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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. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   Diagrams and tables of many screwthread series. In German; DIN 931: M1,6 to M39 Hexagon head bolts (Product grades A and B) Archived 10 December 2022 at the Wayback Machine(1987) IS 9519: Fasteners - Hexagon products - Width across flats, Indian standard (2013) Metric screw thread profile, dimensions and tolerances; Metric bolt sizes, threads ...

4. 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 ...

5. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   In 1913, Woolley and Meredith defined them like Anthony, but gave the following dimensions: hex head cap screws up to and including 7 ⁄ 16 inch (11.1125 mm) have a head that is 3 ⁄ 16 inch (4.7625 mm) larger than the shank diameter; screws greater than 1 ⁄ 2 inch (12.7 mm) in diameter have a head that is 1 ⁄ 4 inch (6.35 mm) larger than ...

6. Match crossbow - Wikipedia

   en.wikipedia.org/wiki/Match_crossbow

   The bolt is shot at a black and white target card—one shot per card, the same bolt shot repeatedly. The size of the target is the same as the Olympic air-rifle target; 0.5 mm diameter 10-ring. The 10 meter competition program is run in separate relays for each category; Men shoot 60 bolts, Women and U-21 Juniors each shoot 40 bolts.

7. Robertson screw - Wikipedia

   en.wikipedia.org/wiki/Robertson_screw

   A Robertson screw, also known as a square screw [1] or Scrulox, [2] is a type of screw with a square-shaped socket in the screw head and a corresponding square protrusion on the tool.