S-91253A876 5/8"-18 x 2 1/2" 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
- Superior corrosion resistance with black-oxide coating that protects against rust in demanding industrial environments
- Exceptional tensile strength of 130,000 PSI ensures reliable performance under heavy loads and vibration
- Precision Class 3A thread fit provides tighter tolerances for secure fastening in critical applications
- Full threading design offers maximum grip length and uniform stress distribution across the entire fastener
- 82° countersink angle allows for flush mounting in standard countersunk holes
- 3/8" hex drive enables high-torque installation with standard industrial tools
- Comprehensive compliance with ASTM F835, RoHS 3, and REACH ensures material quality and environmental safety
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these black-oxide alloy steel flat head screws deliver exceptional performance in machinery assembly, structural frameworks, and equipment manufacturing. The UNF fine thread spacing combined with Class 3A thread fit provides superior vibration resistance and prevents loosening in dynamic environments. The Rockwell C37 hardness ensures excellent wear resistance, while the fully threaded design maximizes engagement in thick materials. The 82° countersink angle creates seamless flush mounting, eliminating protrusions in precision assemblies. These high-strength screws are particularly valuable in applications requiring reliable fastening under extreme stress conditions, from industrial machinery to construction equipment.
Specification Summary & Compliance
This 5/8"-18 UNF flat head screw features precision Class 3A thread fit with fine thread spacing for optimal engagement. Manufactured to ASTM F835 specifications with complete RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. The black-oxide alloy steel construction delivers 130,000 PSI tensile strength and Rockwell C37 hardness, ensuring dimensional stability and durability in demanding applications.
