S-91253A079 2-56 x 3/8" 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 on alloy steel, extending service life in demanding environments
- Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
- Exceptional 130,000 psi tensile strength provides high load-bearing capacity for structural applications
- Rockwell C39 hardness rating maintains thread integrity and prevents stripping during installation
- 82° countersink angle with standard flat head profile enables flush mounting for streamlined surfaces
- Hex drive design (0.050") allows for secure tool engagement and controlled torque application
- Full threading with UNC coarse spacing delivers maximum holding power across the entire fastener length
Professional Applications & Engineering Value
These 2-56 UNC flat head screws in black-oxide alloy steel address critical engineering challenges in precision manufacturing and industrial equipment. The combination of Class 3A thread fit and coarse thread spacing provides exceptional vibration resistance in dynamic applications, while the 82° countersink angle ensures perfect flush mounting in machined components. The hex drive design enables precise torque control during installation, preventing damage to sensitive materials. With fully threaded construction and 130,000 psi tensile strength, these fasteners deliver reliable performance in electronic enclosures, aerospace assemblies, and precision machinery where dimensional accuracy and structural integrity are paramount.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances with UNC coarse thread specifications. Complies with ASME B18.3 and ASTM F835 manufacturing standards. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements. Right-hand thread direction with standard flat head profile ensures compatibility with industry-standard installation tools and procedures.
