S-95345A027 4-40 x 3/8" 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 with integrated internal-tooth lock washers, preventing loosening in high-motion industrial environments.
- Excellent corrosion resistance from 18-8 stainless steel construction and passivated finish, ideal for harsh or outdoor applications.
- High tensile strength of 70,000 psi ensures reliable performance under significant mechanical stress.
- Secure and efficient installation with Phillips No. 1 drive and standard pan head design for easy tool engagement.
- Precise Class 2A thread fit and coarse UNC threading for quick assembly and reduced cross-threading risk.
- Full threading along the 3/8" length provides maximum grip and holding power in various material thicknesses.
- Durable 410 stainless steel lock washer maintains locking performance and corrosion matching with the screw.
Professional Applications & Engineering Value
These 4-40 UNC coarse thread screws with internal-tooth lock washers are engineered to address critical challenges in machinery, electronics, and automotive assemblies where vibration-induced loosening can lead to equipment failure. The 18-8 stainless steel material and passivated finish provide long-term corrosion resistance, reducing maintenance needs in humid or chemically exposed settings. The rounded pan head and Phillips drive facilitate quick, flush installations without snagging, while the fully threaded design ensures consistent clamping force. Ideal for securing panels, components, and enclosures, these screws deliver reliable fastening that meets rigorous industrial demands for safety and durability.
Specification Summary & Compliance
This product adheres to Class 2A thread fit tolerances and UNC coarse thread standards for consistent performance. Manufacturing and quality are governed by ASME B18.13 specifications. The screws and washers are RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring they are free of hazardous substances and suitable for global industrial and electronic applications.
