S-97000A522 3/8"-16 x 1 1/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress industrial applications.
• Superior Anti-Rotation Security: Integrated square neck design prevents bolt spinning during installation and under vibration, reducing assembly time and maintenance needs.
• Enhanced Corrosion Resistance: Zinc yellow-chromate plating provides durable protection against rust and environmental degradation in harsh operating conditions.
• Optimized Thread Engagement: Fully threaded UNC coarse pattern with Class 2A fit allows for faster installation and consistent clamping force across various materials.
• Exceptional Durability: Rockwell C33 hardness maintains structural integrity and thread form under repeated loading and impact.
• Wide Application Compatibility: Rounded carriage head with wide profile distributes load evenly, minimizing surface damage in wood, metal, and composite assemblies.
• Industry Standard Compliance: Manufactured to ASME B18.5 and SAE J429 specifications for guaranteed interchangeability and engineering reliability.

Professional Applications & Engineering Value

This Grade 8 carriage bolt delivers critical engineering solutions where vibration resistance and structural integrity are paramount. The square neck design mechanically locks into assembled materials, eliminating rotational movement that compromises joint security in machinery, structural steel frameworks, and transportation equipment. The zinc yellow-chromate plating creates a sacrificial barrier that significantly extends service life in humid or corrosive environments, reducing replacement frequency and downtime. Combined with UNC coarse threading and 150,000 psi tensile strength, this fully threaded fastener maintains clamp load under dynamic stresses, making it ideal for heavy-duty construction, agricultural machinery, and industrial conveyor systems where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to Class 2A thread fit tolerances for consistent engagement, with 3/8"-16 UNC coarse thread specifications ensuring compatibility with standard industrial components. Complies with ASME B18.5 dimensional standards and SAE J429 material requirements for Grade 8 fasteners. The zinc yellow-chromate finish meets RoHS and REACH environmental compliance for industrial use.