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MS3420 — telescoping bushing, connector cable clamp to cable

MS3420: telescoping bushings that adapt a connector cable clamp to the cable. Flanged and plain bushings by dash number, with material codes and the numbers they supersede.

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MS3420 at a glance

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MS3420 engineering drawing with dimensions
Engineering drawing · dimensions in inches

Specification

ItemValue
TypeTelescoping bushing, cable clamp to cable
MaterialFlanged bushings: rubber per MIL-STD-417. Plain bushings by material code: A rubber per MIL-STD-417 (black), D silicone rubber per ZZ-R-765 class 3a or 3b (red), L fluorosilicone rubber per ZZ-R-765 class 2a or 2b, grade 50 (blue).
StatusCancelled by Notice 4 (December 2009) and replaced by SAE-AS85049/139; inactive for new design before that. Check the current issue before design use.

Dimensions by size

Dimension, in-3-4-6-8-10-12-16-20-24-28-32-40
A — A dia (inside).130.220.312.437.562.625.750.9371.2501.3751.6241.874
B — B dia (outside).210.302.427.552.615.740.9271.2401.3651.6141.8642.364
C — C dia (flange).379.505.619.744.8891.0841.3141.5981.8472.0852.3352.835
D — D (length)2.8752.7502.6252.5002.3752.2502.1252.0001.8751.7501.6251.500
E, F and G radius.031.031.031.062.062.062.062.062.062.062.062.062
Supersedes AN3420 dash no. (ref.)-3-4-6-8-10-12-16-20-24-28-32-40
Supersedes MS39056 dash no. (ref.)-1-2-3-4-5-6-7-8-9-10-11-12

Flanged bushings (sheet 1), dimensions in inches; letters as on the standard's drawing. Plain bushings follow below.

Part numbers

Every part number: flanged bushings by dash number, plain bushings by dash number and material code. The standard governs.

.1301 part number

Part no.FormMaterial code
MS3420-3Flanged (sheet 1)—

.2201 part number

Part no.FormMaterial code
MS3420-4Flanged (sheet 1)—

.3124 part numbers

Part no.FormMaterial code
MS3420-6Flanged (sheet 1)—
MS3420-6APlain (sheet 2)A
MS3420-6DPlain (sheet 2)D
MS3420-6LPlain (sheet 2)L

.4371 part number

Part no.FormMaterial code
MS3420-8Flanged (sheet 1)—

.5621 part number

Part no.FormMaterial code
MS3420-10Flanged (sheet 1)—

.6251 part number

Part no.FormMaterial code
MS3420-12Flanged (sheet 1)—

.7504 part numbers

Part no.FormMaterial code
MS3420-16Flanged (sheet 1)—
MS3420-16APlain (sheet 2)A
MS3420-16DPlain (sheet 2)D
MS3420-16LPlain (sheet 2)L

.9371 part number

Part no.FormMaterial code
MS3420-20Flanged (sheet 1)—

1.2504 part numbers

Part no.FormMaterial code
MS3420-24Flanged (sheet 1)—
MS3420-28APlain (sheet 2)A
MS3420-28DPlain (sheet 2)D
MS3420-28LPlain (sheet 2)L

1.3751 part number

Part no.FormMaterial code
MS3420-28Flanged (sheet 1)—

1.6241 part number

Part no.FormMaterial code
MS3420-32Flanged (sheet 1)—

1.8741 part number

Part no.FormMaterial code
MS3420-40Flanged (sheet 1)—

.1253 part numbers

Part no.FormMaterial code
MS3420-3APlain (sheet 2)A
MS3420-3DPlain (sheet 2)D
MS3420-3LPlain (sheet 2)L

.2193 part numbers

Part no.FormMaterial code
MS3420-4APlain (sheet 2)A
MS3420-4DPlain (sheet 2)D
MS3420-4LPlain (sheet 2)L

.4386 part numbers

Part no.FormMaterial code
MS3420-8APlain (sheet 2)A
MS3420-8DPlain (sheet 2)D
MS3420-8LPlain (sheet 2)L
MS3420-10APlain (sheet 2)A
MS3420-10DPlain (sheet 2)D
MS3420-10LPlain (sheet 2)L

.5413 part numbers

Part no.FormMaterial code
MS3420-12APlain (sheet 2)A
MS3420-12DPlain (sheet 2)D
MS3420-12LPlain (sheet 2)L

.9386 part numbers

Part no.FormMaterial code
MS3420-18APlain (sheet 2)A
MS3420-18DPlain (sheet 2)D
MS3420-18LPlain (sheet 2)L
MS3420-20APlain (sheet 2)A
MS3420-20DPlain (sheet 2)D
MS3420-20LPlain (sheet 2)L

1.1253 part numbers

Part no.FormMaterial code
MS3420-24APlain (sheet 2)A
MS3420-24DPlain (sheet 2)D
MS3420-24LPlain (sheet 2)L

1.6253 part numbers

Part no.FormMaterial code
MS3420-32APlain (sheet 2)A
MS3420-32DPlain (sheet 2)D
MS3420-32LPlain (sheet 2)L

1.8753 part numbers

Part no.FormMaterial code
MS3420-40APlain (sheet 2)A
MS3420-40DPlain (sheet 2)D
MS3420-40LPlain (sheet 2)L

Part number

What each code means

PartMeaning
FormatMS3420-<dash><material>
AMaterial: Rubber, MIL-STD-417 (black)
DMaterial: Silicone rubber, ZZ-R-765 class 3a or 3b (red)
LMaterial: Fluorosilicone rubber, ZZ-R-765 class 2a or 2b, grade 50 (blue)
ExampleMS3420-20L — Plain bushing, dash 20, fluorosilicone rubber

Plain bushings (sheet 2): dimensions

DashA diaB diaLengthSupersedes AN3420 (ref.)Supersedes MS39057 (ref.)
-3.125.2102.000 ±.031-3A-1
-4.219.3022.000 ±.031-4ANone
-6.312.4272.000 ±.031-6A-3
-8.438.5312.000 ±.031-8A-4
-10.438.6152.000 ±.031-10A-5
-12.541.7402.000 ±.031-12A-6
-16.750.9272.000 ±.031-16A-7
-18.9381.1152.000 ±.031-18A-8
-20.9381.2402.000 ±.031-20A-9
-241.1251.3652.000 ±.031-24A-10
-281.2501.6142.000 ±.031-28A-11
-321.6251.8652.000 ±.031-32A-12
-401.8752.3652.000 ±.031-40A-13

Tolerances ±.016 unless otherwise specified. Dash -4: the MS39057 number is left blank, not legible on the scan of the standard.

Notes from the standard

  • Dimensions in inches. Flanged bushings: unless otherwise specified, tolerances ±1/32 on fractions and ±.016 on decimals; plain bushings ±.016.
  • Flanged bushings (sheet 1) carry no material code; plain bushings (sheet 2) add the material code after the dash number.
  • Flanged bushings are for use with cable clamps MS3057-3A to -40A and MS3057-3C to -40C; plain bushings with MS3057-3B to -40B, MS3057-3C to -40C, MS3415, MS3417 and MS3418.
  • Approved data governs. Use the part the drawing, SRM or IPC calls for.

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Calculators

CalculatorPart Number Equivalent Cross-Reference & DecoderType any MS3420 number and see its other names.

Data sheets

Data sheetElectrical partsThe family side by side.Data sheetMS3373Strip, Mounting, Insulating, Nut, for MS27212 Terminal BoardData sheetSPBSPN, SPB and SW Spiral Wrap

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Sources

Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.
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