S-91249A123 4-40 x 1" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel and black-oxide coating, ideal for harsh industrial environments
• High tensile strength of 70,000 psi ensures reliable performance in demanding applications
• Rockwell B70 hardness provides excellent durability and wear resistance
• Class 2A thread fit guarantees smooth assembly and consistent fastening
• Coarse UNC threads enable quick installation and reduced cross-threading risks
• Fully threaded design offers maximum grip and load distribution across the entire length
• Compliance with ASME B18.6.3, RoHS 3, and REACH ensures safety and regulatory adherence

Professional Applications & Engineering Value

These 4-40 UNC rounded pan head Phillips screws are engineered to address common industrial challenges, such as corrosion and mechanical stress. Made from black-oxide 18-8 stainless steel, they resist rust and chemical exposure, making them suitable for outdoor equipment, marine hardware, and electronic enclosures. The coarse thread design simplifies installation in various materials, reducing assembly time and minimizing thread damage. With a Phillips drive and pan head profile, they provide secure fastening in tight spaces, enhancing structural integrity in machinery, automotive components, and consumer appliances. Their high tensile strength and Rockwell B70 hardness ensure long-term reliability, even under vibration and load fluctuations.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and UNC coarse threads with a size of 4-40, ensuring dimensional accuracy per industry standards. It is manufactured in compliance with ASME B18.6.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its safety for global use.