Glass Mayo Jars Wholesale: Economy Jars for Sauces & Spreads

Filed under wide-mouth food jars; the moulds we quote for this are pictured at the foot of the page.

An economy mayo jar is a wide-mouth, straight-sided glass jar on a lug (twist-off) finish, made in sizes from 2 oz to 32 oz with 48 mm, 58 mm, 63 mm or 70 mm necks. For mainstream mayonnaise the usual specification is the 16 oz jar on a 70 mm lug finish: 500 ml overflow capacity, 75 mm body, about 240 g of glass. It takes a piston filler nozzle, hot-fills at 85°C when headspace and cooling are controlled, and holds vacuum under a standard metal lug cap.

Sizes, finishes and dimensions

Choose capacity by sales channel first. Club stores and foodservice lean toward 24 oz and 32 oz, mainstream retail sits on 16 oz, and the 2 oz to 8 oz jars go into sampler packs, airline and hotel supply and single-serving lines. The 16 oz is the volume size of the category, which is also why cap supply and line-speed data are most developed for it.

Read the overflow column carefully if you hot-fill. Product at 85°C occupies roughly 3 percent more volume than it does cold, so brim capacity has to sit at least 4 to 6 percent above the fill volume you declare.

Two points help when planning a range. A family of 8 oz, 16 oz and 32 oz jars can usually run on just the 58 mm and 70 mm finishes, which halves the cap stock and shortens capper changeovers. And a brand shrinking a 32 oz pack to 24 oz keeps the same 70 mm finish and a similar body profile, so the caps stay and the filler needs only minor adjustment.

The same jars fill tartar sauce, aioli, sandwich spread and thick salad dressing in exactly the same way. For chunky products above 32 oz we point buyers to the larger pickle jar sizes, and for pourable hot sauce or BBQ sauce, where a narrow neck controls the pour, to glass sauce bottles. Thinner sauces filled by gravity or pressure are covered under condiment bottles.

Why the jar is wide-mouthed and straight-sided

Both features are functional. On a standard 16 oz jar the 70 mm opening is roughly 85 percent of the body's outer diameter, where a narrow-neck sauce bottle may open at only 38 mm or 43 mm. That width lets a large filler nozzle travel down into the jar, and it lets the shopper see how much is left.

Straight walls matter because mayonnaise is scooped, not poured. A shoulder curve or a tapered waist leaves a zone a knife or spoon cannot reach, and residue left behind is among the leading complaints in the spread category: shoppers discount the wasted grams from what they think the pack is worth. In a straight-sided 24 oz jar a standard tablespoon reaches every surface. The same reasoning applies to jars for pasta sauce and to wholesale pickle jars, and it explains why this silhouette has barely changed in half a century.

The shape is also easy to make well. Straight walls suit press-and-blow forming and anneal evenly, and glass is placed where strength is needed instead of in decorative features. Typical figures for the 16 oz jar are a body wall of 2.4 mm to 3.0 mm and a vertical load rating above 180 kg, enough for cases stacked six layers high in a warehouse. The base is designed to stay upright on conveyors running at 200 to 400 jars per minute.

Lug finish dimensions and cap matching

The lug finish, also called twist-off, uses interrupted thread segments instead of a continuous thread. The four diameters divide the range like this:

• 48 mm for small jars from 2 oz to 6 oz
• 58 mm for the 8 oz to 12 oz middle of the range
• 63 mm for 12 oz to 16 oz jars under some regional standards
• 70 mm for 16 oz to 32 oz, where most mayonnaise is sold

Most mayo jars carry a 4-lug or 6-lug layout, and the cap seats with a quarter-turn. The dimension to watch is T, the outside diameter across the thread, which is held within ±0.15 mm so that standard metal lug caps from the major closure makers fit. The thread engagement angle and the gasket land, the flat rim where the cap's plastisol gasket presses on the glass, are controlled dimensions on the finish drawing as well.

The mistake we see most often is treating a 70 mm lug finish and a 70 mm continuous-thread finish as interchangeable. They are not. If you buy caps separately, check your cap maker's specification against the jar's finish drawing before anything is ordered; we send that drawing with the quotation and can have the finish matched to the tooling of the cap supplier you already use.

