A fid is a conical tool traditionally made of wood or bone. It is used to work with rope and canvas in marlinespike seamanship. A fid differs from a marlinspike in material and purposes. A marlinspike is used in working with wire rope, natural and synthetic lines, may be used to open shackles, and is made of metal. A fid is used to hold open knots and holes in canvas, and to separate the "lays" (or strands) of synthetic or natural rope for splicing. A variation of the fid, the gripfid, is used for ply-split braiding. The gripfid has a jamming cleat to pull a cord back through the cord split by the fid's point.
Modern fids are typically made of aluminum, steel, or plastic. In addition to holding rope open to assist the creation of a rope splice, modern push fids have markings for precise measurements in a variety of sizes of rope. The length of these fids is typically 21 or 22 times the diameter of rope to be spliced. A one-half-inch (12.7 mm) diameter rope would have any accompanying fid 10.5–11 in (266.7–279.4 mm) in length with hash-marks denoting the long and short fid measurements. A short fid is 1⁄3 a fid length and a long fid is 2⁄3 the overall fid length.
Modern major rope manufacturers such as Yale Cordage, New England Ropes, and Samson Rope Technologies each have full sets of published splicing directions available on their websites. Typically, all splice directions measurements use fid-length as the unit of measurement.
Below is a chart that shows exact measurements of full fid lengths, short fid lengths, and long fid lengths, using 21 times the diameter of the rope.
A fid is a conical tool traditionally made of wood or bone, used to work with rope and canvas.
FID or fid may also refer to:
FID, IATA code for Elizabeth Field (Suffolk County, New York), U.S.
FID, the country code used by FIDE
The Fid, a mountain in Antarctica
F.I.D. (album), by Masami Akita
Fédération internationale de documentation (FID), a defunct international organization, see International Federation for Information and Documentation
Financial institutions duty, an Australian tax
Firearms identification (often, FID card), defined as part of gun laws in Massachusetts
Flame ionization detector
Flight initiation distance
Foreign internal defense
Fréchet inception distance, image quality metric
Free induction decay
Focus-image distance, in projectional radiography
Stop the Decline (Italian: Fermare il Declino), an Italian political party
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