Most hard hats have a working life of somewhere between six months and five years, depending on the brand, how the helmet is used, and how it's stored. 

Every hard hat sold in the UK carries a manufacture-date stamp that tells you exactly how yours measures up against that hard hat expiry date. 

If you're responsible for Personal Protective Equipment compliance on site, checking that stamp takes under a minute and is one of the simplest ways to close a genuine safety gap before it becomes an incident.

Why Hard Hats Expire Even Without Visible Damage?

A hard hat shell can look completely fine and still have failed. 

UV exposure breaks the plastic down at a molecular level. Heat cycling speeds up that breakdown too, whether it happens in a van, a site cabin, or direct summer sun. Repeated minor impacts play a part as well.Even ones that never crack the shell still fatigue the material underneath. 

None of this shows up as a visible crack or a colour change. The damage stays hidden until the helmet is already past reliable protection. 

That's why manufacturers set a hard hat expiry date from the manufacture date. They don't set it based on how the helmet looks.

How To Read The Expiry Date Stamp On Your Hard Hat

Flip the helmet over and look inside the brim. 

You'll find two small rings of numbers moulded or stamped into the plastic: the outer ring shows the month, the inner ring shows the year, with an arrow or marker pointing to the correct figures on each. 

That combination is the manufacture date, and it's what you use for a safety helmet expiry date check on that specific helmet, not the date you started using it, and not the date it was purchased. 

Some buyers search for this as a hard hat use by date or a safety hat expiry date; it's the same figure, just worked out from the same stamp. If the stamp has worn away or you can't read it clearly, treat the helmet as due for replacement rather than guessing.

What JSP And Centurion Actually Say About Replacement

Generic "hard hats expire after five years" advice is a starting point, not the full picture. The two brands you'll find across most UK sites publish their own guidance, and a JSP hard hat expiry date and a Centurion hard hat expiry date aren't calculated the same way.

JSP states a shelf life of up to five years in suitable storage conditions, but a much shorter working life once a helmet is in regular use, between six months and two years, depending on conditions. That's the guidance behind helmets like the JSP EVO2 Vented Safety Helmet and the JSP EVO3 Vented Safety Helmet, both stocked here.

Centurion's own wear and care guidance gives an in-use life of up to five years from the date the helmet is issued to the wearer, not from the manufacture date. This is the standard behind the Centurion Reflex Blue Safety Helmet, also in our range.

You'll find both brands across Tiger Supplies’ hard hats range.

The practical takeaway for a procurement team: check the guidance for the specific brand you've issued rather than relying on one blanket rule, and keep a record of issue dates alongside manufacture dates.

If you want to understand the EN 397 rating behind these helmets in more depth, our EN 397 Hard Hats Explained guide breaks down what the standard actually covers.

4 Signs Your Hard Hat Needs Replacing Sooner

A hard hat expiry date is the outer limit, not a guarantee the helmet is safe until that date arrives. Replace a helmet immediately, regardless of its stamped date, if you notice any of the following:

Cracking or crazing:

Any visible crack or fine surface crazing in the shell means the helmet has already failed and needs replacing straight away.

Chalky or faded texture:

A chalky, faded surface is a sign of UV degradation, even if the shell still looks structurally sound.

Any impact:

Even a minor knock can weaken the shell in ways you can't see, so treat any impact as a reason to replace it.

Damaged harness or liner:

A stretched, torn, or missing harness or liner is a common reason a helmet gets replaced well before its expiry date.

Building a replacement schedule for your team

The most reliable way to stay compliant across a workforce is to make date-checking part of your routine rather than something that only happens after an incident. Record each helmet's manufacture date and issue date at induction, set a review reminder in line with the manufacturer's guidance, and keep spares on hand so a helmet nearing its limit can be swapped out without downtime. 

Hard Hat ID Tags & Stickers are worth keeping in stock alongside replacement helmets,they make it easy to mark issue dates directly on the helmet for a quick visual check.

FAQs

What is the 5-year helmet rule?

There's no single universal "5-year rule," it's a commonly cited maximum shelf life, but actual in-use life is usually shorter and depends on the manufacturer. JSP recommends a shelf life of up to five years in storage but only six months to two years once a helmet is in regular use; Centurion states an in-use life of up to five years from the date of issue. Always check the guidance for the specific brand you're using rather than assuming five years applies across the board.

Do hard hats expire in the UK?

Yes. There's no single UK-wide legal hard hat expiry date UK regulation, but manufacturers stamp every hard hat with a manufacture date and set a recommended maximum shelf life and in-use life against it. Following that guidance is considered best practice for providing suitable head protection under UK PPE regulations, and it's the standard most HSE hard hat expiry date guidance points back to.

How do I read the expiration date on a hard hat?

Look inside the brim for two rings of numbers: the outer ring is the month, the inner ring is the year with an arrow pointing to the relevant figures on each. Together they show the manufacture date, which is the reference point for working out when the helmet is due for replacement.

Do hard hats have expiry dates?

Yes, in the sense that every manufacturer sets a recommended maximum lifespan from the date of manufacture. It isn't printed as a calendar expiration date for hard hats the way a food product might be, you calculate it from the stamped manufacture date using the guidance for that specific brand.

How long do Centurion hard hats last?

Centurion's official guidance gives an in-use life of up to five years from the date the helmet is issued to the wearer, assuming it's stored and used correctly and shows no signs of damage. Always check the individual product for confirmation before relying on this as a blanket figure.