S-91253A372 3/8"-24 x 3" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior Corrosion Resistance with black-oxide coating, extending service life in harsh industrial environments.
• High Tensile Strength of 130,000 psi ensures reliable load-bearing capacity and prevents fastener failure under stress.
• Precise Class 3A Thread Fit guarantees tight, secure connections with minimal risk of loosening in vibration-prone applications.
• Partially Threaded Design allows for controlled clamping force and reduced risk of cross-threading during assembly.
• 82° Countersink Angle provides a flush, low-profile finish that enhances safety and aesthetics in assembled products.
• Hex Drive (7/32") enables high-torque installation with standard tools, speeding up assembly and reducing labor time.
• Compliance with ASTM F835, RoHS 3, and REACH ensures material consistency, environmental safety, and global regulatory acceptance.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this 3/8"-24 UNF flat head screw addresses critical fastening challenges in machinery, automotive, and structural assemblies. The black-oxide alloy steel construction provides excellent corrosion resistance, reducing maintenance needs in humid or chemically exposed settings. With a Rockwell C39 hardness and 130,000 psi tensile strength, it withstands high dynamic loads and vibrations, preventing joint failure in heavy-duty equipment. The fine UNF thread and Class 3A fit ensure precise engagement in tapped holes, minimizing backlash and improving assembly accuracy. Its partially threaded shank allows the unthreaded portion to act as a dowel, enhancing alignment in precision fixtures. Ideal for applications requiring flush mounting with an 82° countersink, this screw delivers reliable performance in aerospace, manufacturing, and construction projects where durability and compliance are non-negotiable.

Specification Summary & Compliance

This screw adheres to inch system measurements with a 3/8"-24 UNF fine thread and Class 3A thread fit for high precision. It meets ASTM F835 specifications for mechanical properties and is manufactured to ensure consistent dimensional accuracy. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it supports environmental and safety standards, making it suitable for global supply chains. The partially threaded design and 82° countersink angle align with industry norms for secure, low-profile fastening solutions.