S-90185A129 3/8"-16 x 5" ASME B18.5, SAE J429 Carriage Bolts
Carriage Bolts
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Basic Information
Head Parameters
Neck & Shank Parameters
Dimension Parameters
Thread Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Exceptional load-bearing capacity with 120,000 psi tensile strength, ideal for demanding structural applications
- Superior corrosion resistance thanks to the black-oxide steel coating, extending service life in harsh environments
- Secure anti-rotation design featuring a square neck that locks into materials to prevent spinning during installation
- Reliable coarse threading with UNC pattern and Class 2A fit for faster assembly and strong vibration resistance
- Optimized head geometry with a wide, rounded carriage style for increased bearing surface and reduced surface damage
- Consistent mechanical performance ensured by Rockwell C25 hardness and Grade 5 classification
- Full thread coverage along the 5" length for maximum grip and flexibility in material thickness
Professional Applications & Engineering Value
This black-oxide steel carriage bolt is engineered to address critical challenges in heavy-duty industrial applications, such as machinery assembly, structural framing, and transportation equipment. The square neck design effectively counters rotation during tightening, eliminating the need for secondary locking mechanisms and speeding up installation. Its fully threaded UNC coarse pattern ensures rapid engagement and maintains integrity under dynamic loads and vibrations. The black-oxide coating provides a durable barrier against moisture and chemicals, reducing maintenance costs in corrosive settings. With a rounded wide head, it distributes clamping force evenly, minimizing surface indentation on wood or metal substrates. Ideal for construction, automotive, and agricultural sectors, this Grade 5 carriage bolt delivers reliable performance where strength and durability are paramount.
Specification Summary & Compliance
This carriage bolt adheres to Class 2A thread fit tolerances and UNC coarse thread standards for consistent dimensional accuracy. It meets ASME B18.5 and SAE J429 specifications, ensuring manufacturing quality and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental safety and regulatory requirements in global markets.
