Circular MIL Spec Connectors

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Backshells

Amphenol PCD Backshells offer strain relief, environmental protection, and 360° EMI/RFI shielding at the termination area of virtually any circular connector. These connectors feature a base material constructed of aluminum alloy, stainless steel, brass, or composite and a variety of finishes such as black zinc nickel, cadmium, electroless nickel, anodized black, passivated, and more. Amphenol PCD Backshells have custom designs available and meet or exceed RoHS/REACH compliance standards. Available in both military specifications and commercial types for any application, these backshells meet the Society of Automotive Engineers (SAE) AS85049 standard.

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Types of Circular MIL Spec Connectors

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Part #

Circular MIL Spec Backshells 11 Backshell Env

M85049/11-112W
Amphenol PCD
1: $48.91
80In Stock

Mfr. Part No.
M85049/11-112W

Mouser Part No
523-85049/11-112W

Amphenol PCD

Circular MIL Spec Backshells 11 Backshell Env

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Datasheet

80In Stock

$48.91

$42.69

Min.: 1
Mult.: 1

Environmental Backshells

MIL-DTL-5015, MIL-DTL-26482 II

Straight

Circular MIL Spec Backshells BACKSHELL ENV ST OD CAD

M85049/11-63W
Amphenol PCD
1: $94.01
31In Stock

Mfr. Part No.
M85049/11-63W

Mouser Part No
523-85049/11-63W

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV ST OD CAD

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Datasheet

31In Stock

$94.01

Quote

Min.: 1
Mult.: 1

Environmental Backshells

MIL-DTL-5015, MIL-DTL-26482 II

Straight

Circular MIL Spec Backshells 18 Backshell Env-EMI/RFI

M85049/1811W03A
Amphenol PCD
1: $72.25
41In Stock

Mfr. Part No.
M85049/1811W03A

Mouser Part No
523-85049/1811W03A

Amphenol PCD

Circular MIL Spec Backshells 18 Backshell Env-EMI/RFI

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Datasheet

41In Stock

$72.25

$64.93

$57.68

$53.86

View

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 15

M85049/1815W04
Amphenol PCD
1: $76.71
155In Stock

Mfr. Part No.
M85049/1815W04

Mouser Part No
523-85049/1815W04

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 15

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Datasheet

155In Stock

$76.71

$71.07

$64.72

$58.56

View

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST CAD SZ 17

M85049/1917W03
Amphenol PCD
1: $75.64
34In Stock

Mfr. Part No.
M85049/1917W03

Mouser Part No
523-85049/1917W03

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST CAD SZ 17

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Datasheet

34In Stock

$75.64

$68.16

$49.78

$40.15

Quote

Min.: 1
Mult.: 1

Non-Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells 85 Backshell Band Lock

M85049/85-24W01
Amphenol PCD
1: $62.75
30In Stock

Mfr. Part No.
M85049/85-24W01

Mouser Part No
523-85049/85-24W01

Amphenol PCD

Circular MIL Spec Backshells 85 Backshell Band Lock

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Datasheet

30In Stock

$62.75

$53.34

$52.80

$50.50

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Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 I, II

Circular MIL Spec Backshells BACKSHELL ENV R/A OD CAD

M85049/9-3W
Amphenol PCD
1: $34.53
71In Stock

Mfr. Part No.
M85049/9-3W

Mouser Part No
523-85049/9-3W

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV R/A OD CAD

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Datasheet

71In Stock

$34.53

$33.03

$29.51

$23.69

$22.35

Min.: 1
Mult.: 1

Environmental Backshells

MIL-DTL-5015, MIL-DTL-26482 II

Right Angle

Circular MIL Spec Backshells BACKSHELL

A850498811Z03
Amphenol PCD
1: $54.50
23In Stock

Mfr. Part No.
A850498811Z03

Mouser Part No
523-A850498811Z03

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL

Datasheet

23In Stock

$54.50

$46.54

$44.75

$43.25

View

Min.: 1
Mult.: 1

Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A OD CAD SZ 13

M85049/79-13W02
Amphenol PCD
1: $56.38
45In Stock

Mfr. Part No.
M85049/79-13W02

Mouser Part No
523-85049/79-13W02

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A OD CAD SZ 13

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Datasheet

45In Stock

$56.38

$55.25

$47.39

Quote

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

90 Deg

Circular MIL Spec Backshells 79 Backshell Env-EMI/RFI

M85049/79-25W07
Amphenol PCD
1: $79.81
21In Stock

Mfr. Part No.
M85049/79-25W07

Mouser Part No
523-85049/79-25W07

Amphenol PCD

Circular MIL Spec Backshells 79 Backshell Env-EMI/RFI

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Datasheet

21In Stock

$79.81

$76.39

$70.21

Quote

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

90 Deg

Circular MIL Spec Backshells 95 Backshell Mounting flange

A850499518A
Amphenol PCD
1: $27.83
20In Stock

Mfr. Part No.
A850499518A

Mouser Part No
523-A850499518A

Amphenol PCD

Circular MIL Spec Backshells 95 Backshell Mounting flange

Datasheet

20In Stock

$27.83

$26.69

$23.63

$22.91

$22.62

Min.: 1
Mult.: 1

Accessories

MIL-DTL-5015, MIL-DTL-26482 II

Circular MIL Spec Backshells Straight Shell size 8 Black Zinc Nickel w/ Exposed Nickel Entry Size 3