Caps, torque and tamper evidence

The closure is a metal lug cap with a plastisol gasket. Vacuum performance belongs to the jar and cap as a pair, because lug depth, thread profile and gasket hardness all act on each other, so we advise sourcing both together and having the combination torque-tested. For a 70 mm cap the test figures are an application torque of 8 to 14 inch-pounds and a removal torque of 6 to 12 inch-pounds after 72 hours of shelf simulation. Buyers who prefer a local closure supplier can work from the lug cap and twist-off lid specifications to align tolerances.

Tamper evidence in this system comes from a band that breaks the first time the jar is opened and from the safety button in the centre of the cap, which is held down by vacuum and rises if the seal is lost. Caps can be lithographed in up to six colors or matched to a brand color, and logos can be embossed or debossed on the crown at high volumes. The cap is the part a consumer handles at every use, which makes it a sensible place to spend on branding.

Lug caps do not feed like continuous-thread caps. They are normally applied by a steam-flush vacuum capper, which lines the lugs up with the thread segments while steam clears the headspace. Lug orientation diagrams and recommended chuck specifications should go to whoever runs the capper, including a co-packer's engineers if a third party fills your product.

Piston filling of high-viscosity product

Mayonnaise is a thixotropic emulsion: it flows under shear and holds its shape at rest, with a viscosity of 80,000 to 150,000 centipoise. That calls for a piston filler, typically with a cylinder bore of 50 mm to 100 mm. On a 70 mm finish a nozzle of 45 mm to 55 mm goes down through the mouth, starts depositing near the bottom and rises with the fill level.

Bottom-up filling is what prevents air pockets and splashing. Trapped air is more than a cosmetic fault, because the oxygen attacks the oil phase and can shorten shelf life from 18 months to under 9 months.

A well-maintained piston filler holds ±1 g to ±2 g on a 500 g fill, inside the metrology tolerances that apply to a 16 oz declared weight in the US and the EU. Body diameter on the 75 mm jar is held to ±0.8 mm, tighter than nozzle clearance needs, so the nozzle scraping seen on narrow-neck containers does not arise. Modern rotary piston fillers reach 300 jars per minute on the 16 oz size, and the low centre of gravity over a 75 mm base keeps jars from tipping at the infeed star wheel.

Ask for the dimensional drawing package early when specifying a new line or qualifying a co-packer. It lists body diameter, height, finish dimensions, base clearance and punt depth, which is what an equipment builder needs to design star wheels, timing screws and nozzle strokes. Projects go smoothly when those drawings reach the builder before the purchase order; when the jar turns up unannounced, time is lost redesigning change parts.

Hot filling at 85°C and vacuum sealing

Most commercial mayonnaise is acidified and filled warm. Neighbouring products such as salad dressings, spreadable cheese, chutneys and table sauces are often truly hot-filled at 82°C to 88°C to reach commercial sterility without preservatives. The jars are soda-lime glass, annealed and sampled lot by lot against a thermal shock differential of 45°C. Three things have to be managed together for the process to work.

Thermal shock during the fill

Product at 85°C meeting glass at room temperature creates a momentary difference of about 63°C, which is more than the test figure. It works in practice because a bottom-up fill warms the glass gradually from the base, keeping real stress well under the failure point. Product splashed against cold sidewalls does not give the glass that chance.

Headspace

Leave 6 mm to 10 mm between the product and the gasket land. With too little, expanding product reaches the gasket, contaminates the seal and can cost you the vacuum. With too much, the oxygen left inside shortens shelf life and can discolor oxidation-sensitive products such as aioli.

The vacuum itself forms as steam in the headspace condenses once the cap is on. The general range is 15 to 25 kPa; at an 85°C fill with a 8 mm headspace, a jar cooled to 20°C settles at approximately 18 to 22 kPa. That is enough to keep the safety button down, to resist cap back-off under transit vibration, and to give the pop on opening that goes with a shelf life of 12 to 18 months.

Cooling

Breakage in the field usually happens in the cooling tunnel, not at the filler, when cold water strikes one side of a hot jar. Cool in stages: water at 60°C in the first zone, 40°C in the second, near ambient in the last, so that the jar never faces a difference above 30°C at any moment. Buyers who run this profile report breakage below 0.1 percent across filling and cooling.

Products that cannot be hot-filled can be cold-filled, capped and passed through a tunnel pasteurizer in the same jars. In that case the heat is applied to a sealed container already at equilibrium.

