Ring Terminals

A ring terminal is a short metal tube with flat washer type ring attached. The tube or barrel end of the crimp is a hollow tube where the stranded wire is inserted and crimped. The contact or connection end is a flat ring with a central hole which connects to a stud or bolt. Ring terminals are insulated or non-insulated.

What does it do?

An electrical crimp is a solderless electrical connection. Ring terminals are used to connect wiring to screws and studs.

Where are they used?

  • Electrical panels 

  • Terminal blocks

  • Wiring harnesses

Types of Ring Terminal

Crimp terminals are available in a wide variety of ring sizes and wire sizes. The CSA (cross sectional area) or AWG (American wire gauge) of the stranded wire is the most critical. The size of the stranded wire must be adequately matched to meet the amperage. The size of the ring is matched to the bolt or stud size, usually in a metric measurement.

Insulated Terminals

DIN 46237 colour coding is the most popular type of crimp terminal. Colour coding is used to denote a wire size:

  • Red 0.5 mm² to 1.5 mm

  • Yellow 2.5 mm² to 6 mm

  • Blue 1.5 mm² to 2.5 mm

Other colours are available.


Non-insulated terminals are bigger terminals. Non-insulated terminals connect to bigger studs and bolts. Non-insulated ring terminals have the capacity to except larger stranded wire. More specialised tooling is required for these heavy-duty terminals.

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Description Price Series Series Number Insulation Insulation Material Inner Ring Diameter Outer Ring Diameter Maximum Wire Size mm² Minimum Wire Size mm² Maximum Wire Size AWG Minimum Wire Size AWG Stud Size Colour Contact Material Contact Plating
RS Stock No. 190-3334
Mfr. Part No.3240022
Each (In a Bag of 100)
C-RCI 2.5/M3.5 - Insulated Plastic 3.7mm 6.6mm 2.5mm² 1.5mm² - - M3.5 Blue Copper -
RS Stock No. 804-6956
Mfr. Part No.3240022
C-RCI 2.5/M3.5 - Insulated Plastic 3.7mm 6.6mm 2.5mm² 1.5mm² - - M3.5 Blue Copper -
RS Stock No. 804-6953
Mfr. Part No.3240018
Each (In a Pack of 100)
C-RCI 1.5/M4 - Insulated Plastic 4.3mm 8mm 1.5mm² 0.5mm² - - M4 Red Copper -
RS Stock No. 804-6950
Mfr. Part No.3240028
C-RCI 6/M5 - Insulated Plastic 5.3mm 9.5mm 6mm² 4mm² - - M5 Yellow Copper -
RS Stock No. 803-9649
Mfr. Part No.3240125
Each (In a Pack of 25)
C-RC - Uninsulated - 10.5mm 24mm 120mm² 120mm² - - M10 Silver Copper Tin