Key takeaways
- DIN 46234 covers ring form solderless terminals made from copper sheet, without an insulating sleeve, for copper conductors.
- The standard sets the application, the dimensions and the marking. It does not define the crimping tool.
- The range runs from 0.5 to 240 mm squared, with stud holes from M2 to M16, and the terminal is intended for stranded conductors.
- A DIN 46234 terminal uses an indent crimp and is not interchangeable with a DIN 46235 compression lug on the designation alone.
What the standard covers
DIN 46234 is the German standard for cable lugs for solderless connections in ring form, without an insulating sleeve, for copper conductors. In plain terms, it describes a family of sheet metal terminals that are crimped onto a stranded copper conductor and bolted to a stud through a ring shaped palm.
The standard defines the application, the dimensions and the marking. It does not set out a complete connection test regime, and it does not tell you which crimping tool to use. Those are matters for the product standard, the terminal maker and the application. That split is the source of most of the confusion around the designation.
The insulated version of the same ring terminal family is covered by DIN 46237. The pin and fork forms have their own standards. If a drawing says DIN 46234, it is asking for the uninsulated ring form, not an insulated terminal with a similar shape.
Sheet metal construction and the seam
A DIN 46234 terminal is made from copper sheet, rolled into a barrel and joined along a seam. The standard requires a closed barrel, so the seam is brazed or soldered. That seam is a defining feature of the part and a focus for inspection: if it opens during crimping, the joint is compromised.
The sheet construction is different from a DIN 46235 compression lug, which is made from copper tube. The tube lug has a jointless barrel and a longer body. The sheet terminal uses less copper and is generally cheaper, but it relies on the seam and on an indent crimp to compress the conductor.
The material is normally electrolytic copper, and tin plating is the standard finish for corrosion protection. Bright finishes are also offered. The plating is thin compared with a busbar coating, so the crimp has to work with the plating in place rather than relying on a thick barrier.
The dimensions that matter
The dimensional calls on a DIN 46234 drawing follow the usual lug logic. The barrel bore has to accept the conductor, the stud hole has to clear the bolt, and the palm has to sit flat on the terminal. The standard fixes a set of these dimensions for each conductor and stud combination so that a part from one maker will fit the same application as a part from another.
The barrel bore is the dimension that decides the crimp. It is sized for a stranded conductor of the nominal cross-section, and a lug that is too large for the conductor will not crimp correctly even with the right tool. The stud hole is deliberately larger than the thread, but a lug for a larger stud sits loose on a smaller one and gives less contact area.
The palm width and the material thickness set the current path and the mechanical strength. A wider palm spreads the clamp load; a thicker sheet resists deformation under the bolt. Neither is a free variable if the part is to stay within the standard.
Tolerance matters at the barrel. A bore at the top of its range with a conductor at the bottom of its range gives a loose fit, and the crimp has to close a bigger gap. A bore at the bottom of its range with a flexible conductor can make insertion difficult and encourage strand damage. The drawing should give a bore range that matches the conductor class, not a single nominal value.
| Item | What applies | Practical note |
|---|---|---|
| Form | Ring terminal, no insulating sleeve | The insulated variant is DIN 46237 |
| Conductor range | 0.5 to 240 mm squared | Stranded, fine and superfine copper conductors |
| Stud holes | M2 to M16 | Match the hole to the bolt, not to the next size up |
| Material | Electrolytic copper | Copper sheet, with a brazed or soldered seam |
| Finish | Tin plating as standard | Bright finish is also available |
| Crimp style | Indent crimp | Not the hexagonal crimp used for DIN 46235 |
Always confirm the current edition of the standard and the maker's dimensional table for the specific size.
Conductors and the solid conductor limit
DIN 46234 terminals are intended for multi-stranded, fine stranded and superfine stranded copper conductors. They are not intended for single strand solid conductors. That is a common mistake when a buyer treats the two DIN lug families as interchangeable.
The reason is the crimp. An indent crimp works by driving a punch into the barrel and forcing the strands to flow around it. A solid conductor does not flow in the same way, and the barrel may not close around it with the required compression. A compression lug to DIN 46235, with a hexagonal crimp, is the usual choice for solid conductors.
