Key takeaways
- DIN 46235 is a dimensional reference for compression cable lugs, not a complete performance specification.
- The barrel bore, barrel length and palm hole pattern are the calls that decide fit.
- A standard dimension still needs a tolerance and a measurement method on the drawing.
- The crimp die, conductor class and plating thickness remain buyer decisions.
What DIN 46235 covers
DIN 46235 is a German standard for compression cable lugs. It sets out dimensions for lugs by nominal conductor cross-section, so that a lug made by one supplier can be compared with a lug made by another and can be matched to a conductor and a die. For a buyer, it is a useful way to describe a standard part without drawing every feature.
It is a dimensional document. It does not, by itself, prove the electrical performance of a joint, the pull-out strength or the corrosion resistance of the plating. Those come from a performance standard such as IEC 61238-1, from the supplier's type test and from the crimp procedure.
That distinction matters when a drawing says only DIN 46235 and a cross-section. The supplier can make the shape, but the buyer has not stated the conductor class, the plating thickness, the die or the test. The missing calls are the ones that decide whether the joint works.
How the size is expressed
A DIN 46235 lug is normally identified by the nominal conductor cross-section, in square millimetres, together with the stud size or the palm hole. The cross-section sets the barrel, and the stud sets the palm. A 50 mm2 lug for an M10 stud is a different part from a 50 mm2 lug for an M12 stud.
The designation does not describe the conductor class. A compression lug sized for a stranded conductor may not accept a fine strand flexible conductor without losing strands or leaving voids. If the cable is flexible, say so and check the barrel against the conductor class rather than assuming that the cross-section is enough.
The same caution applies to aluminium. DIN 46235 is not the right reference for an aluminium conductor joint. A bimetallic or aluminium lug has its own geometry and its own joint preparation, and mixing the references is a common source of a failed first article.
The callouts that decide fit
The barrel bore and the barrel length control the conductor. The bore must accept the full strand bundle, and the length must cover the strip without leaving bare conductor outside the crimp. A barrel that is correct on diameter but short on length can look acceptable and still fail a pull test.
The palm calls control the terminal interface: hole diameter, hole spacing, palm width, palm thickness and palm angle. A one-hole palm is compact. A two-hole palm holds orientation and shares the load, but only if the spacing matches the terminal. The angle changes the crimp access as well as the routing.
The marking is part of the standard too. A lug should be identifiable by size and supplier, because once it is installed the barrel is hidden and the only way to check the part is the marking or the paperwork. A drawing that omits the marking makes traceability harder than it needs to be.
A standard shape is not a standard joint
Two lugs that both meet DIN 46235 can behave differently with the same cable if the material, the plating or the die is different.
Tolerances and measurement
A standard dimension is a nominal value. The drawing still needs a tolerance, or a reference to a general tolerance such as ISO 2768, and it needs to say which dimensions are critical. The barrel bore and the palm hole are usually the critical calls because they decide whether the conductor and the stud fit.
Measure the barrel bore with a pin gauge or a calibrated internal micrometer, not with the cable. Measure the palm hole with a pin or a calliper at the hole, and check the hole spacing between centres. A calliper across the outside of the palm does not prove the hole position.
Check the barrel length and the palm thickness at the same time. The barrel length affects the crimp position, and the palm thickness affects the clamping load at the stud. A thin palm can deform under torque, which loosens the joint even when the bolt was tightened correctly.
Material and plating: the drawing has to say
DIN 46235 does not remove the need to state the base metal. Electrolytic copper is the usual choice for a compression lug, but the grade and the temper still affect conductivity and crimp behaviour. Brass is not a drop-in substitute for copper in a power lug, even when the dimensions are the same.
Plating is also a buyer call. Tin is the default for copper lugs. Silver is used where contact resistance and temperature demand it. Nickel is harder and more corrosion resistant but has higher contact resistance. The drawing should name the standard, the minimum thickness and the surfaces where the minimum applies.
