S-90298A635 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
- Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments
- Precise component alignment through Class 3A thread fit and tight shoulder diameter tolerance (±0.001"), reducing assembly errors
- High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness, supporting heavy-duty applications
- Secure tool engagement featuring hex socket drive and knurled head texture for slip-resistant tightening
- Optimized for industrial standards with UNC coarse threads and ASME B18.3 compliance, ensuring interchangeability
- Extended bearing surface with 2-3/4" shoulder length maintaining precise part spacing in rotating assemblies
- Environmental compliance meeting RoHS 3 and REACH regulations for global manufacturing requirements
Professional Applications & Engineering Value
Engineered for precision motion control systems, this stainless steel shoulder screw solves critical alignment challenges in industrial machinery. The 2-3/4" shoulder length provides stable rotational support for bearings, gears, and linkages while the Class 3A thread fit ensures vibration-resistant fastening. The passivated finish on 18-8 stainless steel resists chemical degradation in manufacturing environments, while the knurled head and hex drive design prevent tool slippage during high-torque assembly. Ideal for CNC equipment, automotive jigs, and conveyor systems where precision shoulder screws maintain dimensional stability under continuous operation.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit and UNC coarse threading (5/16"-18). Shoulder diameter maintains ±0.001" tolerance with shoulder length held to ±0.005". Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Mechanical properties include 70,000 psi tensile strength and Rockwell B55 hardness for guaranteed performance.
