What size does a HAZMAT placard have to be?

At least 250 mm (9.84 inches) on each side under 49 CFR 172.519, mounted diamond-fashion with one point up, with a solid inner border roughly 12.5 mm (0.5 inch) in from the edge. That is a floor, not a fixed figure — the industry-standard placard is 10.75 inches, which is what we cut. Going over the minimum is never the violation; going under it is.

Do I need placards for every load?

Only if the material and quantity meet the placarding threshold in 49 CFR Part 172. Some hazard classes require placarding at any quantity, others only above 1,001 lbs aggregate gross weight. Tell us what you haul and we will tell you what applies.

Can I use a magnetic placard instead of a permanent one?

Yes, and it is the practical choice if you carry different hazard classes on different loads — a placard holder lets you mount the correct diamond for each trip instead of a fixed one that is wrong half the time.

Where do placards go on the vehicle?

On each side and each end for most configurations, so the hazard class is visible from every direction of approach. The exact placement depends on whether you are running a straight truck, a tractor-trailer, or a bulk container.

What if my placard falls off during the trip?

A vehicle without a securely attached, legible placard is treated as unplacarded, which is a violation on its own. We mount for a firm, weather-rated hold, and magnetic holders should be checked at stops the same way you would check trailer lettering.

Do you cut UN identification number panels too?

Yes — where your load requires the four-digit UN number displayed alongside or on the placard, we cut that to spec at the same time.

How fast can I get a set?

Most sets are cut the same day at our Rolling Meadows, IL shop. If you are not local we ship anywhere in the US.

What does a placard set cost?

It depends on the hazard class, whether it is permanent or magnetic, and how many placards you need for your configuration. Call or text your hazard class and you will have a price in minutes.

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SERVICE · HAZMAT PLACARDS

HAZMAT Placards

A HAZMAT placard is the DOT diamond — exact size, exact color, exact hazard-class symbol — that federal law requires on a vehicle hauling regulated hazardous materials above the placarding threshold. We cut them to spec at our shop in Rolling Meadows, IL, in magnetic or permanent vinyl, most sets the same day, and ship anywhere in the US.

Call 224.400.0950 Get a quote

SHORT ANSWER

Tell us the hazard class or classes you haul and whether you need a permanent or magnetic set. We cut each placard in the standard 10.75 inch square-on-point diamond — comfortably past the 250 mm (9.84 inch) minimum set by 49 CFR 172.519 — in the exact color and symbol combination that class requires, and hand it over ready to mount. Most sets are ready the same day in Rolling Meadows, IL; we ship nationwide if you are not local.

What you get

The correct diamond for your hazard class — color, symbol and number all matched to the federal spec
Full 10.75 inch square, mounted point-up — past the 9.84 inch federal floor, in the required orientation
UN identification number panel where your load requires one
Choice of permanent vinyl or magnetic placard holders for a load that changes
Weather-rated material that stays legible in rain, road salt and direct sun
A full set for a straight truck, tractor and each side of a trailer, sized correctly
Placard holders if you run mixed loads and swap classes between hauls
A quick reference on which classes require placarding at what quantity

What the federal spec actually requires

HAZMAT placarding is one of the more exact rules in the federal code — 49 CFR Part 172, Subpart F sets specific dimensions and colors, not a general legibility test:

Size floor. At least 250 mm (9.84 inches) on each side, displayed diamond-fashion (square-on-point), with a solid inner border about 12.5 mm (0.5 inch) inside the edge. That is a minimum, not a fixed figure — the standard 10.75 inch placard we cut clears it.
Hazard class colors and symbols. Each of the nine hazard classes has a specific background color and symbol assigned by regulation — orange for explosives, red for flammable, green for non-flammable gas, and so on. You cannot substitute a similar color.
Placement. On each side and each end of the vehicle for most classes, so it is visible from every approach.
Threshold quantities. Placarding is required above specific quantity thresholds that vary by hazard class — some materials require it at any quantity, others only above 1,001 lbs aggregate gross weight.
Legible and secured. The placard must stay legible and firmly attached for the length of the trip — a placard that falls off in transit is treated as if it was never displayed.

