S-91255A840 5/16"-24 x 1 3/4" 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, extending service life in demanding industrial environments
- Exceptional load-bearing capacity with 120,000 psi tensile strength for critical high-stress applications
- Precision thread engagement through Class 3A fit and UNF fine threading, ensuring vibration-resistant connections
- Optimized installation efficiency with hex drive design providing positive torque transmission and reduced cam-out risk
- Enhanced surface clearance from rounded button head profile, minimizing protrusion in confined spaces
- Full-thread engagement capability along the entire 1¾" length for maximum grip range and adjustment flexibility
- Regulatory compliance assurance meeting international standards for material safety and performance reliability
Professional Applications & Engineering Value
Engineered for precision assemblies requiring high-strength fastening solutions, these black-oxide alloy steel screws deliver exceptional performance in automotive, aerospace, and heavy machinery applications. The Class 3A UNF fine threads provide superior resistance to vibrational loosening while maintaining precise alignment in critical joints. With Rockwell C39 hardness and 120,000 psi tensile strength, these rounded head screws withstand extreme mechanical stresses without compromising integrity. The hex drive configuration ensures reliable torque application during installation, reducing assembly time while preventing damage to the button head design. Ideal for applications where space constraints demand low-profile fasteners without sacrificing structural performance.
Specification Summary & Compliance
Manufactured to ASME B18.3 and ASTM F835 specifications with Class 3A thread fit precision. Features 5/16"-24 UNF fine threading with right-hand orientation and full threading along the 1¾" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The black-oxide alloy steel construction maintains dimensional stability under loads up to 120,000 psi tensile strength with Rockwell C39 hardness rating.
