S-91266A567 1/4"-28 x 1" 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 thread locker that maintains secure fastening in high-stress environments
- Exceptional tensile strength of 130,000 psi for reliable performance in heavy-duty industrial applications
- Wide temperature tolerance from -65° to 250°F ensures consistent performance across diverse operating conditions
- Precise Class 3A thread fit provides superior engagement and reduces the risk of cross-threading during installation
- Corrosion-resistant black-oxide finish on alloy steel extends service life in demanding environments
- 82° countersink angle allows for flush mounting in standard applications for clean, professional installations
- 5/32" hex drive enables efficient installation with standard tools while preventing cam-out
Professional Applications & Engineering Value
These 1/4"-28 UNF flat head screws with nylon patch locking technology solve critical vibration-induced loosening problems in industrial machinery, automotive assemblies, and electronic enclosures. The black-oxide alloy steel construction combined with Class 3A thread fit ensures precise alignment and consistent clamping force, while the fully threaded design provides maximum engagement in thin materials. Engineered to withstand extreme temperature fluctuations from -65° to 250°F, these fine thread screws maintain their locking integrity in environments where thermal cycling would compromise ordinary fasteners. The 82° countersink profile facilitates seamless integration into precision-machined components, making them ideal for applications requiring both security and aesthetic considerations.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerances with UNF fine threading (1/4"-28), these screws meet ASTM F835 specifications for dimensional accuracy and performance. The fully threaded design maintains consistent engagement, while the 5/32" hex drive ensures reliable installation. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and material safety for global industrial applications.
