S-91500A542 1/4"-20 x 1" 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 like marine or chemical processing
• High tensile strength of 70,000 psi ensures reliable load-bearing capacity and reduces risk of fastener failure in demanding applications
• Rockwell B80 hardness provides superior durability and resistance to wear, extending service life in high-vibration settings
• Fully threaded 1/4"-20 UNC coarse design allows for faster installation and stronger grip in various materials
• Passivated finish enhances surface protection against oxidation and improves compatibility with sensitive assemblies
• 82° countersink angle and flat head profile enable flush mounting for sleek, safe surfaces in machinery and equipment
• Phillips No. 3 drive offers common tool compatibility and efficient torque transfer during installation

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver critical performance in industries where corrosion resistance and structural integrity are paramount. The passivated finish and UNC coarse threads work synergistically to prevent galling and seizing, even in high-moisture or chemical-exposure scenarios like marine equipment, food processing machinery, and outdoor infrastructure. Engineers value the Class 2A thread fit for consistent engagement without binding, while the fully threaded design maximizes pull-out strength in sheet metal, plastics, and assembled components. This combination addresses common failure points—such as stress corrosion cracking and installation inefficiencies—making these Phillips drive screws a trusted solution for maintenance, OEM production, and industrial fastening applications requiring long-term reliability.

Specification Summary & Compliance

This screw features precise 1/4"-20 UNC coarse threads with Class 2A fit for standard tolerance and interchangeability. Manufacturing adheres to ASME B18.6.3 specifications, ensuring dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of restricted hazardous substances and safe for use in regulated markets.