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. 768-4422
Mfr. Part No.EHRJ45P6S
$19.42
Each
units
Adapter RJ45 Cat6 - - - 26mm 31mm 30mm - - - -
RS Stock No. 619-5491
Mfr. Part No.PX0839/IDC
BrandBulgin
$61.66
Each
units
Coupler RJ45 Cat5e 1 Shielded - 37.7mm 42mm 45mm - - Buccaneer -
RS Stock No. 765-9088
Mfr. Part No.09454521510
BrandHARTING
$65.23
Each
units
Coupler RJ45 Plug/RJ45 Socket Cat6 - - Straight Through 1.5m - - - - - -
RS Stock No. 768-4416
Mfr. Part No.EHRJ45P5ERS
$14.13
Each
units
Adapter RJ45 Cat5e - - - 26mm 31mm 30mm - - - -
RS Stock No. 885-7696
Mfr. Part No.30-9242
$17.24
Each
units
Coupler RJ45 Female Cat5e 1 Shielded Straight Through 25mm 23.5mm 47mm - - - 30
RS Stock No. 364-4316
Mfr. Part No.SPE190688
$46.58
Each
units
Splitter RJ45 - 4 - - 26mm 55mm 62mm - - - -
RS Stock No. 768-5532
Mfr. Part No.IE-BSS-V14M-RJ45-C -1012310000
BrandWeidmuller
$39.50
Each
units
Coupler RJ45 Cat6a - - - - - - - - - -
RS Stock No. 848-5440
Mfr. Part No.NKBNCMBLY
BrandPanduit
$9.07
Each
units
BNC Coupler Module - - - - Straight Through 32.5mm 16.3mm 21.8mm - - NKBNCM -
RS Stock No. 768-4434
Mfr. Part No.EHFW800X2RS
$42.22
Each
units
Coupler FW800 Connector/FW800 Connector - - UTP Crossed 26mm 31mm 45mm - - - -
RS Stock No. 333-6633
Mfr. Part No.DBF8812
$30.08
Each
units
Splitter RJ45 Female, RJ45 Male Cat5e 3 - - - - - - - - -
RS Stock No. 782-0797
Mfr. Part No.555050-1
BrandCOMMSCOPE
$13.54
Each
units
Coupler - Cat3 - UTP - 30.73mm 14.6mm 19.05mm - - - -
RS Stock No. 821-2920
Mfr. Part No.MH3101S-8821
$8.54
Each
units
Coupler RJ45 - 1 STP - 18.54mm 16.13mm 27.46mm - - MH3101 MH3101S-8821
RS Stock No. 208-1742
Mfr. Part No.A 42-A0020
$29.83
Each
units
Adapter RJ45 Female, RJ45 Male Cat5 - - - - - - - - - -
RS Stock No. 821-2927
Mfr. Part No.MH3101S-CAT5E
$10.82
Each
units
Coupler RJ45 Cat5e 1 STP - 18.54mm 16.13mm 27.46mm - - MH3101 MH3101S-CAT5E
RS Stock No. 875-5641
Mfr. Part No.20821010010
BrandHARTING
$28.71
Each
units
Plug RJ45 - 1 - Crossed 14.4mm 18.6mm 47.35mm - - Ha-VIS preLink 2082101
RS Stock No. 208-1792
Mfr. Part No.1 42-114
BrandMolex
$14.23
Each
units
Extender RJ45 - - - - - - - - 150 mm - -
RS Stock No. 768-4425
Mfr. Part No.EHRJ45P5ES
$17.37
Each
units
Adapter RJ45 Cat5e - - - 26mm 31mm 30mm - - - -
RS Stock No. 782-5865
Mfr. Part No.2111122-1
BrandCOMMSCOPE
$20.27
Each
units
RJ45 Coupler - Cat5e 2 Shielded Straight Through 29.95mm 14.48mm 20.62mm - - - -
RS Stock No. 821-2911
Mfr. Part No.MH3101-8821
$3.07
Each
units
Coupler RJ45 - 1 UTP - 18.54mm 16.13mm 26.96mm - - MH3101 MH3101-8821
RS Stock No. 782-5862
Mfr. Part No.2111121-1
BrandCOMMSCOPE
$21.17
Each
units
RJ45 Coupler - Cat5e 2 Unshielded Straight Through 29.95mm 14.48mm 20.62mm - - - -
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