A custom ring starts with one measured number: the diameter of the thing it has to fit. Everything else, the ring width, the board thickness, the cut quality and the packing, is a decision that follows. Most enquiries that stall do so because the diameter was given as a nominal size rather than a measured one.
Start from the measured diameter
Measure the product at three points around the circumference, not one. Coils and rolls are not perfectly round, and a ring cut to the smallest reading will not go on; one cut to the largest will be loose everywhere else.
State whether the diameter is inside or outside, and whether the ring has to pass over a flange, a wrap or a core. A flange changes the ring from a simple annulus into a stepped part.
Specification at a glance
The table is the set of inputs a ring drawing needs. Anything missing becomes an assumption, and an assumption becomes a remake.
| Input | What to send | Why |
|---|
| Diameter | Measured OD or ID, three readings | Sets the inner cut |
| Ring width | Radial band in mm | Sets coverage and strap path |
| Board thickness | Preferred or by weight | Sets handling strength |
| Profile | Flat, stepped or flanged | Changes the cutting |
| Quantity | Per size, per order | Sets the run |
| Pack | Bundle or carton, labelling | Affects freight and counting |
Ring width, thickness and the contact you want
Ring width is a coverage decision: how much of the face should the board protect, and where does the strap cross. A ring that is narrower than the strap path does not do its job.
Board thickness is a handling decision. A light ring on a heavy coil will fold at the inner edge when the coil is set down; a heavy ring on a light roll is wasted board.
Cut quality and the edge that matters
The ring has two edges: the outer cut and the inner cut. The inner cut is the one that touches the product, so it needs to be clean. A ragged inner edge is where a ring starts to delaminate in handling.
Where the ring is assembled from more than one piece, the joint position matters. Keep it away from the strap line and away from the point that takes the load.
Questions buyers ask before ordering
Can you make a ring to my drawing?
Yes. A drawing or a measured sample both work; a nominal size does not.
What if my product is not perfectly round?
Give three readings and the tolerance you can accept, and the ring is cut to the fit you need.
Can the ring be stepped for a flange?
Yes, but say so at enquiry because it changes the cutting and the tooling.
What is the minimum order for a custom ring?
It depends on the diameter and the cut; it is confirmed per drawing.
Can custom rings be printed?
Yes, one or two colours, usually on the face that stays visible.
Send the product diameter, ring width and board thickness to mona@hengnicepacking.com and we will quote the ring that fits.
