S-91266A540 1/4"-20 x 3/4" 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
- Exceptional vibration resistance with a permanent nylon patch thread locker that maintains secure fastening in high-stress environments.
- Superior corrosion protection from the black-oxide finish, extending service life in harsh industrial conditions.
- High tensile strength of 130,000 psi ensures reliable performance under heavy loads and mechanical stress.
- Precise Class 3A thread fit for smooth installation and reduced risk of cross-threading in critical assemblies.
- Wide temperature tolerance from -65° to 250°F allows use in extreme thermal environments without compromising integrity.
- Optimized for flush mounting with an 82° countersink angle and flat head design, minimizing protrusion in streamlined applications.
- Durable alloy steel construction with Rockwell C39 hardness provides long-term wear resistance and fatigue strength.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these black-oxide alloy steel flat head hex screws address common challenges like vibration-induced loosening and corrosion. The permanent nylon patch thread locker ensures consistent clamping force in machinery, automotive, and aerospace assemblies, reducing maintenance needs. With UNC coarse threads and a Class 3A fit, they offer quick installation and reliable engagement in metals or composites. The flat head with hex drive allows for low-profile, high-torque fastening, ideal for applications where space and aesthetics are critical. Compliant with ASTM F835, they meet rigorous standards for heavy-duty fasteners, providing peace of mind in safety-critical environments.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC coarse thread with Class 3A precision tolerance for accurate fit. It is fully threaded and manufactured to ASTM F835 specifications, ensuring consistent quality. The product is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for global industrial use.
