S-93705A118 4-40 x 1/4" ASME B18.3 18-8 Stainless Steel Thread-Locking Socket Head Screws
18-8 Stainless Steel Thread-Locking Socket Head 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 maintains secure fastening in temperatures from -70° to 250°F
- Exceptional corrosion resistance from 18-8 stainless steel construction ensures long-term reliability in harsh environments
- Precise Class 3A thread fit delivers superior engagement and consistent clamping force in critical applications
- High tensile strength of 70,000 psi provides reliable performance under heavy mechanical loads
- Hex socket drive design allows for high torque application and easy installation in confined spaces
- Full thread coverage ensures maximum grip length and uniform stress distribution
- Industry standard compliance with ASME B18.3 guarantees interchangeability and quality assurance
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 4-40 UNC socket head cap screws provide critical solutions for vibration-prone assemblies and precision equipment. The 18-8 stainless steel construction offers excellent corrosion resistance while maintaining Rockwell B70 hardness for durability. The integrated nylon patch thread locker prevents loosening under dynamic loads, eliminating the need for secondary locking components. With Class 3A thread fit and coarse UNC threads, these fasteners deliver reliable performance in machinery, electronic enclosures, and automotive components where vibration resistance and precise fit are paramount. The hex drive style enables high torque application while the standardized dimensions ensure compatibility with existing tooling and designs.
Specification Summary & Compliance
This socket head cap screw features precision Class 3A thread fit with 4-40 UNC coarse threads and right-hand thread direction. Manufactured to ASME B18.3 specifications with a tensile strength of 70,000 psi. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The fastener includes a standard socket head profile with 3/32" drive size and measures 1/4" in length with full threading.
