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Quilting
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The products

The blade has to go in through the mouth

By Dwight Davis, Founder

On this page11
Ninety three of 181 clear sixty millimeters. A hundred and fifty six clear forty five.

A rotary blade is a disc and a disc cannot be tipped in edgewise

It has to pass through the opening flat or at an angle, and the opening is described by the neck finish rather than by the capacity or the outside diameter.

Rotary blades come in three common diameters

Twenty eight millimeters, forty five, and sixty. Forty five is the usual one, twenty eight is for curves and sixty is for cutting through several layers at once.

The first number in a neck finish is its nominal diameter in millimeters

So a 70-400 finish is nominally seventy millimeters across and an 18DIN is nominally eighteen. Reading the field that way turns it into a fit test.

Eleven distinct nominal sizes appear on this shelf

18, 38, 48, 53, 58, 63, 70, 75, 83, 89 and 100 millimeters. The distribution is 55 at seventy, 36 at fifty eight, 27 at eighty nine, 16 at fifty three, 14 at eighteen and 11 at forty eight, with the remaining six sizes carrying twelve rows between them.

A twenty eight millimeter blade clears 157 of the 181 containers

Everything except the fourteen 18DIN rows and the ten rows that record no neck finish at all. Which is almost the whole shelf.

A forty five millimeter blade clears 156

One fewer, because the 38 millimeter row drops out. So the common blade size costs almost nothing in choice, which is the comfortable answer.

A sixty millimeter blade clears 93

Just over half the shelf. The 48, 53 and 58 millimeter finishes all fall away, and those three account for 63 rows between them.

So the large blade is the one that actually constrains the choice

And it constrains it on a field most buyers read as a lid compatibility code rather than as an aperture. The capacity figure gives no warning at all: a 118 mL jar can have a 48 millimeter neck or an 89.

Ten rows cannot be screened this way

They record no neck finish, so they return nothing to the test in either direction. The right reading is that they are unanswered rather than that they fail.

And nominal is not the same as measured

A nominal seventy millimeter finish is a thread specification, not a caliper reading of the opening. The page uses it as a sort order and a rough screen, which is what it can support, and nothing here states an actual aperture for any container.

References

The Davis Pack Supply catalog, measured 19 October 2026. 181 containers: capacity 5 to 354.882 mL with a median of 118.294; 83 PET, 64 polypropylene, 34 glass; nine colors of which 52 are clear, 39 white, 25 amber and 23 black; 157 jars, 18 bottles, 4 tubs and pails, 2 tubes. Height 0.5 to 5.33 inches with a median of 2.27, recorded for 168 of 181; diameter 0.617 to 4.5 inches with a median of 2.57, recorded for 159. Case packs run 12 to 6,370 with a median of 350. Availability, a snapshot and not a promise: 116 of 181 marked available, 64 not, one unrecorded. These are outside dimensions.
The four leaves in this group as the catalog indexes them: binding clip, quilt pin, rotary blade and template part. 16 CFR part 1610 classifies the flammability of clothing textiles and does not reach any of them. No closure on this shelf is recorded as child resistant.
Written from 16 CFR part 1610 and from the catalog as it stood on 19 October 2026. Part 1610 is the Standard for the Flammability of Clothing Textiles and it classifies fabric by how fast a flame spreads across a test specimen; it does not govern clips, pins, blades or templates, and nothing here says it does. No container on this shelf is described as fire resistant, flame retardant or rated for anything, and no liner is described by what it will achieve in any particular use. This shelf is a subset of the store-small-dry shelf and the sewing notions property enumerates that shelf in full.