Labels and decoration on the straight panel

A straight wall gives an unbroken cylindrical label panel. On the 16 oz jar the usable height is approximately 90 mm and the wrap is about 235 mm, with no shoulder to distort the artwork. Full-wrap paper or BOPP labels run on standard rotary labelers at more than 250 jars per minute, and because the panel does not taper, one design carries across the 12 oz, 16 oz and 24 oz jars with only the height changed.

Keep the label 5 mm to 8 mm below the finish and 10 mm above the base contact ring so its edges stay clear of handling wear. The other decoration routes are:

• Pressure-sensitive labels, for a more upmarket look.
• Applied ceramic labeling (ACL), fired into the glass for a permanent no-label finish that withstands dishwashing and abrasion.
• Screen printing in one to three colors, a middle route for mid-volume runs.

For chilled or humid retail, choose BOPP or ACL. Repeated condensation lifts the edges of uncoated paper within weeks. Standard flint glass transmits above 91 percent of light, so the white of the product does some of the selling, and a modest label that frames it often works better than one that hides it.

Plan for mandatory text before the branding. US, EU and UK rules each call for a nutrition panel, ingredient list, allergen declaration and net weight statement, which on a 16 oz jar typically take 35 to 45 percent of the label area. If you move down to 8 oz, check that the text still fits at a minimum of roughly 1.2 mm x-height under EU rules. A die-line template marks the label panel, finish clearance and base clearance for each size, and we will check a draft layout against the physical jar before plates are made, when a wrong wrap direction or seam position still costs nothing to change.

How the economy jar compares with a specialty jar

Economy describes the design, not the quality. Three things keep the format lean: less glass per unit of volume, denser pallets, and moulds that have been running for years and need no new tooling. On weight, the 16 oz economy jar comes in at approximately 240 g, while a jar of equal capacity with a shaped shoulder and embossing typically weighs 280 g to 320 g.

What a project costs is quoted individually, since it moves with the mould, decoration, quantity and freight terms. A common approach is to put core lines in the economy jar and express the brand through the label, the cap and the product, keeping a more distinctive shape from the glass jars with lids range for a flagship or limited edition. Clear flint glass with a clean label and a lithographed cap reads as a step up from plastic, and glass can be recycled indefinitely, which supports the sustainability claims retailers now ask suppliers for.

Inspection and export packing

On-line inspection checks finish dimensions, wall thickness and cosmetic defects such as stones, blisters and checks, with reject limits set at AQL 1.0 for critical defects and AQL 2.5 for major ones. Laboratory tests cover thermal shock at the 45°C differential, internal pressure resistance above 1.4 MPa, vertical load, and annealing grade read on a polariscope. Ask for a certificate of analysis with the measured values for the lot, and for reference samples to be kept so that a later question can be traced to a production window.

For the sea voyage, jars travel in corrugated dividers or shrink-wrapped tray packs on fumigation-free plywood pallets, with edge boards at the corners and stretch film. A 40-foot high-cube container takes approximately 42,000 to 45,000 pcs of the 16 oz jar, depending on how it is packed. The loading plan in the shipping documents should state gross weight, volume and pallet count. Related jar and bottle formats can share a container, which keeps a condiment range under one quality standard.

Frequently asked questions

What is the minimum order quantity?

It is quoted per project. The mould and the line it runs on decide the figure.

Will the jars crack when hot-filled?

Not if the process is set up as described above: fill from the bottom, hold the headspace, and cool in stages. The glass is tested at a 45°C differential and the format is used routinely for fills between 82°C and 88°C.

Which finish suits a 16 oz mayonnaise jar?

The 70 mm lug finish. It is the standard for this size, gives the widest choice of cap suppliers and the most nozzle clearance, and has well-established running data at 250 to 300 jars per minute.

Can caps be supplied with the jars?

Yes. Matched metal lug caps with plastisol gaskets are available for all four finishes, with tamper bands and safety buttons as standard, and ordering them together allows the seal to be validated as one system.

How much less does an economy jar cost than a specialty jar?

We quote this per project. The gap depends on the mould, the decoration, the quantity and the freight terms.

Which decoration holds up best?

BOPP labels or ceramic decoration for anything sold chilled or in humid conditions. Paper wraps are fine for ambient shelves, and screen printing is an option where a label is not wanted.