CUPAL part number cross-reference: which size matches your code?

This page maps the designations that turn up on drawings, BOM lines and old purchase orders — 880111, ICALCU10CS, Cupal M 10 Al-Cu, VCUP2, 1053 — onto the CUPAL sizes we hold, with the bore, the outer diameter and our SKU on the same row. Net list prices sit on the product pages, one link away.

Washer part numbers — which CUPAL washer they match

The four-digit 880109 / 880110 / 880111 / 880112 family, the Cupal M 6/8/10/12 Al-Cu designations and the ICALCU10CS-style codes all describe the same class of part: a roll-bonded copper-aluminium disc that goes into a bolted joint so each conductor only ever touches its own metal. The table maps each string to the size we stock, using our own dimensions rather than any third party's. One name does not belong in that family: where a drawing says only transition washer, it can also mean a profiled copper-alloy washer, which is copper alloy throughout — how a bimetallic washer differs from a toothed one settles which part the line item is asking for before you match a code to it.

Confirm before ordering. The rows are mapped by bolt size and nearest outer diameter — the bolt sets the bore, but the lug palm sets the outer diameter, so check it against your lug first. 880112 is usually published at Ø28 mm, which falls between our M12 at 26 mm and our large M12 at 30 mm; the lug decides, and the threshold is the cross-section it is crimped onto: up to 240 mm² take the 26 mm (ICALCU12CS2), 240–400 mm² take the 30 mm (ICALCU12CS). Every dimension in the table is ours, and published figures for these designations disagree with each other — see check 3 below before you order to a drawing.

The distributor codes above stop at M12. Our range does not: the full washer range with net list prices runs to 11 stocked sizes, 16–46 mm outer diameter, for lugs up to 630 mm². The priced rows are directly linkable — ICALCU6CS, ICALCU8CS, ICALCU10CS, ICALCU10CS2, ICALCU12CS2 and ICALCU12CS — and every row there carries a quantity field that builds the enquiry for you.

Sheet part numbers — the VCUP and HI-CUP designations

VCUP1 and VCUP2 designate a 500 × 500 mm CUPAL sheet in 0.5 mm and 1.0 mm; the same two sheets circulate on Hungarian and German BOM lines as HI-CUP-0.5 and HI-CUP-1.0. That is the same sheet we supply as TCUP05 and TCUP10, orderable directly at the net list price shown on the product page. A sheet is a larger commitment than a washer, so confirm the thickness before you order.

The material is 70 % aluminium (AL 99.5, Werkstoff-Nr. 3.0255) over 30 % copper (E1-Cu58, Werkstoff-Nr. 2.0065), bond strength 70–110 N/cm — the full figures are in the technical datasheet. Net list prices and quantity fields are on the product page: TCUP05 and TCUP10. The 500 × 2000 mm format and any other geometry are quoted within 24 hours rather than list-priced.

Strip part numbers — and where we cannot ship from stock

The J. Pröpster designation 1053 is a 500 × 40 mm bimetal strip, typically used for a lightning-protection transition; it also appears under distributor SKUs such as JPR1053. It is the one code on this page we cannot supply from stock. Our stock strip is 500 × 40 × 0.5 mm; 1053 is normally published at 0.8 mm.

Two things follow. First, 0.8 mm sits comfortably inside our custom range, so we can make it — as a cut, not a stock pick: quote within 24 hours, 5–10 working days, no list price, because the 500 × 40 × 0.5 mm stock strip is the only strip we hold. Second, the published thickness for this code disagrees across sources: 0.5 mm and 0.8 mm both appear against it, and 0.5 against 0.8 is a 60 % difference in section — not a rounding error. Measure the part you already have, or send us the drawing, and we confirm the thickness before anything is cut.

Cable-lug part numbers — how to read an ICALCU code

There are 109 lug SKUs, so instead of listing them all, here is how to read your own code. A tubular eye-lug is ICALCU<cross-section><bolt>, so ICALCU24016 is 240 mm² for an M16 bolt. A butt-splice is ICALCU<Al><Cu>V — ICALCU1610V joins a 16 mm² aluminium conductor to a 10 mm² copper one, and splices carry no bolt size at all. A pin lug is ICALCU<Al>B<pin Ø>V, so ICALCU95B12V is 95 mm² with a Ø12 mm copper pin. Eye-lugs cover 10–625 mm² with M8 to M20 bolt holes, to DIN 46329; splices join Al 16–500 mm² to Cu 10–400 mm²; pin lugs stop at 300 mm² and Ø18 mm. Codes ending in CS are not lugs but washers — those are in the table further up. Decode the string, then find the row in the full ICALCU cable-lug range.

How to confirm it really is the same part

A matching code is a lead, not a confirmation. Four checks settle it, in this order.

1. Start with the bolt size

The bore has to match the bolt, and nothing else about the joint changes that. An M10 bolted joint takes an M10 washer, whatever the catalogue calls it. If your source publishes no bore at all — and many of the Hungarian listings carrying the four-digit codes publish no dimensions whatsoever — the M-size in the description is the only thing you can rely on from it.

2. Check the outer diameter against the lug palm

This is where two parts with the same M-size stop being interchangeable. The washer has to cover the whole contact face of the lug, not just the ring around the bolt, so measure the palm and pick the outer diameter that covers it. That is why 880112 maps to two of our SKUs: our M12 exists at 26 mm for lugs up to 240 mm² and at 30 mm for 240–400 mm². The full washer range lists the maximum lug cross-section against every outer diameter.

3. Treat the published dimensions as figures to confirm, not to assume

Every CUPAL washer we stock is 2 mm thick, which is also why stepping up an outer diameter never changes the bolt length you need. Published figures for the same designation do not agree with one another. Against the M10 codes you will find both 10.5 mm and 11 mm bore, both Ø23 and Ø26 mm outer diameter, and both 1 mm and 2 mm thickness — including under the manufacturer number and EAN printed on the ICALCU10CS row above, which lead to listings giving 1 mm against the 2 mm we hold. Against the 1053 strip, both 0.5 mm and 0.8 mm appear. Every figure in the tables above is ours. If your drawing or your existing stock is specific, measure the part or send us the drawing, and we confirm against it before you order rather than after.

4. Decide what certificate you need

An EN 10204 2.2 material certificate ships with every order as standard, and 3.1 is available on request. If you are replacing a part originally bought elsewhere and the specification calls for documented material, ask for 3.1 when you request the quote — arranging it with the order is straightforward; obtaining it after the goods have shipped is not. The difference between the two grades is set out in the EN 10204 material certificate article.

Can't find your part number? Send us the designation and the drawing — we confirm within 24 hours which of our sizes matches it, or cut it to size from your drawing if none does. Get in touch.