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 18 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/85-18ZP02
Amphenol PCD
1: $99.58
31In Stock

Mfr. Part No.
M85049/85-18ZP02

Mouser Part No
523-M85049/85-18ZP02

Amphenol PCD

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

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Datasheet

31In Stock

$99.58

$75.53

$74.03

$71.99

View

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: $122.53
28In Stock
25Expected 28/7/2026

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

28In Stock

25Expected 28/7/2026

$122.53

$106.67

$91.10

$88.53

View

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

Circular MIL Spec Backshells Straight Shell size 10 Black Zinc Nickel w/ Exposed Nickel Entry Size 3

M85049/82-10ZP03
Amphenol PCD
1: $80.23
34In Stock

Mfr. Part No.
M85049/82-10ZP03

Mouser Part No
523-M85049/82-10ZP03

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 10 Black Zinc Nickel w/ Exposed Nickel Entry Size 3

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Datasheet

34In Stock

$80.23

$68.87

$65.08

$61.97

View

Min.: 1
Mult.: 1

Band Lock Adapters

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

Straight

Circular MIL Spec Backshells Straight Shell size 12 Black Zinc Nickel w/ Exposed Nickel Entry Size 1

M85049/85-12ZP01
Amphenol PCD
1: $87.29
40In Stock

Mfr. Part No.
M85049/85-12ZP01

Mouser Part No
523-M85049/85-12ZP01

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 12 Black Zinc Nickel w/ Exposed Nickel Entry Size 1

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Datasheet

40In Stock

$87.29

$87.24

$66.08

$66.07

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 2

M85049/85-16ZP02
Amphenol PCD
1: $95.87
38In Stock

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

38In Stock

$95.87

$70.11

$66.43

$65.77

View

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

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

Learn More

Datasheet

6In Stock

$85.57

$75.25

$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: $103.00
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

Learn More

Datasheet

16In Stock

$103.00

$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 2

M85049/82-12ZP02
Amphenol PCD
1: $92.99
15In Stock

Mfr. Part No.
M85049/82-12ZP02

Mouser Part No
523-M85049/82-12ZP02

Amphenol PCD

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

Learn More

Datasheet

15In Stock

$92.99

$69.14

$67.23

View

Min.: 1
Mult.: 1

Band Lock Adapters

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

Straight

Circular MIL Spec Backshells Straight Shell size 14 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/85-14ZP02
Amphenol PCD
1: $85.23
25In Stock

Mfr. Part No.
M85049/85-14ZP02

Mouser Part No
523-M85049/85-14ZP02

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 14 Black Zinc Nickel w/ Exposed Nickel Entry 2

Learn More

Datasheet

25In Stock

$85.23

$79.86

$64.16

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

Learn More

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 24 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/85-24ZP02
Amphenol PCD
1: $120.64
4In 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

4In Stock

$120.64

$104.53

$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: $106.60
7In Stock
25Expected 11/8/2026

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

Learn More

Datasheet

7In Stock

25Expected 11/8/2026

$106.60

$92.31

$73.21

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 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

Learn More

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 12 Black Zinc Nickel w/ Exposed Nickel Entry 2

M85049/85-12ZP02
Amphenol PCD
1: $88.89
15In 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

15In Stock

$88.89

$61.98

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: $124.72
224In Stock

Mfr. Part No.
M85049/1825Z10

Mouser Part No
523-M850491825Z10

Amphenol PCD

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

Learn More

Datasheet

224In Stock

$124.72

$121.22

$116.38

$114.99

$110.88

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

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

Learn More

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
8In Stock
25Expected 28/7/2026

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

Learn More

Datasheet

8In Stock

25Expected 28/7/2026

$82.40

$72.45

$57.84

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

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

M85049/82-08ZP03
Amphenol PCD
1: $86.79
28In Stock

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

Learn More

Datasheet

28In Stock

$86.79

$63.45

$60.65

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

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

Straight

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

M85049/82-18ZP02
Amphenol PCD
1: $90.36
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

Learn More

Datasheet

15In Stock

$90.36

$78.37

$76.59

$68.85

Quote

Min.: 1
Mult.: 1

Band Lock Adapters

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

Straight

Circular MIL Spec Backshells Straight Shell size 18 Black Zinc Nickel w/ Exposed Nickel Entry 3

M85049/82-18ZP03
Amphenol PCD
1: $101.22
32In Stock

Mfr. Part No.
M85049/82-18ZP03

Mouser Part No
523-M85049/82-18ZP03

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 18 Black Zinc Nickel w/ Exposed Nickel Entry 3

Learn More

Datasheet

32In Stock

$101.22

$101.00

$71.25

$70.95

Min.: 1
Mult.: 1

Band Lock Adapters

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

Straight

Circular MIL Spec Backshells Straight Shell size 23 Black Zinc Nickel w/ Exposed Nickel Entry 3

M85049/88-23ZP03
Amphenol PCD
1: $112.27
16In Stock

Mfr. Part No.
M85049/88-23ZP03

Mouser Part No
523-M85049/88-23ZP03

Amphenol PCD

Circular MIL Spec Backshells Straight Shell size 23 Black Zinc Nickel w/ Exposed Nickel Entry 3

Learn More

Datasheet

16In Stock

$112.27

$112.05

$78.15

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Straight

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

M85049/1923N07
Amphenol PCD
1: $100.50
43In Stock

Mfr. Part No.
M85049/1923N07

Mouser Part No
523-85049/1923N07

Amphenol PCD

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

Learn More

Datasheet

43In Stock

$100.50

$89.35

$89.07

$87.31

View

Min.: 1
Mult.: 1

Non-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: $108.38
39In 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

39In Stock

$108.38

$92.13

$86.37

$82.25

View

Min.: 1
Mult.: 1

Environmental EMI/RFI Backshells

MIL-DTL-38999 III, IV

90 Deg

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

M85049/89-15N02
Amphenol PCD
1: $85.58
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

$85.58

$74.71

$73.53

$68.72

$65.44

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

Circular MIL Spec Backshells 90 Degrees Shell size 10 Black Zinc Nickel w/ Exposed Nickel Entry 3

M85049/87-10ZP03
Amphenol PCD
1: $136.50
23In Stock

Mfr. Part No.
M85049/87-10ZP03

Mouser Part No
523-M85049/87-10ZP03

Amphenol PCD

Circular MIL Spec Backshells 90 Degrees Shell size 10 Black Zinc Nickel w/ Exposed Nickel Entry 3

Learn More

Datasheet

23In Stock

$136.50

$136.08

$92.99

Min.: 1
Mult.: 1

Band Lock Adapters

MIL-DTL-38999 III, IV

90 Deg

Backshells

Types of Circular MIL Spec Connectors

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