S-91266A654 3/8"-24 x 1 1/4" ASTM F835 Alloy Steel Thread-Locking Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch thread locker, ensuring secure fastening in high-stress environments from -65° to 250°F.
• Superior tensile strength of 130,000 psi for reliable load-bearing capacity in demanding industrial applications.
• Precision Class 3A fine threading for tight, accurate fits and reduced risk of cross-threading during assembly.
• Durable black-oxide finish on alloy steel provides enhanced corrosion resistance and a professional appearance.
• Hex drive design with 7/32" drive size allows for high-torque installation and easy removal with standard tools.
• 82° countersink angle enables flush mounting, minimizing protrusion and improving safety in assembled components.
• Full threading along the 1-1/4" length ensures consistent grip and distribution of clamping force.

Professional Applications & Engineering Value

Engineered for industrial fastening where vibration resistance and precision are critical, these 3/8"-24 UNF flat head screws address common failure points in machinery, automotive, and heavy equipment. The nylon patch thread locker eliminates the need for additional adhesives, maintaining integrity under thermal cycling from -65° to 250°F. Made from black-oxide alloy steel, they offer excellent hardness (Rockwell C39) and durability, while the fine thread and Class 3A fit ensure leak-proof seals and accurate alignment in high-precision assemblies. Ideal for applications requiring reliable, long-term fastening without loosening.

Specification Summary & Compliance

This screw features Class 3A thread fit with UNF fine threading, fully threaded design, and compliance with ASTM F835 specifications. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory adherence for global industrial use.