Fid

Fid

A fid is a conical tool 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 purpose. A marlinespike is used in working with wire rope, may be used to open shackles, and is made of metal. A fid is used to hold open knots and holes in canvas. A fid is used to open the "lays", or strands of rope, synthetic or natural, for splicing said line.

A "fid" is also a unit of measurement equaling approximately 21 or 22 times the rope's diameter. The fid is further divided into a "short" fid and a "long" fid. A short fid is 1/3 the length of the full fid and a long fid is 2/3 the length of the full fid.

This chart shows examples of short, long, and full fid lengths for ropes of almost all diameters.

Rope
Diameter (in.)

Rope
Circ. (in.) Short Fid
(in.) Long Fid
(in.)

Full Fid
(in.) 3/32" 9/32" 2/3"

1-1/3" 2 1/8" 3/8" 7/8"

1-3/4" 2-5/8" 5/32" 15/32" 1

2-1/5" 3-2/7" 3/16" 9/16" 1-1/3"

2-5/8" 4" 7/32" 21/32" 1-1/2"

3" 4-3/5" 1/4" 3/4" 1-3/4"

3-1/2" 5-1/4" 9/32" 27/32" 2"

4" 6" 5/16" 1" 2-1/5"

4-3/8" 6-4/7" 3/8" 1-1/8" 2-5/8"

5-1/4" 7-7/8" 7/16" 1-1/4" 3"

6-1/8" 9-1/5" 1/2" 1-1/2" 3-1/2"

7" 10-1/2" 9-16" 1-3/4" 4"

7-7/8" 11-4/5" 5/8" 2" 4-3/8"

8-3/4" 13-1/8" 11/16" 2-1/4" 4-4/5"

9-5/8" 14-4/9" 3/4" 2-1/4" 5-1/4"

10-1/2" 15-3/4" 7/8" 2-3/4" 6-1/8"

12-1/4" 18-3/8" 1" 3" 7"

14" 21" 1-1/8" 3-1/2" 7-7/8"

15-3/4" 23-5/8" 1-1/4" 3-3/4" 8-3/4"

17-1/2" 23-1/4" 1-5/16" 4" 9-1/5"

18-3/8" 27-4/7" 1-1/2" 4-1/2" 10-1/2"

21" 31-1/2" 1-5/8" 5" 11-3/8"

22-3/4" 34-1/8" 1-3/4" 5-1/2" 12-1/4"

24-1/2" 36-3/4" 2" 6" 14"

28" 42" 2-1/8" 6-1/4" 14-7/8"

29-3/4" 44-5/8" 2-1/4" 7" 15-3/4"

31-1/2" 47-1/4" 2-1/2" 7-1/2" 17-1/2"

35" 52-1/2" 2-5/8" 8" 18-3/8"

36-3/4" 55-1/8" 2-3/4" 8-1/2" 19-1/4"

38-1/2" 57-3/4" 3" 9" 21"

42" 63" 3-1/4" 10" 22-3/4"

45-1/2" 68-1/4"

External links

* [http://www.marlinespike.com/tools.html Examples of fids.]
* http://www.machovec.com/rope/splicing/splicing.htm for a chart of fid lengths
* [http://home.new.rr.com/theys/ Photos of Marlinspikes and Seamanship tools.] [http://www.animatedknots.com/splicescouting/index.php?Logo
]


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