S-90344A127 3/8"-16 x 1 1/2" ASTM A574 Socket Head Screws with Flat Washer

Key Features & Benefits at a Glance

• Superior corrosion resistance and sleek appearance with the black-oxide finish on both the alloy steel screw and integrated washer.
• Exceptional tensile strength and durability for high-stress applications, rated at 170,000 psi tensile strength and Rockwell C39 hardness.
• Precise and reliable fastening ensured by the Class 3A thread fit and coarse 3/8"-16 UNC thread, providing excellent grip and vibration resistance.
• Optimized load distribution and surface protection with the included flat washer, reducing the risk of material damage and loosening.
• Secure and efficient installation using a standard 5/16" hex key drive, allowing for high torque application in confined spaces.
• Full-length threading for maximum engagement and holding power along the entire 1 1/2" length of the screw.
• Compliance with major industrial and environmental standards, including ASTM A574, RoHS 3, and REACH, ensuring quality and safety.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in heavy-duty assembly and machinery. The 3/8"-16 UNC coarse thread with a precise Class 3A fit ensures rapid installation and superior resistance to vibrational loosening in dynamic environments. The inclusion of a flat washer significantly enhances load distribution, preventing surface indentation and maintaining joint integrity under high cyclic loads. Manufactured from high-grade alloy steel and treated with a durable black-oxide finish, this screw offers excellent corrosion resistance, making it ideal for demanding sectors like automotive manufacturing, industrial equipment, and construction machinery where reliability and long-term performance are non-negotiable.

Specification Summary & Compliance

This socket head cap screw features a 3/8"-16 UNC coarse thread with a high-precision Class 3A thread fit and is fully threaded along its 1 1/2" length. It is manufactured in compliance with ASTM A574 specification for alloy steel socket head cap screws, ensuring consistent quality and performance. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.