Walk past any energized isolator on your site and you will see a lockout tag doing quiet, critical work. But what happens when that tag fades? The word “must” here does not mean a fixed calendar interval — no regulation sets a “replace every X months” rule. What the standard requires is that a tag stays durable and legible for as long as it is in use. The moment a tag becomes hard to read, it stops protecting anyone who approaches, and that is when it must be dealt with. This guide shows how to judge that moment.
Is there a fixed replacement interval? No. Neither OSHA’s control of hazardous energy standard (29 CFR 1910.147) nor ANSI’s lockout/tagout standard sets a calendar-based schedule for swapping tags. What they ask for is performance: a tagout device must be durable and remain legible for the full period it is exposed on the job.
What makes a tag “no longer usable”? When the information on it — who applied it, why the equipment is locked, when it went on, and the do-not-operate warning — can no longer be read at a glance by the people who need to see it. A faded, smeared, or washed-out tag no longer meets that test, and at that point it should be replaced rather than left in place. There is no magic date; the trigger is the loss of legibility.
Before deciding whether a tag can stay, it helps to remember what the tag is for. A lockout tag is a warning device, not a physical restraint — the lock does the restraining. The tag’s job is to tell anyone approaching the equipment the essentials of the control in place. You can read more about the role of this device in our post on the purpose of a lockout tagout device.
At minimum, a readable tag should communicate:
If any of these fields has faded to the point that a shift supervisor or contractor cannot read it quickly, the tag is no longer doing its job. That is the practical definition of an illegible lockout tag — and the reason legibility, not age, is the real replacement trigger.
Tags fail in predictable ways, and most trace back to the environment they live in. Knowing your site’s exposure is the first step to choosing a tag that lasts:
Material choice matters too. Cardstock tags are economical for dry indoor use but fade and soften faster outdoors, while PVC and polyester tags resist water and many chemicals better. When you weigh lockout tag material PVC vs cardstock, match the substrate to the exact environment rather than buying one type for the whole site. That single decision often answers the question of how long do lockout tags last in your specific conditions.
OSHA’s control of hazardous energy standard sets the benchmark most US sites follow. Under 29 CFR 1910.147(c)(5)(ii)(A), lockout and tagout devices are required to be durable — capable of withstanding the environment they are exposed to for the expected period — and tagout devices must be constructed and printed so that weather, wet, and damp conditions do not cause the tag to deteriorate or the message to become illegible. The same clause also addresses corrosive environments such as areas where acids and alkalis are handled.
Two points matter for your lockout tag durability requirements. First, the requirement is framed around performance and exposure, not a time limit. A tag that survives two weeks outdoors but is unreadable by week three has not met the standard for its use. Second, the rules also call for tags to be standardized in print and format (1910.147(c)(5)(ii)(B)) and to carry the identity of the employee who applied them (1910.147(c)(5)(ii)(D)). Many North American sites also reference ANSI/ASSE Z244.1 as a complementary standard. For a look at how weak controls surface in audits, see our overview of common OSHA LOTO citations.
| What you see on the tag | What to do next |
|---|---|
| Print is light but every field is still readable | Monitor and note it in the next inspection; consider earlier replacement if the tag is outdoors or in washdown. |
| Date, name, or reason partially unreadable | Replace at the next safe opportunity; never leave the isolation point unmarked during the swap. |
| Do-not-operate legend faded or incomplete | Treat as unusable; replace before anyone works the equipment. |
| Substrate warped, torn, or discoloured by chemicals | Replace and review the material choice for that area (PVC or polyester over cardstock). |
| Writing smeared or marker has bled | Re-mark on a fresh tag; review the marker type used on site. |
| Attachment tie degraded or loose | Refit the tie; keep the tag in place until the new tie is secured (the lock remains). |
Quick Tag Legibility Self-Check
Walk through these five questions for any tag on an active or stored lockout. If you answer “no” to any, the tag likely needs attention.
If “Do Not Operate / Start / Energize” is faded or incomplete, treat the tag as unusable and replace it before work begins. The legend is the core warning.
The employee name or ID must be legible so a coworker knows who to ask. If it has faded, the tag fails the identification requirement.
A faded date or reason makes it hard to tell how long the equipment has been out and why. Replace if either is unclear.
No warp, tear, or chemical stain that hides print. Damage to the base material shortens tag life in harsh areas.
A loose or degraded tie can drop the tag entirely. Refit before the tag is lost, keeping the lock in place throughout.
The hardest case is a tag on a live lockout — equipment still isolated, energy still controlled. The priority is simple: the isolation point must never be left without a clear warning. The same logic behind who is allowed to remove a lockout tag applies here — control stays with the authorized employee.
A few principles keep the swap safe:
This is a principle-level description, not a step-by-step manual. Your facility’s documented procedure is the authority, and it should always be followed.
Tag condition should not be a once-a-year afterthought. Two checkpoints work well:
A simple checklist can capture: is the print legible, are all fields filled, is the legend intact, is the substrate sound, and is the attachment tie secure? Fold this into your existing program rather than treating it separately. Our LOTO audit checklist outlines what industrial sites typically inspect.
Several habits quietly undermine tag legibility:
If your program shows several of these, it may be time to review the wider setup — our guide on signs your LOTO program needs an update covers the patterns to watch.
No fixed schedule exists in the standards. Replacement is condition-based: when a tag is no longer durable and legible for its exposure, it should be swapped. Many sites set their own internal trigger, such as at each periodic inspection or as soon as a field becomes unreadable.
Anything that stops the message from being read at a glance — faded print, smeared writing, washed-out colour, torn or warped substrate, or a missing do-not-operate legend. If a supervisor or contractor cannot read who, why, when, and the warning, the tag is illegible.
It is generally better to replace it. Writing over faded print usually produces a double, smeared image that is harder to read, not easier. A fresh, fully filled tag restores clear communication and avoids confusion during the job.
Typically the authorized employee who applied it, or another person acting under the site’s written energy control procedure. The swap should follow the same control as removal, and the isolation point should never be left unmarked. Your facility procedure decides the exact rule.
If they are used in those conditions, yes. The standard expects tagout devices to be constructed and printed so that weather, wet, and damp exposure — and corrosive environments — do not make them deteriorate or become illegible. Choose materials and printing suited to the actual environment.
The lock still provides the physical restraint, so the isolation is not removed by a faded tag. But the tag is the communication layer: a faded tag weakens the warning and can confuse workers or contractors, which is why it should be addressed rather than ignored.
Add tag legibility and attachment condition to the periodic energy control inspection and to pre-job checks. Confirm the print is readable, all fields are complete, the legend is intact, the substrate is sound, and the tie is secure. Document findings as part of the existing audit.
A faded lockout tag is easy to overlook on a busy site, but it is also easy to get right. No calendar date forces a swap — the standard expects a tag to stay durable and legible for as long as it is in use, and to be replaced the moment it is not. Build a quick legibility check into your pre-job and periodic inspections, choose materials suited to the environment, and keep control with the authorized employee during any swap. Your business protects people through consistent, documented habits, not perfect weather.
| Fighting faded or hard-to-read tags on site? Tell Prolockey where the tags are used (outdoor, washdown, chemical, heat) and how you mark them today, and we can suggest tag material, thickness and printing options. |
Prolockey provides lockout tagout devices; employers are responsible for establishing and implementing site-specific energy control procedures.
