RJ Adapters, Couplers & Extensions

RJ (registered jack) adapters are devices used to convert registered jack connections from one type to another. RJ25 connectors are a standardised connection used in telecommunications applications.

What are RJ adapters used for?

RJ adapters can cover a range of purposes, depending on what type of adapter they are.

  • Couplers join two different connectors together, using two input ports
  • Extensions increase the range of transmission by adding to the length of cable
  • Adapters proper allow different connections to be joined, such as an M12 cable joining to an RJ45 connection

Types of RJ adapters

RJ adapters mainly differ in how many ports they have. They may have between one and six ports, allowing them to connect up to six cables. They can also differ in their wiring configuration, and indeed there are many different types of adapters, from feedthrough connectors to junction boxes to couplers, depending on what you need to convert between. They can be shielded or unshielded.


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Description Price Type Interface Type LAN Category Number of Ports Shield Type Wiring Configuration Length Width Depth Diameter Extension Length Series Series Number
RS Stock No. 765-9031
Mfr. Part No.09455451560
BrandHARTING
£14.63
Each
Units
Coupler RJ45 Socket/RJ45 Socket Cat6 - Shielded - 13.25mm 15.7mm 34.5mm - - - -
RS Stock No. 909-3714
Mfr. Part No.NE8FDP-B
BrandNeutrik
£10.90
Each
Units
Adapter RJ45 Female Cat5e 2 Unshielded - 31mm 26mm 34.55mm 24 mm - EtherCon -
RS Stock No. 765-9084
Mfr. Part No.09454521504
BrandHARTING
£33.81
Each
Units
Coupler RJ45 Plug/RJ45 Socket Cat6 1 Shielded Straight Through 500mm - - 27.9mm - - -
RS Stock No. 875-5641
Mfr. Part No.20821010010
BrandHARTING
£15.07
Each
Units
Plug RJ45 - 1 - Crossed 14.4mm 18.6mm 47.35mm - - Ha-VIS preLink 2082101
RS Stock No. 821-2920
Mfr. Part No.MH3101S-8821
£4.12
Each
Units
Coupler RJ45 - 1 STP - 18.54mm 16.13mm 27.46mm - - MH3101 MH3101S-8821
RS Stock No. 885-7696
Mfr. Part No.30-9242
£8.26
Each
Units
Coupler RJ45 Female Cat5e 1 Shielded Straight Through 25mm 23.5mm 47mm - - - 30
RS Stock No. 768-4416
Mfr. Part No.EHRJ45P5ERS
£8.16
Each
Units
Adapter RJ45 Cat5e - - - 26mm 31mm 30mm - - - -
RS Stock No. 364-4316
Mfr. Part No.SPE190688
£22.53
Each
Units
Splitter RJ45 - 4 - - 26mm 55mm 62mm - - - -
RS Stock No. 821-2939
Mfr. Part No.MH3101S-CAT6A
£8.78
Each
Units
Coupler RJ45 Cat6a 1 STP - 16.8mm 16.1mm 30mm - - MH3101 MH3101S-CAT6A
RS Stock No. 648-6674
Mfr. Part No.1689064
£7.67
Each
Units
Modular Coupler RJ45 Cat5e 1 Shielded - 21.6mm - 34.5mm - - VS-08-BU-RJ45/BU -
RS Stock No. 875-5610
Mfr. Part No.20821010220
BrandHARTING
£36.67
Each
Units
Junction Box RJ45 Cat6EA 2 - Crossed 60mm 81mm 70mm - - Ha-VIS preLink 2082101
RS Stock No. 208-1770
Mfr. Part No.1 42-111-1A
BrandMolex
£6.56
Each
Units
Line Adaptor Unit BT Socket/RJ45 Plug - - - - - - - - 150 mm - -
RS Stock No. 364-4322
Mfr. Part No.SPE190689
£18.77
Each
Units
Splitter RJ45 - 4 - - 26mm 55mm 62mm - - - -
RS Stock No. 885-8116
Mfr. Part No.30-1008KUL
£1.48
Each (In a Pack of 10)
Units
Coupler - - 1 Unshielded Straight Through 22.5mm 17mm 37.5mm - - - 30
RS Stock No. 333-6649
Mfr. Part No.DBFB8812
£17.94
Each
Units
Splitter RJ45 Female, RJ45 Male Cat5e 2 Shielded - - - - - 250 mm - -
RS Stock No. 124-2520
Mfr. Part No.CLB-JL45
£6.31
Each
Units
Adapter RJ45, Terminal Block - 8 - Straight Through - - - - - - -
RS Stock No. 208-1792
Mfr. Part No.1 42-114
BrandMolex
£5.27
Each
Units
Extender RJ45 - - - - - - - - 150 mm - -
RS Stock No. 208-1742
Mfr. Part No.A 42-A0020
£10.65
Each
Units
Adapter RJ45 Female, RJ45 Male Cat5 - - - - - - - - - -
RS Stock No. 875-5654
Mfr. Part No.20821010001
BrandHARTING
£25.89
Each
Units
Extender RJ45 - 1 - Crossed 15.6mm 13.15mm 65.7mm - - 2082 2082101
RS Stock No. 333-6611
Mfr. Part No.DPM8812
£21.60
Each
Units
Splitter RJ45 Female, RJ45 Male Cat5e 3 - - 14mm 37mm 48mm - - - -
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