S-90600A128 1/4"-20 x 5/8" ASME B18.3 Stainless Steel Button Head Torx Screws
Stainless Steel Button Head Torx 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 18-8 stainless steel construction and passivated finish, ensuring longevity in harsh industrial environments.
- Enhanced torque transmission and reduced cam-out thanks to the T27 Torx drive, providing reliable fastening in high-stress applications.
- Exceptional thread engagement and vibration resistance from Class 3A thread fit and coarse UNC threading, minimizing loosening over time.
- High tensile strength of 60,000 psi and Rockwell B55 hardness for dependable performance under heavy loads.
- Sleek, low-profile rounded button head design that sits flush, reducing snagging and improving aesthetics in assembled products.
- Full threading along the 5/8" length for maximum grip and adjustability in various material thicknesses.
- Compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to industry standards and environmental safety regulations.
Professional Applications & Engineering Value
These 1/4"-20 UNC Torx button head screws are engineered to address common industrial challenges such as corrosion, vibration loosening, and high-torque demands. Made from 18-8 stainless steel with a passivated finish, they resist rust and chemical exposure, making them ideal for machinery, automotive assemblies, and outdoor equipment. The T27 drive and Class 3A thread fit provide precise installation with minimal tool slippage, while the coarse thread spacing ensures quick assembly and reliable holding power in metals and plastics. Their rounded head profile offers a secure, flush fit, reducing protrusion risks in compact designs. Trust these screws for applications requiring durability, regulatory compliance, and efficient torque management.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with Class 3A fit and coarse spacing, ensuring tight tolerances and secure fastening. Dimensions include a head diameter of 0.437", head height of 0.132", and length of 5/8". It meets ASME B18.3 specifications for dimensional accuracy and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and industrial safety standards.
