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What Do the Markings and Symbols Inside Hard Hats Mean?

What Do the Markings and Symbols Inside Hard Hats Mean?

A field guide to ANSI labels, type and class stamps, and date codes printed inside every compliant hard hat

Flip any hard hat over and look at the underside of the brim or the inside of the shell. You'll find a cluster of small stamps and symbols that most crews never think about until an inspector asks about them. Those marks tell you who made the hat, which ANSI Z89.1 standard it meets, whether it's rated for top impact or lateral impact, what electrical class it falls under, and how old the shell actually is. Knowing how to read hard hat markings takes about two minutes and can save your crew from wearing out-of-spec or expired PPE on a jobsite.

Common Questions About Hard Hat Markings

What is the OSHA rule for hard hats?
OSHA doesn't write its own testing standard for hard hats. Instead, 29 CFR 1926.100 requires that head protection meet ANSI/ISEA Z89.1, the industry consensus standard covering impact resistance, penetration resistance, and electrical protection. If a hard hat carries a legitimate ANSI Z89.1 stamp inside the shell, it satisfies OSHA's requirement for that class and type of work.
How to tell if a hard hat is OSHA approved?
There's no OSHA approval stamp because OSHA doesn't certify individual products. Instead, check the inside of the shell for the manufacturer name, the ANSI/ISEA Z89.1 designation, the type (I or II), and the class (E, G, or C). If all four are present and legible, the hat meets the standard OSHA references in 1926.100.
How to tell if a hard hat is Type 2?
Look for a small "Type II" stamp near the ANSI Z89.1 marking inside the shell. Type II hard hats are built to reduce force from lateral (side) impacts in addition to top impacts, which is why they typically have a thicker shell and a more substantial suspension system than a standard Type I hat. You can compare the two categories on our page covering Type I and Type II hard hat standards.
How do I tell how old my hard hat is?
Look inside the shell or under the brim for a small clock-face or calendar symbol with an arrow. The arrow points to the quarter and year the shell was manufactured. Most manufacturers recommend replacing a shell five years from that manufacturing date regardless of visible wear, and sooner if it's been dropped, exposed to chemicals, or left in direct sun for long stretches.
Can I still see the ANSI markings after a hard hat is custom printed?
Yes. Custom printing is applied to the exterior of the shell, typically the front, back, or sides. The manufacturer's required ANSI Z89.1 label, type/class stamp, and date code stay intact on the interior or underside of the brim where they were originally molded or stamped. Custom decoration never covers or removes those compliance marks.
Do all hard hats sold on CustomHardhats.com carry ANSI markings?
The hard hat shells we print on, including our Honeywell Fibre-Metal climbing-style helmets and the MSA Skullgard full brim, ship with the manufacturer's factory ANSI Z89.1 markings already molded into the shell. We add your logo or crew name on top of a compliant shell; we don't alter or reprint the safety labeling.
What's the difference between a Class E, G, and C marking?
Class E (electrical) hats are tested to withstand up to 20,000 volts and are the standard choice for utility and high-voltage line work. Class G (general) hats are tested to 2,200 volts and cover most general construction. Class C (conductive) hats offer no electrical protection at all and are typically used where impact protection is needed but there's no electrical hazard, such as certain manufacturing environments.

Reading the ANSI Z89.1 Label Inside Your Shell

Every compliant hard hat carries a small label or stamp on the inside of the shell, usually near the brim or crown. That label is where the real information lives. At minimum it should show the manufacturer's name, the standard number (ANSI/ISEA Z89.1 followed by the applicable year), the type designation (I or II), the class designation (E, G, or C), the head size range, and the manufacturing date code. If any of those elements are missing, worn off, or were never molded into the shell in the first place, treat the hat as non-compliant and pull it from service. This is also why aftermarket paint, heavy solvents, or adhesive removers should never be used near the interior label. If you're outfitting a crew and want a refresher on how these standards map to job type, our guide on hard hat types and classes breaks it down further.

