Plow Bolts

Plow bolts are specifically crafted to withstand the high-stress conditions of plowing and other farm and machinery activities, which is where they got their name. You may hear the name “carriage bolt” used interchangeably with this fastener, but they are slightly different. While they do perform the same function, plow bolts feature a flat head designed to sit flush on the surface and prevent obstruction or snagging during use, often in metal equipment; carriage bolts have a prominently domed head with a larger diameter and are commonly used to secure wood joints. Plow bolts are available in several head styles (all mostly flat, but with unique shapes to accommodate different installation needs) to connect elements of heavy machinery used in construction, agriculture, and earthmoving industries.

The primary function of plow bolts is to provide a connection in equipment where a smooth, flush surface is critical. To install them, the bolt is positioned in a predrilled hole and hammered in (if necessary). A nut is then attached to the protruding threaded shank and tightened into place. The bolt’s countersunk under head design allows it to create a smooth and clean finish upon installation that reduces the risk of damage or wear to other parts of the machinery. The square neck also locks it in place to prevent turning, which is essential for maintaining the integrity of the connection under the rigors of heavy use.

The measurement of plow bolts varies based on their head type. For flat heads, the length is measured from the top of the head to the end of the threaded bolt. For dome heads, it's measured from the largest diameter point of the head to the end of the threaded bolt. The dome portion of the head is not included in the length measurement.