S-91249A108 4-40 x 3/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coated 18-8 stainless steel construction for longevity in harsh environments
• High tensile strength of 70,000 psi ensures reliable fastening under mechanical stress and vibration
• Rockwell B70 hardness provides superior wear resistance and durability for repeated use
• Coarse UNC threads with Class 2A fit enable quick installation and secure holding in various materials
• Fully threaded design maximizes grip length and load distribution across the entire fastener
• Pan head with Phillips No. 1 drive offers a low-profile, flush finish and easy torque application
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 4-40 UNC rounded pan head Phillips screws deliver reliable performance in electronics assembly, machinery, and automotive components. The black-oxide 18-8 stainless steel resists oxidation and chemical exposure, reducing maintenance costs. With a coarse thread and Class 2A fit, they provide rapid insertion and vibration resistance, preventing loosening in dynamic applications. The fully threaded design ensures uniform stress distribution, while the Phillips drive facilitates efficient installation with standard tools, streamlining production workflows.

Specification Summary & Compliance

This screw features precise 4-40 UNC coarse threads with Class 2A tolerance for consistent fit. Manufactured to ASME B18.6.3 specifications, it assures dimensional accuracy and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it meets environmental and safety regulations for global industrial use.