S-95345A025 4-40 x 5/16" ASME B18.13 Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer
Stainless Steel Pan Head Phillips Screws with Internal-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 through integrated internal-tooth lock washer that maintains clamping force in high-motion environments
- Excellent corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh conditions
- High tensile strength of 70,000 psi ensures reliable performance under significant mechanical stress
- Quick installation and removal with Phillips No. 1 drive and coarse UNC threads for efficient assembly operations
- Secure locking capability provided by 410 stainless steel washer that prevents loosening without damaging mating surfaces
- Full threading design allows for maximum engagement depth and uniform load distribution
- Industry-standard compliance meets ASME B18.13 specifications for consistent quality and interchangeability
Professional Applications & Engineering Value
This 4-40 UNC coarse thread screw with internal-tooth lock washer addresses critical vibration-induced loosening challenges in industrial assemblies. The combination of 18-8 stainless steel construction and passivated finish provides exceptional corrosion resistance for demanding environments including marine, food processing, and outdoor equipment. The pan head design with Phillips drive offers reliable fastening in confined spaces while the 410 stainless steel lock washer maintains joint integrity through thermal cycling and mechanical vibration. Engineered for precision equipment, electronic enclosures, and machinery where vibration resistance and corrosion protection are paramount, this fully threaded fastener ensures consistent clamping force throughout the engagement length.
Specification Summary & Compliance
Manufactured to Class 2A thread fit tolerances with UNC coarse threads for reliable engagement. Complies with ASME B18.13 specifications ensuring dimensional accuracy and performance consistency. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features include 5/16" length, 0.219" head diameter, and fully threaded design with integrated internal-tooth lock washer system.
