S-90185A102 1/4"-20 x 1" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance thanks to the integrated square neck design, preventing the bolt from turning during installation and ensuring a secure, vibration-resistant connection.
• Exceptional strength for demanding applications with a Grade 5 classification and 120,000 psi tensile strength, providing reliable performance under high stress.
• Enhanced durability and corrosion resistance from the black-oxide steel finish and a Rockwell C25 hardness, extending the fastener's service life in various environments.
• Reliable and easy installation with a fully threaded UNC coarse thread and Class 2A fit, ensuring quick assembly and consistent engagement.
• Wide head profile for superior load distribution, reducing the risk of surface damage and providing a larger bearing area for a more secure hold.
• Compliance with major industrial standards including ASME B18.5, guaranteeing dimensional accuracy and interchangeability.
• 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 challenges in industrial assembly and heavy-duty construction. The combination of black-oxide steel and a Rockwell C25 hardness provides excellent resistance to wear and environmental factors, making it ideal for outdoor machinery, agricultural equipment, and structural frameworks. The defining square neck is a key engineering feature that locks the bolt into place upon installation, effectively preventing rotation and loosening caused by vibration—a common failure point in dynamic systems. Paired with a 1/4"-20 UNC coarse thread, it ensures rapid installation and robust holding power in wood, metal, and other materials, streamlining production and maintenance processes while enhancing the long-term integrity of the assembly.

Specification Summary & Compliance

This carriage bolt adheres to precise dimensional and performance standards. The threading conforms to UNC coarse spacing with a Class 2A thread fit for consistent engagement. It is manufactured in compliance with the ASME B18.5 standard (SAE J429), ensuring reliability and interchangeability. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental and safety regulations for hazardous substances.