S-93996A531 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
- Vibration-resistant locking with nylon patch thread locker ensures secure fastening in high-motion environments from -70° to 250°F
- Exceptional corrosion resistance from 18-8 stainless steel construction for long service life in harsh industrial conditions
- Precise shoulder fit with tight diameter tolerance (-0.001" to 0") enables accurate component alignment and reduced assembly play
- High tensile strength of 70,000 psi provides reliable performance under heavy mechanical loads
- Optimized drive engagement with hex socket head design allows for high torque application and reduced stripping risk
- Standardized UNC coarse threading with Class 2A fit ensures compatibility and easy installation across industrial equipment
- Environmental compliance with RoHS 3 and REACH regulations meets global manufacturing standards
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw delivers critical engineering solutions where precise component positioning and vibration resistance are paramount. The 1/8" shoulder diameter with precise fit tolerance provides accurate alignment for rotating assemblies, bearings, and linkages, eliminating the need for additional spacers. Manufactured from 18-8 stainless steel, it maintains integrity in corrosive environments while the integrated nylon patch thread locker prevents loosening under continuous vibration in machinery, automotive, and aerospace applications. The hex socket head design enables high-torque installation in confined spaces, making it ideal for precision equipment where reliability and dimensional accuracy are non-negotiable.
Specification Summary & Compliance
This precision shoulder screw features 4-40 UNC coarse threading with Class 2A thread fit for standardized compatibility. The shoulder maintains precise diameter tolerance of -0.001" to 0" and length tolerance of 0" to 0.002" for engineering accuracy. Manufactured to industry standards using 18-8 stainless steel with Rockwell B55 hardness, the fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
