S-91273A172 1/4"-28 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, ensuring long-term reliability in harsh industrial environments
- Precise alignment and secure positioning through the 1/4" diameter shoulder with tight tolerances, minimizing component movement
- High mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for demanding applications
- Secure, slip-resistant installation with knurled hex socket head and 1/8" drive for reliable torque transmission
- Fine thread precision with 1/4"-28 UNF Class 2A fit providing vibration resistance and superior clamping force
- Consistent performance backed by Rockwell B55 hardness for durability across repeated assembly cycles
- Global compliance assurance meeting RoHS 3 and REACH environmental regulations for international supply chain integration
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw delivers critical engineering solutions where precision alignment and high-strength fastening are paramount. The 3/8" shoulder length acts as a precise pivot or spacer in machinery, jigs, and rotating assemblies, eliminating the need for additional components. The fine UNF thread spacing and Class 2A thread fit ensure vibration-resistant connections in automotive, aerospace, and industrial equipment. The knurled hex socket head provides superior grip during installation, preventing tool slippage in confined spaces. Manufactured from corrosion-resistant 18-8 stainless steel with 70,000 psi tensile strength, it withstands extreme operational stresses while maintaining dimensional stability in high-cycle applications.
Specification Summary & Compliance
This shoulder screw maintains Class 2A thread fit per UNF standards with precise shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental compliance for global industrial applications. The combination of Rockwell B55 hardness and controlled dimensional specifications guarantees consistent performance in precision assembly operations.
