S-91266A251 10-32 x 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 thread locker that eliminates loosening in high-stress environments
- Superior corrosion protection from black-oxide coating on alloy steel, extending service life in demanding conditions
- Exceptional load-bearing capacity with 130,000 psi tensile strength for critical structural applications
- Precise thread engagement through Class 3A fine threading ensuring secure fastening in tapped holes
- Wide temperature tolerance from -65° to 250°F maintaining locking performance across extreme environments
- Optimal flush mounting with standard 82° countersink angle for smooth surface finishes
- Reliable installation control via hex drive design providing positive torque application
Professional Applications & Engineering Value
These 10-32 UNF flat head screws with permanent nylon patch locking technology solve critical vibration-induced loosening problems in industrial machinery, electronic enclosures, and automotive assemblies. The black-oxide alloy steel construction provides exceptional durability against environmental exposure while maintaining the 130,000 psi tensile strength required for structural integrity. The Class 3A fine threading ensures precise fit in pre-tapped holes, reducing installation errors and preventing cross-threading. Engineered with an 82° countersink angle, these fasteners deliver flush surface mounting for applications where aerodynamics or safety require smooth profiles. The combination of temperature-resistant thread locker and high-strength material makes these screws ideal for precision equipment subjected to thermal cycling and mechanical stress.
Specification Summary & Compliance
Manufactured to exact Class 3A thread fit tolerances with UNF fine threading (10-32) and complete compliance with ASTM F835 specifications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Features fully threaded design with right-hand direction and 1/4" length for consistent performance across industrial applications.
