S-97345A571 1/4"-20 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 industrial environments and extended service life.
- High mechanical strength and reliability offering 70,000 psi tensile and 35,000 psi shear strength for demanding applications.
- Precise Class 3A thread fit ensures secure, vibration-resistant fastening with 1/4"-20 UNC coarse threads.
- Easy and secure installation with a knurled socket head and 5/32" hex drive, preventing tool slippage.
- Accurate shoulder dimensions with controlled tolerances for consistent alignment and bearing surfaces.
- Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and safety.
- Durable right-hand coarse threading provides quick assembly and high resistance to loosening under stress.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and assembly jigs. The Class 3A thread fit and UNC coarse threads deliver exceptional clamping force and vibration resistance, reducing maintenance needs in dynamic environments. The knurled socket head with a 5/32" hex drive allows for reliable torque application, minimizing installation errors. Its high tensile strength (70,000 psi) and corrosion-resistant material make it suitable for applications in chemical processing, marine equipment, and food machinery, where durability and hygiene are paramount. The precisely machined shoulder provides stable pivoting or spacing, ensuring accurate component alignment and long-term operational integrity.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit and coarse thread spacing, ensuring tight tolerances and reliable performance. The shoulder diameter is 5/16" with a tolerance of -0.004" to -0.002", and shoulder length is 3/8" with a tolerance of -0.005" to 0.005". It conforms to ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its suitability for restricted substance-controlled industries.
