MS3057 at a glance
Where to buy
Specification
| Item | Value |
|---|---|
| Type | Cable clamp, electrical connector |
| Material | Type A: aluminum alloy, QQ-A-591 alloy no. 13. Types B and C: body aluminum alloy (QQ-A-225/5 temper T4, QQ-A-601 or QQ-A-591, alloy no. 13, 218, 380 or SC114A), sleeve aluminum (AMS4025 or QQ-A-225), gland rubber AMS3209 (durometer A 70 ±5), retaining ring brass SAE 70, hard temper; type C clamping bars aluminum QQ-A-250/8 temper H32. Type D: body and saddle aluminum alloy QQ-A-591 (comp. 13, 380 or A380), clamp screws AISI 300 series stainless steel. |
| Finish | Type A per MIL-C-5015. Types B and C: body, screws and washers cadmium plate QQ-P-416 type II class 3, dull olive drab, electrically conductive; sleeve per MIL-C-5541. Type D by finish code. |
| Status | Inactive for design after 1 July 1982; the standard directs MIL-C-85049/1, /2, /41 and /42 and states its cancellation after 1 July 1984. Check the current issue before design use. |
Dimensions by size
| Dimension, in | -3A | -4A | -6A | -8A | -10A | -12A | -16A | -20A | -24A | -28A | -32A | -40A |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A — A thread | .500-28 UNEF-2B | .625-24 UNEF-2B | .750-20 UNEF-2B | .875-20 UNEF-2B | 1.000-20 UNEF-2B | 1.188-18 UNEF-2B | 1.438-18 UNEF-2B | 1.750-18 UNS-2B | 2.000-18 UNS-2B | 2.250-16 UN-2B | 2.500-16 UN-2B | 3.000-16 UN-2B |
| B — B, max | .250 | .312 | .438 | .562 | .625 | .750 | .938 | 1.250 | 1.375 | 1.625 | 1.875 | 2.375 |
| C — C | .047 | .062 | .078 | .109 | .125 | .156 | .188 | .250 | .297 | .328 | .375 | .453 |
| D — D | .406 | .406 | .406 | .406 | .406 | .406 | .406 | .469 | .531 | .531 | .594 | .656 |
| E — E dia, ±.031 | .688 | .812 | .969 | 1.094 | 1.188 | 1.375 | 1.656 | 2.031 | 2.219 | 2.500 | 2.781 | 3.281 |
| F — F, ±.031 | .812 | .875 | 1.062 | 1.156 | 1.250 | 1.469 | 1.688 | 2.031 | 2.281 | 2.688 | 2.938 | 3.500 |
| G — G, ±.031 | .812 | .812 | .875 | .938 | .938 | .938 | 1.031 | 1.094 | 1.156 | 1.688 | 1.750 | 1.750 |
| Shell size (ref.) | 8S and 10S | 10SL, 12S and 12 | 14S and 14 | 16S and 16 | 18 | 20 and 22 | 24 and 28 | 32 | 36 | 40 | 44 | 48 |
| Bushing (ref.) | MS3420-3 | MS3420-4 | MS3420-6 | MS3420-8 | MS3420-10 | MS3420-12 | MS3420-16 | MS3420-20 | MS3420-24 | MS3420-28 | MS3420-32 | MS3420-40 |
Type A, dimensions in inches; letters as on the standard's drawing. Types B, C and D follow below.
Part numbers
Every part number by type and dash number; type D by dash number and finish code. The standard governs.
