S-91241A418 4-40 x 7/16" 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 corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
- Reliable vibration resistance thanks to the integrated 410 stainless steel spring lock washer, preventing loosening under dynamic loads.
- High mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for demanding applications.
- Effortless installation with No. 1 Phillips drive and fully threaded 4-40 UNC coarse thread design for quick, secure fastening.
- Precise thread fit with Class 2A tolerance ensuring consistent engagement and reduced cross-threading risks.
- Compliance with major standards including ASME B18.13, RoHS 3, and REACH for guaranteed quality and environmental safety.
- Durable washer integration featuring a 0.25" OD spring lock washer that maintains locking performance over repeated use.
Professional Applications & Engineering Value
This 4-40 UNC rounded head Phillips screw with an integrated spring lock washer is engineered to solve critical fastening challenges in industrial settings. The 18-8 stainless steel material, combined with a passivated finish, provides exceptional resistance to corrosion and oxidation, making it suitable for machinery, electronic enclosures, and outdoor equipment. The coarse UNC thread and Class 2A fit ensure rapid assembly with minimal risk of stripping, while the spring lock washer actively counters vibration-induced loosening—a common failure point in dynamic systems. Fully threaded for maximum grip, these screws deliver reliable performance in high-tensile applications where durability and compliance with ASME B18.13 standards are non-negotiable.
Specification Summary & Compliance
The screw features a 4-40 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy. It is manufactured in accordance with ASME B18.13 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. The spring lock washer, made from 410 stainless steel with a passivated finish, complements the screw's performance in regulated industrial applications.
