S-93604A623 1/4"-20 x 2 1/2" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with hot-dipped galvanized steel coating, ideal for outdoor and harsh industrial environments
• Enhanced anti-rotation performance due to the integrated square neck design, preventing bolt spin during tightening
• Reliable load-bearing capacity with Grade 2 strength rating and 60,000 PSI tensile strength for medium-duty applications
• Quick and easy installation facilitated by UNC coarse threading and right-hand thread direction
• Consistent dimensional accuracy ensured by Class 2A thread fit and compliance with ASME B18.5 specifications
• Durable mechanical properties with Rockwell B70 hardness, providing excellent wear resistance
• Environmental and regulatory compliance meeting RoHS 3 and REACH standards for safe, sustainable use

Professional Applications & Engineering Value

This hot-dipped galvanized steel carriage bolt is engineered to address common challenges in construction, agricultural machinery, and structural assemblies where corrosion and vibration loosening are concerns. The square neck securely locks into materials, eliminating the need for additional tools to prevent rotation during nut tightening. Its UNC coarse thread ensures rapid installation even in rough or debris-prone surfaces, reducing labor time. The Grade 2 strength and 60,000 PSI tensile strength make it suitable for framing, trailer builds, and equipment that requires dependable fastening without the high cost of premium-grade bolts. The hot-dipped galvanized finish provides a thick, uniform barrier against rust, extending service life in humid or chemically exposed settings, while adherence to ASTM A307 and ASME B18.5 guarantees consistent quality and interchangeability.

Specification Summary & Compliance

This carriage bolt features a 1/4"-20 UNC coarse thread with Class 2A tolerance for reliable fit, and dimensions including a 2-1/2" length, 0.594" head diameter, and square neck of 0.26" width. It conforms to ASTM A307 for low-carbon steel bolts and ASME B18.5 for dimensional standards, and is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant for environmental safety.