Canning jar bands and rings

The screw band is the least interesting object in canning and the one most surrounded by folklore. It is also the only part of the two-piece system you are meant to keep, which makes "when do I throw one away" a real question with a boring answer.

What follows is what the bands actually do, the two ways of getting them wrong, and where to buy them on their own — which is harder than it should be, because the biggest brand does not sell them that way.

What a band is for, and when it stops mattering

During processing the band holds the flat lid against the rim while air escapes from the jar. After the jar cools, the seal is a vacuum and the band is redundant. That is why the NCHFP says plainly: "Screw bands are not needed on stored jars."

Bernardin — Newell's own brand, the same lid system as Ball and Kerr — gives the clearest account of why tension matters during that window: "Heat causes expansion of food and gases inside the jar during processing... Glass does not expand, so the pressure needs an outlet. When lids are applied fingertip tight the excess gasses (or pressure) can escape. This action is called 'venting'. If lids are applied too tightly 'venting' is prevented."

How tight is fingertip tight?

NDSU Extension gives the only definition with a number in it: "place the screw band on the jar, turn it just until you feel resistance, then turn the band one-quarter turn more." Bernardin's version is to screw the band down with your fingers only "until you meet a point of resistance" and not to use the full force of your hand or a utensil.

Two techniques that circulate and should not. Bernardin retires the first by name: "Applying screw bands very tightly, then backing them off a quarter turn is an outdated method that does not work successfully." And the second is retightening after processing, which every source forbids — the NCHFP's wording is "Do not retighten lids after processing jars," because the contents are contracting and pulling the lid down as they cool.

How we screened these

We have not torque-tested bands. What we checked is which makers publish anything at all about material and fit, what counts as a reusable band per extension guidance, and which packs match how bands are actually bought — as replacements, or alongside a bulk jar purchase. The method is on how we pick.

• Correct mouth size. Regular is 70 mm, wide is 86 mm, and bands are not interchangeable.
• Count that matches the need. A top-up after a rusty season, or a hundred to go with a pallet of jars.
• Threads that turn cleanly. The one quality variable that shows up on canning day.
• A published material spec, where one exists. Ball publishes tin-plated steel; most brands publish nothing.
• No unverifiable claims. See the note on stainless below.

Quick picks

Every pick below is screened against the National Center for Home Food Preservation’s published canner rules first. Tap a row for the full write-up.

#	Product	Best for	Key spec	Price
1	ForJars Canning Rings, Regular Mouth (100)A hundred regular-mouth bands in one box, which is the quantity that actually matches how bands get lost, rusted and left on jars. ForJars sells rings separately — something Ball does not do on its own site, where bands come bundled with lids you may not need.	Restocking a whole shelf	100 rings, regular mouth	$31.90 · View on Amazon→#ad we earn a commission · price as of October 18, 2026
2	Regular Mouth Canning Bands, 24-PackThe small box, for the household that has lost or rusted a dozen bands over a few seasons and does not need a hundred. Bands are the one part of the two-piece system that is genuinely reusable, so replacing a handful is usually all that is called for.	Replacing the rusted ones	24 bands, 70 mm	$9.99 · View on Amazon→#ad we earn a commission · price as of October 18, 2026
3	Regular Mouth Canning Rings, 100-PackThe bulk box, and the one that makes sense alongside a pallet of jars or a case of lids bought without bands. Nothing about a band is technical — it holds the lid on during processing and then comes off — so quantity and thread quality are the whole decision.	Outfitting a bulk jar buy	100 rings, 70 mm	$29.99 · View on Amazon→#ad we earn a commission · price as of October 18, 2026
4	Various Leaving bands on jars in storageSkipNot a product, a habit — and the one that quietly costs people both bands and jars. The NCHFP is direct: "Screw bands are not needed on stored jars... If left on stored jars, they become difficult to remove, often rust, and may not work properly again." Worse, a band can hold a failed lid down so the jar looks sealed when it is not.	Nothing - take them off	Hides failed seals, rusts on	Check price on Amazon→#ad we earn a commission · live price pending

#1·Restocking a whole shelf

ForJars Canning Rings, Regular Mouth (100)

A hundred regular-mouth bands in one box, which is the quantity that actually matches how bands get lost, rusted and left on jars. ForJars sells rings separately — something Ball does not do on its own site, where bands come bundled with lids you may not need.

