S-91255A526 1/4"-20 x 1 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
- Exceptional corrosion resistance with black-oxide coating for prolonged service life in harsh industrial environments
- Superior thread engagement with Class 3A precision fit ensuring reliable, vibration-resistant connections
- High tensile strength performance rated at 120,000 psi for demanding structural applications
- Optimized drive efficiency with 5/32" hex drive providing secure torque transmission and reduced cam-out risk
- Enhanced material durability through Rockwell C39 hardened alloy steel construction
- Full-threaded design delivering maximum grip length and uniform stress distribution
- Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards
Professional Applications & Engineering Value
These black-oxide alloy steel rounded head screws deliver critical reliability in industrial assemblies where vibration resistance and corrosion protection are paramount. The Class 3A thread fit ensures precise engagement with mating components, eliminating play in machinery, automotive, and heavy equipment applications. The fully threaded UNC coarse thread design provides superior holding power in both metallic and composite materials, while the button head profile offers a low-profile solution for space-constrained installations. Engineered to withstand extreme mechanical stresses with their 120,000 psi tensile strength, these hex drive screws maintain integrity in high-vibration environments where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 and ASTM F835 specifications with Class 3A thread fit precision for superior dimensional accuracy. The 1/4"-20 UNC coarse thread with right-hand direction ensures compatibility with standard industrial components. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use across global markets. The combination of Rockwell C39 hardness and 120,000 psi tensile strength validates consistent performance under extreme mechanical loads.
