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.

Jam Nuts in Special Alloys | Thin Nuts & Lock Nuts Manufacturer | RAYCHIN

RAYCHIN manufactures jam nuts (thin nuts) in 25+ exotic alloys: Inconel, Monel, Titanium, Hastelloy, MP35N & more. ASME, DIN, ISO compliant jam nuts for spacing, locking & adjustment. Custom alloy jam nuts for aerospace, chemical & precision engineering.

Jam Nuts: Thin-Profile Fasteners for Locking, Spacing & Precision Adjustment

RAYCHIN is a premier manufacturer of jam nuts, also known as thin nuts or lock nuts. Characterized by their reduced height—typically half the thickness of a standard hex nut—jam nuts serve critical functions in mechanical assembly. They are primarily used as a secondary locking nut against a primary nut, as a spacer to achieve precise positioning, or to secure components in confined spaces where a full-height nut cannot fit. We engineer these versatile components from over 25 specialized alloys to perform reliably in high-temperature, corrosive, and high-vibration environments across aerospace, precision instrumentation, chemical processing, and fluid power industries.

Our jam nuts are manufactured to exacting dimensional and material standards, including ASME B18.2.2, DIN 439, ISO 4035, and ASTM A563, and are available in custom configurations from your technical drawings.

Jam Nut Types & Primary Applications

1. Standard Jam Nuts (Thin Hex Nuts):

• Finished Jam Nuts: Machined to standard specifications for general-purpose locking and spacing.

• Heavy Jam Nuts: A thinner version of the heavy hex nut pattern, used in high-strength bolting applications per ASTM A194 specifications.

2. Special Application Jam Nuts:

• Jam Nuts with Locking Features: Can be combined with prevailing torque elements (e.g., center-lock deformation) for enhanced vibration resistance.

• Precision Ground Jam Nuts: Feature tightly controlled parallelism and thickness for use in precision bearing adjustments and micrometer settings.

• Custom Jam Nuts: Manufactured to your OEM specifications with non-standard thicknesses, special thread tolerances (e.g., Class 3B), unique plating, or exotic material grades.

Full Material Portfolio with International Standard Designations

We produce jam nuts in the following high-performance materials, providing solutions for the most demanding applications.

• Precipitation-Hardening Stainless Steels:

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

  • 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 Jam Nut Manufacturing & Quality Assurance

RAYCHIN provides engineered solutions for specialized jam nut requirements.

• Precision Manufacturing: We achieve exact thickness tolerances and superior thread quality through CNC machining and precision grinding processes.

• Material & Heat Treatment Expertise: We select and process alloys to achieve the required mechanical properties, whether it's high strength in 17-4 PH H900 or corrosion resistance in Hastelloy C276.

• Full Certification & Traceability: Each order is supported by complete Material Test Reports (MTRs to EN 10204 3.1). Our quality system complies with AS9100, ISO 9001, and ITAR as needed.

• Global Standard Compliance: Our jam nuts are produced to ASME B18.2.2, DIN 439, ISO 4035, ASTM A563, and other international specifications.

Key Industries & Applications

• Aerospace & Defense: Control linkage adjustments, bearing pre-load settings, and as locknuts on critical flight hardware.

• Precision Engineering & Instrumentation: Optical equipment, micrometer stops, gauge calibration, and fine-thread adjustment mechanisms.

• Chemical & Process Industries: Valve stem locking, pump shaft adjustments, and assembly in corrosive pipework.

• Fluid Power & Hydraulics: Locking hydraulic fittings and securing components in compact manifolds.

• General Machinery: Any assembly requiring precise axial positioning or a secondary locking mechanism.

Secure Your Precision Assembly with RAYCHIN Jam Nuts
Contact our engineering team to discuss your application's specific requirements for material, tolerance, and function. Request a quote for standard or custom jam nuts today.

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