S-91255A553 1/4"-28 x 1/2" 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 with black-oxide coating for extended service life in demanding industrial environments
- Precise Class 3A thread fit ensures reliable, vibration-resistant connections in critical assemblies
- Exceptional 120,000 psi tensile strength provides maximum load-bearing capacity for high-stress applications
- Rockwell C39 hardness rating delivers excellent wear resistance and durability under repeated use
- 5/32" hex drive design enables secure installation with standard tools while preventing stripping
- Fine UNF threading offers superior holding power and improved adjustment precision
- Full compliance with industry standards including ASME B18.3 and ASTM F835 for guaranteed performance
Professional Applications & Engineering Value
This black-oxide alloy steel rounded head screw addresses critical engineering challenges in industrial fastening applications. The Class 3A UNF fine threading provides superior resistance to vibration loosening, making it ideal for precision equipment, machinery assemblies, and automotive components where maintaining torque integrity is essential. The black-oxide surface treatment creates a protective barrier against corrosion while maintaining dimensional stability. With its 120,000 psi tensile strength and Rockwell C39 hardness, this fastener withstands extreme mechanical stresses in heavy-duty applications, from manufacturing equipment to aerospace assemblies. The rounded button head profile combines low-profile aesthetics with practical functionality, reducing snag hazards while the 5/32" hex drive ensures secure installation without cam-out issues.
Specification Summary & Compliance
Manufactured to precise Class 3A thread fit tolerances with 1/4"-28 UNF fine threading and 1/2" length. Fully compliant with ASME B18.3 dimensional specifications and ASTM F835 performance standards. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements for safe industrial use.
