S-97768A424 5/16"-18 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 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments
- Precise alignment and positioning thanks to the 1/2" shoulder diameter with tight tolerances (-0.004" to -0.002") for stable component mounting
- High mechanical reliability with 70,000 psi tensile strength and 35,000 psi shear strength to withstand demanding loads
- Secure installation and removal using the 1/4" hex drive socket head with knurled texture for enhanced grip
- Consistent thread engagement with Class 3A UNC coarse threads ensuring reliable fastening in right-hand applications
- Extended service life from Rockwell B55 hardness, providing excellent wear resistance and durability
- Regulatory compliance assurance meeting ASME B18.3 standards, RoHS 3, and REACH for global industrial use
Professional Applications & Engineering Value
This 5/16"-18 UNC shoulder screw delivers critical engineering value in precision machinery, automation systems, and rotating assemblies where exact alignment is paramount. The 1/2" shoulder diameter with controlled tolerances acts as a precise pivot or spacer, eliminating misalignment issues in industrial fasteners. Manufactured from 18-8 stainless steel with a black oxide finish, it resists corrosion in humid or chemical-exposed environments, while the Class 3A thread fit and coarse thread spacing ensure quick, secure assembly. The knurled socket head enhances tool grip during high-torque applications, reducing slippage and improving workplace safety in maintenance-heavy sectors.
Specification Summary & Compliance
This shoulder screw maintains precise dimensional control with a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Thread specifications include 5/16"-18 UNC coarse threads with Class 3A fit for superior engagement. It is manufactured in compliance with ASME B18.3 standards and is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to international safety and environmental regulations.
