Circular MIL Spec Connectors – Mouser Singapore

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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 Straight Shell size 16 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/82-16ZP02
Amphenol PCD
1: $99.54
13In Stock

Mfr. Part No.
M85049/82-16ZP02

Mouser Part No
523-M85049/82-16ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 16 Black Zinc Nickel w/ Exposed Nickel Entry 2

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Datasheet

13In Stock

$99.54

$68.75

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

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

Straight

Circular MIL Spec Backshells Straight Shell size 24 Black Zinc Nickel w/ Exposed Nickel Entry 1

M85049/85-24ZP01
Amphenol PCD
1: $120.62
15In Stock

Mfr. Part No.
M85049/85-24ZP01

Mouser Part No
523-M85049/85-24ZP01

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 24 Black Zinc Nickel w/ Exposed Nickel Entry 1

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Datasheet

15In Stock

$120.62

$81.97

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells Straight Shell size 18 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/82-18ZP02
Amphenol PCD
1: $103.01
15In Stock

Mfr. Part No.
M85049/82-18ZP02

Mouser Part No
523-M85049/82-18ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 18 Black Zinc Nickel w/ Exposed Nickel Entry 2

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Datasheet

15In Stock

$103.01

$70.95

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

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

Straight

Circular MIL Spec Backshells Straight Shell size 10 Black Zinc Nickel w/ Exposed Nickel Entry Size 2

M85049/85-10ZP02
Amphenol PCD
1: $85.57
6In Stock

Mfr. Part No.
M85049/85-10ZP02

Mouser Part No
523-M85049/85-10ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 10 Black Zinc Nickel w/ Exposed Nickel Entry Size 2

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Datasheet

6In Stock

$85.57

$75.74

$59.87

$59.69

View

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells Straight Shell size 19 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/88-19ZP02
Amphenol PCD
1: $103.01
16In Stock

Mfr. Part No.
M85049/88-19ZP02

Mouser Part No
523-M85049/88-19ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 19 Black Zinc Nickel w/ Exposed Nickel Entry 2

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Datasheet

16In Stock

$103.01

$70.95

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells Straight Shell size 12 Black Zinc Nickel w/ Exposed Nickel Entry Size 3

M85049/82-12ZP03
Amphenol PCD
1: $92.99
9In Stock

Mfr. Part No.
M85049/82-12ZP03

Mouser Part No
523-M85049/82-12ZP03

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 12 Black Zinc Nickel w/ Exposed Nickel Entry Size 3

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Datasheet

9In Stock

$92.99

$80.95

$64.61

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

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

Straight

Circular MIL Spec Backshells Straight Shell size 8 Black Zinc Nickel w/ Exposed Nickel Entry Size 2

M85049/85-08ZP02
Amphenol PCD
1: $82.40
9In Stock
25Expected 15/7/2026

Mfr. Part No.
M85049/85-08ZP02

Mouser Part No
523-M85049/85-08ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 8 Black Zinc Nickel w/ Exposed Nickel Entry Size 2

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Datasheet

9In Stock

25Expected 15/7/2026

$82.40

$72.93

$57.84

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells Straight Shell size 24 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/85-24ZP02
Amphenol PCD
1: $120.62
18In Stock

Mfr. Part No.
M85049/85-24ZP02

Mouser Part No
523-M85049/85-24ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 24 Black Zinc Nickel w/ Exposed Nickel Entry 2

Learn More

Datasheet

18In Stock

$120.62

$81.97

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells Straight Shell size 21 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/88-21ZP02
Amphenol PCD
1: $106.61
17In Stock

Mfr. Part No.
M85049/88-21ZP02

Mouser Part No
523-M85049/88-21ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 21 Black Zinc Nickel w/ Exposed Nickel Entry 2

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Datasheet

17In Stock

$106.61

$73.21

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells Straight Shell size 12 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/85-12ZP02
Amphenol PCD
1: $88.88
17In Stock

Mfr. Part No.
M85049/85-12ZP02

Mouser Part No
523-M85049/85-12ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 12 Black Zinc Nickel w/ Exposed Nickel Entry 2

Learn More

Datasheet

17In Stock

$88.88

$61.98

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells Straight Shell size 16 Black Zinc Nickel w/ Exposed Nickel Entry 1

M85049/85-16ZP01
Amphenol PCD
1: $95.87
15In Stock

Mfr. Part No.
M85049/85-16ZP01

Mouser Part No
523-M85049/85-16ZP01

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 16 Black Zinc Nickel w/ Exposed Nickel Entry 1

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Datasheet

15In Stock

$95.87

$66.43

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells Straight Shell size 25 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/88-25ZP02
Amphenol PCD
1: $122.51
3In Stock
50On Order

Mfr. Part No.
M85049/88-25ZP02

Mouser Part No
523-M85049/88-25ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 25 Black Zinc Nickel w/ Exposed Nickel Entry 2

