S-91241A414 4-40 x 5/16" 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.
- Enhanced vibration resistance and secure locking thanks to the integrated 410 stainless steel spring lock washer, preventing loosening under dynamic loads.
- High tensile strength of 70,000 psi and Rockwell B80 hardness for reliable performance in demanding applications.
- Effortless installation and removal with the Phillips No. 1 drive and fully threaded coarse (UNC) design.
- Precise Class 2A thread fit ensures smooth engagement and consistent fastening accuracy.
- Broad regulatory compliance with ASME B18.13, RoHS 3, and REACH, guaranteeing safety and environmental standards.
- Durable pan head design provides a low-profile, rounded head for reduced snagging and improved aesthetics.
Professional Applications & Engineering Value
This 4-40 UNC rounded head screw is engineered to solve critical fastening challenges in industrial settings. The 18-8 stainless steel material and passivated finish offer exceptional resistance to corrosion and oxidation, making it suitable for electronics, machinery, and outdoor equipment. The integrated spring lock washer (made from 410 stainless steel) effectively counters vibration-induced loosening, a common failure point in dynamic assemblies. With a coarse thread and Class 2A fit, it ensures quick installation and reliable hold in various materials, from metal panels to plastic housings. Its fully threaded design and Phillips drive facilitate efficient assembly lines, reducing downtime and maintenance costs in industrial applications.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy. It is manufactured in compliance with ASME B18.13 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, ensuring environmental safety and material integrity. The assembly includes a spring lock washer with a 0.25" OD and 0.015" thickness, both components finished with passivation for enhanced durability.
