S-93996A516 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
- Permanent vibration resistance with nylon patch thread locker that maintains secure fastening from -70° to 250° F
- Exceptional durability from 18-8 stainless steel construction offering excellent corrosion resistance and long service life
- High tensile strength of 70,000 psi ensures reliable performance in demanding industrial applications
- Precise shoulder fit with controlled diameter and length tolerances for accurate component alignment
- Easy installation and removal with standard 5/64" hex socket drive for efficient maintenance
- Consistent thread engagement with Class 2A UNC coarse threads for reliable assembly performance
- Environmental compliance meeting RoHS 3 and REACH regulations for global manufacturing applications
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw with nylon patch thread locker addresses critical vibration-induced loosening challenges in precision assemblies. The 18-8 stainless steel construction provides superior corrosion resistance while maintaining Rockwell B55 hardness for durability in harsh environments. The precisely machined 1/8" shoulder ensures accurate component positioning in machinery, electronics, and automotive applications where alignment is critical. The permanent thread locking technology eliminates the need for additional locking hardware, streamlining assembly processes while providing reliable fastening security from -70° to 250° F temperature ranges. This makes the socket head shoulder screw particularly valuable in applications subject to constant vibration or thermal cycling.
Specification Summary & Compliance
This precision shoulder screw features Class 2A thread fit with UNC coarse threads (4-40) and a 5/32" thread length. The shoulder maintains precise dimensional control with diameter tolerance of -0.001" to 0" and length tolerance of 0" to 0.002". Manufactured from 18-8 stainless steel with 70,000 psi tensile strength and Rockwell B55 hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for global manufacturing applications.
