S-90402A114 4-40 x 3/4" 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: Integrated external-tooth lock washer maintains tight, secure connections in high-motion environments, reducing maintenance needs.
- Enhanced Corrosion Protection: Zinc-plated steel construction provides a durable barrier against rust and wear, extending service life in harsh conditions.
- High Tensile Strength: Rated at 60,000 psi tensile strength and Rockwell B69 hardness for reliable performance under heavy loads.
- Effortless Installation: Phillips No. 1 drive and coarse UNC threads enable quick, straightforward assembly with standard tools.
- Precision Thread Fit: Class 2A thread fit ensures consistent, smooth engagement with nuts and tapped holes, minimizing cross-threading risks.
- Full Thread Engagement: Fully threaded 3/4" length offers maximum grip and adjustability across varied material thicknesses.
- Regulatory Compliance: Meets ASME B18.13 specifications and environmental standards like RoHS 3 and REACH for safe, global use.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these 4-40 UNC zinc-plated steel screws with external-tooth lock washers address critical challenges like vibration-induced loosening and corrosion. The coarse thread design and Class 2A fit facilitate rapid installation in metals and plastics, while the pan head profile and Phillips drive simplify tool access in confined spaces. Ideal for machinery, automotive assemblies, and electrical enclosures, they provide lasting vibration resistance and tensile reliability, reducing downtime and replacement costs. Their compliance with ASME B18.13 ensures interchangeability and quality consistency across projects.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 2A dimensional accuracy for precise fit. It is manufactured from zinc-plated steel and includes a fully threaded 3/4" length, Rockwell B69 hardness, and 60,000 psi tensile strength. Compliance covers ASME B18.13 mechanical standards, RoHS 3 (2015/863/EU), and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability.
