S-91255A281 12-24 x 5/8" 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
- Exceptional corrosion resistance with Black-Oxide coating on Alloy Steel, extending service life in demanding environments
- Superior tensile strength (120,000 psi) and hardness (Rockwell C39) for reliable performance in high-stress applications
- Precise Class 3A thread fit ensures secure, vibration-resistant fastening with reduced risk of loosening
- 5/32" hex drive design provides easy installation and high torque transmission without stripping
- Fully threaded body offers maximum grip and holding power along the entire 5/8" length
- Coarse UNC threading enables quick assembly and superior performance in softer materials
- Compliance with ASME B18.3 and ASTM F835 standards guarantees consistent quality and engineering reliability
Professional Applications & Engineering Value
This 12-24 UNC thread screw delivers critical engineering value through its Black-Oxide Alloy Steel construction, providing enhanced corrosion protection where moisture or chemicals are present. The rounded button head with hex drive offers a low-profile, flush-mounting solution that prevents snagging while allowing high-torque installation. With Class 3A thread fit and coarse thread spacing, these screws maintain secure connections in vibrating machinery, automotive assemblies, and heavy equipment where loosening could cause operational failures. The combination of 120,000 psi tensile strength and full threading ensures maximum load distribution, making these industrial screws ideal for structural applications requiring repeated disassembly and reassembly without performance degradation.
Specification Summary & Compliance
This fastener features precision 12-24 UNC coarse threads with Class 3A fit for superior engagement and dimensional accuracy. Manufactured to ASME B18.3 and ASTM F835 specifications, ensuring consistent quality and performance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications with strict material restrictions.
