S-91253A560 1/4"-20 x 3" 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 durability with 130,000 psi tensile strength and Rockwell C39 hardness for reliable performance in demanding applications
- Superior corrosion resistance thanks to the black-oxide finish on alloy steel, extending service life in industrial environments
- Precise thread engagement with Class 3A UNC coarse threading ensuring secure fastening and vibration resistance
- Optimal flush mounting featuring an 82° countersink angle and flat head design for smooth surface finishes
- Easy installation and removal with 5/32" hex drive providing positive torque transmission
- Versatile partial threading allowing for both clamping and alignment functions in assembly operations
- Full regulatory compliance meeting ASTM F835, RoHS 3, and REACH standards for quality assurance
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws deliver critical engineering solutions where surface flushness and high-strength fastening are paramount. The UNC coarse threading with Class 3A fit provides excellent vibration resistance in machinery, automotive, and heavy equipment applications. The 82° countersink angle ensures perfect seating in precision-machined components, while the partial threading design offers superior clamping force control. The black-oxide surface treatment significantly enhances corrosion resistance in challenging industrial environments, making these hex drive screws ideal for structural assemblies requiring both durability and regulatory compliance.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse threading (1/4"-20). Features include 3" length with 1" minimum thread engagement, 82° countersink angle, and 5/32" hex drive. Fully compliant with ASTM F835 specifications for mechanical properties, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) for chemical safety compliance.
