Hang Tag Thickness Guide for Parking Operators
Hang tag thickness is measured as caliper: points or mils, both thousandths of an inch. A 12-point tag is 0.012 inch thick. For paper stock, 14 to 16 point is the usual range for light-duty tags. Permits that hang on a mirror for months need heavier stock, a coated or synthetic face, or plastic. This guide explains the units, shows how thickness affects stiffness and life, and gives you a short spec list to send with any quote request.
TL;DR
- Thickness is caliper. Points and mils both mean thousandths of an inch, so 0.012 inch is 12 point.
- GSM and basis weight describe weight, not thickness. Two stocks with the same weight can differ in caliper and stiffness.
- Paper in the 14 to 16 point range suits short-term and indoor use. Permits that sit behind glass in summer sun call for heavier, coated, synthetic or plastic stock.
- Government permit specs show how far durability requirements can go: one state placard request specified white polyethylene at 0.023 inch thickness, UV resistant, with ink guaranteed for four years.
- Put thickness, unit, finish, finished size, hole and string in writing on every order so reprints match the original.
Table of Contents
- How hang tag thickness is measured
- What thickness does to a parking permit
- Choosing material and thickness by length of use
- The spec list to send with every quote request
- Our perspective
- Order permit products from Caymil
- Common mistakes when specifying thickness
- FAQ
- Sources
How hang tag thickness is measured
There are three common ways to describe paper. According to OKI’s paper weight guide, they are U.S. basis weight, metric weight (GSM, grams per square meter), and points or mils, an actual caliper reading of thickness. Only the third one tells you how thick the tag is. OKI’s example: media 0.012 inch thick is marked as 12-point media.
That matters when you read a spec sheet or compare quotes. A printer who quotes “16 pt” is describing a card about 0.016 inch thick. A printer who quotes “300 gsm” is describing weight per area. Neither number translates cleanly into the other, because coatings, fiber density and how the sheet was finished all change caliper at a given weight.
Points, mils and millimeters
| Unit | What it measures | Example | Where you see it |
|---|---|---|---|
| Point (pt) | Caliper, thousandths of an inch | 16 pt = 0.016 in | Paper and card stock in the U.S. |
| Mil | Caliper, thousandths of an inch | 18 mil = 0.018 in | Plastic sheet and PVC cards |
| Millimeter | Caliper, metric | 0.5 mm | Imported plastic and synthetic stock |
| GSM | Weight per square meter | 300 gsm | Metric paper specs, overseas quotes |
| Basis weight (lb) | Weight of a 500-sheet ream at the paper’s base size | 100 lb cover | U.S. paper categories such as text and cover |
One trap: the same “lb” number means different things in different paper categories, because each category uses a different base sheet size. A 100 lb cover stock and a 100 lb text stock are not the same thickness. When a quote says only “100 lb,” ask which category it refers to, or ask for the caliper.
Why GSM alone can mislead
GSM describes how much a square meter of paper weighs. It does not tell you stiffness, surface or coating. A bulky, uncoated sheet can be thicker than a dense, coated one of the same weight. If an overseas or online quote lists only GSM, request the caliper in points or mils along with a physical sample. Use that sample as the reference for the production run.
What thickness does to a parking permit
Thickness changes four things you care about as an operator.
- Stiffness. Thin stock curls and flops when it hangs from a mirror. Thicker stock holds its shape and keeps the permit number facing out.
- Handling life. Tags get pulled on and off a mirror, tossed on a dashboard and stuffed in a door pocket. Edges and the hole area wear first.
- Perceived authority. A rigid tag reads as an official permit. A floppy one gets treated like a flyer.
- Cost and storage. Heavier stock costs more per tag and weighs more to ship and store. Choose the lightest stock that survives the permit’s real life.
A practical thickness ladder
These ranges are working rules of thumb used across the print trade, not a universal standard. Confirm the caliper on the actual sample before you approve a run.
| Stock type | Typical feel | Best fit |
|---|---|---|
| 12 to 14 pt coated paper | Light, flexible | Single-event or same-day passes, indoor use |
| 16 to 18 pt coated paper | Sturdy, professional | Short-term visitor and event permits |
| 20 pt and up, or heavy cover stock | Rigid, substantial | Monthly permits, employee or resident tags |
| Synthetic or laminated paper | Stiff, tear and moisture resistant | Semester or season permits, humid or hot regions |
| Plastic (polyethylene, PVC) | Very rigid, waterproof | Annual or multi-year permits, disability placards |
Choosing material and thickness by length of use
Start with how long the permit has to look and work like new, then work back to material.
One day to one week
Visitor, contractor-day and event passes rarely need more than coated paper stock in the 14 to 16 point range. The tag only has to survive a single dashboard stay. Spend the effort on legibility: a large permit number, a date or color code, and a clear die-cut hole. Our guide to die cut hang tags covers hole and slot choices that keep tags from tearing at the mirror.
One month to one semester
This is where paper starts to fail. A windshield behaves like a greenhouse, and sunlight and heat can fade ink and warp plain cardstock. Heavier cover stock with a protective coating is the minimum for monthly permits. For a semester or a season, step up to a synthetic or laminated face. Stock with a reinforced hole also prevents the most common failure, the tag tearing free of its string. See how reinforced hang tags reduce reprints and citations.