Type I vs Type II Hard Hat Markings

The "Type" stamp tells you what kind of impact the shell is built to absorb. Type I hard hats are designed to reduce the force of a blow to the top of the head, which covers the majority of falling-object scenarios on a standard construction site. Type II hard hats add lateral, or side, impact protection, which matters in confined spaces, scaffolding, and climbing work where a worker is more likely to strike the side of the helmet against a fixed object. Type II shells generally have a deeper profile and a dual-suspension system to spread that lateral force. Crews doing structural steel, tower work, or confined-space entry often standardize on Type II for this reason, such as the Honeywell Fibre-Metal climbing style Type II helmet. For a side-by-side breakdown of what each type protects against, see our pages on Type I hard hat standards and Type II hard hat standards.

Class E, Class G, and Class C Markings Explained

The class marking tells you how much electrical protection a shell offers, and it's stamped right next to the type designation. Class E hard hats are tested to 20,000 volts and are built for electrical linework, substations, and any job where high-voltage exposure is a real risk. Class G hard hats are tested to 2,200 volts and cover most general construction, roofing, and trade work where some electrical protection is important but extreme voltage isn't expected. Class C hard hats provide no electrical protection at all; they're chosen when a lighter, often vented shell is preferred and electrical hazards aren't present. Matching the class marking to your actual jobsite conditions matters more than picking a hat based on style or color. Our category pages for Class E hard hats, Class G hard hats, and Class C hard hats show which shells fall into each rating before you customize them.

How to Read a Hard Hat Date Code

Underneath the brim or molded into the crown, most manufacturers include a small clock or calendar-style symbol with an arrow pointing to a number around the outer ring. That arrow indicates the quarter and year the shell was manufactured, often paired with a dot or notch marking the exact quarter. This is different from an expiration date because ANSI doesn't set a universal hard hat expiration date. Instead, manufacturers publish their own service-life recommendations, and five years from the manufacturing date is the most common benchmark for shell replacement, with suspensions typically swapped out every 12 months regardless. If your crew is unsure how to interpret the date code on a specific brand, our page on selecting the right hard hat covers manufacturer-specific guidance and what to check before an order goes out.

Hard Hat Type and Class Markings at a Glance

Use this chart to quickly match the stamp inside a shell to what it actually protects against.

MarkingWhat It MeansProtection TypeTypical Use Case
Type ITop impact reductionVertical impact onlyGeneral construction, general contractors
Type IITop and lateral impact reductionVertical and side impactClimbing, confined space, structural steel
Class ETested to 20,000 voltsHigh-voltage electricalUtility crews, linework, substations
Class GTested to 2,200 voltsGeneral electricalGeneral construction, roofing, plumbing
Class CNo electrical ratingImpact only, conductive shellNon-electrical environments, vented shells
Date code (clock symbol)Quarter and year of manufactureN/ADetermines shell service-life replacement schedule

Custom Hard Hats in Every Color, Ready to Brand

These are the same ANSI-marked shells our team prints on. The manufacturer's type, class, and date stamps stay untouched inside the hat; only the exterior gets your logo, crew name, or full-color design.
ERB Americana Standard

ERB 19366 Americana Standard Hard Hats - Custom Blue Hard Hat

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MSA V-Gard

MSA, 10242629 V-Gard H2 Safety Helmet, Type II, Ratchet Suspension, Vented - Custom White Hard Hat

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ERB Omega II Standard

ERB 19139 Omega II Standard Hard Hats - Custom Black Hard Hats

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MSA Skullgard

MSA 475407 Skullgard Full Brim - Natural Tan Hard Hat

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Order Compliant, Custom-Branded Hard Hats for Your Crew

Every shell we print starts as a factory-certified hat with its ANSI Z89.1 markings, type, class, and date code fully intact. We add your logo, crew names, or full-color design on top, so your team stays branded and compliant. Browse hard hat types and classes to find the right shell before you customize.

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