S-91255A535 1/4"-20 x 3/8" ASTM F835 Steel Button Head Hex-Drive Screws
Steel Button Head Hex-Drive 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 from black-oxide alloy steel, ideal for harsh industrial environments
- Exceptional tensile strength of 120,000 psi ensures reliable, long-lasting fastening under high stress
- Precision Class 3A thread fit provides consistent engagement and reduces cross-threading risks
- Fully threaded coarse UNC design offers faster installation and improved vibration resistance
- Low-profile rounded button head with 5/32" hex drive allows for flush mounting and easy access in confined spaces
- High Rockwell C39 hardness maintains thread integrity and prevents stripping during repeated use
- Comprehensive compliance with ASME B18.3, ASTM F835, RoHS 3, and REACH ensures material safety and interchangeability
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 1/4-20 UNC hex drive button head screws address critical fastening challenges in machinery, automotive, and equipment assembly. The black-oxide alloy steel construction provides enhanced corrosion resistance, reducing maintenance needs in humid or chemically exposed environments. With a fully threaded coarse UNC design and Class 3A thread fit, these screws deliver superior vibration resistance and prevent loosening in dynamic load conditions. The rounded button head profile and 5/32" hex drive enable secure installation in recessed or space-constrained areas, while maintaining a clean, flush finish that meets aesthetic and safety requirements across various engineering sectors.
Specification Summary & Compliance
This 1/4-20 UNC screw features a Class 3A thread fit for precision tolerance, coarse thread spacing, and fully threaded right-hand orientation. Manufacturing adheres to ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and mechanical consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances for safe industrial use.
