S-91253A634 3/8"-16 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, extending service life in harsh industrial environments
- Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads and vibration
- Precision Class 3A thread fit provides superior engagement and reduces cross-threading risks during assembly
- 82° countersink angle enables flush mounting for cleaner aesthetics and improved aerodynamic profiles
- Partially threaded design offers optimal clamping force distribution while preventing material distortion
- Hex drive compatibility with 7/32" tools allows for high-torque installation in confined spaces
- Rockwell C39 hardness maintains thread integrity and drive features through repeated installation cycles
Professional Applications & Engineering Value
These black-oxide alloy steel flat head socket cap screws deliver critical performance advantages in demanding applications where corrosion resistance, high strength, and precise flush mounting are essential. The 3/8"-16 UNC coarse threading combined with Class 3A thread fit ensures rapid assembly with minimal galling in steel frameworks, machinery components, and structural assemblies. The partially threaded configuration concentrates clamping force precisely where needed, preventing joint relaxation in vibrating equipment. With 130,000 psi tensile strength and proper 82° countersink angle, these screws provide reliable fastening in aerospace, automotive, and heavy equipment applications where surface continuity and structural integrity are paramount.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 and ASTM F835 specifications, these screws feature Class 3A thread fit for superior dimensional accuracy and consistent performance. The black-oxide alloy steel construction meets rigorous industry standards while maintaining full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. With precise 2 1/2" length and 3/8"-16 UNC coarse thread specifications, these fasteners deliver reliable, repeatable performance in critical industrial applications.
