MIL-DTL-613D
3.2 Materials. Materials shall be as identified herein or as approved by the acquiring activity.
Acceptance or approval of any constituent material shall not be construed as a guarantee of acceptance
of the finished product.
3.2.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
3.2.2 Hazardous substances. The use of hazardous substances, toxic chemicals, or ozone depleting
chemicals shall be avoided, whenever feasible.
3.2.3 Other materials. Materials not otherwise specified shall be in accordance with applicable
specifications and to the requirements specified herein. All materials that are not specifically described
shall be of the highest quality and suitable for the purpose intended.
3.3 Construction.
3.3.1 Type I, heavy marine. Type I grapnels shall be made of steel conforming to ASTM A27/A27M
and ASTM A148/A148M grapnels shall be in accordance with table II and figures 1, 2, and 3 for sizes 1,
2, and 3, respectively. When specified the grapnel may be furnished without shackles. The eye for the
tripping line shall be of forged steel conforming to MIL-S-22698 or SAE-AMS6350 and shall be welded to
the base of the shank. Shackles shall conform to type IV, class 1 of RR-C-271.
TABLE II. Type 1 grapnels.
Nominal
Size
Number
weight
of shackle
Size
of prongs
Pounds (kg)
Inches (mm)
1
4
450 (204)
1-3.8 (35)
2
5
225(102)
1 (25)
3
3
170(77)
1(25)
3.3.2 Type II, light marine. Sizes 1, 2, 3 and 4 grapnels shall have five prongs equally spaced around
the shank and size 5 grapnel shall have 3 prongs equally spaced around the shank. Class 1 grapnels
shall be made of steel as specified in MIL-S-24093 or SAE-AMS6349 or SAE-AMS6346, or
SAE-AMS6348, or SAE-AMS5349, SAE-AMS6370, or SAE-AMS6382 or SAE-AMS6528 where minimum
tensile strength is 120,000 psi. Except to use MIL-S-24093, class A, when minimum yield strength must
be 140,000 psi.
3.3.2.1 Nonmagnetic grapnels. Class 2 grapnels shall be made of nonmagnetic material conforming
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.
3.3.3 Sizes 1 and 2. The nominal weight of size 1 grapnels shall be 100 pounds (45kgs), and size 2
grapnels shall be 50 pounds (23kgs). The grapnels shall be constructed in accordance with figure 4. The
eye shall be fitted with a thimble capable of accommodating a rope of the circumference as specified in
table III. Thimble shall be in accordance with type I of FF-T-276. The eye for the tripping line shall be
welded to the base of the shank.
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business