S-91273A156 1/4"-20 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, ideal for harsh industrial environments
- 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 1-3/4" shoulder with tight diameter and length tolerances
- Secure, non-slip installation with knurled head and 1/8" hex drive for reliable torque transmission
- Quick assembly efficiency through 1/4"-20 UNC coarse threads and Class 2A fit for faster engagement
- Durable, long-lasting performance backed by Rockwell B55 hardness for wear resistance
- Global regulatory compliance with RoHS 3 and REACH standards for safe, sustainable use
Professional Applications & Engineering Value
This socket head shoulder screw is engineered to solve critical alignment and mounting challenges in precision machinery. The 18-8 stainless steel material provides excellent corrosion resistance, making it suitable for food processing, medical equipment, and outdoor applications where moisture is a concern. The 1-3/4" shoulder length with controlled tolerances acts as a precise pivot or axle, eliminating bushing needs and reducing assembly complexity. Combined with UNC coarse threads and Class 2A thread fit, it ensures rapid installation while maintaining positional accuracy in rotating assemblies, jigs, and fixturing systems. The knurled head and hex drive design prevent tool slippage, enhancing worker safety and torque consistency during high-volume production.
Specification Summary & Compliance
This shoulder screw maintains Class 2A thread fit per UNC standards with shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufacturing conforms to industry standards for right-hand coarse threads and dimensional consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and unrestricted industrial use.
