S-97345A534 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 and marine environments.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high stress.
- Precise thread engagement with Class 3A fit and UNC coarse threads ensuring secure, vibration-resistant fastening.
- Easy installation and removal via the 5/32" hex socket drive and knurled head for improved grip and torque application.
- Accurate component alignment with a 5/16" diameter shoulder that provides stable bearing surfaces and reduces wear.
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, global industrial use.
- Enhanced durability with Rockwell B79 hardness, resisting deformation and extending service life in demanding applications.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assembly and machinery. The 1/4"-20 UNC coarse thread with Class 3A fit delivers tight tolerances, minimizing backlash and maintaining alignment in dynamic systems like rotating shafts, pivots, and gear assemblies. The knurled head and hex socket drive facilitate quick maintenance without slippage, while the 5/16" shoulder diameter acts as a reliable spacer or pivot point, reducing friction and component wear. Ideal for industrial fasteners in automotive, aerospace, and manufacturing equipment, it ensures long-term reliability even in corrosive or high-vibration environments, supported by its high tensile and shear strength.
Specification Summary & Compliance
This shoulder screw features precise dimensions, including a shoulder diameter of 5/16" (tolerance: -0.004" to -0.002") and length of 15/32" (tolerance: -0.005" to 0.005"), with Class 3A thread fit for accurate assembly. It adheres to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and quality in industrial applications.
