S-91500A552 1/4"-20 x 2 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Superior durability and extended service life thanks to the passivated finish that enhances surface protection
• High tensile strength of 70,000 psi ensures reliable, secure fastening under heavy loads and vibration
• Precise Class 2A thread fit guarantees smooth installation and consistent engagement in tapped holes
• Easy installation and removal with Phillips No. 3 drive, reducing tool slippage and assembly time
• Versatile partial threading allows for adjustable clamping force and secure grip in various materials
• Full compliance with industry standards including ASME B18.6.3, RoHS, and REACH for safe, regulated use

Professional Applications & Engineering Value

These 316 stainless steel flat head screws are engineered to address critical challenges in demanding industrial settings, such as marine, chemical processing, and food equipment, where corrosion resistance is paramount. The 1/4"-20 UNC coarse thread design ensures rapid installation and robust holding power in soft materials or pre-tapped holes, minimizing cross-threading risks. With a partially threaded shank, they provide optimal clamping without compromising material integrity, while the 82° countersink angle allows for a flush finish, reducing protrusion in assembled components. The passivated finish further enhances longevity by forming a protective oxide layer, making these Phillips drive screws a reliable choice for applications requiring consistent performance under stress and environmental exposure.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 2A thread fit for consistent tolerance and UNC coarse threading per ASME B18.6.3 specifications. It meets regulatory requirements such as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and material restrictions are upheld. Additional attributes include a hardness of Rockwell B80 and a tensile strength of 70,000 psi, supporting reliable performance in industrial fastening applications.