S-90402A112 4-40 x 5/8" 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, extending service life in demanding industrial environments.
- Reliable vibration resistance due to the integrated external-tooth lock washer, preventing loosening under dynamic loads.
- High tensile strength of 60,000 psi ensures dependable fastening for critical applications requiring robust mechanical performance.
- Consistent thread engagement with fully threaded UNC coarse threads and Class 2A fit, enabling quick assembly and secure holds.
- Easy installation and removal with Phillips No. 1 drive, reducing tool slippage and improving efficiency on the production line.
- Broad material compatibility from the pan head design and coarse threading, suitable for various substrates without stripping.
- Compliance with major industry standards including ASME B18.13, ensuring quality and interoperability in professional settings.
Professional Applications & Engineering Value
Engineered for industrial fastening where vibration and corrosion are common challenges, this zinc-plated steel screw with an external-tooth lock washer provides a durable, maintenance-free solution. The 4-40 UNC coarse thread and Class 2A fit offer excellent grip in metals and plastics, reducing the risk of cross-threading and enabling faster assembly in high-volume production. With a Rockwell B69 hardness and 60,000 psi tensile strength, it withstands heavy loads in machinery, electronics, and automotive assemblies, while the rounded pan head and Phillips drive ensure easy access and secure torque application in confined spaces.
Specification Summary & Compliance
This screw features a 5/8" length with fully threaded UNC coarse threads and Class 2A thread fit for precise dimensional accuracy. It meets ASME B18.13 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.
