S-91205A621 3/8"-24 x 1" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with Nylon Patch thread locker that maintains secure fastening from -70° to 250°F, preventing loosening in dynamic applications
• Exceptional strength-to-weight ratio from alloy steel construction, delivering 170,000 psi tensile strength for heavy-duty load requirements
• Precise thread engagement with Class 3A UNF fine threads ensuring tighter tolerances and superior clamping force in critical assemblies
• Enhanced corrosion protection through Black-Oxide surface treatment, providing durable resistance in industrial environments
• Optimized drive efficiency with 5/16" hex socket design allowing high torque application and reduced cam-out risk
• Full-threaded versatility enabling consistent engagement along the entire 1" length for adjustable positioning
• Industry compliance assurance meeting ASME B18.3 specifications and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This socket head cap screw delivers critical performance in demanding applications where vibration resistance and precise clamping are paramount. The Black-Oxide alloy steel construction combined with Class 3A UNF fine threads addresses common industrial challenges of joint integrity and fatigue failure. The integrated Nylon Patch thread locker provides reliable vibration resistance without requiring separate locking components, streamlining assembly processes in machinery, automotive, and aerospace applications. The fully threaded design ensures maximum thread engagement in tapped holes, while the hex socket drive facilitates installation in confined spaces where wrench clearance is limited. This combination of features makes it ideal for precision equipment, hydraulic systems, and structural assemblies requiring maintained clamp load under thermal cycling and dynamic stresses.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision UNF fine thread engagement. The 3/8"-24 thread size provides optimal pitch for fine adjustment applications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Material certification includes ASTM A574 alloy steel with Rockwell C37 hardness and 170,000 psi tensile strength rating. Thread locker performance validated across operational temperature range of -70° to 250°F.