S-91266A576 5/16"-18 x 3/8" ASTM F835 Alloy Steel Thread-Locking Hex Drive Flat Head Screws
Alloy Steel Thread-Locking 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 vibration resistance with nylon patch locking that maintains integrity from -65° to 250°F, ideal for high-stress environments.
- Exceptional tensile strength of 130,000 psi from black-oxide alloy steel, ensuring reliable performance under heavy loads.
- Precise Class 3A thread fit with UNC coarse threading for quick assembly and reduced cross-threading risks.
- Durable corrosion protection via black-oxide coating, extending service life in harsh industrial conditions.
- Easy installation and flush finish with standard 82° countersink angle and hex drive for secure, low-profile fastening.
- Full compliance with ASTM F835, RoHS 3, and REACH, guaranteeing safety and regulatory adherence for global projects.
- Rockwell C39 hardness provides excellent wear resistance, minimizing damage during repeated use.
Professional Applications & Engineering Value
This 5/16"-18 UNC nylon patch locking flat head screw is engineered to address critical challenges in industrial settings, such as machinery vibration and thermal cycling. The nylon patch locking system ensures secure fastening without loosening, even in dynamic applications like automotive assemblies or heavy equipment. Made from black-oxide alloy steel, it offers high tensile strength and corrosion resistance, reducing maintenance needs in environments exposed to moisture or chemicals. The fully threaded design and Class 3A thread fit enable precise engagement, while the 82° countersink angle allows for a smooth, flush mount in metal or composite materials. Ideal for aerospace, manufacturing, and construction, this screw delivers reliable performance where safety and durability are paramount.
Specification Summary & Compliance
This product adheres to Class 3A thread fit and UNC coarse thread standards, ensuring dimensional accuracy and compatibility. It meets ASTM F835 specifications for mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for international use.
