S-93996A523 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 in high-stress environments
- Exceptional corrosion resistance from 18-8 stainless steel construction for long-term reliability in harsh conditions
- High strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Precise shoulder positioning with tight diameter and length tolerances ensuring accurate component alignment
- Wide temperature compatibility from -70° to 250°F for stable performance across diverse operating environments
- Secure hex drive engagement with 5/64" socket head preventing cam-out and ensuring proper installation torque
- Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial applications
Professional Applications & Engineering Value
This precision 4-40 UNC shoulder screw with nylon patch thread locker addresses critical engineering challenges in industrial assembly where vibration loosening compromises system integrity. The 18-8 stainless steel construction provides excellent corrosion resistance while maintaining 70,000 psi tensile strength for high-stress applications. The precisely machined shoulder with tight diameter and length tolerances ensures accurate component positioning in machinery, automation systems, and precision instruments. The permanent thread locking technology eliminates the need for secondary locking components, streamlining assembly processes in automotive, aerospace, and electronic enclosures where reliable fastening under thermal cycling and mechanical vibration is paramount.
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". Manufactured from 18-8 stainless steel with Rockwell B55 hardness and 70,000 psi tensile strength. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial applications worldwide.