M85049/82-08ZP03
Amphenol PCD
1: $54.76
3In Stock
25Expected 08/06/2026

Mfr. Part No.
M85049/82-08ZP03

Mouser Part No
523-M85049/82-08ZP03

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 8 Black Zinc Nickel w/ Exposed Nickel Entry Size 3

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Datasheet

3In Stock

25Expected 08/06/2026

$54.76

$47.48

$45.65

$44.13

View

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-5015, MIL-DTL-26482 II

Straight

Circular MIL Spec Backshells BACKSHELL ENV ST OD CAD

M85049/11-39W
Amphenol PCD
1: $74.37
21In Stock

Mfr. Part No.
M85049/11-39W

Mouser Part No
523-85049/11-39W

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV ST OD CAD

Learn More

Datasheet

21In Stock

$74.37

$71.27

$68.46

$63.44

View

Min.: 1
Mult.: 1

Environmental Backshells

MIL-DTL-5015, MIL-DTL-26482 II

Straight

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 17

M85049/1817W05A
Amphenol PCD
1: $103.12
24In Stock

Mfr. Part No.
M85049/1817W05A

Mouser Part No
523-85049/1817W05A

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 17

Learn More

Datasheet

24In Stock

$103.12

$95.41

$57.48

$48.49

Quote

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST CAD SZ 17

M85049/1917W05
Amphenol PCD
1: $50.32
45In Stock

Mfr. Part No.
M85049/1917W05

Mouser Part No
523-85049/1917W05

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST CAD SZ 17

Learn More

Datasheet

45In Stock

$50.32

$49.28

$42.49

Quote

Min.: 1
Mult.: 1

Non-Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG OD CAD

M85049/6-30W
Amphenol PCD
1: $157.55
27In Stock

Mfr. Part No.
M85049/6-30W

Mouser Part No
523-85049/6-30W

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG OD CAD

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Datasheet

27In Stock

$157.55

$156.37

$156.36

Quote

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-5015, MIL-DTL-26482 II

45 Deg

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 22

M85049/10-43W
Amphenol PCD
1: $71.60
22In Stock

Mfr. Part No.
M85049/10-43W

Mouser Part No
523-85049/10-43W

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 22

Learn More

Datasheet

22In Stock

$71.60

$63.56

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-5015, MIL-DTL-26482 II

Straight

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 19

M85049/1819W07A
Amphenol PCD
1: $79.77
61In Stock

Mfr. Part No.
M85049/1819W07A

Mouser Part No
523-85049/1819W07A

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 19

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Datasheet

61In Stock

$79.77

$67.81

$58.37

$49.24

Quote

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells 79 Backshell Env-EMI/RFI

M85049/79-15W03
Amphenol PCD
1: $58.83
50In Stock

Mfr. Part No.
M85049/79-15W03

Mouser Part No
523-85049/79-15W03

Amphenol PCD

Circular MIL Spec Backshells 79 Backshell Env-EMI/RFI

Learn More

Datasheet

50In Stock

$58.83

$49.59

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

90 Deg

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A OD CAD

M85049/8-54W
Amphenol PCD
1: $43.31
31In Stock

Mfr. Part No.
M85049/8-54W

Mouser Part No
523-85049/8-54W

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A OD CAD

Learn More

Datasheet

31In Stock

$43.31

$38.76

Quote

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-5015, MIL-DTL-26482 II

Right Angle

Circular MIL Spec Backshells Backshell;Non Env-EMI/RFI;BZN

M85049/1915Z05
Amphenol PCD
1: $73.90
39In Stock

Mfr. Part No.
M85049/1915Z05

Mouser Part No
523-M850491915Z05

Amphenol PCD

Circular MIL Spec Backshells Backshell;Non Env-EMI/RFI;BZN

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Datasheet

39In Stock

$73.90

$65.69

$53.47

View

Min.: 1
Mult.: 1

Non-Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 32

M85049/10-63W
Amphenol PCD
1: $161.81
25In Stock

Mfr. Part No.
M85049/10-63W

Mouser Part No
523-85049/10-63W

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 32

Learn More

Datasheet

25In Stock

$161.81

$148.57

$120.98

$111.22

Quote

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-5015, MIL-DTL-26482 II

Straight

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A OD CAD SZ 25

M85049/79-25W08
Amphenol PCD
1: $88.56
50In Stock

Mfr. Part No.
M85049/79-25W08

Mouser Part No
523-85049/79-25W08

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A OD CAD SZ 25

Learn More

Datasheet

50In Stock

$88.56

$88.55

$85.29

$82.71

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

90 Deg

Circular MIL Spec Backshells Straight Shell size 16 Black Zinc Nickel w/ Exposed Nickel Entry 3

M85049/82-16ZP03
Amphenol PCD
1: $62.80
1In Stock

Mfr. Part No.
M85049/82-16ZP03

Mouser Part No
523-M85049/82-16ZP03

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 16 Black Zinc Nickel w/ Exposed Nickel Entry 3

Learn More

Datasheet

1In Stock

$62.80

$54.46

$52.37

$50.62

View

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-5015, MIL-DTL-26482 II

Straight

Circular MIL Spec Backshells 18 Backshell Env-EMI/RFI

M85049/1823N06
Amphenol PCD
1: $77.64
22In Stock

Mfr. Part No.
M85049/1823N06

Mouser Part No
523-85049/1823N06

Amphenol PCD

Circular MIL Spec Backshells 18 Backshell Env-EMI/RFI

Learn More

Datasheet

22In Stock

$77.64

$67.75

$67.07

$61.81

View

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Straight

Backshells

Types of Circular MIL Spec Connectors

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