S-90185A115 5/16"-18 x 2 1/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel finish, ideal for harsh industrial environments
• Exceptional tensile strength of 120,000 psi ensures reliable performance in heavy-duty applications
• Square neck design prevents rotation during installation for secure fastening
• Class 2A thread fit provides optimal assembly tolerance for smooth installation
• Grade 5 classification guarantees consistent mechanical properties and durability
• Full threading allows for maximum engagement and adjustable positioning
• Wide rounded head distributes load evenly and provides enhanced bearing surface

Professional Applications & Engineering Value

These Grade 5 carriage bolts with black-oxide steel construction address critical engineering challenges in structural and machinery applications. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures reliable performance under heavy loads and vibration. The square neck design eliminates spinning during torque application, significantly reducing installation time in wood-to-metal and structural steel connections. The UNC coarse threading provides superior pull-out resistance in soft materials while the fully threaded design allows for versatile positioning in construction, agricultural equipment, and transportation applications where ASME B18.5 compliance is required.

Specification Summary & Compliance

This 5/16"-18 carriage bolt features Class 2A thread fit per UNC standards with precise dimensional accuracy. Manufactured to meet ASME B18.5 specifications and Grade 5 mechanical properties, ensuring consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, making them suitable for regulated industrial applications worldwide.