8S and 10S3 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-3A | A | — | MS3420-3 |
| MS3057-3B | B | — | MS3420-3A |
| MS3057-3C | C | — | MS3420-3A |
10SL, 12S and 123 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-4A | A | — | MS3420-4 |
| MS3057-4B | B | — | MS3420-4A |
| MS3057-4C | C | — | MS3420-4A |
14S and 143 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-6A | A | — | MS3420-6 |
| MS3057-6B | B | — | MS3420-6A |
| MS3057-6C | C | — | MS3420-6A |
16S and 163 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-8A | A | — | MS3420-8 |
| MS3057-8B | B | — | MS3420-8A |
| MS3057-8C | C | — | MS3420-8A |
183 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-10A | A | — | MS3420-10 |
| MS3057-10B | B | — | MS3420-10A |
| MS3057-10C | C | — | MS3420-10A |
20 and 223 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-12A | A | — | MS3420-12 |
| MS3057-12B | B | — | MS3420-12A |
| MS3057-12C | C | — | MS3420-12A |
24 and 283 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-16A | A | — | MS3420-16 |
| MS3057-16B | B | — | MS3420-16A |
| MS3057-16C | C | — | MS3420-16A |
323 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-20A | A | — | MS3420-20 |
| MS3057-20B | B | — | MS3420-20A |
| MS3057-20C | C | — | MS3420-20A |
363 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-24A | A | — | MS3420-24 |
| MS3057-24B | B | — | MS3420-24A |
| MS3057-24C | C | — | MS3420-24A |
403 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-28A | A | — | MS3420-28 |
| MS3057-28B | B | — | MS3420-28A |
| MS3057-28C | C | — | MS3420-28A |
443 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-32A | A | — | MS3420-32 |
| MS3057-32B | B | — | MS3420-32A |
| MS3057-32C | C | — | MS3420-32A |
482 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-40A | A | — | MS3420-40 |
| MS3057-40B | B | — | MS3420-40A |
4D5 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-4DA | D | A | — |
| MS3057-4DC | D | C | — |
| MS3057-4DN | D | N | — |
| MS3057-4DD | D | D | — |
| MS3057-4DS | D | S | — |
6D5 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-6DA | D | A | — |
| MS3057-6DC | D | C | — |
| MS3057-6DN | D | N | — |
| MS3057-6DD | D | D | — |
| MS3057-6DS | D | S | — |
8D5 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-8DA | D | A | — |
| MS3057-8DC | D | C | — |
| MS3057-8DN | D | N | — |
| MS3057-8DD | D | D | — |
| MS3057-8DS | D | S | — |
10D5 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-10DA | D | A | — |
| MS3057-10DC | D | C | — |
| MS3057-10DN | D | N | — |
| MS3057-10DD | D | D | — |
| MS3057-10DS | D | S | — |
12D5 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-12DA | D | A | — |
| MS3057-12DC | D | C | — |
| MS3057-12DN | D | N | — |
| MS3057-12DD | D | D | — |
| MS3057-12DS | D | S | — |
16D5 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-16DA | D | A | — |
| MS3057-16DC | D | C | — |
| MS3057-16DN | D | N | — |
| MS3057-16DD | D | D | — |
| MS3057-16DS | D | S | — |
20D5 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-20DA | D | A | — |
| MS3057-20DC | D | C | — |
| MS3057-20DN | D | N | — |
| MS3057-20DD | D | D | — |
| MS3057-20DS | D | S | — |
24D5 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-24DA | D | A | — |
| MS3057-24DC | D | C | — |
| MS3057-24DN | D | N | — |
| MS3057-24DD | D | D | — |
| MS3057-24DS | D | S | — |
28D5 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-28DA | D | A | — |
| MS3057-28DC | D | C | — |
| MS3057-28DN | D | N | — |
| MS3057-28DD | D | D | — |
| MS3057-28DS | D | S | — |
