S-90988A016 4-40 x 1/2" FF-S-92, MS51957-17 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh environments and extended service life
• High tensile strength of 80,000 PSI ensures reliable fastening under stress, reducing the risk of mechanical failure
• Fully threaded UNC coarse spacing provides faster installation and stronger holding power in a variety of materials
• Class 2A thread fit guarantees consistent, precise engagement for smooth assembly and reduced cross-threading
• Pan head with Phillips No. 1 drive offers a low-profile, secure fit and common tool compatibility for efficient maintenance
• Compliance with Fed. Spec. FF-S-92 (MS51957-17) ensures adherence to rigorous industrial standards for quality and performance
• RoHS 3 and REACH compliant for environmentally safe use in global markets and sensitive applications

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 4-40 UNC screws with Black-Oxide 18-8 Stainless Steel construction address critical challenges like corrosion and vibration loosening. The coarse thread spacing and fully threaded design enhance grip in soft materials or assemblies requiring uniform clamping force, while the rounded pan head and Phillips drive facilitate quick, tool-friendly installation in confined spaces. Ideal for electronics, machinery, and outdoor equipment, they provide long-term reliability by resisting rust and maintaining 80,000 PSI tensile strength, ensuring secure fastening in high-stress applications without frequent replacements.

Specification Summary & Compliance

This screw features a 4-40 UNC thread with Class 2A fit for standard dimensional accuracy, and is manufactured to meet Fed. Spec. FF-S-92 (MS51957-17). It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence.