ELEVATOR BOLTS (BELT BOLTS) 
Elevator bolts are often used with canvas or other soft, pliable materials. The large diameter, flat countersunk head keeps them from pulling through the material. Also known as belt bolts, elevator bolts are also known for a shallow, conical bearing surface, an integrally-formed square neck under the head, and a unified thread pitch.
A common application for elevator bolts is industrial or agricultural belting systems, or conveyor systems, where head clearances must be minimal and where a wide thin bearing surface is desired. Similar to the carriage bolt, the elevator bolt's square shoulder under head prevents turning when nut is applied.
Minimum Thread Length, Elevator Bolts up to 6 inches in Length: The length of the threaded portion of the shaft on standard elevator bolts (all of our stock are standard items), 6 inches or shorter, is 2 times the diameter of the shaft plus 1/4 inch.
Minimum Thread Length, Elevator Bolts over 6 inches in Length: The length of the threaded portion of the shaft on standard elevator bolts (all of our stock are standard items), longer than 6 inches, is 2 times the diameter of the shaft plus 1/2 inch.
Elevator Bolts too short to accomodate the minimum thread lengths described above are fully-theaded.
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