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.

Shoulder Bolts | Precision Stripper Bolts & Shoulder Screws in Special Alloys | RAYCHIN Manufacturer

RAYCHIN manufactures precision shoulder bolts in 25+ alloys including 17-4PH, MP35N, Titanium & Hastelloy. Mil-Spec shoulder screws, stripper bolts & custom shoulder fasteners compliant with ASME, DIN, ISO & military standards. Global supplier.

Precision Shoulder Bolts for Alignment, Pivoting & Spacing Applications

RAYCHIN specializes in manufacturing high-precision shoulder bolts (also known as stripper bolts, shoulder screws, or shoulder studs)—critical fasteners featuring an unthreaded shoulder section between the head and threaded portion. This design provides exact pivot points, maintains precise alignment, acts as a wear-resistant axle, and ensures consistent spacing in assemblies. We produce these engineered components from over 25 specialized alloys to meet the most demanding requirements in aerospace, robotics, mold making, medical equipment, and precision machinery industries globally.

Shoulder Bolt Types & Classifications

We manufacture comprehensive shoulder bolt configurations to address diverse technical requirements:

1. Standard Shoulder Bolts:

• Hex Head Shoulder Bolts: Feature a hexagonal head for standard wrenching, manufactured to ASME B18.3, DIN 653, and ISO 7379 specifications.

• Socket Head Shoulder Bolts: Incorporate an internal hex drive (Allen) for compact installations, compliant with ASME B18.3, DIN 912, and ISO 4762 standards.

• 12-Point Flange Head Shoulder Bolts: Provide high torque capability for aerospace and racing applications, meeting NASM 25027 and MS 33675 standards.

2. Special Application Shoulder Bolts:

• Stripper Bolts: Specifically designed for mold and die industries to eject parts, with precision-ground shoulders for smooth operation in injection molds and stamping dies.

• Shoulder Pins & Dowel Pins: Fully unthreaded or partially threaded precision pins for alignment and locating, per ISO 8734 and DIN 6325.

• Stepped Shoulder Bolts: Feature multiple shoulder diameters for complex assembly interfaces.

• Custom Shoulder Designs: Manufactured to exact OEM specifications with non-standard diameters, lengths, threads, and tolerances.

Material Grades & International Standard Specifications

Our shoulder bolts are precision-machined from the following advanced material systems with full international standard compliance:

1. Precipitation-Hardening Stainless Steels:

• 17-4 PH (UNS S17400): Supplied to ASTM A564 Type 630, AMS 5643, DIN 1.4542 in H900, H1025, H1150 tempers for high-strength precision shoulder bolts.

• PH 13-8 Mo (UNS S13800): Manufactured per ASTM A564 Type 625, AMS 5629 for superior strength-toughness combination.

2. Nickel-Based Superalloys:

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

• Monel® Alloys: Monel K500 (UNS N05500/AMS 4676), Monel 400 (UNS N04400) for marine and chemical environments.

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

• Waspaloy (UNS N07001): Per AMS 5708, AMS 5824 for high-temperature turbine shoulder bolts.

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

3. Duplex & Super Duplex Stainless Steels:

• Duplex Steel: Duplex 2205 (UNS S32205) to ASTM A193 B8S, EN 1.4462 specifications.

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

4. Titanium Alloys:

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

• Grade 2 Titanium: UNS R50400 to ASTM B348, AMS 4921 for corrosion-resistant medical shoulder bolts.

5. Refractory & Exotic Metals:

• Tantalum (UNS R05200): ASTM B365, AMS 7845 for highly corrosive chemical applications.

• Zirconium 702 (UNS R60702): ASTM B550, ASME SB550 for sulfuric acid service.

• Molybdenum (UNS R03600) & Tungsten: For extreme temperature and wear-resistant applications.

6. Specialty Alloys:

• Nitronic® Alloys: Nitronic 60 (UNS S21800), Nitronic 50 (UNS S20910) to ASTM A193 B8N for high-strength, galling-resistant shoulder screws.

• 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) for ultra-high strength aerospace shoulder bolts.

• 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 for lightweight precision applications.

8. Pure Nickel & Incoloy:

• Nickel 200 (UNS N02200): ASTM B160, ASME SB160 for high-purity applications.

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

Custom Shoulder Bolt Manufacturing Services

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

• Standards Compliance: ASME B18.3, DIN 653, ISO 7379, NASM 25027, MS 33675, and customer drawings.

• Precision Tolerances: Shoulder diameters held to h6/g6 tolerances, concentricity within 0.005 mm, surface finishes to 0.2 μm Ra.

• Special Features: Knurled shoulders, grooved shoulders, special drives, thread-locking features, heat-treated sections.

• Full Processing: CNC turning, centerless grinding, thread grinding, heat treatment, surface finishing.

• Quality Assurance: Complete MTRs (EN 10204 3.1), dimensional reports, surface roughness testing, compliance with AS9100, ISO 9001, ISO 13485.

Industry Applications

• Aerospace & Defense: Flight control linkages, actuator pivots, guidance system components (NAS, MS standards)

• Medical Equipment: Surgical robot joints, imaging device components, diagnostic machinery

• Mold & Die Industry: Ejector pins, guide pins, stripper bolts for injection molding and stamping dies

• Robotics & Automation: Robotic arm joints, linear guide mounts, precision positioning systems

• Automotive: Transmission linkages, throttle assemblies, precision steering components

• Industrial Machinery: Gear assemblies, printing equipment, textile machinery, packaging equipment

Why Choose RAYCHIN?

• Precision Manufacturing: CNC grinding capabilities for micron-level tolerances

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

• Global Certification: Products meet ASME, DIN, ISO, ASTM, AMS, MIL-SPEC standards

• Engineering Support: Complete design-for-manufacturability analysis

• Global Supply: Reliable supplier to North America, European Union, ASEAN, Middle East markets

• Quality Commitment: 100% dimensional inspection, surface finish verification, material certification

Request Shoulder Bolt Quotation
Contact RAYCHIN for engineering consultation and competitive pricing. Submit your drawings for stripper bolts, precision shoulder screws, or custom shoulder fasteners.

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