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. 443-9165
BrandRS PRO
£4.97
Each
Units
T-Adapter RJ45 Cat5e 2 Unshielded Straight Through - - - - 170 mm - -
RS Stock No. 340-9630
BrandRS PRO
£4.18
Each
Units
Coupler RJ45 Female Cat5 - STP Straight Through 25mm 25mm 45mm - - - -
RS Stock No. 340-9624
BrandRS PRO
£6.03
Each
Units
Coupler RJ45 Female Cat5 - UTP Straight Through 17.3mm 16.3mm 28mm - - - -
RS Stock No. 340-9646
BrandRS PRO
£4.05
Each
Units
Wiring Box Punch Down Cat5e 2 UTP Straight Through 25mm 25mm 45mm - - - -
RS Stock No. 186-3048
BrandRS PRO
£3.75
Each
Units
Coupler RJ45 Cat3 - UTP Straight Through 22.02mm 16mm 37.3mm - - - -
RS Stock No. 186-3098
BrandRS PRO
£5.88
Each
Units
Adapter RJ45 - 2 - Straight Through 21mm 26mm 36mm - - - -
RS Stock No. 186-3161
BrandRS PRO
£6.13
Each
Units
Extender RJ45 Female, RJ45 Male Cat3 1 - - - - - - 2 m - -
RS Stock No. 186-3111
BrandRS PRO
£5.04
Each
Units
Modular Coupler RJ45 - 2 Shielded Straight Through 18.54mm 21mm 27.46mm - - - -
RS Stock No. 186-3032
BrandRS PRO
£3.61
Each
Units
Coupler RJ11 Cat3 - UTP Straight Through 22mm 16mm 37.3mm - - - -
RS Stock No. 340-9652
BrandRS PRO
£6.54
Each
Units
Wiring Box Punch Down Cat5 2 STP Straight Through 25mm 25mm 45mm - - - -
RS Stock No. 186-3149
BrandRS PRO
£3.63
Each
Units
Coupler RJ45 - 2 UTP Straight Through 20.55mm 14.48mm 26.96mm - - - -
RS Stock No. 186-3082
BrandRS PRO
£5.25
Each
Units
Adapter RJ11 - 2 - Straight Through 21mm 26mm 36mm - - - -
RS Stock No. 456-1896
BrandRS PRO
£3.20
Each
Units
Adapter RJ45 Female, RJ45 Male Cat5e - - - 22.1mm 47mm 191.8mm - - - -
RS Stock No. 818-700
BrandRS PRO
£2.78
Each
Units
Adapter 9 Way D-sub Female, RJ45 - 1 Unshielded - 15mm 33mm 49.5mm - - - -
RS Stock No. 186-3155
BrandRS PRO
£6.41
Each
Units
Extender RJ11 Female, RJ11 Male Cat3 1 - - - - - - 2 m - -
RS Stock No. 111-6746
BrandRS PRO
£12.31
Each
Units
Coupler RJ45 Female - 1 Shielded Straight Through - 29.1mm 38.2mm - - GTC Sealed GTC Sealed
RS Stock No. 443-9519
BrandRS PRO
£5.44
Each
Units
T-Adapter RJ45 Cat5e 2 Shielded Straight Through - - - - 170 mm - -
RS Stock No. 111-6747
BrandRS PRO
£12.54
Each
Units
90° Coupler RJ45 Female - - Shielded - 36.9mm 29.1mm 36.2mm - - GTC Sealed GTC Sealed
RS Stock No. 186-3105
BrandRS PRO
£5.12
Each
Units
Adapter RJ45 - 2 - Straight Through 21mm 26mm 36mm - - - -
RS Stock No. 818-693
BrandRS PRO
£2.78
Each
Units
Adapter 9 Way D-sub Male, RJ45 - 1 Unshielded - 15mm 33mm 49.5mm - - - -
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