S-91241A112 4-40 x 3/4" ASME B18.13 Stainless Steel Pan Head Phillips Screws with Spring Lock Washer
Stainless Steel Pan Head Phillips Screws with Spring Lock Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior vibration resistance through integrated spring lock washer that maintains clamping force in high-motion environments
- Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life
- High-strength performance delivering 70,000 psi tensile strength for demanding industrial applications
- Reliable thread engagement with Class 2A thread fit ensuring precise installation and consistent performance
- Quick installation efficiency through Phillips drive design and coarse UNC threading for faster assembly
- Durable material hardness rated at Rockwell B80 to withstand repeated use without deformation
- Full-threaded design providing maximum grip length and uniform load distribution
Professional Applications & Engineering Value
This 4-40 UNC stainless steel pan head screw with integrated spring lock washer addresses critical vibration-induced loosening in industrial equipment, machinery, and electronic enclosures. The combination of 18-8 stainless steel material and passivated finish provides excellent corrosion resistance for harsh environments, while the fully threaded design ensures maximum thread engagement and load distribution. The Phillips drive and coarse threading enable rapid installation in production environments, making it ideal for assembly lines requiring both speed and reliability. The 410 stainless steel washer maintains constant tension, preventing back-off in applications subject to continuous vibration or thermal cycling.
Specification Summary & Compliance
This fastener meets Class 2A thread fit tolerances with 4-40 UNC coarse threading and right-hand thread direction. Manufactured to ASME B18.13 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. The screw features a 3/4" length with fully threaded design and incorporates a spring lock washer (0.25" OD, 0.015" thickness) manufactured from 410 stainless steel with passivated finish.
