S-98060A820 3/8"-16 x 1 1/4" SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance thanks to the knurled neck design, preventing loosening under vibration in demanding applications.
• High tensile strength of 120,000 psi ensures reliable performance and structural integrity for heavy-duty and critical fastening tasks.
• Enhanced corrosion resistance provided by the zinc-plated steel construction, extending service life in various industrial environments.
• Easy and secure installation with the wide, rounded carriage head that sits flush and resists turning during tightening.
• Optimized thread engagement with UNC coarse threading and Class 2A fit, enabling quick assembly and reliable hold in a wide range of materials.
• Consistent material hardness (Rockwell C25) provides excellent wear resistance and durability under repeated stress.
• Compliance with major industry standards including SAE J429, ensuring quality and reliability for professional and regulated applications.

Professional Applications & Engineering Value

This Grade 5 carriage bolt is engineered to solve common industrial fastening challenges, such as joint failure under high vibration and corrosion-induced weakening. The zinc-plated steel material offers a robust barrier against rust, crucial for outdoor machinery, agricultural equipment, and automotive frames. The partially threaded design with UNC coarse threads ensures that the unthreaded shank bears shear loads effectively, while the threaded portion provides strong tensile clamping force. The knurled neck is a critical feature that bites into the mounting material, preventing spin-out during nut installation and maintaining clamp load in high-vibration environments like conveyor systems or vehicle chassis. This combination of high tensile strength and anti-rotation design makes it a reliable choice for structural connections where safety and longevity are paramount.

Specification Summary & Compliance

This carriage bolt features a 3/8"-16 UNC thread with a Class 2A thread fit, ensuring standard-compliant dimensional accuracy and interchangeability. It is manufactured to meet the SAE J429 specification for Grade 5 fasteners, guaranteeing consistent mechanical properties. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for hazardous substances.