S-91273A176 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
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
- Precise component alignment enabled by the 2" shoulder with tight ±0.005" length tolerance
- High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Secure, non-slip installation thanks to the knurled head and hex socket drive design
- Fine thread engagement with 1/4"-28 UNF Class 2A threads providing vibration resistance and reliable fastening
- Enhanced durability from Rockwell B55 hardness, ensuring long service life under mechanical stress
- Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial use
Professional Applications & Engineering Value
This stainless steel shoulder screw is engineered to solve critical alignment challenges in precision machinery, automation systems, and rotating assemblies. The 2" shoulder length with minimal tolerance variation acts as a precise pivot or spacer, eliminating misalignment issues that cause premature wear. The 18-8 stainless steel material provides excellent corrosion resistance in moist or chemical environments, while the UNF fine threads and Class 2A thread fit ensure secure fastening in high-vibration applications. The hex socket knurled head offers superior grip during installation, preventing tool slippage and damage in confined spaces. Ideal for use as alignment pin screws in manufacturing jigs, conveyor systems, and robotic arms, this component delivers reliable performance where dimensional accuracy and structural integrity are paramount.
Specification Summary & Compliance
This shoulder screw maintains Class 2A thread fit per UNF standards with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of ±0.005". Manufactured from 18-8 stainless steel with Rockwell B55 hardness, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements for environmental safety and restricted substance control.