32D5 part numbers
| Part no. | Type | Finish code | Bushing (ref.) |
|---|---|---|---|
| MS3057-32DA | D | A | — |
| MS3057-32DC | D | C | — |
| MS3057-32DN | D | N | — |
| MS3057-32DD | D | D | — |
| MS3057-32DS | D | S | — |
Part number
What each code means
| Part | Meaning |
|---|---|
| Format | MS3057-<dash><finish> |
| A | Finish: Cadmium plate, QQ-P-416 type II class 3, over nickel; olive drab |
| C | Finish: Cadmium plate, QQ-P-416 type II class 3; olive drab |
| N | Finish: Electroless nickel, MIL-C-26074 class 3 or 4, grade B |
| D | Finish: Nonmagnetic CRES (QQ-S-763, 300 series): cadmium plate, QQ-P-416 type II class 3, black |
| S | Finish: Nonmagnetic CRES (QQ-S-763, 300 series): passivated |
| Example | MS3057-16DA — Type D clamp, dash 16D, finish A (cadmium plate over nickel, olive drab) |
Type B, cable seal, grounding: dimensions
| Dash | Shell size (ref.) | A +.031 −.016 | C, max | D dia (gland) +.000 −.020 | F dia +.020 −.000 | H dia +.000 −.020 | K, max | L, min | M ±.031 | N | P ±2° | R, min |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| -3B | 8S and 10S | .188 | .812 | .389 | .231 | .441 | 1.031 | .156 | .473 | .254 | 20° | .531 |
| -4B | 10SL, 12S and 12 | .188 | .937 | .510 | .315 | .560 | 1.031 | .156 | .473 | .254 | 20° | .531 |
| -6B | 14S and 14 | .188 | 1.062 | .627 | .440 | .676 | 1.031 | .156 | .473 | .254 | 30° | .531 |
| -8B | 16S and 16 | .188 | 1.188 | .744 | .515 | .800 | 1.031 | .156 | .473 | .254 | 30° | .531 |
| -10B | 18 | .188 | 1.312 | .870 | .614 | .926 | 1.094 | .156 | .537 | .281 | 30° | .531 |
| -12B | 20 and 22 | .250 | 1.562 | 1.037 | .738 | 1.107 | 1.219 | .156 | .625 | .320 | 30° | .531 |
| -16B | 24 and 28 | .250 | 1.750 | 1.286 | .926 | 1.357 | 1.219 | .156 | .662 | .344 | 30° | .531 |
| -20B | 32 | .312 | 2.250 | 1.590 | 1.200 | 1.670 | 1.344 | .156 | .662 | .406 | 35° | .562 |
| -24B | 36 | .312 | 2.375 | 1.844 | 1.363 | 1.920 | 1.547 | .156 | .940 | .406 | 35° | .781 |
| -28B | 40 | .312 | 2.625 | 2.083 | 1.611 | 2.162 | 1.547 | .156 | .940 | .406 | 35° | .781 |
| -32B | 44 | .375 | 2.812 | 2.332 | 1.865 | 2.412 | 1.734 | .188 | 1.047 | .500 | 35° | .781 |
| -40B | 48 | .375 | 3.312 | 2.832 | 2.365 | 2.912 | 1.781 | .188 | 1.047 | .500 | 35° | .781 |
Type B, cable seal, grounding: screws, threads and gland
| Dash | S | T | U thread | V thread | W, min | X | Z dia, approx., free | Z dia, approx., closed | Bushing (ref.) | Max cable dia |
|---|---|---|---|---|---|---|---|---|---|---|
| -3B | .200 | .641 | 6-32 UNC-2A | .500-28 UNEF-2B | .281 | .025 +.010 −.003 | .219 | .031 | MS3420-3A | .219 |
| -4B | .200 | .641 | 6-32 UNC-2A | .625-24 UNEF-2B | .281 | .025 +.010 −.003 | .312 | .094 | MS3420-4A | .312 |
| -6B | .200 | .641 | 6-32 UNC-2A | .750-20 UNEF-2B | .281 | .025 +.010 −.003 | .438 | .250 | MS3420-6A | .438 |
| -8B | .200 | .641 | 6-32 UNC-2A | .875-20 UNEF-2B | .281 | .025 +.010 −.003 | .531 | .312 | MS3420-8A | .515 |
| -10B | .218 | .672 | 6-32 UNC-2A | 1.000-20 UNEF-2B | .281 | .032 +.012 −.003 | .625 | .375 | MS3420-10A | .614 |
| -12B | .273 | .719 | 8-32 UNC-2A | 1.188-18 UNEF-2B | .344 | .032 +.012 −.003 | .750 | .500 | MS3420-12A | .738 |
| -16B | .273 | .719 | 8-32 UNC-2A | 1.438-18 UNEF-2B | .344 | .032 +.012 −.003 | .938 | .594 | MS3420-16A | .926 |
| -20B | .273 | .797 | 10-32 UNF-2A | 1.750-18 UNS-2B | .406 | .051 ±.005 | 1.250 | .938 | MS3420-20A | 1.200 |
| -24B | .431 | 1.016 | 10-32 UNF-2A | 2.000-18 UNS-2B | .406 | .051 ±.005 | 1.375 | .969 | MS3420-24A | 1.363 |
