S-93996A518 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 secure fastening with permanent nylon patch thread locker that maintains integrity from -70° to 250°F
- Exceptional corrosion resistance through 18-8 stainless steel construction for long-term reliability in harsh environments
- Precision alignment capability with 1/8" shoulder diameter and precise shoulder fit for accurate component positioning
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Reliable thread engagement with Class 2A UNC coarse threads ensuring consistent fastening and easy assembly
- Secure socket drive system featuring hex drive design for positive torque transmission and reduced stripping risk
- Environmental compliance assurance meeting RoHS 3 and REACH regulations for global industrial 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 excellent corrosion resistance while maintaining 70,000 psi tensile strength for high-stress applications. The precisely machined 1/8" shoulder diameter ensures accurate component alignment in machinery, automotive, and electronic assemblies where positional accuracy is paramount. The permanent thread locking feature operates across a wide temperature range (-70° to 250°F), making it ideal for environments subject to thermal cycling. These industrial shoulder screws deliver reliable performance in robotics, precision instruments, and manufacturing equipment where vibration resistance and secure fastening are essential for operational safety and reduced maintenance intervals.
Specification Summary & Compliance
This precision shoulder screw features Class 2A thread fit with UNC coarse threads, 5/32" thread length, and precise shoulder dimensions with tight tolerances for accurate assembly. Manufactured to industrial standards with socket head design and hex drive compatibility. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and global market acceptance for industrial fastening applications.
