We made a few adjustments to the copper plate stock list this month. Some sizes were added, a couple were dropped, and the way we list thickness and tolerance got a little clearer. None of it is dramatic, but if you buy plate rather than coil, the changes are worth a look before you send the next RFQ.

The biggest addition is in C11000 plate. We brought in 0.500 in. and 0.750 in. thicknesses in 12 in. x 12 in. and 12 in. x 24 in. blanks, and we now hold 0.375 in. in 12 in. x 48 in. pieces. These are not mill-length plates sitting on a rack waiting for a saw. They are cut blanks, deburred and checked for flatness, aimed at shops that need a few pieces for a busbar job, a fixture or a mold repair and do not want to order a full plate and pay for the drop. The 0.500 in. and 0.750 in. sizes came directly from repeat requests we kept losing to special order. The 0.375 in. length was added because the shorter 12 in. x 24 in. piece was being ordered in pairs for the same job, and the longer blank cuts down on handling and scrap.

We also added C10100 plate in 0.250 in. and 0.500 in., but only in 12 in. x 12 in. pieces. That is a deliberate limit. C10100 is not a volume item for most of our customers, and stocking it in multiple widths and lengths would tie up money in a grade that moves slowly. If you need a different size, we can still quote it, but it will come through as a make-to-order item with the lead time that implies. The same applies to the tellurium copper plate we list—stock is limited to a couple of thicknesses in small blanks, and everything else is quoted against a mill schedule.

Two sizes came off the list. The 0.125 in. C11000 plate in 12 in. x 48 in. was discontinued because the flatness on that thickness over that length was inconsistent from the mill, and we were spending too much time screening sheets that should have been ready to ship. The other removal was a 0.875 in. plate that had been on the list for over a year with almost no movement. If someone needs either size, we can still source it, but it will not be a stock item.

The tolerance column got a small but useful change. We now state the thickness tolerance range rather than just the nominal thickness. A 0.500 in. plate is not always 0.500 in. everywhere, and the allowable range depends on the mill and the standard. Listing the range up front avoids the back-and-forth that happens when a customer measures the plate on receipt and finds it at the low end of the tolerance. We also added a note on edge condition: stock plate is supplied with a mill edge or a sheared edge depending on the size, and we say which one applies. That matters for anyone clamping the plate in a fixture or welding to the edge.

Cut-to-size rules changed slightly. We used to quote cut plate on a per-piece basis with a minimum charge. Now the quote shows the piece price and the cutting charge separately, which makes it easier to compare against buying a larger blank and cutting it in-house. The minimum order for cut plate is still small—one piece is fine—but the cutting charge is what it is, and hiding it inside a single number was not helping anyone.

Lead times on stock plate are running about three to five working days for the sizes listed, assuming the order is placed before the cut-off and the plate does not need additional processing like edge rounding or protective film. Non-stock thicknesses and grades are quoting four to eight weeks depending on mill scheduling, and we would rather say that now than after the PO is in. Packaging is unchanged: plates ship flat, interleaved where needed, banded to a skid, and wrapped for transit. If you need a specific package for a jobsite or an export shipment, say so on the order.

One thing that did not change is the certificate requirement. Every plate shipment includes a mill test certificate matched to the heat number, and we can provide PMI results on request. That has been standard for a while, and the stock list changes do not affect it. The list itself is updated on the website, and the part numbers for the new sizes are live. If you were quoted a size that is no longer stocked, the quote will still show the make-to-order path, but the stock alternative—if there is one—will be flagged. That is the practical summary: a few more blanks on the floor, a couple of slow movers gone, and a clearer line between what is on the shelf and what is not.