A lockout program is only as lockable as its hardware. The right devices — the correct breaker lock for the actual panel, a valve clamp that fits the actual valve, a hasp when two techs share one disconnect — are what turn a written procedure into physical protection. The wrong devices, or too few of them, quietly push workers toward tag-only shortcuts.
This guide inventories the hardware families, the OSHA rules every device must meet, and how to choose and standardize a kit that fits your plant.
What counts as a lockout/tagout device
OSHA divides the world into energy-isolating devices (the disconnect switch, breaker, valve, or plug that actually stops energy) and lockout/tagout devices (the lock, tag, hasp, or adapter that holds the isolating device in the safe position). Your procedures name the first; your hardware crib stocks the second.
Every lockout/tagout device must be durable, standardized by color, shape, or size, substantial enough to prevent removal without excessive force, and identifiable as belonging to the employee who applied it. Locks and tags are for energy control only — never for toolboxes, gates, or lockers.
| Hardware | What it does | When you need it |
|---|---|---|
| Lockout padlock | Physically holds an isolating device in the safe position | Every isolation point, every lockout |
| Tag | Warns who applied the device and why it must not be operated | With every lock; alone only where a lock cannot fit |
| Hasp | Multi-lock adapter letting several workers lock one point | Two-person jobs and small crews |
| Group lockbox | Holds equipment-lock keys; each worker adds a personal lock | Multi-craft and multi-shift jobs |
| Device-specific lockout | Fits breakers, valves, plugs, cables to make them lockable | Wherever the isolating device has no built-in lock provision |
Locks: the core of the program
Each authorized employee gets their own lock — and only they hold its key. Keyed-different locks (one unique key per lock) are the standard for personal protection because no two employees share access. Keyed-alike sets (one key opens a group of locks) suit team kits and lock stations where quick equipping matters, but every worker still applies and removes only their own lock.
Choose dedicated safety padlocks — non-conductive bodies for electrical areas, anodized aluminum or steel for harsh environments — in a plant-standard color. Never use personal or combination locks: the key control and identifiability rules fail immediately.
Tags, hasps, and lock stations
Tags identify who applied the device and why. They must use a standard print and format, warn against operation (Do Not Operate, Do Not Start), attach with a non-reusable tie that withstands the environment, and survive long enough to outlast the job.
Hasps solve the shared-disconnect problem: a folding metal adapter through one isolation point with room for up to six personal locks. Nobody can re-energize until the last lock comes off. Lock stations — the wall board or cabinet holding locks, tags, hasps, and device kits for a department — keep everything standardized and within reach instead of scattered across toolboxes.
Device-specific lockouts: breakers, valves, plugs, cables
Most real plants need adapters because most isolating devices were not built lock-ready. Stock the families your energy inventory actually contains:
- Breaker lockouts — clamp-on or pin-type adapters for single and multi-pole breakers in the panels you actually have
- Ball-valve and gate-valve lockouts — sized to your valve handles; measure before ordering
- Plug lockouts — boxes that enclose the plug so equipment cannot be reconnected during service
- Cable lockouts — adjustable cables threading through multiple valves, handles, or disconnects on one machine
- Pneumatic and push-button covers — for air quick-disconnects and control stations that invite accidental operation
Wrong-size valve lock? Follow Tegis on Google for hardware sizing guides.
How to choose and standardize
Walk the plant before buying: list every isolation point type across your machine-specific procedures, note the odd sizes, and kit each department for its actual equipment — not a generic catalog bundle. Standardize one lock color per site (or per craft), one tag format plant-wide, and one station layout everywhere so a transferred tech is never re-learning the system.
Buy for the failure modes: spare locks so nobody ever waits (waiting breeds skipping), spare hasps so pairs never share, and weather-rated tags and ties for washdown and outdoor areas. The cheapest hardware program is the one complete enough that the shortcut never looks tempting.
Device rules that become citations
Hardware discipline is where inspectors find easy violations. Enforce the non-negotiables: one lock per exposed worker, locks removed only by the employee who applied them (except the documented emergency-removal procedure), tags never removed or bypassed by anyone else, and devices used for energy control only.
For multi-worker jobs, the group lockbox plus personal locks is the standard method — a single supervisor lock covering a crew is one of the fastest routes to a willful citation.
Key takeaways
- Stock the procedure, not the catalog: buy adapters sized to your actual breakers, valves, and plugs.
- Keyed-different for personal locks; keyed-alike only for team equipping — one lock per worker either way.
- Standardize color, tag format, and station layout plant-wide so every tech works one system.
- Hasps cover small shared jobs; the group lockbox covers crews, contractors, and shift work.
- Devices are energy-control only, removed only by their owner — enforce both without exceptions.
Frequently asked questions
Keyed alike vs keyed different — which for LOTO?
Keyed-different (unique key per lock) is the standard for personal lockout locks because each employee controls only their own lock. Keyed-alike sets help equip a team quickly, but every worker still applies and removes only their own lock — shared keys never substitute for personal locks.
Can a tag be used instead of a lock?
Only where the isolating device cannot accept a lock — and then only with extra protections and the six mandatory tag-limitation training topics. Wherever a lock can physically be applied, OSHA requires lockout.
What must LOTO devices meet under OSHA?
Durable, standardized, substantial, and identifiable: they must survive the environment, use one recognizable format, resist removal without excessive force or tools, and identify the employee who applied them. And they may be used for energy control only.
How many locks and hasps should a department stock?
Enough that no worker ever waits or shares: one personal lock (plus a spare) per authorized employee, hasps wherever two or more techs share a disconnect, a group lockbox for crew jobs, and device-specific adapters sized to every isolation point in the department procedures — plus spares.