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The carriage bolts are made of 100% stainless steel 18-8 (304), which has strong chemical and corrosion resistance.
Measurement system: inches; Surface treatment: Bright surface treatment.
Thread diameter: 1/4 inch; Number of threads: 20; Head diameter: 0.594 inches; Head height: 0.145 inches; Screw length: 1-1/4 inch.
Package includes: 25 carriage bolts.
These bolts can be used for high stress applications such as valves, pumps, motors, and automotive suspension systems.
link:http://www.hanyangfastener.com
carriage bolt