S-91266A542 1/4"-20 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
- Secure vibration-resistant locking with nylon patch thread locker that maintains integrity across temperatures from -65° to 250°F
- Exceptional tensile strength rated at 130,000 psi for reliable performance in high-stress applications
- Corrosion-resistant black-oxide coating on alloy steel enhances durability in demanding industrial environments
- Precise Class 3A thread fit ensures smooth installation and superior engagement in tapped holes
- Optimized hex drive design (5/32") provides secure tool grip and reduces stripping during high-torque applications
- 82° countersink angle allows for flush mounting in standard chamfered holes
- Full threading along 1" length delivers maximum grip strength across the entire fastener engagement
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these black-oxide alloy steel flat head screws combine high tensile strength with reliable vibration resistance. The nylon patch thread locking technology prevents loosening under dynamic loads, making them ideal for machinery, automotive assemblies, and equipment subjected to constant vibration. The UNC coarse thread configuration ensures rapid installation in production environments while maintaining Class 3A precision fit for consistent performance. The flat head design with 82° countersink provides clean, flush finishes in structural applications where protrusion isn't acceptable. These fully threaded hex drive screws deliver exceptional value in maintenance, manufacturing, and heavy equipment applications where secure fastening and long-term reliability are critical.
Specification Summary & Compliance
This 1/4"-20 UNC flat head screw features Class 3A thread fit with coarse thread spacing and right-hand threading. Manufactured to ASTM F835 specifications with Rockwell C39 hardness and fully threaded design. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for industrial use.
