S-91255A040 5/16"-24 x 1 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
- Exceptional tensile strength of 120,000 psi for reliable performance in high-stress industrial environments.
- Superior corrosion resistance with black-oxide coating, extending service life in harsh conditions.
- Precise Class 3A thread fit ensures secure, vibration-resistant connections in critical assemblies.
- Hex drive compatibility allows for easy installation and removal with standard tools, reducing assembly time.
- Rounded button head design provides a low-profile, finished appearance while minimizing snagging risks.
- Fine UNF threading offers improved load distribution and better sealing capabilities compared to coarse threads.
- Full compliance with industry standards including ASME B18.3 and ASTM F835, guaranteeing consistent quality and interchangeability.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these Black-Oxide Alloy Steel Rounded Head Screws address common challenges like vibration loosening and environmental degradation. The Class 3A UNF fine threads provide superior clamping force and resistance to shock loads, making them ideal for machinery, automotive, and aerospace applications where precision is critical. The hex drive ensures straightforward installation in confined spaces, while the black-oxide surface treatment enhances durability against moisture and chemicals. By combining high tensile strength with fine threading, these screws deliver reliable performance in assemblies requiring repeated disassembly without compromising thread integrity.
Specification Summary & Compliance
This screw meets precise dimensional tolerances with Class 3A thread fit and adheres to ASME B18.3 and ASTM F835 manufacturing specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material sustainability. The product features a 5/16"-24 UNF fine thread, 1 1/2" length, and is fully threaded for consistent engagement across applications.
