S-91771A970 1/4"-20 x 5/8" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Perfect flush mounting capability thanks to the 100° countersink angle and standard flat head profile
- Easy installation and removal with No. 3 Phillips drive design, reducing assembly time and tool wear
- Consistent thread engagement through fully threaded UNC coarse thread design with Class 2A fit for secure fastening
- Broad compatibility with 1/4"-20 thread size and right-hand direction for versatile application across equipment
- Regulatory peace of mind with compliance to ASME B18.6.3, RoHS 3, and REACH standards
Professional Applications & Engineering Value
Engineered for demanding industrial settings, this 1/4"-20 flat head screw delivers critical reliability where vibration resistance and corrosion prevention are paramount. The passivated 18-8 stainless steel material provides excellent durability against moisture, chemicals, and temperature variations, reducing maintenance costs and downtime. Its fully threaded UNC coarse thread design ensures maximum grip in various substrates, while the 100° countersink angle allows for seamless, flush installations in machinery, automotive assemblies, and electronic enclosures. The Phillips drive facilitates quick, secure fastening with standard tools, making it a preferred choice for production lines and field service applications requiring consistent, high-strength performance.
Specification Summary & Compliance
This fastener meets precise dimensional standards with Class 2A thread fit and UNC coarse thread specifications, ensuring interchangeability and reliable performance. Manufactured in compliance with ASME B18.6.3 for mechanical and dimensional consistency. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations for hazardous substances.