Six months to multiple years
Annual permits, residential programs and facilities with long renewal cycles should look at plastic. Plastic does not absorb moisture, stays rigid, and holds printed numbers cleanly. Government agencies spec it for this reason. A New Jersey Motor Vehicle Commission request for disability parking placards called for white polyethylene at 0.023 thickness, UV resistant, resistant to temperature and humidity extremes over the life of the placard, with ink guaranteed for four years. That is a useful benchmark when you write your own spec for long-life tags. For a side-by-side look at the two families, read our plastic vs paper hang tag specs.
Sun, heat and fading
Thickness helps a tag stay flat, but it does not stop fading. Ink and coating decide that. If your permits face direct sun, specify UV-resistant inks or a UV-protective coating in addition to thickness. Our piece on UV protection for disability permits lists six ways to slow fading that apply to any long-life hang tag.
The spec list to send with every quote request
Most reprint problems trace back to a vague brief. Put these items in writing, and keep the approved sample on file.
- Material: coated paper, synthetic, laminated, polyethylene or PVC.
- Thickness and unit: for example 16 pt or 18 mil. Add GSM only as a second reference, never alone.
- Finished size: width and height after die cutting, plus corner radius.
- Hole and slot: diameter, position and whether it is reinforced.
- Finish: gloss, matte, UV coating or lamination, and whether you need to write on it with marker.
- Printing: one or two sides, colors, sequential numbering, barcode or QR code, logo placement.
- String or hanger: type, diameter and loop length.
- Durability target: how many months or years the permit must stay legible, and in what climate.
- Sample reference: a physical sample or approved proof that production must match.
If you buy permits for a new program, the sequence of decisions is covered in how to launch a parking garage permit hang tag program. The visual side, including numbering size and color coding, is in our parking hang tag design decisions.
Our perspective
We have been printing for parking operators since 1937, and the pattern is consistent: the permit that gets reprinted is rarely the one that was too expensive. It is the one that was specified by weight alone, or approved from a screen proof and never held in the hand.
Our advice is to start from the permit’s life, not from a price per thousand. Decide how long the tag has to stay readable, where it will hang and who will handle it. Then choose thickness, face and finish together. A tag that survives its full term costs less than a lighter tag replaced halfway through, once you count reissue labor, citations disputed by drivers and lost enforcement time.
We also recommend treating the physical sample as part of the contract. Record the thickness in points or mils, keep the approved piece, and reorder against it. That keeps tag number two hundred thousand feeling like tag number one, and it keeps your enforcement staff recognizing valid permits at a glance.
Richard
Order permit products from Caymil
Caymil Printing Co. manufactures custom parking products for operators, garages, hotels, casinos, hospitals, universities and municipalities, with sequential numbering, barcoding, logos, security features and custom colors. For adhesive permits that go directly on the glass, see our parking permit decals. If you need hang tag specifications for your site, tell us your permit term, climate and numbering needs, and we will help you match them to the right product.
You can also browse our full range of valet, parking and ticketing supplies at caymil.com.
Common mistakes when specifying thickness
- Comparing GSM to points. There is no universal conversion between the two, so compare like units only.
- Ordering by feel from a different stock. A coated and an uncoated sheet at the same caliper do not stiffen the same way. Match finish as well as thickness.
- Ignoring the hole. A thick tag with an unreinforced hole still tears at the mirror. Specify reinforcement for any permit that will be moved often.
- Skipping climate. A tag that works in a mild, dry region may warp in a hot, humid one. State the climate in the brief.
- Changing stock between runs without a new approval. Any change in supplier stock can change caliper. Approve a fresh sample each time.
FAQ
What is the standard thickness for a parking hang tag?
There is no single standard. Paper hang tags commonly run from about 14 to 24 point, and long-life permits move to synthetic or plastic. Government specs can be much more exact, such as the 0.023 inch polyethylene placard in the New Jersey request cited above. Choose by how long the permit must last.
Is 16 pt thick enough for a parking permit?
A 16 pt stock, about 0.016 inch thick, is sturdy enough for short-term visitor, event and temporary permits when it has a protective coating. For permits that stay on a mirror for a semester or longer, look at heavier cover stock, synthetic stock or plastic. Match the stock to the permit term and your climate.
Do points and mils mean the same thing?
Both express thickness in thousandths of an inch, so 12 point and 12 mil are both 0.012 inch. Printers say points for paper and card stock, and mils for plastic. Always include the unit when you write a spec.
How do I convert GSM to points?
You can’t convert reliably, because GSM measures weight and points measure thickness. Coating, fiber and finish change the relationship. Ask for the caliper of the proposed stock and compare it with a physical sample.
Should I choose plastic or paper hang tags?
Paper works for short-term and indoor permits. Plastic suits annual or multi-year permits and harsh sun or moisture. Decide by permit term first, then budget and print needs such as numbering and barcodes.
Sources
- Understanding Paper Weight, OKI Data Americas
- New Jersey Motor Vehicle Commission, RFQ for disability parking placards (2019)