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. 186-3054
BrandRS PRO
£4.66
Each
Units
Coupler RJ45 Cat3 - UTP Crossed 22.02mm 16mm 37.3mm - - - -
RS Stock No. 186-3133
BrandRS PRO
£3.07
Each
Units
Coupler RJ11 - 2 Unshielded Straight Through 20.55mm 14.48mm 26.96mm - - - -
RS Stock No. 360-7115
BrandRS PRO
£9.36
Each
Units
Coupler RJ45 Male Cat5e - UTP Straight Through 19.6mm 23mm 32.5mm - - - -
RS Stock No. 625-6209
BrandRS PRO
£4.91
Each
Units
Adapter RJ11 - - - Straight Through 18mm 45mm 28mm - - - -
RS Stock No. 907-5656
BrandRS PRO
£7.44
Each
Units
Feedthrough Connector RJ45 Cat5e - FTP - - 26mm - - - FT -
RS Stock No. 186-3076
BrandRS PRO
£4.81
Each
Units
Adapter RJ11 - 2 - Straight Through 21mm 26mm 36mm - - - -
RS Stock No. 818-665
BrandRS PRO
£2.78
Each
Units
Adapter 9 Way D-sub Female, RJ11 - - Unshielded - 15mm 33mm 49.5mm - - - -
RS Stock No. 916-0243
BrandRS PRO
£5.55
Each
Units
Feedthrough Connector RJ45 Female Cat5e 2 UTP - - 26mm - - - FT -
RS Stock No. 314-8155
BrandRS PRO
£5.00
Each
Units
Adapter 9 Way D-sub Female, RJ45 Female - - - - 16mm 33mm 50mm - - - -
RS Stock No. 625-6192
BrandRS PRO
£5.03
Each
Units
Adapter RJ11 Socket/9 Way D Plug - - - - 45mm 28mm 18mm - - - -
RS Stock No. 382-2689
BrandRS PRO
£3.57
Each
Units
Adapter 9 Way D-Sub Plug/RJ45 Socket - - Shielded - 49.5mm 33mm 15mm - - - -
RS Stock No. 314-8111
BrandRS PRO
£4.32
Each
Units
Adapter 9 Way D-sub Female, RJ45 Female - - - - 16mm 33mm 50mm - - - -
RS Stock No. 818-659
BrandRS PRO
£3.72
Each
Units
Adapter 9 Way D-sub Male, RJ11 - - Unshielded - 15mm 33mm 49.5mm - - - -
RS Stock No. 314-8098
BrandRS PRO
£4.54
Each
Units
Adapter 9 Way D-sub Male, RJ45 Female - - - - 16mm 33mm 50mm - - - -
RS Stock No. 314-8149
BrandRS PRO
£5.08
Each
Units
Adapter 9 Way D-sub Male, RJ45 Female - - - - 16mm 33mm 50mm - - - -
RS Stock No. 625-6237
BrandRS PRO
£0.88
Each
Units
Adapter RJ45 Socket/9 Way D Plug - - - - 45mm 28mm 18mm - - - -
RS Stock No. 916-0259
BrandRS PRO
£9.28
Each
Units
Feedthrough Connector RJ45 Cat6 2 FTP - - 26mm - - - FT -
RS Stock No. 916-0255
BrandRS PRO
£7.35
Each
Units
Feedthrough Connector RJ45 Cat6 2 UTP - - 26mm - - - FT -
RS Stock No. 818-716
BrandRS PRO
£2.97
Each
Units
Adapter 25 Way D-sub Male, RJ45 - - Unshielded - 15mm 55.1mm 39mm - - - -
RS Stock No. 400-9001
BrandRS PRO
£19.51
Each
Units
T-Adapter RJ45 Cat5 2 Shielded Straight Through - - - - 150 mm - -
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