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Keys and security parts
All Containers›Shop by use case›Keys and security parts›Getting started›A spring clings to a plastic jarShop all keys and security →
Getting started

A spring clings to a plastic jar

By Dwight Davis, Founder

On this page15
195 of 251 containers will hold a tumbler spring against their wall.

A tumbler spring is a few millimetres of steel wire

Light, springy, and almost weightless. Which makes it the article most affected by anything other than gravity.

And a plastic jar takes a static charge

Handled, rubbed against a bench or tipped out and back, a polypropylene or PET wall holds a charge that a light steel part will cling to.

So the spring does not come out

It sits on the inside wall above the heap, and tipping the jar does not move it.

Which is a real cost on a small part

Because the whole point of a sorted container is getting one out without hunting.

Glass does not do it

56 of the 251 containers. Glass does not accumulate a surface charge the way a polyolefin does, and a spring in a glass jar falls out.

So the split is four to one the wrong way

117 PET and 78 polypropylene against 56 glass. 195 plastic containers on a shelf where glass is the better answer for two of the four leaves.

A lock pin has the same problem

A small steel cylinder, light enough to cling. Two of the four leaves are light steel parts.

A key blank is heavy enough not to

Which is the other half of the group, and for a blank the problem is scratching rather than static.

A padlock part is in between

Depending on what it is: a shackle is heavy and a spring or a detent is not.

So the four leaves divide on weight

Light steel clings and heavy steel scratches, and the material answer differs for each.

And the shelf is weighted toward the wrong material for both

195 of 251 plastic, which scratches a blank and holds a spring.

Which is the honest statement of this shelf for this group

The 56 glass containers are the ones to look at and they are a fifth of what is offered.

And the closure does not help with static

179 of the 288 closures here are a plain polypropylene lid, which is the same material as the jar it closes. The charge is on the wall rather than at the mouth.

Which is why five of this property's six sections are about the container.

References

The Davis Pack Supply catalog, measured 19 October 2026. The 251 containers on this shelf are 117 PET, 78 polypropylene and 56 glass, so 195 plastic against 56 glass, a little over four to one. For a small metal part the difference is practical: glass does not scratch, does not haze and does not take a static charge, and both plastics do all three.
The Davis Pack Supply catalog, measured 19 October 2026. 539 rows: 251 containers and 288 closures. This is the store-small-dry shelf, shared identically by nine groups, and the sewing notions property enumerates the inventory. 5 to 500 mL with a median of 177, with 60 containers under 60 mL and 22 under 30. 210 jars, 27 bottles, 12 tubs and pails, 2 tubes. Buyability, a snapshot: 159 of 251 available, 91 not, 1 unrecorded; 93 quote only; 65 full case only, with case packs from 12 to 6,370 and a median of 288.
Written from 18 U.S.C. 1704 and from the catalog as it stood on 19 October 2026. That section is a theft and forgery statute about keys to Postal Service locks and says nothing about containers, labeling or packaging; it is quoted because it is the federal provision that names a key. Nothing here addresses the lawfulness of making, holding or selling any key or key blank, locksmith licensing, restricted keyways, key duplication, or whether any mark has legal effect, and nothing here would assist anybody in defeating a lock. This shelf is shared identically by nine groups and the sewing notions property enumerates the inventory.