S-93310A646 3/8"-16 x 1 1/4" ASME B18.3, ASTM F879, MIL-DTL-18240 Thread-Locking Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch that maintains secure fastening from -70° to 250° F, preventing loosening in demanding environments
• Superior corrosion resistance from 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial conditions
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precise thread engagement with Class 3A thread fit and UNC coarse threading for reliable installation and removal
• Easy installation and removal with 7/32" hex drive and rounded button head design requiring minimal clearance
• Full threading capability providing consistent holding power along the entire 1-1/4" length
• Industry compliance assurance meeting ASME B18.3, MIL-DTL-18240, and ASTM F879 specifications

Professional Applications & Engineering Value

These nylon patch lock rounded head screws deliver exceptional engineering value in applications where vibration resistance and reliable fastening are critical. The 18-8 stainless steel construction provides excellent corrosion resistance while maintaining structural integrity, making them ideal for machinery, equipment manufacturing, and industrial assemblies exposed to harsh environments. The permanent nylon patch locking technology embedded in the UNC coarse threads creates consistent friction that prevents back-out without damaging mating threads, solving common vibration-induced loosening problems. The combination of Class 3A thread fit precision and 70,000 psi tensile strength ensures these hex drive screws maintain clamping force under dynamic loads, while the rounded button head profile offers a clean, low-profile appearance with reduced risk of snagging in tight spaces.

Specification Summary & Compliance

This 3/8"-16 x 1-1/4" fully threaded screw features precision Class 3A thread fit with UNC coarse threading and meets ASME B18.3 dimensional standards. Manufactured in compliance with MIL-DTL-18240 and ASTM F879 specifications, ensuring consistent quality and performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental and safety regulations for industrial use worldwide.