$31.90 · View on Amazon→#ad we earn a commission · price as of October 18, 2026

Published specs

Count

100 rings, regular mouth

Maker's material claim

ForJars' own site says the rings are "made with high-quality metal" and does not publish a material spec

Fit

"Fits Regular Mouth Ball Jars" (ForJars)

Use

"Safe for boiling and pressure cooking" (ForJars)

Guarantee

"We offer a 90-day guarantee on our products" (ForJars)

What works

• +Bands sold on their own, in a count that matches a real canning shelf rather than a 12-pack bundled with lids
• +ForJars is one of the few lid-and-ring brands with a real company site publishing specifications and a guarantee
• +Rings are reusable indefinitely in practice — NCHFP says they "may be used many times" if washed, dried and stored dry

What to know first

• −The Amazon listing describes the rings as stainless steel; ForJars' own product page says only "high-quality metal", so treat the stainless claim as unverified by the maker
• −No extension or NCHFP source addresses band material at all, so nobody independent has evaluated whether a stainless band outperforms tinplate
• −A hundred bands is more than most households need — Ball's are tin-plated steel and last years if you take them off the jars

Specs from ForJars, 100 Regular Mouth Rings, NDSU Extension, Put a Lid On It!. We have not handled this product — see how we pick.

#2·Replacing the rusted ones

Regular Mouth Canning Bands, 24-Pack

The small box, for the household that has lost or rusted a dozen bands over a few seasons and does not need a hundred. Bands are the one part of the two-piece system that is genuinely reusable, so replacing a handful is usually all that is called for.

$9.99 · View on Amazon→#ad we earn a commission · price as of October 18, 2026

Published specs

Count

24 bands, regular mouth (70 mm)

What bands do

Hold the flat lid in place during processing; they are not part of the seal afterwards

When to replace

Penn State: "The bands are reusable unless rusty, bent, or dented."

Note

Generic brand; specifications here come from the listing rather than a maker's page

What works

• +The right quantity for a top-up, which is what band buying usually is
• +Regular mouth is the size most households own most of, and bands are not interchangeable between mouth sizes
• +Cheap enough that retiring a rusty band is an easy decision rather than a judgment call

What to know first

• −No manufacturer page behind it — the listing calls the rings "Tinplate Metal" and "Durable & Rustproof", but there is no maker's site to check the coating claim against
• −Bands vary in thread quality between generic runs; check that they turn smoothly onto your jars before canning day
• −If yours are rusting quickly, the fix is usually storage — NDSU advises against washing bands in a dishwasher because it raises the rusting risk

Specs from Penn State Extension, Canning Jars and Lids - An Update, NDSU Extension, Put a Lid On It!. We have not handled this product — see how we pick.

#3·Outfitting a bulk jar buy

Regular Mouth Canning Rings, 100-Pack

The bulk box, and the one that makes sense alongside a pallet of jars or a case of lids bought without bands. Nothing about a band is technical — it holds the lid on during processing and then comes off — so quantity and thread quality are the whole decision.

$29.99 · View on Amazon→#ad we earn a commission · price as of October 18, 2026

Published specs

Count

100 rings, regular mouth (70 mm)

Fit

Standard 70 mm regular mouth Mason-type jars

Storage

Remove after the jars seal, wash, dry, and store dry (NCHFP)

Note

Generic brand; specifications here come from the listing rather than a maker's page

What works

• +Lowest cost per band of the options here, which matters if you are buying jars by the case
• +Having spares means never leaving bands on stored jars because you needed them elsewhere
• +Bands outlive flats many times over, so a bulk buy is a long-horizon purchase rather than a consumable

What to know first

• −Unbranded, with no published material or coating
• −A hundred bands take up real shelf space and you only need as many as you process at once
• −Bands that arrive slightly out of round are a real nuisance on canning day — check a few before you need them

Specs from NCHFP, Using Boiling Water Canners, Penn State Extension, Canning Jars and Lids - An Update. We have not handled this product — see how we pick.

