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. 886-0434
Mfr. Part No.40-9538F
MYR11.108
Each (In a Pack of 10)
units
D-Sub Modular Adapter Kit DB9, RJ45 - 1 (RJ45) - Straight Through - - - - - - 40
RS Stock No. 886-0579
Mfr. Part No.40-9538M
MYR10.271
Each (In a Pack of 10)
units
D-Sub Modular Adapter Kit DB9, RJ45 - 1 (RJ45) - Straight Through - - - - - - 40
RS Stock No. 885-7696
Mfr. Part No.30-9242
MYR36.81
Each
units
Coupler RJ45 Female Cat5e 1 Shielded Straight Through 25mm 23.5mm 47mm - - - 30
RS Stock No. 885-8116
Mfr. Part No.30-1008KUL
MYR6.443
Each (In a Pack of 10)
units
Coupler - - 1 Unshielded Straight Through 22.5mm 17mm 37.5mm - - - 30
RS Stock No. 885-7668
Mfr. Part No.32-2058K
MYR6.927
Each (In a Pack of 10)
units
RJ-31X Surface Jack Adapter RJ31X Female - 1 - Straight Through - - - - - - 32
RS Stock No. 885-7680
Mfr. Part No.30-9344B
MYR30.04
Each
units
Coupler RJ45 Female Cat5e 1 Unshielded Straight Through 21.3mm 19mm 39.8mm - - - 30