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 Voltage Rating
RS Stock No. 619-5479
Mfr. Part No.PX0839/PC
BrandBulgin
$27.96
Each
units
Coupler RJ45 Cat5e 1 - - - - 45mm 35.7mm - Buccaneer - -
RS Stock No. 821-2927
Mfr. Part No.MH3101S-CAT5E
$11.90
Each
units
Coupler RJ45 Cat5e 1 STP - 18.54mm 16.13mm 27.46mm - - MH3101 MH3101S-CAT5E -
RS Stock No. 186-3149
BrandRS PRO
$9.40
Each
units
Coupler RJ45 - 2 UTP Straight Through 20.55mm 14.48mm 26.96mm - - - - -
RS Stock No. 340-9630
BrandRS PRO
$12.36
Each
units
Coupler RJ45 Female Cat5 - STP Straight Through 25mm 25mm 45mm - - - - -
RS Stock No. 909-3714
Mfr. Part No.NE8FDP-B
BrandNeutrik
$28.46
Each
units
Adapter RJ45 Female Cat5e 2 Unshielded - 31mm 26mm 34.55mm 24 mm - EtherCon - -
RS Stock No. 821-2923
Mfr. Part No.MH3101-CAT5E
$6.35
Each
units
Coupler RJ45 Cat5e 1 UTP - 18.54mm 16.13mm 26.96mm - - MH3101 MH3101-CAT5E -
RS Stock No. 821-2920
Mfr. Part No.MH3101S-8821
$9.39
Each
units
Coupler RJ45 - 1 STP - 18.54mm 16.13mm 27.46mm - - MH3101 MH3101S-8821 -
RS Stock No. 360-7115
BrandRS PRO
$21.51
Each
units
Coupler RJ45 Male Cat5e - UTP Straight Through 19.6mm 23mm 32.5mm - - - - -
RS Stock No. 340-9624
BrandRS PRO
$15.37
Each
units
Coupler RJ45 Female Cat5 - UTP Straight Through 17.3mm 16.3mm 28mm - - - - -
RS Stock No. 741-7326
Mfr. Part No.IE-FCM-RJ45-C -1018790000
BrandWeidmuller
$60.35
Each
units
Coupler RJ45 Cat6a 2 STP - - - 34.7mm 30mm - - - -
RS Stock No. 619-5491
Mfr. Part No.PX0839/IDC
BrandBulgin
$67.83
Each
units
Coupler RJ45 Cat5e 1 Shielded - 37.7mm 42mm 45mm - - Buccaneer - -
RS Stock No. 782-5862
Mfr. Part No.2111121-1
BrandCOMMSCOPE
$23.50
Each
units
RJ45 Coupler - Cat5e 2 Unshielded Straight Through 29.95mm 14.48mm 20.62mm - - - - -
RS Stock No. 186-3082
BrandRS PRO
$11.96
Each
units
Adapter RJ11 - 2 - Straight Through 21mm 26mm 36mm - - - - -
RS Stock No. 186-3111
BrandRS PRO
$24.03
Each
units
Modular Coupler RJ45 - 2 Shielded Straight Through 18.54mm 21mm 27.46mm - - - - -
RS Stock No. 885-8116
Mfr. Part No.30-1008KUL
$3.345
Each (In a Pack of 10)
units
Coupler - - 1 Unshielded Straight Through 22.5mm 17mm 37.5mm - - - 30 -
RS Stock No. 821-2911
Mfr. Part No.MH3101-8821
$3.37
Each
units
Coupler RJ45 - 1 UTP - 18.54mm 16.13mm 26.96mm - - MH3101 MH3101-8821 -
RS Stock No. 111-6746
BrandRS PRO
$30.04
Each
units
Coupler RJ45 Female - 1 Shielded Straight Through - 29.1mm 38.2mm - - GTC Sealed GTC Sealed -
RS Stock No. 208-1786
Mfr. Part No.1 42-111-2A
BrandMolex
$17.88
Each
units
Extender RJ45 - - - - - - - - 150 mm - - -
RS Stock No. 818-693
BrandRS PRO
$9.78
Each
units
Adapter RJ45, 9 Way D-sub Male - 1 Unshielded - 15mm 33mm 49.5mm - - - - -
RS Stock No. 821-2939
Mfr. Part No.MH3101S-CAT6A
$26.46
Each
units
Coupler RJ45 Cat6a 1 STP - 16.8mm 16.1mm 30mm - - MH3101 MH3101S-CAT6A -