S-95345A422 4-40 x 3/16" ASME B18.13 Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer
Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh environments and extended service life.
- Reliable vibration resistance from the integrated 410 stainless steel external-tooth lock washer, preventing loosening under dynamic loads.
- High-strength performance with 70,000 psi tensile strength, ensuring durability in demanding mechanical assemblies.
- Quick and easy installation using the Phillips No. 1 drive and coarse UNC threading, reducing assembly time and effort.
- Precise thread fit with Class 2A tolerance, providing consistent engagement and reducing the risk of cross-threading.
- Full threading along the 3/16" length for maximum grip and holding power in various material thicknesses.
- Compliance with major industry standards including ASME B18.13, RoHS 3, and REACH, ensuring safety and regulatory acceptance.
Professional Applications & Engineering Value
This 4-40 UNC Rounded Head Phillips Screw with an integrated external-tooth lock washer is engineered to solve critical challenges in industrial and electronic assemblies. Its 18-8 stainless steel construction and passivated finish provide exceptional resistance to corrosion and oxidation, making it suitable for outdoor, marine, and chemical-exposed environments. The coarse thread design and Class 2A fit ensure rapid installation and secure fastening, reducing assembly errors and maintenance needs. Paired with a 410 stainless steel washer, it effectively counters vibration-induced loosening in machinery, automotive components, and consumer electronics, enhancing operational reliability and reducing downtime.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 2A fit for precise dimensional accuracy, a pan-style rounded head with Phillips No. 1 drive, and is fully threaded over a 3/16" length. The assembly includes an external-tooth lock washer with 0.23" OD and 0.018" thickness. It complies with ASME B18.13 specifications for screw and washer assemblies, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use.
