![]() Almost all bolt manufacturers will list how many grains each shaft weighs or how many grains are in each inch of the shaft. ![]() The bolt's total weight includes the bolt's weight, nock, insert, vanes, and broadhead or field point. The weight of the bolt can have a serious effect on the range of the bolt. Experts recommend longer bolts but they have certain disadvantages as well. Generally, the bolts are 15 to 22 inches long but the standard length is 20 inches. There is not any hard and fast rule of bolt sizing. Nocks are made of either plastic or aluminum. There is no rule or formula for determining the length of fletching needed - generally the longer the shaft is, the longer the fletching needs to be, and vice versa.Ī nock is a small notched piece that is attached to the rear end of the shaft, for engaging and receiving the propulsive push from the string during shooting. They stabilize the trajectory of the bolt via three different means: resisting pitching and yawing of the shaft by acting like a stabilizer fin (fin-stabilization) reducing deviation from the longitudinal axis by creating a back-pulling center of pressure behind the bolt's center of mass ( drag-stabilization) and in some particular cases, creating a rotation around the longitudinal axis (spin-stabilization) by having the fletchings mounted at a slight angle of attack. The fletching is typically made from soft light materials such as feathers, plastic or silicone rubber. Fletchings, also referred to as vanes, are fins located at the rear end of the shaft just before the nock.
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