S-97832A326 1/4"-28 ASME B18.3 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and washdown applications.
- Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance under high stress.
- Precise component alignment and rotation enabled by the precision-ground 1-1/4" shoulder with tight diameter tolerance. li>Secure, non-slip fastening thanks to the knurled head and 5/32" hex socket drive for superior torque application.
- Vibration-resistant fine threading with a Class 3A UNF thread fit, ensuring a secure, tight connection in dynamic assemblies.
- Broad industry compatibility as it meets ASME B18.3 specifications, ensuring dimensional interchangeability.
- Environmentally responsible manufacturing with compliance to RoHS 3 and REACH regulations.
Professional Applications & Engineering Value
This precision shoulder screw is engineered to act as both an axle and a fastener, solving critical alignment and pivot point challenges in mechanical assemblies. The 1/4"-28 UNF fine thread and Class 3A fit provide exceptional resistance to loosening under vibration, making it ideal for motors, gearboxes, and robotics. The unthreaded 1-1/4" shoulder length offers a durable, precisely machined bearing surface for gears, pulleys, and linkages, minimizing wear and ensuring smooth rotation. Manufactured from 18-8 Stainless Steel with a Rockwell B55 hardness, it delivers excellent corrosion resistance and durability in demanding industrial, automotive, and food processing equipment.
Specification Summary & Compliance
This shoulder screw features a 1/4"-28 UNF thread with a Class 3A fit for high-precision assembly. The shoulder diameter is held to a tight tolerance of -0.004" to -0.002" and the shoulder length to -0.005" to 0.005". It is manufactured in accordance with ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards.
