S-90298A639 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 passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Precise component alignment thanks to the 3/8" shoulder diameter with tight ±0.001" tolerance for reliable positioning
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Secure, vibration-resistant assembly from Class 3A thread fit and coarse UNC threads ensuring consistent clamping force
- Easy installation and removal with hex socket drive and knurled head for improved grip during tool operation
- Long-term reliability backed by compliance with ASME B18.3, RoHS 3, and REACH standards
- Versatile mounting solutions with 3 3/4" shoulder length providing stable bearing surfaces for rotating components
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw delivers critical engineering value in precision machinery and automation systems. The passivated finish provides enhanced corrosion protection, making it suitable for manufacturing environments exposed to moisture or chemicals. Its 3/8" shoulder diameter with exceptional dimensional stability (±0.001" tolerance) ensures precise alignment of moving parts in assemblies, reducing wear and maintaining operational accuracy. The Class 3A thread fit and coarse UNC threads offer superior resistance to vibration loosening in high-stress applications. These shoulder screws are engineered to serve as reliable axles, pivots, and mounting points in robotics, conveyor systems, and precision equipment where dimensional accuracy and corrosion resistance are paramount.
Specification Summary & Compliance
This precision shoulder screw features 5/16"-18 UNC coarse threads with Class 3A thread fit for tight tolerances. The shoulder maintains 3/8" diameter with -0.001" to 0.001" tolerance and 3 3/4" length with -0.005" to 0.005" tolerance. Manufactured to ASME B18.3 specifications and compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring both dimensional precision and regulatory compliance for industrial applications.
