S-97345A552 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 for reliable performance in harsh industrial environments
- Precise component alignment through the 3" shoulder with tight diameter tolerance (-0.004" to -0.002") ensuring consistent assembly
- Enhanced torque transmission with Class 3A thread fit providing superior engagement and vibration resistance
- Exceptional mechanical strength delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Secure installation and removal with knurled socket head and 5/32" hex drive preventing tool slippage
- Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards (RoHS 3, REACH)
- Optimized fine thread design with 1/4"-28 UNF configuration offering better tension control in thin materials
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw delivers critical engineering solutions where precision alignment and corrosion resistance are paramount. The 3" precision shoulder maintains exact component spacing in assemblies, while the Class 3A UNF fine thread ensures secure fastening in applications subject to vibration. The knurled socket head provides positive grip for installation in confined spaces, and the Rockwell B79 hardness guarantees durability in high-cycle operations. Ideal for precision machinery, automotive fixtures, and electronic enclosures, this shoulder screw combines corrosion-resistant properties with high tensile strength to solve alignment and durability challenges in industrial settings.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for superior precision. Features include: 1/4"-28 UNF fine thread, 3" shoulder length with -0.005" to 0.005" tolerance, and shoulder diameter tolerance of -0.004" to -0.002". Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include 70,000 psi tensile strength and Rockwell B79 hardness rating.