VariousLeaving bands on jars in storageNo single listing to picture

Skip this one·Nothing - take them off

Leaving bands on jars in storage

Not a product, a habit — and the one that quietly costs people both bands and jars. The NCHFP is direct: "Screw bands are not needed on stored jars... If left on stored jars, they become difficult to remove, often rust, and may not work properly again." Worse, a band can hold a failed lid down so the jar looks sealed when it is not.

Check price on Amazon→#ad we earn a commission · live price pending

Published specs

NCHFP

"You can more easily detect some types of spoilage in jars stored without screw bands. Growth of spoilage bacteria and yeast produces gas which pressurizes the food, swells lids, and breaks jar seals."

Penn State

"Screw bands should be removed after the jars have sealed and cooled; do not leave the bands on the jars during storage."

What to do instead

Remove after 12-24 hours, wash, dry thoroughly, store in a dry place

Also

NCHFP: "Dampness may corrode metal lids, break seals, and allow recontamination and spoilage."

What works

• +Leaving bands on does make jars easier to carry, which is the only argument for it and not a good enough one

What to know first

• −A band can hold an unsealed lid in place, hiding exactly the failure you check the shelf for
• −Bands rust onto jars and stop working, turning a reusable part into a consumable
• −Moisture trapped under a band corrodes the lid, which NCHFP links to broken seals and spoilage

Specs from NCHFP, Using Boiling Water Canners, Penn State Extension, Canning Jars and Lids - An Update. We have not handled this product — see how we pick.

The stainless steel question

You will see bands advertised as stainless steel, usually at a premium, with the promise that they never rust. We could not verify that claim in any source we trust, and we looked hard.

• No extension source addresses band material at all. Not NCHFP, not Penn State, Iowa State, NDSU, Clemson, Utah State or Minnesota. The topic simply is not covered.
• Ball publishes tin-plated steel in its own specification table, and lists its lids and bands as not dishwasher safe.
• ForJars' own product page says its rings are "made with high-quality metal" and publishes no material spec, even though retail listings for the same rings say stainless.
• So treat "stainless" as a listing claim, not a verified specification, and certainly not as a safety difference — there is no tested-process reason to prefer one band material.

If your bands rust quickly, the likelier culprit is storage rather than metallurgy. NDSU advises washing bands by hand rather than in a dishwasher "because this can increase the risk of the metal pieces rusting", and Penn State says to dry them completely and keep them out of a humid basement.

When a band is finished

There is no service life in years or uses anywhere in the literature — every source gives a condition rule instead. Penn State: "The bands are reusable unless rusty, bent, or dented." The NCHFP: when removed, washed, dried and stored dry, "screw bands may be used many times." The NCHFP's own blog is the most relaxed of all: "bands can be used over and over until they rust or get bent."

What to look at before canning day, not during it: a band that will not turn smoothly onto a jar, one that is out of round after being pried off a stuck lid, and any rust on the threads or the flat top. A rusted band is not a contamination hazard so much as a torque problem — it will not tighten evenly, and even tension is the whole job.

Buying bands separately

This is oddly hard. Ball's own accessories category sells lids and bands together in twelve-packs and does not list a bands-only product, which means replacing a dozen rusty bands through the biggest brand also means buying a dozen flats you may not need. The brands that do sell rings alone — ForJars and Superb among them — are the practical answer.

• Match the mouth size to your jars, not to the box that looks cheapest.
• Buy in a count that matches your canner load, plus spares — seven quarts per load means seven bands in use at once.
• Keep them out of the dishwasher, per NDSU, and dry them before they go away.
• Store them off the jars, which is the whole point of the section above.
• Do not buy bands to fix a sealing problem — that is a lid, rim or headspace issue. The diagnosis is in canning lids not sealing.

The decision, in one paragraph

If you are replacing a handful, buy the 24-pack in your mouth size and move on. If you have just bought jars by the case or lids without bands, the 100-count boxes cost less per band than any other format — ForJars if you want a brand with a real company site and a guarantee behind it, the generic box if you do not. Then take them off your sealed jars, dry them, and they will outlast several seasons of flats.