S-91253A075 2-56 x 3/16" 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 corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Superior thread engagement with Class 3A fit ensures precise, vibration-resistant fastening in critical assemblies
- High-torque installation capability through hex drive design prevents stripping and enables secure mounting
- Maximum material strength with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
- Optimal flush mounting with 82° countersink angle and flat head design for smooth surface finishes
- Reliable coarse threading (UNC) provides faster installation and better performance in softer materials
- Full regulatory compliance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global acceptance
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws with 2-56 UNC coarse threading deliver critical performance advantages in precision engineering applications. The hex drive design (0.050" drive size) ensures maximum torque transfer without cam-out, while the Class 3A thread fit provides superior vibration resistance in dynamic assemblies. The fully threaded configuration offers consistent clamping force along the entire 3/16" length, making these industrial screws ideal for electronic enclosures, machinery components, and automotive assemblies where high tensile strength (130,000 psi) and reliable fastening are paramount. The 82° countersink angle creates seamless surface integration, eliminating protrusions in precision equipment.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances with UNC coarse thread spacing and right-hand threading. Complies with ASME B18.3 dimensional specifications and ASTM F835 mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for global industrial applications. Features Rockwell C39 hardness and 130,000 psi tensile strength for reliable performance in demanding conditions.
