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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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Part #

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 21

M85049/1821W07
Amphenol PCD
1: Rp1.483.274
118On Order

Mfr. Part No.
M85049/1821W07

Mouser Part No
523-85049/1821W07

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI ST OD CAD SZ 21

Datasheet

118On Order

Rp1.483.274

Rp1.261.288

Rp1.182.216

Rp1.125.894

Rp1.072.140

Min.: 1
Mult.: 1

No

Circular MIL Spec Backshells 18 Backshell Env-EMI/RFI

M85049/1823W03
Amphenol PCD
1: Rp1.471.533
47On Order

Mfr. Part No.
M85049/1823W03

Mouser Part No
523-85049/1823W03

Circular MIL Spec Backshells 18 Backshell Env-EMI/RFI

Datasheet

47On Order

Rp1.471.533

Rp1.251.748

Rp1.173.227

Rp1.117.271

Rp1.064.068

Min.: 1
Mult.: 1

No

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

M85049/1823W04
Amphenol PCD
1: Rp1.459.791
22Expected 09/03/2026

Mfr. Part No.
M85049/1823W04

Mouser Part No
523-85049/1823W04

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

Datasheet

22Expected 09/03/2026

Rp1.459.791

Rp1.274.680

Rp1.194.875

Rp1.137.819

Rp1.083.515

Min.: 1
Mult.: 1

No

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

M85049/1823W05
Amphenol PCD
1: Rp1.408.973
100On Order

Mfr. Part No.
M85049/1823W05

Mouser Part No
523-85049/1823W05

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

Datasheet

100On Order

Rp1.408.973

Rp1.408.789

Rp1.333.387

View

Min.: 1
Mult.: 1

No

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

M85049/1823W08
Amphenol PCD
1: Rp1.834.417
50Expected 09/03/2026

Mfr. Part No.
M85049/1823W08

Mouser Part No
523-85049/1823W08

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

Datasheet

50Expected 09/03/2026

Rp1.834.417

Rp1.656.827

Rp1.540.147

Rp1.369.529

View

Min.: 1
Mult.: 1

No

Circular MIL Spec Backshells 18 Backshell Env-EMI/RFI

M85049/1825W06
Amphenol PCD
1: Rp1.637.564
143On Order

Mfr. Part No.
M85049/1825W06

Mouser Part No
523-85049/1825W06

Circular MIL Spec Backshells 18 Backshell Env-EMI/RFI

Datasheet

143On Order

Rp1.637.564

Rp1.570.785

Rp1.426.952

Rp1.300.915

Rp1.235.787

Min.: 1
Mult.: 1

No

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

M85049/1825W08
Amphenol PCD
1: Rp1.960.270
50On Order

Mfr. Part No.
M85049/1825W08

Mouser Part No
523-85049/1825W08

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

Datasheet

50On Order

Rp1.960.270

Rp1.802.495

Rp1.436.492

Rp1.380.720

View

Min.: 1
Mult.: 1

No

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

M85049/1825W10
Amphenol PCD
1: Rp1.764.518
73Expected 25/05/2026

Mfr. Part No.
M85049/1825W10

Mouser Part No
523-85049/1825W10

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

Datasheet

73Expected 25/05/2026

Rp1.764.518

Rp1.632.977

Rp1.426.402

Rp1.410.074

View

Min.: 1
Mult.: 1

No

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

M85049/1925W06
Amphenol PCD
1: Rp1.717.736
32On Order

Mfr. Part No.
M85049/1925W06

Mouser Part No
523-85049/1925W06

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

Datasheet

32On Order

Rp1.717.736

Rp1.569.684

Rp1.326.599

Rp1.245.510

View

Min.: 1
Mult.: 1

No

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

M85049/1925W08
Amphenol PCD
1: Rp1.604.541
25Expected 28/05/2026

Mfr. Part No.
M85049/1925W08

Mouser Part No
523-85049/1925W08

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

Datasheet

25Expected 28/05/2026

Rp1.604.541

Rp1.474.468

Rp1.349.165

Rp1.304.034

View

Min.: 1
Mult.: 1

No

Circular MIL Spec Backshells BACKSHELL CRIMP RING ADPTR ST CAD SZ 17

M85049/20-17W
Amphenol PCD
1: Rp455.898
75Expected 29/05/2026

Mfr. Part No.
M85049/20-17W

Mouser Part No
523-85049/20-17W

Circular MIL Spec Backshells BACKSHELL CRIMP RING ADPTR ST CAD SZ 17

Datasheet

75Expected 29/05/2026

Rp455.898

Rp427.278

Rp427.095

Rp367.103

View

Min.: 1
Mult.: 1

No

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

M85049/25-118W
Amphenol PCD
1: Rp1.459.057
25Expected 26/03/2026

Mfr. Part No.
M85049/25-118W

Mouser Part No
523-85049/25-118W

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

Datasheet

25Expected 26/03/2026

Rp1.459.057

Rp1.186.986

Rp1.032.696

Min.: 1
Mult.: 1

No

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

M85049/6-26W
Amphenol PCD
1: Rp2.675.397
21Expected 13/05/2026

Mfr. Part No.
M85049/6-26W

Mouser Part No
523-85049/6-26W