| -28B | .431 | 1.016 | 10-32 UNF-2A | 2.250-16 UN-2B | .406 | .051 ±.005 | 1.625 | 1.188 | MS3420-28A | 1.611 |
| -32B | .500 | 1.172 | 10-32 UNF-2A | 2.500-16 UN-2B | .406 | .064 ±.005 | 1.875 | 1.375 | MS3420-32A | 1.865 |
| -40B | .500 | 1.234 | 10-32 UNF-2A | 3.000-16 UN-2B | .406 | .064 ±.005 | 2.375 | 1.875 | MS3420-40A | 2.365 |
Type C, cable seal, strain relief: dimensions
| Dash | Shell size (ref.) | A +.031 −.016 | B, min cable clearance | C, max | D dia (gland) +.000 −.020 | E, max closed | F dia +.020 −.000 | G ±.016 | H dia +.000 −.020 | J ±.020 | K, max | L, min | M ±.031 | N | P | R, min |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| -3C | 8S and 10S | .188 | .239 | .812 | .389 | .217 | .231 | .125 | .441 | .875 | 1.375 | .156 | .473 | .254 | 20° | .531 |
| -4C | 10SL, 12S and 12 | .188 | .317 | .937 | .510 | .296 | .315 | .125 | .560 | .875 | 1.375 | .156 | .473 | .254 | 20° | .531 |
| -6C | 14S and 14 | .188 | .443 | 1.062 | .627 | .390 | .440 | .125 | .676 | .875 | 1.375 | .156 | .473 | .254 | 30° | .531 |
| -8C | 16S and 16 | .188 | .551 | 1.188 | .744 | .434 | .515 | .125 | .800 | .875 | 1.375 | .156 | .473 | .254 | 30° | .531 |
| -10C | 18 | .188 | .630 | 1.312 | .870 | .434 | .614 | .125 | .926 | .927 | 1.437 | .156 | .537 | .281 | 30° | .531 |
| -12C | 20 and 22 | .250 | .771 | 1.562 | 1.037 | .596 | .738 | .156 | 1.107 | 1.016 | 1.437 | .156 | .625 | .320 | 30° | .531 |
| -16C | 24 and 28 | .250 | .959 | 1.750 | 1.286 | .596 | .926 | .156 | 1.357 | 1.037 | 1.562 | .156 | .662 | .344 | 30° | .531 |
| -20C | 32 | .312 | 1.271 | 2.250 | 1.590 | .858 | 1.200 | .188 | 1.670 | 1.167 | 1.812 | .156 | .662 | .406 | 35° | .562 |
| -24C | 36 | .312 | 1.396 | 2.375 | 1.844 | .858 | 1.363 | .188 | 1.920 | 1.386 | 2.062 | .156 | .940 | .406 | 35° | .781 |
| -28C | 40 | .312 | 1.646 | 2.625 | 2.083 | 1.107 | 1.611 | .188 | 2.162 | 1.386 | 2.062 | .156 | .940 | .406 | 35° | .781 |
| -32C | 44 | .375 | 1.896 | 2.812 | 2.332 | 1.421 | 1.865 | .188 | 2.412 | 1.480 | 2.188 | .188 | 1.047 | .500 | 35° | .781 |
E, minimum with the clamping bars fully opened, is not less than B.
Type C, cable seal, strain relief: screws, threads and gland
| Dash | S | T | U thread | V thread | W, min | X | Z dia, approx., free | Z dia, approx., closed | Bushing (ref.) | Max cable dia |
|---|---|---|---|---|---|---|---|---|---|---|
| -3C | .200 | .641 | 6-32 UNC-2A | .500-28 UNEF-2B | .469 | .025 +.010 −.003 | .219 | .031 | MS3420-3A | .219 |
| -4C | .200 | .641 | 6-32 UNC-2A | .625-24 UNEF-2B | .594 | .025 +.010 −.003 | .312 | .094 | MS3420-4A | .312 |
| -6C | .200 | .641 | 6-32 UNC-2A | .750-20 UNEF-2B | .594 | .025 +.010 −.003 | .438 | .250 | MS3420-6A | .438 |
| -8C | .200 | .641 | 6-32 UNC-2A | .875-20 UNEF-2B | .719 | .025 +.010 −.003 | .531 | .312 | MS3420-8A | .515 |
| -10C | .218 | .672 | 6-32 UNC-2A | 1.000-20 UNEF-2B | .719 | .032 +.012 −.003 | .625 | .375 | MS3420-10A | .614 |
| -12C | .273 | .719 | 8-32 UNC-2A | 1.188-18 UNEF-2B | .844 | .032 +.012 −.003 | .750 | .500 | MS3420-12A | .738 |
| -16C | .273 | .719 | 8-32 UNC-2A | 1.438-18 UNEF-2B | 1.062 | .032 +.012 −.003 | .938 | .594 | MS3420-16A | .926 |
| -20C | .273 | .797 | 1/4-20 UNC-2A | 1.750-18 UNS-2B | 1.187 | .051 ±.005 | 1.250 | .938 | MS3420-20A | 1.200 |
| -24C | .431 | 1.016 | 1/4-20 UNC-2A | 2.000-18 UNS-2B | 1.312 | .051 ±.005 | 1.375 | .969 | MS3420-24A | 1.363 |
| -28C | .431 | 1.016 | 1/4-20 UNC-2A | 2.250-16 UN-2B | 1.312 | .051 ±.005 | 1.625 | 1.188 | MS3420-28A | 1.611 |
| -32C | .500 | 1.172 | 1/4-20 UNC-2A | 2.500-16 UN-2B | 1.312 | .064 ±.005 | 1.875 | 1.375 | MS3420-32A | 1.865 |
