S-92012A521 4-40 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 strength and durability with alloy steel construction and 140,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments
- Precise shoulder fit with minimal diameter tolerance (-0.001" to 0") ensuring accurate alignment and reduced assembly vibration
- Optimized thread engagement with Class 2A UNC coarse threads providing secure fastening and resistance to loosening under vibration
- Easy installation and removal with hex socket drive design allowing high torque application in confined spaces
- Consistent hardness performance with Rockwell C32 rating maintaining structural integrity under repeated loads
- Compliance with environmental regulations including RoHS 3 and REACH for global manufacturing acceptance
Professional Applications & Engineering Value
This 4-40 UNC alloy steel shoulder screw delivers critical engineering solutions where precise component alignment and rotational control are paramount. The black oxide finish provides essential corrosion protection for machinery operating in humid or chemically aggressive environments, while the precise shoulder diameter (1/8") with tight tolerances ensures accurate bearing surfaces in assemblies requiring minimal runout. The coarse UNC threading combined with Class 2A thread fit offers superior vibration resistance in automotive, aerospace, and industrial equipment applications. With 140,000 psi tensile strength and Rockwell C32 hardness, this fastener maintains dimensional stability under heavy cyclic loading, making it ideal for precision linkages, rotating shafts, and positioning mechanisms where failure is not an option.
Specification Summary & Compliance
This shoulder screw features Class 2A thread fit per UNC standards with precise shoulder diameter tolerance of -0.001" to 0" and shoulder length tolerance of 0" to 0.002". Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility while meeting industrial fastener specifications for dimensional accuracy and material performance.