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

Datasheet

21Expected 13/05/2026

Rp2.675.397

Rp2.504.963

Rp2.145.198

Min.: 1
Mult.: 1

No

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

M85049/6-60W
Amphenol PCD
1: Rp1.566.748
24Expected 23/03/2026

Mfr. Part No.
M85049/6-60W

Mouser Part No
523-85049/6-60W

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

Datasheet

24Expected 23/03/2026

Rp1.566.748

Rp1.566.565

Rp1.478.504

View

Min.: 1
Mult.: 1

No

Circular MIL Spec Backshells BACKSHELL EMI/RFI 45 DEG OD CAD SZ 09

M85049/78-13W03
Amphenol PCD
1: Rp1.464.745
22Expected 04/03/2026

Mfr. Part No.
M85049/78-13W03

Mouser Part No
523-85049/78-13W03

Circular MIL Spec Backshells BACKSHELL EMI/RFI 45 DEG OD CAD SZ 09

Datasheet

22Expected 04/03/2026

Rp1.464.745

Rp1.385.857

Rp1.385.673

Rp1.371.730

View

Min.: 1
Mult.: 1

No

Circular MIL Spec Backshells BACKSHELL EMI/RFI 45 DEG OD CAD SZ 09

M85049/78-17W04
Amphenol PCD
1: Rp1.590.415
25Expected 28/05/2026

Mfr. Part No.
M85049/78-17W04

Mouser Part No
523-85049/78-17W04

Circular MIL Spec Backshells BACKSHELL EMI/RFI 45 DEG OD CAD SZ 09

Datasheet

25Expected 28/05/2026

Rp1.590.415

Rp1.461.259

Rp1.461.075

Rp1.449.701

View

Min.: 1
Mult.: 1

No

Circular MIL Spec Backshells BACKSHELL EMI/RFI 45 DEG OD CAD SZ 09

M85049/78-25W10
Amphenol PCD
1: Rp2.167.580
25Expected 16/03/2026

Mfr. Part No.
M85049/78-25W10

Mouser Part No
523-85049/78-25W10

Circular MIL Spec Backshells BACKSHELL EMI/RFI 45 DEG OD CAD SZ 09

Datasheet

25Expected 16/03/2026

Rp2.167.580

Rp2.012.373

Rp1.742.320

Rp1.707.462

View

Min.: 1
Mult.: 1

No

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

M85049/79-17W02
Amphenol PCD
1: Rp1.588.397
46Expected 11/05/2026

Mfr. Part No.
M85049/79-17W02

Mouser Part No
523-85049/79-17W02

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

Datasheet

46Expected 11/05/2026

Rp1.588.397

Rp1.359.255

Rp1.274.130

Rp1.213.404

Rp1.155.431

Min.: 1
Mult.: 1

No

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

M85049/79-17W03
Amphenol PCD
1: Rp1.872.393
50Expected 02/03/2026

Mfr. Part No.
M85049/79-17W03

Mouser Part No
523-85049/79-17W03

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

Datasheet

50Expected 02/03/2026

Rp1.872.393

Rp1.690.767

Rp1.538.129

Rp1.396.131

View

Min.: 1
Mult.: 1

No

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A OD CAD SZ 23

M85049/79-23W03
Amphenol PCD
1: Rp1.812.401
25Expected 23/03/2026

Mfr. Part No.
M85049/79-23W03

Mouser Part No
523-85049/79-23W03

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A OD CAD SZ 23

Datasheet

25Expected 23/03/2026

Rp1.812.401

Rp1.652.608

Rp1.589.131

Rp1.536.111

Rp1.451.169

Min.: 1
Mult.: 1

No

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A OD CAD SZ 23

M85049/79-23W04
Amphenol PCD
1: Rp1.881.015
21On Order

Mfr. Part No.
M85049/79-23W04

Mouser Part No
523-85049/79-23W04

Circular MIL Spec Backshells BACKSHELL ENV EMI/ RFI R/A OD CAD SZ 23

Datasheet

21On Order

Rp1.881.015

Rp1.748.741

Rp1.690.034

Rp1.561.428

View

Min.: 1
Mult.: 1

No

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

M85049/8-40W
Amphenol PCD
1: Rp1.299.080
112On Order

Mfr. Part No.
M85049/8-40W

Mouser Part No
523-85049/8-40W

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

Datasheet

112On Order

Rp1.299.080

Rp1.162.769

Rp1.024.257

Rp962.615

View

Min.: 1
Mult.: 1

No

Circular MIL Spec Backshells BACKSHELL BND LOCK ADPTR ST CAD SZ 14

M85049/82-14W03
Amphenol PCD
1: Rp814.379
216Expected 11/03/2026

Mfr. Part No.
M85049/82-14W03

Mouser Part No
523-85049/82-14W03

Circular MIL Spec Backshells BACKSHELL BND LOCK ADPTR ST CAD SZ 14

Datasheet

216Expected 11/03/2026

Rp814.379

Rp787.043

Rp786.860

Rp720.631

View

Min.: 1
Mult.: 1

No

Circular MIL Spec Backshells BACKSHELL BND LOCK ADPTR ST CAD SZ 16

M85049/82-16W02
Amphenol PCD
1: Rp1.101.494
175On Order

Mfr. Part No.
M85049/82-16W02

Mouser Part No
523-85049/82-16W02

Circular MIL Spec Backshells BACKSHELL BND LOCK ADPTR ST CAD SZ 16

Datasheet

175On Order

Rp1.101.494

Rp980.410

Rp805.756

Rp760.625

View

Min.: 1
Mult.: 1

No

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

M85049/82-20W03
Amphenol PCD
1: Rp1.149.927
100Expected 04/03/2026

Mfr. Part No.
M85049/82-20W03

Mouser Part No
523-85049/82-20W03

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

Datasheet

100Expected 04/03/2026

Rp1.149.927

Rp964.082

Rp882.076

Rp828.322

View

Min.: 1
Mult.: 1

No