The conductor class also matters within the stranded range. A fine stranded flexible conductor has many small wires and a larger overall diameter for the same cross-section. The barrel bore and the crimp tool have to suit that construction. A lug chosen only by the nominal cross-section may be too tight or too loose.
Crimping: indent, not hex
The standard does not prescribe the crimping tool, but the terminal geometry points to an indent crimp. The indent tool drives a shaped punch into the barrel at one or more positions and compresses the conductor into a solid mass. The result is a compact joint with the strands gathered at the centre.
A hexagonal crimp is used for tube lugs and for many compression connectors. It closes the barrel into a hexagon around the conductor. Using a hex tool on a sheet metal terminal with a seam can distort the seam and leave the joint under-compressed. The tool and the terminal have to be a matched system.
That is why the terminal maker's tool recommendation matters. The tool, the die and the number of crimps are part of the connection, even though they are outside the dimensional scope of DIN 46234. A drawing that calls the standard but leaves the tool open is only specifying half the joint.
Marking, plating and inspection
The standard requires marking that identifies the terminal and its size. In practice the marking lets an installer confirm the conductor cross-section and the stud size without measuring the part. A faint or missing mark is a traceability problem, especially on a small terminal.
Inspection should cover the dimensions that affect the joint: barrel bore, stud hole, palm flatness, seam condition and plating thickness. A visual check for seam opening, cracks at the palm bend and plating damage is quick and useful. A dimensional check on a sample confirms that the tool has not drifted.
Plating thickness is usually checked on the palm or another flat area. The inside of the barrel is harder to measure and is the area that matters for the crimp. If the drawing calls a minimum thickness, agree where it will be measured and how the sample will be prepared.
Where DIN 46234 fits and where it does not
The terminal is a good fit for control cabinets, panel wiring, rail vehicles and general equipment where a compact, low-cost ring terminal is needed on a stranded conductor. It is widely available and easy to crimp with the right indent tool.
It is not the right choice for a solid conductor, for a very large cross-section beyond the standard range, or for an application that needs the current capacity and mechanical strength of a tube compression lug. It is also not a substitute for a sealed or insulated terminal in a wet or finger-safe location.
The practical test is the drawing. If the drawing calls DIN 46234, supply a sheet metal ring terminal with a closed seam and an indent crimp. If it calls DIN 46235, supply a tube lug with a hex crimp. The two designations describe different parts, even when the conductor size and stud size are the same.
Same size, different part
A 10 mm squared terminal on an M6 stud exists in both DIN 46234 and DIN 46235. The designation, the barrel construction and the crimp method are what tell them apart.
Frequently asked questions
What is a DIN 46234 lug?
It is a ring form solderless terminal made from copper sheet, without an insulating sleeve, for stranded copper conductors. The standard covers the application, dimensions and marking, and the terminal is crimped with an indent tool.
Can DIN 46234 be used on solid conductors?
No. The standard is intended for multi-stranded, fine stranded and superfine stranded conductors. For a solid conductor, a compression lug to DIN 46235 with a hexagonal crimp is the usual choice.
What is the difference between DIN 46234 and DIN 46235?
DIN 46234 is a sheet metal terminal with a seamed barrel and an indent crimp. DIN 46235 is a compression lug made from copper tube with a jointless barrel and a hexagonal crimp. They are different parts and are not interchangeable on the designation alone.
Is there an insulated version of DIN 46234?
Yes, the insulated ring terminal family is covered by DIN 46237. If the application needs an insulated sleeve, specify the insulated standard rather than adding a sleeve to an uninsulated part.
Sources and further reading
- DIN 46234:1980, Cable lugs for solderless connections, ring form, without insulating sleeve, for copper conductors
- EN 13599, Copper and copper alloys, copper plate, sheet and strip for electrical purposes
- IEC 61238-1, Compression and mechanical connectors for power cables
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Checking a DIN lug against the drawing
Send the drawing and the conductor class. The engineering desk will confirm whether the part should be a DIN 46234 terminal or a DIN 46235 compression lug.
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