Type D, cable clamp, heavy duty, high shock: dimensions
| Dash | A thread, class 2A | B dia, max | C ±.010 | D ±.020 | E +.000 −.007 | F ±.010 | G ±.020 | H clamp range, min | H clamp range, max | J dia ±.010 | K ±.010 | M ±.010 | N ±.010 | P ±.005 | Test plug dia, min | Test plug dia, max | Pull-out load, lb | Clamp size range |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| -4D | .625-24 UNEF | .937 | .637 | .937 | .250 | .312 | 1.281 | .125 | .312 | .218 | .062 | .156 | .109 | .166 | .109 | .125 | 25 | 1 |
| -6D | .750-20 UNEF | 1.031 | .763 | 1.125 | .250 | .375 | 1.281 | .250 | .437 | .281 | .062 | .175 | .125 | .166 | .234 | .250 | 25 | 1 |
| -8D | .875-20 UNEF | 1.250 | .942 ±.032 | 1.312 | .250 | .422 ±.026 | 1.281 | .312 | .562 | .312 | .062 | .211 ±.018 | .125 | .166 | .296 | .312 | 50 | 1 |
| -10D | 1.000-20 UNEF | 1.250 | .964 | 1.312 | .250 | .437 | 1.281 | .350 | .625 | .312 | .062 | .218 | .125 | .166 | .334 | .350 | 50 | 1 |
| -12D | 1.188-18 UNEF | 1.437 | 1.130 | 1.531 | .250 | .437 | 1.312 | .500 | .750 | .375 | .062 | .250 | .156 | .192 | .484 | .500 | 50 | 2 |
| -16D | 1.438-18 UNEF | 1.688 | 1.375 | 1.750 | .250 | .531 | 1.406 | .625 | .937 | .375 | .062 | .250 | .188 | .192 | .609 | .625 | 75 | 2 |
| -20D | 1.750-18 UNS | 2.000 | 1.703 | 2.093 | .312 | .531 | 1.593 | .875 | 1.250 | .475 | .078 | .312 | .188 | .217 | .859 | .875 | 75 | 2 |
| -24D | 2.000-18 UNS | 2.250 | 1.906 | 2.343 | .312 | .531 | 1.625 | 1.000 | 1.375 | .500 | .093 | .312 | .250 | .217 | .984 | 1.000 | 75 | 3 |
| -28D | 2.250-16 UN | 2.500 | 2.218 | 2.750 | .312 | .812 | 1.900 | 1.250 | 1.625 | .625 | .093 | .312 | .375 | .217 | 1.234 | 1.250 | 100 | 3 |
| -32D | 2.500-16 UN | 2.750 | 2.500 | 3.000 | .312 | .812 | 1.900 | 1.437 | 1.875 | .675 | .125 | .312 | .375 | .217 | 1.421 | 1.437 | 100 | 3 |
Unless otherwise specified, tolerances: two-place decimals ±.01, three-place decimals ±.005; angles in whole degrees ±1°00', in degrees and minutes ±0°30'.
Notes from the standard
- Types A, B and C: dimensions in inches; unless otherwise specified, tolerances ±.016 and angles ±2°. Threads per MIL-S-7742.
- The clamp mates with the connector shell size listed (reference). Types A, B and C carry no finish code; type D adds the finish code after the dash number.
- MS3057-3A to -40A are interchangeable with AN3057-3A to -40A, and MS3057-3B to -40B with AN3057-3B to -40B.
- Type A bushings are for reference and are not supplied with the clamp. For additional close-down of B: one bushing for MS3057-3A to -12A (MS3420-3 to -12); two for -16A to -24A (MS3057-16A takes one MS3420-16 and one MS3420-12); three for -28A to -40A (MS3057-40A takes one MS3420-40, one MS3420-32 and one MS3420-28).
- Types B and C: for additional close-down of Z, bushings MS3420-3A to MS3420-40A may be used; diameter Z is free of obstructions. Lubricant VV-P-236 on the threads and sleeve surfaces; retaining ring bonded in the rubber gland.
- Type D: cables do not pull out under the tabulated loads and slippage does not exceed .125. Relative magnetic permeability below 2.0 (MIL-I-17214); vibration per MIL-STD-167-1 and MIL-STD-202 method 204, condition B; shock per MIL-S-901, grade A; no safety wire.
- Approved data governs. Use the part the drawing, SRM or IPC calls for.
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Sources
- MS3057 Rev. E, 10 May 1982 — Clamps, Cable, Electrical Connector — dimensions, part numbers and notes. Public domain, distribution unlimited.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.