Is the Master Lock 410GRN the right lockout/tagout padlock for a color-coded green-crew or general-industry LOTO program?

Short answer: Yes, if you want an instantly recognizable, budget-friendly green safety padlock for color-coded personal energy isolation under OSHA 1910.147. The 410GRN's draw is Master Lock brand recognition on a lockout padlock, not premium spec — choose it when you assign green to a trade or department and value universal familiarity over the lighter aluminum bodies elsewhere in our lockout/tagout range. If you need electrical-rated dielectric bodies, look at the ABUS 74/40 non-conductive pack instead.

Master Lock 410GRN Lockout Tagout Padlock — Green Review (2026)

In a lockout/tagout program, the 410GRN does one job: hold an energy-isolating device — a breaker, valve, or disconnect — in the safe position so equipment cannot be re-energized while a worker is exposed. That role sits at the center of how to perform LOTO and is the reason OSHA 1910.147 demands lockout devices be durable, standardized, substantial, and identifiable. The 410GRN earns its place in a color-coded program: green is assigned to a specific trade, environmental crew, or department, and because Master Lock is the most widely recognized padlock brand in North America, any worker on a mixed or rotating contractor crew immediately reads it as a safety padlock rather than a personal lock. It is a personal-protection device, not a security lock — pair it with a lockout tag that names the worker, and where one isolation point must hold multiple workers, add a hasp from our lockout hasps range. If you are still mapping out your program, start with what is lockout/tagout and how to choose a lockout padlock.

Editorial verdict — 4.1/5
For the price, the 410GRN buys you the single most recognizable safety-padlock brand in a compliant green color — a strong value for general-industry programs, provided you do not need an aluminum or non-conductive body.VIEW ON WC SAFETY →CHECK PRICE ON AMAZON →

As an Amazon Associate, WC Safety earns from qualifying purchases. Prices and availability are accurate as of the date shown and are subject to change. Full affiliate disclosure.

Who it is for

• Maintenance technicians who need a recognizable personal lock and follow how to perform LOTO at breakers, valves, and disconnects
• Facilities and plant teams running a color-coded program who assign green to a department or environmental crew across the lockout/tagout range
• Safety managers standardizing on a known brand for mixed workforces, building from how to choose a lockout padlock
• Contractors and rotating crews who benefit from a lock any worker instantly identifies as a safety padlock
• Buyers who want brand familiarity over the lighter aluminum Brady SafeKey blue or American Lock A1107R

What the Master Lock 410GRN does well

Brand recognition that does compliance work

OSHA 1910.147 wants lockout devices that are identifiable. Because Master Lock is the most recognized padlock brand in North American industry, the 410GRN is read as a safety lock on sight — a genuine benefit on sites with rotating contractors who do not know your specific lockout padlocks.

Built only for LOTO

The 410GRN is non-rekeyable and safety-specific — it exists for personal energy control, not general security. That single-purpose design keeps it from drifting into toolbox or gate duty, which is exactly what what is lockout/tagout asks of a dedicated device.

Color-coding that fits a real program

Green is a clean assignment for a specific trade, department, or environmental/maintenance crew. Used alongside the yellow and red options in our lockout/tagout lineup, it lets a facility tell crews apart at a glance on a shared lockout hasp.

Budget-friendly standardization

Priced for cost-conscious programs and universally available, the 410GRN is easy to standardize on and easy to replace, which matters more for sustained compliance than a premium spec sheet. Stage spares in a lockout station so a lost lock never stalls a lockout.

Where the Master Lock 410GRN falls short

Steel means weight

The 410GRN uses a steel body, heavier than the aluminum padlocks in our range. Over a full shift on a tool belt that weight is noticeable, and crews who prioritize carry comfort often prefer the aluminum Brady SafeKey purple or ABUS 2ALHB/40-75.

Not a non-conductive lock

Steel is conductive. The listing makes no dielectric claim, so the 410GRN is not the lock for electrical isolation that requires a non-conductive body — for that, the thermoplastic ABUS 74/40 is the better-suited choice.

Sold as a single, not a pack

This is one padlock, not an economy bundle. Equipping a whole crew costs more per worker than the TRADESAFE 10-pack red or yellow 10-pack.

Unpublished shackle dimensions

The listing does not state shackle length or clearance, so confirm it spans your hasps before you standardize — review how to choose a lockout padlock for what to measure.

Master Lock 410GRN vs the competition

Compare prices on Amazon →Master Lock 410GRN on Amazon[American Lock A1107R]

When to step up from the Master Lock 410GRN

If weight or electrical use is a factor, step up from the steel 410GRN to an aluminum or non-conductive body. The aluminum Brady SafeKey keyed-different is lighter for all-day carry, while the thermoplastic ABUS 74/40 pack is the move where electrical isolation needs a non-conductive lock. If you are equipping a whole crew rather than one worker, the economy TRADESAFE yellow 10-pack lowers your per-head cost. And if a single isolation point sometimes has to be too long for a standard shackle, the long-shackle ABUS 2ALHB/40-75 reaches through deeper and stacked lockout hasps.

Category context

A LOTO program is built from a few device types, and choosing among them matters more than brand. A padlock like the 410GRN holds one isolation point for one worker; a hasp from our lockout hasps range lets several workers each apply their own lock to the same point for group lockout; a cable lockout reaches valve wheels and oversized geometry a rigid hasp cannot span; a personal kit and lockout stations stage and carry the devices. Keying is the next decision: keyed-different (KD) gives every lock a unique key — the default for per-worker control under OSHA 1910.147 — while keyed-alike (KA), as on the ABUS 2ALHB/40-75, lets one key open a matched set for a single worker holding multiple points. The 410GRN is a personal-lockout padlock, and the worker's identity is carried by a lockout tag — remember a tag identifies the worker but is never itself an energy-isolating device, as lockout vs tagout explains.

