S-91266A569 1/4"-28 x 1 1/4" 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
- Permanent vibration resistance with Nylon Patch locking technology, ensuring secure fastening in high-stress environments.
- Exceptional durability and corrosion resistance from Black-Oxide Alloy Steel, extending service life in harsh conditions.
- High tensile strength of 130,000 psi and Rockwell C39 hardness for reliable performance under heavy loads.
- Precise Class 3A UNF fine threading for superior fit and reduced risk of cross-threading in critical assemblies.
- Wide temperature tolerance from -65° to 250°F, maintaining locking integrity across diverse operating environments.
- Full threading and standard flat head design for easy installation and flush mounting in countersunk applications.
- Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to industry standards and environmental safety.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel flat head screw with Nylon Patch locking is engineered to address common industrial challenges like vibration-induced loosening and thermal expansion. The Class 3A UNF fine thread provides precise engagement, minimizing play in machinery, automotive, and aerospace assemblies where accuracy is critical. Its high tensile strength (130,000 psi) and robust material composition resist deformation under stress, while the fully threaded design ensures consistent clamping force. Ideal for applications requiring reliable fastening in temperature-varying environments, from engine components to electronic enclosures, this screw delivers long-term stability and reduces maintenance needs.
Specification Summary & Compliance
This screw features 1/4"-28 UNF fine threads with Class 3A fit for high precision, a flat head with 82° countersink angle, and 5/32" hex drive for secure installation. It meets ASTM F835 specifications for mechanical properties and is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental and safety standards are upheld in industrial use.
