S-90185A552 1/4"-20 x 2 1/2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance thanks to the integrated square neck design that securely locks into materials, preventing loosening under vibration.
• Exceptional tensile strength and durability with a Grade 5 classification and 120,000 psi tensile strength, ideal for high-stress industrial applications.
• Enhanced corrosion resistance provided by the zinc-plated steel construction, extending service life in various environmental conditions.
• Reliable and easy installation with a fully threaded UNC coarse thread and Class 2A fit, ensuring quick assembly and consistent performance.
• Wide head profile for superior load distribution, reducing surface pressure and minimizing material damage during tightening.
• Consistent hardness and wear resistance with a Rockwell C25 rating, maintaining structural integrity through repeated use.
• Broad compatibility and secure fastening with a 1/4"-20 thread size and right-hand threading, fitting standard components in machinery and structural assemblies.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to address common industrial challenges such as joint failure and fastener loosening under dynamic loads. The square neck design provides exceptional anti-rotation, making it ideal for wood-to-metal connections, structural frameworks, and heavy machinery where vibration resistance is critical. Its UNC coarse threading and Class 2A thread fit ensure rapid installation and reliable hold in wood, composite, and soft metal applications. With a 120,000 psi tensile strength and corrosion-resistant zinc plating, this bolt delivers long-term reliability in construction, agricultural equipment, and transportation industries, reducing maintenance needs and downtime.

Specification Summary & Compliance

This carriage bolt meets ASME B18.5 and SAE J429 specifications, ensuring dimensional accuracy and performance reliability. It features a Class 2A thread fit for standard tolerance and a 1/4"-20 UNC coarse thread with right-hand direction. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental standards for global industrial use.