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 BACKSHELL NON ENV ST NICKEL SZ 20

M85049/2920N08A
Amphenol PCD
1: 40,20 €
29In Stock

Mfr. Part No.
M85049/2920N08A

Mouser Part No
523-85049/2920N08A

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL NON ENV ST NICKEL SZ 20

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Datasheet

29In Stock

40,20 €

36,60 €

31,11 €

30,13 €

29,45 €

Min.: 1
Mult.: 1

Non-Environmental Backshells

MIL-DTL-38999 I, II

Straight

Circular MIL Spec Backshells 31 Backshell Grommet Nut

M85049/31-10N
Amphenol PCD
1: 12,13 €
38In Stock

Mfr. Part No.
M85049/31-10N

Mouser Part No
523-85049/31-10N

Amphenol PCD

Circular MIL Spec Backshells 31 Backshell Grommet Nut

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Datasheet

38In Stock

12,13 €

11,42 €

9,69 €

9,37 €

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Min.: 1
Mult.: 1

E Nuts

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

Straight

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 12

M85049/31-12N
Amphenol PCD
1: 12,38 €
11In Stock

Mfr. Part No.
M85049/31-12N

Mouser Part No
523-85049/31-12N

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 12

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Datasheet

11In Stock

12,38 €

11,00 €

10,57 €

9,83 €

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Min.: 1
Mult.: 1

E Nuts

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

Straight

Circular MIL Spec Backshells 31 Backshell Grommet Nut

M85049/31-14N
Amphenol PCD
1: 10,02 €
78In Stock

Mfr. Part No.
M85049/31-14N

Mouser Part No
523-85049/31-14N

Amphenol PCD

Circular MIL Spec Backshells 31 Backshell Grommet Nut

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Datasheet

78In Stock

10,02 €

9,17 €

8,82 €

8,11 €

7,38 €

Min.: 1
Mult.: 1

E Nuts

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

Straight

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 16

M85049/31-16N
Amphenol PCD
1: 12,89 €
17In Stock

Mfr. Part No.
M85049/31-16N

Mouser Part No
523-85049/31-16N

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 16

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Datasheet

17In Stock

12,89 €

11,43 €

10,99 €

10,45 €

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Min.: 1
Mult.: 1

E Nuts

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

Straight

Circular MIL Spec Backshells 31 Backshell Grommet Nut

M85049/31-18N
Amphenol PCD
1: 8,37 €
17In Stock
25Expected 28/05/2026

Mfr. Part No.
M85049/31-18N

Mouser Part No
523-85049/31-18N

Amphenol PCD

Circular MIL Spec Backshells 31 Backshell Grommet Nut

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Datasheet

17In Stock

25Expected 28/05/2026

8,37 €

8,14 €

7,68 €

Min.: 1
Mult.: 1

E Nuts

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

Straight

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 20

M85049/31-20N
Amphenol PCD
1: 11,97 €
26In Stock

Mfr. Part No.
M85049/31-20N

Mouser Part No
523-85049/31-20N

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 20

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Datasheet

26In Stock

11,97 €

11,65 €

9,90 €

9,56 €

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Min.: 1
Mult.: 1

E Nuts

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

Straight

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST BLACK SZ 22

M85049/31-22A
Amphenol PCD
1: 13,36 €
4In Stock

Mfr. Part No.
M85049/31-22A

Mouser Part No
523-85049/31-22A

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST BLACK SZ 22

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Datasheet

4In Stock

13,36 €

11,58 €

10,29 €

10,20 €

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Min.: 1
Mult.: 1

E Nuts

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

Straight

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 22

M85049/31-22N
Amphenol PCD
1: 14,95 €
10In Stock

Mfr. Part No.
M85049/31-22N

Mouser Part No
523-85049/31-22N

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 22

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Datasheet

10In Stock

14,95 €

12,42 €

11,45 €

10,22 €

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Min.: 1
Mult.: 1

E Nuts

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

Straight

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 24

M85049/31-24N
Amphenol PCD
1: 13,86 €
1In Stock

Mfr. Part No.
M85049/31-24N

Mouser Part No
523-85049/31-24N

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 24

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Datasheet

1In Stock

13,86 €

12,06 €

12,05 €

11,85 €

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Min.: 1
Mult.: 1

E Nuts

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

Straight

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 32

M85049/31-32N
Amphenol PCD
1: 21,25 €
22In Stock

Mfr. Part No.
M85049/31-32N

Mouser Part No
523-85049/31-32N

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST NIC SZ 32

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Datasheet

22In Stock

21,25 €

19,30 €

19,29 €

18,00 €

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Min.: 1
Mult.: 1

E Nuts

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

Straight

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST SL NIC SZ 16

M85049/31S16N
Amphenol PCD
1: 18,52 €
23In Stock

Mfr. Part No.
M85049/31S16N

Mouser Part No
523-85049/31S16N

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL GRMT NUT ST SL NIC SZ 16

