S-90298A626 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 passivated finish, ideal for harsh industrial environments
- Precise component alignment ensured by the 1-1/4" shoulder with tight diameter tolerance of -0.001" to 0.001"
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Reliable thread engagement through Class 3A UNC coarse threads providing secure fastening in high-vibration settings
- Easy installation and removal with knurled head and 3/16" hex socket drive preventing tool slippage
- Industry-standard compliance meeting ASME B18.3 specifications for consistent quality and interchangeability
- Environmental regulation adherence with RoHS 3 and REACH compliance for global manufacturing applications
Professional Applications & Engineering Value
This stainless steel shoulder screw delivers critical engineering solutions where precision alignment and rotational control are paramount. The 1-1/4" shoulder length with minimal diameter tolerance provides exact bearing surfaces for gears, pulleys, and linkages, eliminating misalignment issues in automated machinery. The Class 3A UNC coarse thread ensures rapid assembly while maintaining vibration resistance in production equipment. Manufactured from 18-8 stainless steel with passivated finish, it withstands corrosive coolants and industrial washdowns without compromising structural integrity. The combination of 70,000 psi tensile strength and knurled hex socket head makes it ideal for high-torque applications in robotics, conveyor systems, and precision tooling where reliability is non-negotiable.
Specification Summary & Compliance
Manufactured to ASME B18.3 standards with Class 3A thread fit for precision UNC threading. Shoulder diameter maintains -0.001" to 0.001" tolerance with shoulder length tolerance of -0.005" to 0.005". Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Material certification includes Rockwell B55 hardness and 70,000 psi tensile strength verification.
