MIL-DTL-613D
TABLE III. Circumference of rope for thimble sizes 1 and 2.
Circumference of
Size
rope for thimble
Inches (mm)
1
6 (152)
2
4.5 (114)
3.3.4 Sizes 3 and 4. The nominal weight of size 3 grapnel shall be 15 pounds (6.8 kgs), (weight
without chain), and of size 4 grapnels shall be 4 pounds (1.8kgs) (weight without chain). The grapnels
shall be constructed in accordance with figure 4. Six feet (1.8m) of 1/4 inch (.25 in/6.4mm) chain shall be
attached to each grapnel by means of a pear-shaped connecting link. Chain shall be welded steel, proof
coil chain in accordance with type I, grade C, class 4 of RR-C-271. A second pear-shaped connecting
link shall be attached to the other end of the chain. Both pear-shaped links shall be fabricated from 11/32
inch (.34in/8.6mm) diameter bar stock, and shall be closed by welding; zinc coating shall be done after
welding. A thimble capable of accommodating a rope of the circumference as specified in table lV shall
be fitted to the second pear-shaped link. The thimble shall be in accordance with type I of FF-T-276.
TABLE IV. Circumference of rope for thimble sizes 3 and 4.
Circumference of
Size
rope for thimble
inches (mm)
3
3 (76)
4
1.5 (38)
3.3.5 Size 5. The nominal weight of size 5 grapnel shall be 2 pounds (.9kgs). The size 5 grapnel
shall be made of steel conforming to ASTM A108. The dimensions and details of construction shall be as
accordance with AWS A5.1/A5.1M.
3.3.6 Nonmagnetic chain links and thimbles. Nonmagnetic 1/4 inch (.25in/152mm) chain and pear-
shaped connecting links shall be made in accordance with MIL-C-24707/4 or ASTM A128/A128M grade A
type A (rough ground or pickled), or type B (galvanized) or ASTM A276, type 316. Nonmagnetic thimbles
shall be made in accordance with MIL-C-24707/4 or ASTM A128/A128M grade A type A (rough ground
or pickled), or type B (galvanized) or ASTM A276, type 316. Welding for stainless steel parts, shall be
accomplished with electrodes in accordance with AWS A5.9/A5.9M.
3.3.7 Welding. Welding for steel shall be accomplished with electrodes in accordance with AWS
A5.1/A5.1M. Welding for stainless steel parts, shall be accomplished with electrodes in accordance with
AWS A5.9/A5.9M.
3.3.8 Type III, trip wire.
3.3.8.1 Size 1. Trip wire grapnels shall be made of steel conforming to MIL-S-22698 Grapnels shall
have three prongs and be of a nominal weight of 26 ounces. The dimensions and assembly details shall
be as shown on figure 6.
6
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