S-91263A391 5-40 x 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 fastening under high-stress conditions, reducing the risk of mechanical failure.
- Superior corrosion resistance from zinc-plated alloy steel construction extends service life in demanding industrial environments.
- Precision Class 3A thread fit guarantees consistent, secure engagement with mating parts, minimizing assembly issues.
- Fully threaded design provides maximum grip and load distribution along the entire screw length for enhanced stability.
- Standard 82° countersink angle allows for a flush, professional finish that eliminates protrusions and improves safety.
- Hex drive (5/64") compatibility enables efficient installation with common tools, speeding up assembly processes.
- Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to rigorous quality and environmental standards for global applications.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these 5-40 UNC flat head screws address critical challenges such as vibration loosening and material fatigue. The zinc-plated alloy steel offers excellent durability against corrosion, while the Class 3A thread fit and coarse thread spacing provide reliable fastening in metals and plastics. Ideal for machinery, electronics, and automotive assemblies, the fully threaded design ensures uniform stress distribution, and the 82° countersink angle facilitates seamless integration into components, reducing the need for rework and enhancing overall structural integrity in right-hand thread applications.
Specification Summary & Compliance
This screw features precise Class 3A thread fit per UNC standards, with dimensions including a 1/4" length and 0.125" thread diameter. Manufactured to meet ASTM F835 specifications, it ensures high performance in tensile strength and hardness (Rockwell C39). The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing safety and environmental responsibility in industrial use.
