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.

Square Nuts in Special Alloys | Heavy-Duty & Weld Square Nuts Manufacturer | RAYCHIN

RAYCHIN manufactures square nuts in 25+ exotic alloys: A286, MP35N, Hastelloy, Titanium & more. Forged square nuts, weld nuts compliant with ASME, DIN, ISO standards. Custom alloy square nuts for machinery, rail, and structural applications.

Square Nuts: High-Strength Fasteners for Anti-Rotation & Heavy-Duty Applications

RAYCHIN is a specialized manufacturer of square nuts, robust fasteners designed for applications where high torque, secure anti-rotation locking, and durability are paramount. Unlike hex nuts, the square profile provides greater surface contact for wrenching tools and is inherently resistant to rotation in channels or slots, making them ideal for structural framing, railroad track systems, heavy machinery, wood construction, and industrial furniture. We engineer these nuts from over 25 advanced metal alloys to deliver superior performance in corrosive, high-temperature, and high-wear environments.

Our capabilities include both hot-forged and precision-machined square nuts, compliant with ASME B18.2.2, DIN 557, ISO 4036, and other international standards. We excel at producing custom square nuts directly from your technical drawings.

Square Nut Types & Classifications

1. Standard Square Nuts:

• Heavy Square Nuts (ASME B18.2.2): Thicker and wider, designed for higher load-bearing applications.

• Regular/Square Machine Screw Nuts (DIN 557, ISO 4036): Standard proportions for general use with square head bolts and in T-slots.

• Slotted/Square Castle Nuts: Feature slots for cotter pin insertion to provide positive mechanical locking (often used with square head bolts).

2. Special Application Square Nuts:

• Weld Square Nuts: Designed with projections or specific geometry for easy and strong attachment to metal surfaces via welding, creating a permanent threaded point.

• Flange Square Nuts: Integrate a circular flange at the base for increased load distribution.

• Square Jam Nuts: Thin-profile square nuts used for locking or spacing.

• Custom Square Nuts: Manufactured to your OEM specifications with unique dimensions, special thread types (left-hand, Acme), non-standard hole sizes, or material grades.

Full Material Portfolio with International Standard Designations

We produce square nuts in a comprehensive range of high-performance materials to meet specific environmental and mechanical challenges.

• Precipitation-Hardening Stainless Steels:

  • 17-4 PH (UNS S17400): ASTM A564 Type 630, AMS 5643, DIN 1.4542 (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 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 Square Nut Manufacturing & Quality Assurance

RAYCHIN provides engineered solutions for demanding square nut applications.

• Hot Forging Expertise: For high-strength requirements, we hot-forge square nuts to achieve superior grain flow and mechanical properties.

• Precision Machining: For intricate designs or tight tolerances, we utilize CNC machining and broaching to create precise square profiles and thread forms.

• Material & Processing Control: We select and process alloys to achieve targeted properties, from the corrosion resistance of Alloy 20 to the ultra-high strength of MP35N.

• Full Certification & Traceability: Each order is supported by complete Material Test Reports (MTRs to EN 10204 3.1). Our quality system meets ISO 9001, AS9100, and industry-specific standards.

• Global Standard Compliance: Our square nuts are produced to ASME B18.2.2, DIN 557, ISO 4036, ASTM A563, and other relevant international specifications.

Key Industries & Applications

• Heavy Machinery & Industrial Equipment: T-slot fastening on machine beds, presses, and assembly jigs.

• Railroad & Transportation: Track fastening systems, railcar construction, and associated hardware.

• Structural Steel & Construction: Used with square head bolts in timber and steel framing, bridge construction, and heavy-duty anchoring.

• Agricultural & Mining Equipment: High-vibration, high-load assemblies requiring secure, anti-rotation fastening.

• Furniture & Woodworking: Traditional and industrial-style furniture where square nuts are used with bolts in channels.

Secure Your Heavy-Duty Assembly with RAYCHIN Square Nuts
Contact our engineering team with your specifications for material, strength, and application environment. Request a quote for standard or custom square nuts.

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