S-90185A137 1/2"-13 x 1 1/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Prevents rotation during installation with integrated square neck design that locks securely into materials
• Enhanced corrosion resistance through black-oxide steel finish for extended service life in demanding environments
• Superior load-bearing capacity with Grade 5 classification providing 120,000 psi tensile strength
• Reliable coarse threading with UNC 1/2"-13 pattern ensures faster assembly and reduced cross-threading risks
• Consistent mechanical performance maintained through Rockwell C25 hardness for repeated use without deformation
• Full-thread engagement along the 1-1/4" length maximizes connection stability across material thicknesses
• Industry-standard compatibility with Class 2A thread fit guaranteeing precise interchangeability

Professional Applications & Engineering Value

These black-oxide steel carriage bolts deliver critical anti-rotation performance in structural applications where vibration resistance is paramount. The square neck design embeds securely into wood, metal, or composite materials, eliminating the need for secondary locking mechanisms during assembly. Engineered with Grade 5 strength classification and coarse UNC threading, they withstand dynamic loads in heavy equipment, trailer manufacturing, and construction frameworks. The combination of 120,000 psi tensile strength and corrosion-resistant finish ensures long-term reliability in outdoor or high-moisture industrial environments, reducing maintenance frequency and replacement costs.

Specification Summary & Compliance

Manufactured to ASME B18.5 and SAE J429 specifications with Class 2A thread fit tolerances. Features 1/2"-13 UNC coarse thread spacing with right-hand orientation and full threading along the 1-1/4" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for industrial use.