If the lug is plated after forming, the plating must survive the crimp. Ask for an adhesion check and a post-crimp visual check. A coating that passes on a flat coupon can crack at the barrel bend, and the crack becomes a corrosion site.
What the standard does not decide
The standard does not choose the crimp die, the crimp height or the pull test value. Those belong to the crimp procedure and the performance standard. A supplier should be able to state the die, the crimp height range and the pull test result for the lug and conductor combination.
It does not set the inspection level or the sample size. A first article may check every dimension, while production uses a sampling plan. The buyer has to say which applies and what happens when a result is outside the limit.
It does not cover the installation torque at the stud, the washer, the joint compound or the thermal cycling of the assembly. Those are system decisions. A lug can meet its drawing and still fail in a panel if the installation is wrong.
A drawing that can be quoted and inspected
Start with the standard reference and the size. Add the conductor class, the base metal, the plating and the marking. Then add a small table of the dimensions that matter, with tolerances, rather than relying on the standard alone for the features the assembly uses.
State the crimp die or ask the supplier to nominate one, and require a sample crimp with a pull test before approval. That one requirement turns a dimensional purchase into a joint purchase.
Finally, add the inspection record to the drawing or the purchase order. The record should name the measured values, the method and the lot. A certificate that says the part meets DIN 46235 without a measured dimension is a statement, not evidence.
| Callout | What it controls | How to check |
|---|---|---|
| Nominal cross-section | Barrel family and die selection | Compare with the conductor and the die list |
| Barrel bore | Whether the full strand bundle enters | Pin gauge or internal micrometer |
| Barrel length | Strip coverage and crimp position | Depth gauge or calliper |
| Palm hole | Stud fit | Pin gauge or calliper at the hole |
| Hole spacing | Two-hole terminal fit | Between centres, not edge to edge |
| Palm width | Clearance and contact area | Calliper at the palm |
| Palm thickness | Clamping load and deformation | Micrometer at a defined point |
| Palm angle | Routing and crimp access | Angle gauge or comparator |
| Marking | Size and supplier traceability | Visual against the drawing |
| Plating | Corrosion and contact resistance | Thickness method and adhesion check |
Dimensions are nominal in the standard. Add tolerances and measurement points for the calls the assembly depends on.
Common mistakes
The first is to treat the standard as a complete specification. The second is to quote a cross-section without the conductor class. The third is to accept a catalogue drawing as the production drawing, even when the palm angle or the plating has changed.
The fourth is to check the lug before crimping and never after. A lug that measures correctly can still crack at the barrel or lose strands during the crimp. The post-crimp check is the one that reflects the joint.
The fifth is to carry a drawing revision forward when the cable changes. A new conductor class or a new stud size is a new joint, and the old approval does not cover it.
Frequently asked questions
What is DIN 46235?
It is a German dimensional standard for compression cable lugs. It sets sizes by nominal conductor cross-section and defines the lug geometry. It is not a complete performance specification, so the crimp, plating and test still need to be stated.
Does a DIN 46235 lug fit any cable of the same size?
No. The conductor class matters. A fine strand flexible cable can behave differently from a stranded cable of the same cross-section. Check the barrel against the class and the strand count, and prove the crimp with a sample.
Which dimensions should be on the drawing?
At minimum, the barrel bore, barrel length, palm hole, hole spacing, palm width, palm thickness and angle. Add tolerances and measurement points for the features the assembly uses. Marking and plating belong on the drawing too.
Is DIN 46235 used for aluminium lugs?
It is a reference for compression cable lugs, but an aluminium conductor joint needs its own geometry and preparation. Use an aluminium or bimetallic lug with the correct joint method rather than applying a copper lug dimension to an aluminium cable.
Sources and further reading
- DIN 46235, Compression cable lugs
- DIN 46234, Solderless cable lugs
- IEC 61238-1, Compression and mechanical connectors for power cables
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