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Datasheet

23In Stock

18,52 €

15,74 €

14,52 €

14,17 €

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Min.: 1
Mult.: 1

E Nuts

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

Straight

Circular MIL Spec Backshells 36 Backshell Non Env-EMI/RFI

M85049/3614N04
Amphenol PCD
1: 52,13 €
11In Stock

Mfr. Part No.
M85049/3614N04

Mouser Part No
523-85049/3614N04

Amphenol PCD

Circular MIL Spec Backshells 36 Backshell Non Env-EMI/RFI

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Datasheet

11In Stock

52,13 €

45,21 €

43,47 €

42,02 €

View

Min.: 1
Mult.: 1

Non-Environmental EMI/RFI Backshells

MIL-DTL-38999 I, II

Straight

Circular MIL Spec Backshells 36 Backshell Non Env-EMI/RFI

M85049/3614N05
Amphenol PCD
1: 53,69 €
11In Stock

Mfr. Part No.
M85049/3614N05

Mouser Part No
523-85049/3614N05

Amphenol PCD

Circular MIL Spec Backshells 36 Backshell Non Env-EMI/RFI

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Datasheet

11In Stock

53,69 €

49,73 €

49,62 €

45,03 €

View

Min.: 1
Mult.: 1

Non-Environmental EMI/RFI Backshells

MIL-DTL-38999 I, II

Straight

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST NIC SZ 16

M85049/3616N04
Amphenol PCD
1: 61,31 €
25In Stock

Mfr. Part No.
M85049/3616N04

Mouser Part No
523-85049/3616N04

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST NIC SZ 16

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Datasheet

25In Stock

61,31 €

54,82 €

49,24 €

44,48 €

View

Min.: 1
Mult.: 1

Non-Environmental EMI/RFI Backshells

MIL-DTL-38999 I, II

Straight

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST NIC SZ 16

M85049/3616N05
Amphenol PCD
1: 54,90 €
12In Stock

Mfr. Part No.
M85049/3616N05

Mouser Part No
523-85049/3616N05

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST NIC SZ 16

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Datasheet

12In Stock

54,90 €

48,27 €

46,41 €

44,87 €

42,39 €

Min.: 1
Mult.: 1

Non-Environmental EMI/RFI Backshells

MIL-DTL-38999 I, II

Straight

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST NIC SZ 16

M85049/3616N06
Amphenol PCD
1: 64,59 €
20In Stock

Mfr. Part No.
M85049/3616N06

Mouser Part No
523-85049/3616N06

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST NIC SZ 16

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Datasheet

20In Stock

64,59 €

58,20 €

47,83 €

44,33 €

View

Min.: 1
Mult.: 1

Non-Environmental EMI/RFI Backshells

MIL-DTL-38999 I, II

Straight

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST NIC SZ 22

M85049/3622N06
Amphenol PCD
1: 60,95 €
5In Stock

Mfr. Part No.
M85049/3622N06

Mouser Part No
523-85049/3622N06

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL NON ENV EMI/RFI ST NIC SZ 22

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Datasheet

5In Stock

60,95 €

51,81 €

48,56 €

46,24 €

44,68 €

Min.: 1
Mult.: 1

Non-Environmental EMI/RFI Backshells

MIL-DTL-38999 I, II

Straight

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC

M85049/6-12N
Amphenol PCD
1: 48,81 €
12In Stock

Mfr. Part No.
M85049/6-12N

Mouser Part No
523-85049/6-12N

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC

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Datasheet

12In Stock

48,81 €

42,33 €

40,70 €

39,34 €

View

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 45 DEG NIC

M85049/6-17N
Amphenol PCD
1: 55,16 €
19In Stock

Mfr. Part No.
M85049/6-17N

Mouser Part No
523-85049/6-17N

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC

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Datasheet

19In Stock

55,16 €

48,50 €

46,64 €

45,08 €

42,59 €

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 45 DEG NIC SZ 9

M85049/78-09N02
Amphenol PCD
1: 63,40 €
5In Stock
25Expected 16/03/2026

Mfr. Part No.
M85049/78-09N02

Mouser Part No
523-85049/78-09N02

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC SZ 9

Learn More

Datasheet

5In Stock

25Expected 16/03/2026

63,40 €

51,68 €

47,75 €

43,84 €

View

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC SZ 19

M85049/78-19N03
Amphenol PCD
1: 67,74 €
3In Stock
5Expected 26/03/2026

Mfr. Part No.
M85049/78-19N03

Mouser Part No
523-85049/78-19N03

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC SZ 19

Learn More

Datasheet

3In Stock

5Expected 26/03/2026

67,74 €

58,91 €

53,52 €

50,43 €

View

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC SZ 21

M85049/78-21N06
Amphenol PCD
1: 73,46 €
16In Stock

Mfr. Part No.
M85049/78-21N06

Mouser Part No
523-85049/78-21N06

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC SZ 21

Learn More

Datasheet

16In Stock

73,46 €

66,07 €

63,54 €

61,41 €

58,02 €

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC SZ 21

M85049/78-21N07
Amphenol PCD
1: 71,96 €
5In Stock

Mfr. Part No.
M85049/78-21N07

Mouser Part No
523-85049/78-21N07

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC SZ 21

Learn More

Datasheet

5In Stock

71,96 €

63,08 €

58,71 €

56,48 €

55,60 €

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC SZ 21

M85049/78-21N08
Amphenol PCD
1: 66,50 €
11In Stock

Mfr. Part No.
M85049/78-21N08

Mouser Part No
523-85049/78-21N08

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI 45 DEG NIC SZ 21

Learn More

Datasheet

11In Stock

66,50 €

64,43 €

60,39 €

57,51 €

56,71 €

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Backshells

Types of Circular MIL Spec Connectors

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