S-91253A920 1"-8 x 4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat Head 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 130,000 PSI ensures reliable performance in demanding industrial applications, reducing the risk of fastener failure.
- Class 3A thread fit precision provides superior engagement and vibration resistance, minimizing loosening in high-stress environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for extended service life.
- Partially threaded design with coarse UNC spacing allows for faster installation and improved grip in softer materials or where rapid assembly is critical.
- 5/8" hex drive and flat head with 82° countersink enable secure, flush mounting and easy torque application with standard tools.
- Compliance with ASTM F835, RoHS 3, and REACH guarantees adherence to rigorous industry standards and environmental safety regulations.
- Rockwell C37 hardness ensures high wear resistance and durability under repetitive loads and harsh conditions.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial use, these 1"-8 UNC flat head screws in black-oxide alloy steel address critical challenges in machinery, construction, and automotive assemblies. The coarse thread spacing and partially threaded configuration facilitate quick, secure fastening in materials prone to stripping, while the high tensile strength and Class 3A thread fit prevent joint failure under dynamic loads. Ideal for applications requiring flush surfaces and reliable vibration resistance, such as equipment frames and structural components, these screws combine precision UNC thread type with robust material properties to enhance assembly integrity and reduce maintenance needs.
Specification Summary & Compliance
This product features precise Class 3A thread fit and UNC coarse thread specifications, ensuring dimensional accuracy per industry standards. It complies with ASTM F835 for mechanical properties, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) for chemical safety, confirming its suitability for global industrial and commercial use.
