S-90402A109 4-40 x 7/16" 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-lasting performance in demanding industrial environments.
- Enhanced vibration resistance through the integrated external-tooth lock washer, preventing loosening under dynamic loads.
- High tensile strength of 60,000 psi and Rockwell B69 hardness for reliable load-bearing in heavy-duty applications.
- Effortless installation with Phillips No. 1 drive and coarse UNC threads, reducing assembly time and tool wear.
- Precise Class 2A thread fit for consistent engagement and reduced risk of cross-threading in repetitive use.
- Full compliance with ASME B18.13, RoHS 3, and REACH for guaranteed quality and environmental safety in global supply chains.
- Versatile pan head design with standard rounded profile, providing a flush finish and even clamping force distribution.
Professional Applications & Engineering Value
Engineered for industrial reliability, these 4-40 UNC zinc-plated steel screws address critical challenges in machinery assembly, electronics enclosures, and automotive components. The fully threaded design and coarse thread spacing ensure rapid installation and high pull-out resistance, while the external-tooth lock washer eliminates the need for additional anti-vibration hardware. With a Rockwell B69 hardness and 60,000 psi tensile strength, they withstand cyclic stresses and harsh conditions, making them ideal for heavy-duty fastening where durability and regulatory compliance are paramount. The Phillips drive and right-hand thread simplify maintenance, reducing downtime in production lines.
Specification Summary & Compliance
This screw maintains Class 2A thread fit per UNC standards, ensuring dimensional accuracy for consistent performance. Manufactured in compliance with ASME B18.13 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and global industrial applications. Key dimensions include a 7/16" length, #1 Phillips drive, and 0.23" washer OD for secure fastening.
