S-97345A593 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 environments and chemical exposure
- Enhanced load-bearing capacity from 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Precise component alignment ensured by the 1-1/2" shoulder with tight diameter tolerance
- Secure, non-slip installation with knurled head and 5/32" hex drive for reliable torque transmission
- Consistent thread engagement through Class 3A fit and 1/4"-20 UNC coarse threads for vibration resistance
- Broad regulatory compliance meeting ASME B18.3 standards, RoHS 3, and REACH for global industrial use
- Optimized durability with Rockwell B79 hardness providing excellent wear resistance in mechanical assemblies
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw delivers critical performance in precision machinery, automation systems, and marine equipment where corrosion resistance and structural integrity are paramount. The 1-1/2" shoulder length with controlled diameter tolerance provides accurate pivot points and bearing surfaces in rotating assemblies, eliminating misalignment issues. Its Class 3A thread fit and UNC coarse threads maintain clamping force under vibration, while the knurled socket head ensures secure tool engagement during installation. Engineered to ASME B18.3 specifications, this fastener solves alignment challenges in conveyor systems, robotic arms, and packaging equipment where precise component positioning is essential.
Specification Summary & Compliance
Manufactured to ASME B18.3 standards with Class 3A thread fit for precision engagement. Features 1/4"-20 UNC coarse threads, 1-1/2" shoulder length (±0.005" tolerance), and 5/16" shoulder diameter (-0.004" to -0.002" tolerance). Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include 70,000 psi tensile strength, 35,000 psi shear strength, and Rockwell B79 hardness.
