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2. Crossbow bolt - Wikipedia

   en.wikipedia.org/wiki/Crossbow_bolt

   Generally, the bolts are 15 to 22 inches long but the standard length is 20 inches. Experts recommend longer bolts [4] but they have certain disadvantages as well. The weight of the bolt can have a serious effect on the range of the bolt. The bolt's total weight includes the bolt's weight, nock, insert, vanes, and broadhead or field point.

3. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   A machine screw or bolt is usually a smaller fastener (less than 1 ⁄ 4 inch (6.35 mm) in diameter) threaded the entire length of its shank that usually has a recessed drive type (slotted, Phillips, etc.), usually intended to screw into a pre-formed thread, either a nut or a threaded (tapped) hole, unlike a wood or self-tapping screw. Machine ...

4. Modern competitive archery - Wikipedia

   en.wikipedia.org/wiki/Modern_competitive_archery

   The maximum permitted draw weight is 43 kg (95 lb) at a maximum power stroke of 30 cm (12 in). Shooting a 20 grams (310 grains) bolt this set up will generate an initial velocity of around 67 m/s (240 km/h; 150 mph). Field crossbow bolts are made from tubular aluminium or carbon-fibre archery shaft materials.

5. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   This Standard provides essential specifications and dimensions for the gauges used on Unified inch screw threads UN [unified] and UNR [external threads only] thread form, and covers the specifications and dimensions for the thread gauges and measuring equipment listed in Tables 1 and 2. The basic purpose and use of each gauge are also described.

6. Springald - Wikipedia

   en.wikipedia.org/wiki/Springald

   Modern reconstruction of a torsion springald, the twisted skeins powering the inward projecting bow arms can be seen. Displayed at the Tower of London. Several reconstructed examples can be found, Jean Leibell produced a 12-inch (30.5 cm) model for his researches into "Springalds and Great Crossbows" which was commissioned by the Royal Armouries Museum, and a larger model can be seen at the ...

7. AOL

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   The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.