S-97832A322 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 extended service life.
- Exceptional thread reliability with Class 3A fit and UNF fine threads, ensuring vibration resistance and secure fastening.
- High mechanical strength offering 70,000 psi tensile strength and 35,000 psi shear strength for demanding load applications.
- Precision shoulder alignment with a 5/16" diameter and controlled tolerances for accurate component positioning.
- Secure and easy installation featuring a knurled socket head with 5/32" hex drive, preventing tool slippage.
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use.
- Optimized durability with Rockwell B55 hardness, resisting wear and deformation under stress.
Professional Applications & Engineering Value
This 1/4"-28 UNF shoulder screw is engineered to address critical alignment and stability challenges in precision assemblies. The 18-8 Stainless Steel material provides excellent corrosion resistance, making it suitable for machinery, automotive, and electronics exposed to moisture or chemicals. The Class 3A thread fit and fine threads enhance grip in vibrating environments, reducing loosening risks. With a 5/16" shoulder diameter and precise tolerances, it ensures accurate pivoting, spacing, and rotational support in jigs, bearings, and linkages. The knurled socket head allows for secure torque application, streamlining assembly in confined spaces while maintaining industrial reliability.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit per UNF standards, with a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for high precision. It conforms to ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial applications.
