S-97345A532 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 316 stainless steel construction, ideal for harsh environments and chemical exposure
- High mechanical reliability with 70,000 psi tensile strength and 35,000 psi shear strength for demanding load applications
- Precise alignment and smooth rotation ensured by the 1 1/2" precision shoulder with tight diameter and length tolerances
- Secure, fine-thread engagement with Class 3A UNF thread fit for vibration resistance and minimal backlash
- Easy installation and removal using a standard 5/32" hex drive and knurled head for improved grip
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety
- Versatile industrial use as a reliable shoulder bolt in machinery, pivots, and assemblies requiring exact spacing
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision industrial assemblies. The 1/4"-28 UNF fine thread with Class 3A fit provides exceptional vibration resistance and thread integrity, reducing the risk of loosening in high-stress environments. The 1 1/2" shoulder length with controlled tolerances ensures accurate component alignment and smooth rotational movement, eliminating misalignment and wear in applications like pivoting mechanisms, bearing mounts, and guide posts. Combined with the knurled socket head for secure tool engagement, this fastener delivers reliable performance in corrosive or high-load settings, from food processing to marine equipment.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise UNF threading. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring dimensional accuracy. It is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety standards for industrial use.
