S-90402A107 4-40 x 5/16" 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 vibration resistance with an integrated external-tooth lock washer that maintains clamp load in high-stress environments.
- Enhanced corrosion protection through zinc-plated steel construction, extending service life in industrial settings.
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads without fastener failure.
- Easy installation and removal with a No. 1 Phillips drive and fully threaded coarse UNC design for quick assembly.
- Consistent thread engagement due to Class 2A thread fit, providing precise alignment and reduced cross-threading risks.
- Durable material hardness (Rockwell B69) resists wear and deformation during repeated use.
- Compliance with ASME B18.13, RoHS 3, and REACH guarantees quality and environmental safety for global applications.
Professional Applications & Engineering Value
This 4-40 UNC zinc-plated steel screw with an external-tooth lock washer is engineered to address common industrial challenges like loosening under vibration and corrosion in harsh environments. The coarse thread and fully threaded design ensure rapid installation and strong holding power in materials such as metal assemblies and machinery frames. The rounded pan head with Phillips drive allows for efficient torque application, reducing assembly time while the lock washer distributes pressure evenly to prevent back-off. Ideal for vibration-resistant applications in automotive, electronics, and heavy equipment, this fastener combines durability with regulatory compliance to minimize maintenance and downtime.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy, ensuring reliable performance in right-hand threading applications. Manufactured to meet ASME B18.13 specifications, it includes a zinc-plated steel external-tooth lock washer for enhanced security. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable industrial use.
