S-97345A252 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 chemical exposure
- Precise component alignment ensured by the 2-1/2" shoulder with tight diameter tolerance for stable rotational movement
- High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications
- Secure, non-slip installation with knurled socket head and hex drive for reliable torque transfer and reduced tool slippage
- Consistent thread engagement provided by Class 3A thread fit and UNC coarse thread for vibration resistance and easy assembly
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety
- Durable long-term operation supported by Rockwell B79 hardness and corrosion-resistant material properties
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw delivers critical engineering value in applications requiring precise shaft alignment and rotational stability. The 2-1/2" shoulder length with controlled diameter tolerance provides an exact bearing surface for moving components in machinery, reducing wear and maintaining alignment under load. The 1/4"-20 UNC coarse thread with Class 3A fit ensures secure fastening in high-vibration environments common in industrial equipment, while the knurled socket head prevents tool slippage during installation in confined spaces. Ideal for precision assemblies in robotics, conveyor systems, and manufacturing equipment where corrosion resistance and dimensional accuracy are paramount for reliable performance and reduced maintenance intervals.
Specification Summary & Compliance
This shoulder screw features precision dimensions including 1/4"-20 UNC thread with Class 3A thread fit, 3/4" thread length, and 2-1/2" shoulder length with diameter tolerance of -0.004" to -0.002". Manufactured to ASME B18.3 specifications with 70,000 psi tensile strength and Rockwell B79 hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for industrial use.
