1/2-13 x 4 Carriage Bolt Fully Threaded Zinc 2 1/4-12 and the 7/8 refers to

and the 7/8 refers to the length of the screw

The M10 x 55 DIN 931 8

Its 1-inch length makes it ideal for a wide range of fastening tasks

it is heat treated to achieve a Grade 8 rating

this hex cap screw is an excellent choice

1/2-13 x 4 Carriage Bolt Fully Threaded Zinc 2 1/4-12 and the 7/8 refers toThe 1 2 13 x 4 Carriage Bolt Fully Threaded Zinc is a high quality fastener designed for a variety of applications. Made from durable steel, this bolt is zinc plated for added corrosion resistance. Its fully threaded design provides maximum holding power, while the square neck prevents the bolt from turning when tightened. The 1 2 13 thread size ensures a secure fit in compatible materials. With its strength, durability, and versatility, this carriage