MIL-DTL-24749B(SH)
ASTM F593
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Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and
Studs
(Copies of these documents are available online at www.astm.org.)
SAE INTERNATIONAL
SAE-AMS-QQ-S-763
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Steel, Corrosion Resistant, Bars, Wire, Shapes, and Forgings
(Copies of this document are available from SAE World Headquarters, 400 Commonwealth Drive, Warrendale, PA
15096-0001 or online at www.sae.org.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between
the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this
document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.3), a sample shall be subjected to first article inspection in accordance
with 4.3.
3.2 Materials and components. The materials and components shall conform to applicable specifications,
standards, and figures required herein. Items comprised of specialty materials (i.e., CRES 316/316L) shall be
DFARS 252.225-7009 compliant.
3.2.1 Type I bond strap. A Type I bond strap shall consist of three components:
a.
One annealed CRES 316, UNS S31600, ¼-inch diameter stranded wire cable, or wire rope.
b.
Two end lugs formed from CRES 316L, UNS S31600, schedule 40S pipe (see figure 1, detail A).
3.2.1.1 Stranded wire rope. Stranded wire rope shall be ¼-inch diameter CRES 316, UNS S31600, of 7-by-19
construction (see figure 1, detail B). Wire used to construct the wire rope shall be in accordance with ASTM A492.
Wire rope of this construction shall consist of 6 outer strands of 19 wires each laid around a strand core of 19 wires.
The 6 outer strands shall each consist of a layer of 6 wires laid around a center wire in a left-hand direction and a
layer of 12 wires laid over the 7-wire strand in a left-hand direction. The strand core shall consist of a layer of 6
wires laid around a center wire in a right-hand direction and a layer of 12 wires laid around the 7-wire strand in the
right-hand direction. The 6 outer strands shall be laid around the core in a right-hand direction. The length of lay of
the inside layer of 6 wires in each of the 6 outer strands and the one strand core shall not exceed 60 percent of the
outside layer of 12 wires in each strand. The length of lay of the outside layer of 12 wires in each of the 6 outside
strands and the strand core shall not exceed 50 percent of the lay of the finished wire rope. The length of the lay of
the finished wire rope shall be not more than 2 inches nor less than 1.5 inches. The finished wire rope shall be
annealed. The method of annealing of the wire rope shall be the strand annealing process. There shall be a
hydrogen protective atmosphere within the annealing tube to eliminate the chance of oxidization of the surface of
the wire rope and premature failure of the grounding strap due to corrosion. Annealing temperature shall be
2,000±50 °F. Through put speed shall be 2.5±0.5 feet per minute. Breaking strength of the fully annealed wire rope
shall be between 2,000 and 3,000 pounds. Minimum elongation shall be 30 percent in a 12-inch gauge length. This
wire rope shall have no residual martensitic/magnetic properties.
3.2.1.2 Lugs. Lugs shall be made of 0.405-inch outside diameter (O.D.) and 0.269-inch inside diameter (I.D.)
CRES 316L, UNS S31603 schedule 40S pipe in accordance with ASTM A312/A312M. The lugs shall be formed
from the blank pipe as follows: prepare pipe by cutting 1½-inch length; insert stranded wire cable or wire rope
through entire 1½-inch length of pipe; compress the end ¾ inch of the pipe to 0.20±0.01-inch thickness and ensure
that both mounting surfaces of the lug are smooth and flat; burnish the end to remove sharp edges and drill a
/32±0.001-inch hole in the lug to facilitate a 3/8-inch bolt.
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3.2.2 Boss. Bosses used with Type I bond straps shall be 5/8-inch diameter in either of two different types:
CRES 316L, UNS S31603 in accordance with SAE-AMS-QQ-S-763; or bimetallic (CRES 316L/Aluminum) in
accordance with MIL-J-24445. Dimensions associated with bosses shall be in accordance with figure 2. Bosses
shall be either conventional or arc weld studs. Arc weld studs shall be in accordance with MIL-S-24149. Each boss
shall contain a CRES 316 bolt (hex cap screw) in accordance with paragraph 3.2.2.2.
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