S-95345A442 4-40 x 5/8" 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
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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 with integrated external-tooth lock washer that maintains clamp force in high-vibration environments
- Excellent corrosion resistance through 18-8 stainless steel construction and passivated finish for extended service life
- High tensile strength of 70,000 psi ensures reliable performance in demanding applications
- Quick installation and removal with Phillips No. 1 drive and rounded pan head design
- Secure fastening through Class 2A thread fit and fully threaded design for maximum engagement
- Industry-standard compatibility with 4-40 UNC coarse threads for broad application use
- Dual-material protection with both screw and washer featuring passivated finishes
Professional Applications & Engineering Value
This 4-40 UNC coarse thread screw with external-tooth lock washer addresses critical vibration-induced loosening in industrial equipment, electronics, and machinery assemblies. The 18-8 stainless steel construction combined with passivated finish provides exceptional corrosion resistance, making it ideal for harsh environments where moisture or chemicals are present. The rounded pan head with Phillips drive offers efficient installation while the integrated locking mechanism prevents back-off under dynamic loads. With 70,000 psi tensile strength and full threading, this fastener delivers reliable clamping force in applications requiring repeated maintenance or exposure to thermal cycling, ensuring long-term joint integrity without compromising performance.
Specification Summary & Compliance
This fastener features Class 2A thread fit with 4-40 UNC coarse threads and 5/8" length. Manufactured to ASME B18.13 specifications, the screw assembly includes an external-tooth lock washer made from 410 stainless steel with matching passivated finish. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
