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Ring shank: small directional rings on the shank to prevent the nail from working back out once driven in; common in drywall, flooring, and pole barn nails Shank : the body the length of the nail between the head and the point; may be smooth, or may have rings or spirals for greater holding power
Shank lengths are 2 inches (5.1 cm) ("Tom Thumb") and longer, although most are less than 4 inches (10 cm). The relation of the purchase arm—the length from the mouthpiece to the cheekpiece rings—and the "shank" or lever arm—the length from the mouthpiece to the lowest rein ring, is important in the severity of the bit.
The hook's design allows traction forces to be relayed through the curved/indented portion to and from the proximal end of the hook, which is either a straight shaft (known as the hook's shank) or a ring (sometimes called the hook's "eye") for attachment to a thread, rope or chain, providing a reversible attachment between two objects.
Shank sizes vary from the Tom Thumb (2 inches long) to more than 5 inches. The longer the bit shank, the more powerful its potential effect on the horse. For this reason, overall shank or cheek length, from the top of the cheek ring to the bottom of the rein ring, usually cannot exceed 8 + 1 ⁄ 2 inches for most horse show disciplines.
Square head cap screws up to and including 3 ⁄ 4 inch (19.05 mm) have a head 1 ⁄ 8 inch (3.175 mm) larger than the shank; screws larger than 3 ⁄ 4 inch (19.05 mm) have a head 1 ⁄ 4 inch (6.35 mm) larger than the shank. [9] In 1919, Dyke defined them as screws that are threaded all the way to the head. [10] socket screw
The first possible attachment position, known as smooth cheek, is located in the bit ring. The second position is the top slot of the shank, and is called rough cheek. The second slot is half cheek or middle bar. The last slot is known as full cheek or bottom bar or full curb, and is the most severe setting. [6] [8] [3]: 18
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