S-91253A366 3/8"-24 x 2 1/4" 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 tensile strength of 130,000 psi ensures reliable performance in high-stress industrial applications
- Superior corrosion resistance through black-oxide coating extends service life in demanding environments
- Precision Class 3A thread fit guarantees secure fastening and vibration resistance in critical assemblies
- Fine UNF threading provides superior holding power and reduced loosening under dynamic loads
- Rockwell C39 hardness maintains structural integrity and prevents deformation during installation
- Hex drive design with 7/32" size enables efficient installation and removal with standard tools
- Partial threading allows for optimal clamp force distribution across connected components
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws deliver exceptional engineering value in demanding industrial applications where reliability is paramount. The 3/8"-24 UNF fine threading combined with Class 3A thread fit ensures superior vibration resistance in machinery, automotive assemblies, and heavy equipment. The 82° countersink angle provides flush mounting in precision applications, while the partially threaded design concentrates clamping force exactly where needed. The black-oxide surface treatment offers enhanced corrosion protection without compromising dimensional accuracy, making these flat head screws ideal for applications requiring both environmental resistance and precise fitment in manufacturing, construction, and mechanical systems.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit precision and UNF fine threading specifications. These screws comply with ASTM F835 manufacturing standards and feature Rockwell C39 hardness with 130,000 psi tensile strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The 2 1/4" length with 1 1/4" minimum thread length provides optimal engagement for secure fastening in industrial applications.
