S-90402A104 4-40 x 3/16" ASME B18.13 Steel Pan Head Phillips Screws with External-Tooth Lock Washer
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 corrosion resistance with zinc-plated steel construction, ensuring long-term durability in harsh industrial environments
- Enhanced vibration resistance through integrated external-tooth lock washer design, preventing loosening under dynamic loads
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B69 hardness for reliable performance in demanding applications
- Quick and secure installation with Phillips No. 1 drive and coarse UNC threading for efficient assembly operations
- Precise thread engagement with Class 2A thread fit ensuring consistent performance and reduced cross-threading risks
- Full thread coverage along the 3/16" length provides maximum grip strength across the entire fastener engagement
- Comprehensive compliance with ASME B18.13 standards and environmental regulations for guaranteed quality and safety
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel screws with integrated external-tooth lock washers deliver critical vibration resistance in industrial assemblies where maintaining clamp load is essential. The coarse thread spacing combined with Class 2A thread fit ensures rapid installation while minimizing the risk of cross-threading in production environments. The zinc-plated steel construction provides reliable corrosion protection for applications exposed to moderate environmental conditions. The rounded pan head profile with Phillips drive offers a low-profile solution that accommodates standard tooling while the fully threaded design maximizes engagement in thin materials and tight spaces commonly encountered in electronic enclosures, machinery guards, and automotive components.
Specification Summary & Compliance
This fastener features 4-40 UNC coarse threads with Class 2A tolerance for precise fit and reliable performance. Manufactured to ASME B18.13 specifications with 60,000 psi tensile strength and Rockwell B69 hardness. 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.
