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MIL-DTL-87218 Cable, Lockclad, For Aircraft ControlThis specification covers the requirements for lockclad control cable material used in aircraft flight controls and aircraft control cable assemblies that include lockclad as a portion of the assembly. Lockclad is defined as the resulting material of swaging aluminum alloy tubing onto MIL-DTL-83420, type I, nonjacketed wire rope to the extent necessary to comply with the elongation and coefficient of thermal expansion properties specified herein.

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MIL-DTL-87218E
TABLE I. Lockclad classes and physical properties.
Base wire rope 1/
Finished lockclad
Lockclad
Class
Diameter
Construction
cladding diameter
weight
identity
Nominal
Minimum
(reference)
inch + 0.003
maximum
(reference)
lbs./100 ft.
2A
1/16
0.062
7X7
0.1495
2.60
2B
1/16
0.062
7X7
0.1695
3.10
3A
3/32
0.093
7X7
0.1695
3.80
3B
3/32
0.093
7X7
0.2010
4.80
3C
3/32
0.093
7 X 19
0.1695
3.80
3D
3/32
0.093
7 X 19
0.2010
4.80
4A
1/8
0.125
7 X 19
0.2010
5.56
4B
1/8
0.125
7 X 19
0.2500
7.45
5A
5/32
0.156
7 X 19
0.2500
8.61
5B
5/32
0.156
7 X 19
0.2950
10.71
6A
3/16
0.187
7 X 19
0.2500
9.71
6B
3/16
0.187
7 X 19
0.2700
11.02
6C
3/16
0.187
7 X 19
0.2950
12.02
6D
3/16
0.187
7 X 19
0.3020
12.49
8A
1/4
0.250
7 X 19
0.3320
17.43
8B
1/4
0.250
7 X 19
0.3580
19.32
8C
1/4
0.250
7 X 19
0.3750
20.47
1/ Wire rope per MIL-DTL-83420 type I composition A or B.
TABLE II. Lockclad performance properties.
Maximum percent
Minimum SV value at designated load
Coefficient of thermal
elongation at
expansion (minimum)
Class
32 - 80 °F
x 103 (lb-inch2/inch2)
designated load
(in./in. x 10-6 per °F)
Type I lockclad 1/
Type II lockclad 1/
5% MBS
60% MBS
5% MBS
60% MBS
5% MBS
60% MBS
Type I 1/
Type II 1/
2A
.06
.4
111
166
111
166
11.9
12.2
2B
.06
.4
144
216
144
216
12.4
12.4
3A
.06
.4
165
247
157
235
11.1
11.3
3B
.06
.4
213
320
209
314
11.8
12.0
3C
.06
.4
165
247
157
235
11.1
11.3
3D
.06
.4
213
320
209
314
11.8
12.0
4A
.06
.4
237
355
228
343
10.4
10.5
4B
.06
.4
330
495
322
483
11.5
11.5
5A
.06
.4
372
558
362
543
10.6
10.7
5B
.06
.4
459
689
449
674
11.4
11.4
6A
.06
.4
402
603
382
573
9.3
9.3
6B
.06
.4
452
678
432
655
9.8
10.1
6C
.06
.4
501
751
482
723
10.3
10.4
6D
.06
.4
534
801
515
773
10.6
10.7
8A
.06
.4
720
1080
680
1019
9.5
9.7
8B
.06
.4
780
1170
741
1112
10.0
10.2
8C
.06
.4
870
1305
830
1246
10.3
10.4
1/ Type I or II lockclad as specified herein; not to be confused with type I or II wire rope per MIL-DTL-83420. All wire rope
used in the manufacture of lockclad is type I per MIL-DTL-83420.
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