To order, go to spark plug boxes. The specification below reflects how this category actually behaves: small cartons, heavy contents, and far more SKUs than anyone expects.
Measure the plug, including the terminal
A plug is not just a body. Measure the full length from the terminal nut to the electrode tip, the hex across flats and, more importantly, across corners, since the corner dimension is the one that sets the internal width. If the plug ships with the terminal nut fitted or removed, that is a different length, so decide the packed state and measure it.
Keep the ceramic still
The insulator is the fragile part, and the failure mode is a plug moving inside a slightly oversized carton, tapping the board repeatedly through a long transit. Tight is protective here. Options range from a close-fitting sleeve, where the carton itself holds the plug, to a die-cut collar or a simple partition for multi-packs. For multi-packs, remember that every divider wall costs internal width, so measure the loaded divider set rather than calculating from plug diameters.
Part numbers and the shelf
| Where the number is read | Design requirement |
|---|---|
| Facing forward on a shelf | Large, high contrast on the front panel |
| End on, in a stacked bin | Repeat the number on both end panels |
| Scanned at a counter | Barcode on a flat panel, off creases and glue areas, with quiet space around it |
| In a technician's hand | Readable in poor light, so avoid low-contrast styling |
This is a category where legibility beats styling. A beautiful carton whose part number cannot be read from a parts bin creates picking errors that cost more than the packaging does.
One die, a whole catalogue
Most aftermarket ranges use a small number of physical plug formats across a very large number of part numbers. If the plug dimensions are shared, a single cutting die covers the entire catalogue and only the printed part number and artwork change between SKUs. Because the die and the plates are included, that is the efficient way to run this: settle one carton spec, then vary print. If you run several plug lengths, expect one die per length rather than one per part number.
Board and print
Small dense cartons need board that holds an edge rather than board that feels premium. A dense product in a thin carton will crush at the corners in a shipping case. If cartons travel inside a master carton, specify that too: the external size of the individual carton becomes the internal requirement of the master, and the count per master should be a number that fits the case cleanly.
Ordering
Minimum order is 100 boxes. Price starts from about $0.48 per unit at bulk volumes and is confirmed on your written quote, since board, print coverage and SKU count all affect it. Design support, US shipping and a digital proof before anything prints are included. Production runs from West Chicago in the US and Guangzhou in China, in three lanes: rush (expedited production plus air freight, a premium of about 7 to 25% depending on the job), standard (air) and cost saver (sea), from about 7 business days, plus 2 to 5 for delivery.
If your master carton is part of the same project, what C flute corrugated is covers the board choice for the outer case. Send your plug dimensions, your SKU count and your master carton count through the quote form, then order at spark plug boxes.
