S-93310A540 1/4"-20 x 3/4" 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 ensures reliable fastening in high-stress environments without loosening
• Superior corrosion resistance from 18-8 stainless steel construction maintains integrity in harsh industrial conditions
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precise thread engagement through Class 3A UNC coarse threads provides secure, consistent fastening
• Wide temperature tolerance from -70° to 250°F maintains locking performance across extreme operating conditions
• Easy installation and removal with 5/32" hex drive design for efficient maintenance and assembly
• Full thread coverage along the entire 3/4" length maximizes grip strength and load distribution

Professional Applications & Engineering Value

Engineered for critical fastening applications where vibration resistance and corrosion protection are paramount, these rounded head screws with nylon patch thread locker deliver exceptional performance in manufacturing equipment, automotive assemblies, and industrial machinery. The 18-8 stainless steel construction provides excellent corrosion resistance while maintaining 70,000 psi tensile strength, making these fasteners ideal for environments exposed to moisture, chemicals, or temperature fluctuations. The UNC coarse threads with Class 3A fit ensure rapid installation and reliable engagement, while the permanent nylon locking patch eliminates the need for separate locking washers or adhesives. The button head profile with hex drive combines low-profile aesthetics with practical installation advantages, reducing assembly time in space-constrained applications where traditional hex bolts cannot be used.

Specification Summary & Compliance

These 1/4"-20 x 3/4" rounded head screws feature precision UNC coarse threads with Class 3A fit for optimal engagement and consistent performance. Manufactured to exacting standards including ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, ensuring dimensional accuracy and reliability. The fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications with strict material restrictions.