Because the classes, thresholds and symbol combinations are specific and change with the load, we do not guess: tell us what you haul and we will cut the correct placard, not a close approximation. If you run different hazard classes on different loads, a magnetic placard holder lets you swap the right diamond in for each trip instead of ordering a new permanent set every time.

Straight from the source

How ordering works

1
Tell us your hazard class
Call, text or use the quote form with the hazard class or classes you haul, whether the load is placarded at any quantity, and whether you need permanent or magnetic.
2
We confirm the spec
We match the color, symbol and any UN number panel to the federal requirement for that class before anything is cut.
3
Cut to the standard diamond
Cut at the full 10.75 inch size, past the federal minimum, ready to mount square-on-point.
4
Pick up or ship
Most sets are ready the same day at the Rolling Meadows shop. Not local? We ship anywhere in the US.

Design it yourself Read the install guide

Usually ordered with it

US DOT number decals

The compliant number set for the power unit, ordered on the same visit as your placards.

Trailer lettering

Unit numbers and GVWR lettering alongside the required placards on a hazmat trailer.

Magnetic signs

Placard holders are the magnetic-mount version of this same idea, for loads that change class trip to trip.

Fleet apparel

DOT-compliant looking rig, DOT-compliant looking crew.

HAZMAT placard questions we get every day

What size does a HAZMAT placard have to be?: At least 250 mm (9.84 inches) on each side under 49 CFR 172.519, mounted diamond-fashion with one point up, with a solid inner border roughly 12.5 mm (0.5 inch) in from the edge. That is a floor, not a fixed figure — the industry-standard placard is 10.75 inches, which is what we cut. Going over the minimum is never the violation; going under it is.
Do I need placards for every load?: Only if the material and quantity meet the placarding threshold in 49 CFR Part 172. Some hazard classes require placarding at any quantity, others only above 1,001 lbs aggregate gross weight. Tell us what you haul and we will tell you what applies.
Can I use a magnetic placard instead of a permanent one?: Yes, and it is the practical choice if you carry different hazard classes on different loads — a placard holder lets you mount the correct diamond for each trip instead of a fixed one that is wrong half the time.
Where do placards go on the vehicle?: On each side and each end for most configurations, so the hazard class is visible from every direction of approach. The exact placement depends on whether you are running a straight truck, a tractor-trailer, or a bulk container.
What if my placard falls off during the trip?: A vehicle without a securely attached, legible placard is treated as unplacarded, which is a violation on its own. We mount for a firm, weather-rated hold, and magnetic holders should be checked at stops the same way you would check trailer lettering.
Do you cut UN identification number panels too?: Yes — where your load requires the four-digit UN number displayed alongside or on the placard, we cut that to spec at the same time.
How fast can I get a set?: Most sets are cut the same day at our Rolling Meadows, IL shop. If you are not local we ship anywhere in the US.
What does a placard set cost?: It depends on the hazard class, whether it is permanent or magnetic, and how many placards you need for your configuration. Call or text your hazard class and you will have a price in minutes.

Read up before you order

HAZMAT & PlacardsDo You Actually Need HAZMAT Placards? The 1,001-Pound Rule, Explained (2026)Most drivers who ask us for placards do not need them, and a few who never ask do. The answer turns on two tables in 49 CFR 172.504, one weight threshold, and a rule about towed trailers that almost nobody knows. Here is how to work out your own load.US DOT & MC GuidesUS DOT Decal Requirements, ExplainedWhat every owner-operator needs to know about US DOT and MC number decals — size, placement and staying compliant on the road.US DOT & MC GuidesNew Trucking Company? Your Decal & Lettering ChecklistJust got your authority? Here is everything that needs to go on the truck before your first load — and what to bring us to get it done in a day.

Get your HAZMAT placards cut today

Call or text your hazard class and whether you need permanent or magnetic — we will quote it in minutes. Mon–Fri 11 AM–5 PM in Rolling Meadows, IL, with nationwide shipping.

224.400.0950

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