S-92190A199 3/4"-10 x 4" ASME B18.2.1, SAE J429 Left-Hand Threaded Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior strength for demanding applications with Grade 5 steel construction and 110,000 psi tensile strength, ensuring reliable performance under high stress.
• Enhanced durability and wear resistance provided by Rockwell C21 hardness, extending the fastener's service life in industrial environments.
• Secure left-hand threading for specialized assemblies prevents loosening in applications with counter-clockwise rotational forces.
• Precise Class 2A thread fit on the 3/4"-10 UNC coarse threads ensures easy assembly and consistent clamping force.
• Optimized for high-torque applications with a 1 1/8" external hex head, allowing for efficient installation and removal with standard tools.
• Versatile partially threaded design with a 1 3/4" minimum thread length provides strong grip where needed while reducing weight.
• Compliance with major industrial standards including ASME B18.2.1 and SAE J429, guaranteeing interchangeability and reliability.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors where reverse-thread applications are essential. The left-hand UNC coarse threading provides secure fastening in systems subject to counter-clockwise rotation, preventing accidental disassembly. Manufactured from high-strength steel with Rockwell C21 hardness, it resists deformation and wear under repetitive stress. The partially threaded design concentrates strength in the engaged section, reducing material use without compromising integrity. With a 1 1/8" hex head and external drive style, it ensures compatibility with standard wrenches, facilitating quick maintenance in confined spaces. Ideal for demanding environments, this screw delivers reliable performance where failure is not an option.

Specification Summary & Compliance

This fastener meets precise dimensional standards with Class 2A thread fit for the 3/4"-10 UNC coarse threads, ensuring consistent engagement. It conforms to ASME B18.2.1 and SAE J429 specifications for hex head screws, guaranteeing dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for use in global markets.