S-93705A120 4-40 x 3/8" ASME B18.3 18-8 Stainless Steel Thread-Locking Socket Head Screws
18-8 Stainless Steel Thread-Locking Socket Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Vibration-resistant locking with nylon patch thread locker maintains secure fastening in temperatures from -70° to 250°F
- Superior corrosion resistance from 18-8 stainless steel construction ensures long-term reliability in harsh environments
- Precise Class 3A thread fit delivers exceptional assembly accuracy and reduced cross-threading risk
- High tensile strength of 70,000 psi provides reliable performance under heavy mechanical loads
- Standard hex drive compatibility allows for easy installation with common 3/32" hex tools
- Coarse UNC threading enables rapid assembly and disassembly in industrial applications
- Full threading along the 3/8" length offers maximum adjustment flexibility and grip strength
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 4-40 UNC thread socket head cap screws solve critical fastening challenges where vibration resistance and corrosion protection are paramount. The 18-8 stainless steel construction combined with the nylon patch thread locker creates a reliable solution for machinery, automotive components, and electronic enclosures subject to thermal cycling and mechanical stress. The Class 3A thread fit ensures precise engagement in tapped holes, reducing installation errors and improving production efficiency. With their coarse thread spacing and fully threaded design, these screws provide superior holding power in both soft and hard materials, making them ideal for assembly lines requiring consistent, high-quality fastening performance.
Specification Summary & Compliance
This socket head cap screw features 4-40 UNC coarse threads with Class 3A precision fit and meets ASME B18.3 manufacturing specifications. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. Manufactured from 18-8 stainless steel with Rockwell B70 hardness and 70,000 psi tensile strength, it delivers consistent performance within specified dimensional tolerances for reliable integration into professional applications.
