S-90185A108 1/4"-20 x 4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance thanks to the integrated square neck that locks securely into materials, preventing spinning during installation and under vibration.
• High-strength reliability for demanding applications with a Grade 5 classification and 120,000 psi tensile strength, ensuring dependable performance under heavy loads.
• Enhanced corrosion resistance from the black-oxide steel finish, providing durable protection in various industrial environments.
• Optimized for quick and easy installation featuring a fully threaded UNC coarse thread pattern and Class 2A fit, allowing for faster assembly and secure fastening.
• Wide, rounded head design distributes clamping force effectively, reducing the risk of surface damage and providing a finished appearance.
• Consistent quality and compliance with ASME B18.5 standards, ensuring dimensional accuracy and interchangeability for industrial use.
• Safe for regulated environments as it is RoHS 3 and REACH compliant, meeting strict environmental and safety regulations.

Professional Applications & Engineering Value

This Grade 5 Carriage Bolt is engineered to solve critical fastening challenges in industrial applications such as machinery assembly, structural framing, and heavy equipment. The black-oxide steel construction offers excellent resistance to rust and wear, extending service life in harsh conditions. Its fully threaded UNC coarse thread and Class 2A fit ensure reliable engagement and ease of installation, reducing labor time. The square neck is a key feature that bites into the material, providing superior anti-rotation security to prevent loosening from vibration—a common issue in dynamic environments. This combination of high tensile strength (120,000 psi) and precise engineering makes it an ideal choice for professionals requiring durable, compliant fasteners that meet ASME B18.5 specifications.

Specification Summary & Compliance

This bolt features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured from black-oxide steel with a hardness of Rockwell C25 and meets ASME B18.5 dimensional standards. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring adherence to environmental and safety regulations for industrial use.