S-90403A112 4-40 x 5/8" ASME B18.13 Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer
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 washer that maintains clamping force in high-motion environments
- Exceptional durability through zinc-plated steel construction providing reliable corrosion protection
- High-strength performance with 60,000 PSI tensile strength and Rockwell B69 hardness for demanding applications
- Quick installation with #1 Phillips drive design that prevents cam-out and ensures efficient assembly
- Reliable thread engagement through Class 2A thread fit and coarse UNC threading for secure fastening
- Full-length threading allows maximum adjustment range and holding power along the entire 5/8" length
- Standardized dimensions with rounded pan head profile ensuring compatibility with various applications
Professional Applications & Engineering Value
This 4-40 UNC zinc-plated steel screw with internal-tooth lock washer addresses critical vibration-induced loosening in industrial equipment, machinery, and electronic enclosures. The combination of fully threaded coarse pitch design and Class 2A thread fit ensures rapid assembly while maintaining precise tolerances. The zinc-plated steel construction provides essential corrosion resistance for harsh environments, while the rounded pan head with #1 Phillips drive offers both aesthetic appeal and practical installation benefits. Engineered to withstand repetitive stress cycles, these industrial screws deliver reliable performance in automotive, manufacturing, and electrical applications where vibration resistance is paramount.
Specification Summary & Compliance
Manufactured to exacting ASME B18.13 specifications with Class 2A thread fit and UNC coarse threading. Features include 4-40 thread size, 5/8" fully threaded length, and zinc-plated steel construction throughout both screw and internal-tooth lock washer components. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
