Heavy Hex Nuts: Specifically processed (e.g., quenched & tempered) to achieve required mechanical properties per standards like ASTM A194 Grade 2H, 2HM, 7, 7M.

• Custom Heavy Hex Nuts: Manufactured to your exact OEM drawings with non-standard dimensions, special thread pitches (UN, Metric, Acme), or unique features like drilled holes for safety wiring.

Full Material Portfolio with International Standard Designations

Our heavy hex nuts are available in a comprehensive range of high-performance materials:

• Precipitation-Hardening Stainless Steels:

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

  • PH 13-8 Mo (UNS S13800): ASTM A564 Type 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). Compliant with NACE MR0175.

• 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 Heavy Hex Nut Manufacturing & Certification

RAYCHIN provides complete custom heavy hex nut manufacturing services tailored to your project's critical needs.

• From Design to Delivery: We produce from your CAD models or detailed drawings.

• Advanced Processing: Capabilities include hot forging, CNC machining, precision threading, and controlled heat treatment.

• Rigorous Quality & Traceability: Every lot includes full Material Test Reports (MTRs) to EN 10204 3.1. We meet AS9100, ISO 9001, PED, and NACE MR0175 requirements.

• Global Standard Compliance: Our nuts are manufactured to meet ASTM A194 (Grade 2H, 7, 8, 8M, etc.), ASME B18.2.2, DIN 934 (Heavy Series), ISO 4032, and other international standards.

Key Industries & Applications

• Oil, Gas & Petrochemical (ASTM A194): Pressure vessel flanges, heat exchangers, pipeline connections, wellhead equipment.

• Power Generation: Turbine casings, boiler supports, nuclear component assemblies.

• Chemical Processing: Reactor closures, high-pressure piping, pump and valve assemblies.

• Aerospace & Defense: Engine mounts, landing gear, and other high-stress structural points.

• Heavy Construction & Marine: Bridge construction, offshore platform modules, shipbuilding.

Request a Quote for Your Heavy Hex Nut Requirements
Contact RAYCHIN's engineering team with your specifications for a prompt consultation and competitive quotation.

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