S-91255A053 1/2"-20 x 1" 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 reliable performance in demanding industrial environments
- Precise Class 3A thread fit ensures secure fastening and vibration resistance in critical applications
- High tensile strength of 120,000 PSI provides superior load-bearing capacity for heavy-duty assemblies
- Rockwell C39 hardness rating delivers excellent wear resistance and long-term durability
- 5/16" hex drive design allows for easy installation and removal with standard tools
- Fully threaded construction maximizes engagement strength across the entire fastener length
- Regulatory compliance assurance with RoHS 3 and REACH standards for global market acceptance
Professional Applications & Engineering Value
These black-oxide alloy steel rounded head screws with 1/2"-20 UNF fine threading are engineered to solve critical fastening challenges in industrial machinery, automotive assemblies, and heavy equipment. The Class 3A thread fit provides superior vibration resistance, preventing loosening in high-stress applications. The button head profile offers a low-profile solution where clearance is limited, while the black-oxide surface treatment enhances corrosion protection without compromising dimensional accuracy. With 120,000 PSI tensile strength and Rockwell C39 hardness, these fasteners maintain integrity under extreme mechanical loads, making them ideal for precision engineering applications requiring reliable, long-term performance.
Specification Summary & Compliance
This rounded head screw features precision Class 3A thread fit with 1/2"-20 UNF fine threading and full threading along the 1" length. Manufactured to ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for safe and sustainable industrial components.