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Datasheet

3In Stock

50On Order

$122.51

$106.67

$83.14

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells Straight Shell size 16 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/85-16ZP02
Amphenol PCD
1: $95.87
13In Stock
25Expected 28/5/2026

Mfr. Part No.
M85049/85-16ZP02

Mouser Part No
523-M85049/85-16ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 16 Black Zinc Nickel w/ Exposed Nickel Entry 2

Learn More

Datasheet

13In Stock

25Expected 28/5/2026

$95.87

$66.43

$65.98

$65.61

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells Straight Shell size 20 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/85-20ZP02
Amphenol PCD
1: $103.43
8In Stock

Mfr. Part No.
M85049/85-20ZP02

Mouser Part No
523-M85049/85-20ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 20 Black Zinc Nickel w/ Exposed Nickel Entry 2

Learn More

Datasheet

8In Stock

$103.43

$90.04

$71.20

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

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

M85049/1825Z10
Amphenol PCD
1: $133.16
224In Stock

Mfr. Part No.
M85049/1825Z10

Mouser Part No
523-M850491825Z10

Amphenol PCD

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

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Datasheet

224In Stock

$133.16

$128.30

$122.21

$120.82

$118.90

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST NIC SZ 25

M85049/1825N06
Amphenol PCD
1: $85.00
45In Stock

Mfr. Part No.
M85049/1825N06

Mouser Part No
523-85049/1825N06

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST NIC SZ 25

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Datasheet

45In Stock

$85.00

$84.94

$84.93

$84.07

View

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells 84 Backshell Band Lock

M85049/84-24N03
Amphenol PCD
1: $127.34
20In Stock

Mfr. Part No.
M85049/84-24N03

Mouser Part No
523-85049/84-24N03

Amphenol PCD

Circular MIL Spec Backshells 84 Backshell Band Lock

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Datasheet

20In Stock

$127.34

$121.86

$121.85

$106.65

View

Min.: 1
Mult.: 1

Band Lock Adapters

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

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

M85049/78-09N02
Amphenol PCD
1: $93.83
29In Stock

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

29In Stock

$93.83

$90.34

$77.30

$75.69

View

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A NIC SZ 21

M85049/79-21N06
Amphenol PCD
1: $108.41
29In Stock

Mfr. Part No.
M85049/79-21N06

Mouser Part No
523-85049/79-21N06

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A NIC SZ 21

Learn More

Datasheet

29In Stock

$108.41

$99.91

$96.67

$94.42

$89.93

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

90 Deg

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST NIC SZ 23

M85049/1823N04
Amphenol PCD
1: $110.84
31In Stock

Mfr. Part No.
M85049/1823N04

Mouser Part No
523-85049/1823N04

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST NIC SZ 23

Learn More

Datasheet

31In Stock

$110.84

$104.21

$88.45

$82.91

Quote

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A NIC SZ 11

M85049/79-11N02
Amphenol PCD
1: $94.10
42In Stock

Mfr. Part No.
M85049/79-11N02

Mouser Part No
523-85049/79-11N02

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A NIC SZ 11

Learn More

Datasheet

42In Stock

$94.10

$90.93

$83.62

$78.88

View

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 NIC SZ 19

M85049/79-19N03
Amphenol PCD
1: $104.19
23In Stock

Mfr. Part No.
M85049/79-19N03

Mouser Part No
523-85049/79-19N03

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A NIC SZ 19

Learn More

Datasheet

23In Stock

$104.19

$101.00

$97.06

$96.12

View

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

90 Deg

Circular MIL Spec Backshells BACKSHELL BND LOCK ADPTR ST NIC SZ 20

M85049/82-20N03
Amphenol PCD
1: $63.76
53In Stock

Mfr. Part No.
M85049/82-20N03

Mouser Part No
523-85049/82-20N03

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL BND LOCK ADPTR ST NIC SZ 20

Learn More

Datasheet

53In Stock

$63.76

$53.60

$53.58

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

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

Circular MIL Spec Backshells BACKSHELL BND LCK 45 DEG ADPT NIC SZ 15

M85049/89-15N02
Amphenol PCD
1: $84.41
35In Stock

Mfr. Part No.
M85049/89-15N02

Mouser Part No
523-85049/89-15N02

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL BND LCK 45 DEG ADPT NIC SZ 15

Learn More

Datasheet

35In Stock

$84.41

$79.87

$67.80

$62.08

View

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST NIC SZ 25

M85049/1825N10
Amphenol PCD
1: $121.92
26In Stock

Mfr. Part No.
M85049/1825N10

Mouser Part No
523-85049/1825N10

Amphenol PCD

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST NIC SZ 25

Learn More

Datasheet

26In Stock

$121.92

$112.34

$96.33

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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