S-93310A110 4-40 x 1/2" ASME B18.3, ASTM F879, MIL-DTL-18240 Thread-Locking Stainless Steel Button Head Hex-Drive Screws
Thread-Locking Stainless Steel Button Head Hex-Drive 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
- Superior vibration resistance with nylon patch thread locker, preventing loosening in high-stress environments
- Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial conditions
- High tensile strength of 70,000 psi ensures reliable performance under heavy mechanical loads
- Precise Class 3A thread fit guarantees secure fastening and superior engagement in mating components
- Wide temperature tolerance (-70° to 250°F) maintains locking performance across extreme operating conditions
- Easy installation and removal with standard 1/16" hex drive and rounded button head design
- Full compliance with major industry standards including ASME B18.3, ASTM F879, and MIL-DTL-18240
Professional Applications & Engineering Value
This 4-40 UNC nylon patch lock screw delivers critical engineering solutions for applications where vibration-induced loosening compromises system integrity. The nylon patch locking mechanism creates consistent friction along the coarse UNC threads, providing reliable vibration resistance without requiring additional locking components. Manufactured from 18-8 stainless steel with Rockwell B55 hardness, these rounded head screws maintain structural integrity in corrosive environments while offering excellent tensile strength for demanding industrial assemblies. The combination of Class 3A thread fit and fully threaded design ensures maximum engagement in machinery, electronic enclosures, and precision equipment where secure fastening is paramount to operational safety and longevity.
Specification Summary & Compliance
This fastener features precision 4-40 UNC coarse threads with Class 3A fit for superior thread engagement. Manufacturing complies with ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial components.
