S-90276A106 4-40 x 1/4" ASME B18.6.3 Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ideal for industrial environments
• Easy installation and removal with standard slotted drive design for straightforward tool compatibility
• Enhanced durability from Rockwell B69 hardness, ensuring long-term performance under stress
• Reliable coarse threading (UNC) providing strong holding power and reduced cross-threading risk
• Consistent fit and interchangeability with Class 2A thread tolerance for precision assembly
• Full threading along the 1/4" length maximizing grip and load distribution in applications
• Compliance with major industry standards including ASME B18.6.3, RoHS 3, and REACH for safe, regulated use

Professional Applications & Engineering Value

This 4-40 UNC zinc-plated steel screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. The rounded head and slotted drive facilitate quick installation in tight spaces, while the coarse thread design ensures secure fastening in materials prone to stripping. Made from zinc-plated steel, it offers excellent protection against rust and wear, making it suitable for machinery, electronics, and automotive components. The fully threaded body and Class 2A fit provide uniform stress distribution, reducing the risk of failure in high-vibration environments. Ideal for B2B procurement, this screw meets rigorous ASME B18.6.3 specifications, ensuring reliability in demanding applications.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and UNC coarse threading with a diameter of 0.112" and length of 1/4". It complies with ASME B18.6.3 manufacturing standards and is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for industrial use.