S-90276A107 4-40 x 5/16" ASME B18.6.3 Steel Round Head Slotted Screws
Steel Round Head Slotted Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
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 harsh industrial environments.
- High tensile strength of 60,000 psi provides reliable load-bearing capacity and reduces the risk of mechanical failure.
- Rockwell B69 hardness offers excellent durability and resistance to wear during repeated assembly and disassembly.
- Class 2A thread fit ensures smooth, precise installation with standard UNC coarse threads for quick and secure fastening.
- Fully threaded design maximizes grip and holding power across the entire 5/16" length for consistent performance.
- Slotted rounded head allows for easy manual or tool-driven installation, reducing assembly time and labor costs.
- Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees adherence to strict quality, safety, and environmental standards.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these 4-40 UNC zinc-plated steel screws address common challenges like corrosion, vibration loosening, and assembly efficiency. The zinc plating forms a protective barrier against moisture and chemicals, extending service life in applications such as machinery, electronics, and automotive components. With a coarse thread and Class 2A fit, they provide quick, reliable fastening in materials where fine threads might strip, reducing installation errors. The rounded head slotted design ensures compatibility with standard tools, streamlining maintenance and repair processes while the fully threaded body distributes stress evenly, minimizing the risk of joint failure under dynamic loads.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy per ASME B18.6.3 standards. Key dimensions include a head diameter of 0.211", head height of 0.086", and length of 5/16". It is manufactured from zinc-plated steel with a right-hand thread direction and meets regulatory requirements including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring safe and environmentally responsible use in global markets.