Total cost of ownership

On total cost, the 410GRN's strength is brand and price, not pack economics. As a single padlock it costs more per worker than the economy TRADESAFE red 10-pack or ABUS 74/40 pack, so for full-crew rollouts the math favors a bundle. Where it earns its keep is durability and replacement: a steel body is a known, standard-duty construction, and Master Lock's universal availability means a lost or retired lock is trivially re-bought without re-standardizing your lockout padlocks. Buy enough green units to cover the assigned crew plus spares staged in a lockout station, and budget for the lock plus a matching lockout tag per worker — the tag is part of every compliant application, not an optional add-on.

Final verdict

Choose the Master Lock 410GRN when you run a color-coded program, assign green to a trade or department, and want the most recognizable safety padlock brand on a budget — it is a reliable standard-duty pick for general industry under how to perform LOTO. Skip it if weight matters all shift (go aluminum: Brady SafeKey blue), if you need a non-conductive lock for electrical isolation (the ABUS 74/40), or if you are equipping a whole crew at once (the TRADESAFE yellow 10-pack). For the full device map, start at what is lockout/tagout and browse the complete lockout/tagout range.

VIEW ON WC SAFETY →CHECK PRICE ON AMAZON →

Master Lock 410GRN FAQ

Is the Master Lock 410GRN OSHA 1910.147 compliant?

Yes. The 410GRN is a non-rekeyable, safety-specific padlock built for personal energy control under OSHA 29 CFR 1910.147, which requires lockout devices to be durable, standardized, substantial, and identifiable. Used correctly — one worker, one lock, one key, applied to an isolated energy source — it satisfies the personal-protection role described in what is lockout/tagout. Compliance ultimately depends on your written procedure, not the lock alone.

What does the green color mean on a lockout padlock?

Color in LOTO is a program assignment, not a fixed standard, and green is commonly assigned to a specific trade, department, or environmental/maintenance crew. The point is identifiability: a glance at the lock tells you whose crew owns the lockout. See how to choose a lockout padlock for setting up a color scheme across your lockout padlocks.

Is the 410GRN keyed different or keyed alike?

The listing identifies it as a safety, non-rekeyable padlock but does not state a fixed keying configuration, so confirm KD vs KA at purchase. For per-worker personal control, you want keyed different (KD) so each worker holds the only key to their own lock. If one worker needs one key for many points, keyed alike — like the ABUS 2ALHB/40-75 — is the pattern instead.

Is the Master Lock 410GRN non-conductive or dielectric?

No. The 410GRN has a steel body, and steel is conductive — the listing makes no dielectric claim, so do not treat it as a non-conductive lock. For electrical isolation that requires a non-conductive body, choose a thermoplastic padlock such as the ABUS 74/40 or an aluminum SafeKey from our lockout padlocks range.

How does the 410GRN compare to an aluminum lockout padlock?

The main difference is weight: the 410GRN's steel body is heavier than aluminum padlocks like the Brady SafeKey blue or keyed-different SafeKey. The 410GRN counters with stronger brand recognition and budget pricing. Pick steel for familiarity and cost, aluminum for all-day carry comfort.

Can one 410GRN lock out a point shared by several workers?

No — a single padlock holds one isolation point for one worker. When multiple workers service the same point, each applies their own lock to a hasp, which is group lockout. Add a device from our lockout hasps range and review how to perform LOTO for the group sequence.

Do I still need a tag if I use the 410GRN?

Yes. The padlock isolates energy; the tag identifies the worker and warns others not to operate the equipment. A tag is never an energy-isolating device on its own — lockout vs tagout explains the distinction. Pair each 410GRN with a lockout tag.

Is the 410GRN sold as a multi-pack?

It is sold as a single padlock, not an economy bundle. To equip a full crew at a lower per-worker cost, a 10-pack like the TRADESAFE red set or ABUS 74/40 pack is more economical. Buy singles like the 410GRN when you need a specific color for a small group.

What shackle length does the 410GRN have?

The listing does not publish shackle length or clearance, so measure your hasps and confirm fit before standardizing on it. If you regularly lock through deep or stacked hasps, a long-shackle lock such as the ABUS 2ALHB/40-75 is purpose-built for that reach. See how to choose a lockout padlock.

Why choose Master Lock over a cheaper off-brand safety padlock?

The 410GRN's case is identifiability: Master Lock is the most recognized padlock brand in North America, so even unfamiliar contractors read it as a safety lock on sight, which supports the OSHA 1910.147 requirement that devices be identifiable. On a mixed or rotating workforce that recognition has real value. Browse the full lockout/tagout range to compare.

Can the 410GRN be rekeyed or used as a general padlock?

No. It is a non-rekeyable, safety-specific lock designed exclusively for LOTO personal-protection use, which keeps it from drifting into toolbox, gate, or locker duty. That single-purpose design is a feature, not a limitation — it is what what is lockout/tagout expects of a dedicated energy-control device.

Is the 410GRN good for electricians working on energized-adjacent panels?

Only with caution. It is a steel-body lock and not dielectric-rated, so for electrical isolation that calls for a non-conductive lock, choose a thermoplastic or aluminum body such as the ABUS 74/40 or a SafeKey aluminum. The 410GRN is better suited to general mechanical isolation.

How many 410GRN locks should I buy per worker?

At minimum one lock per worker per isolation point they control simultaneously, plus spares staged in a lockout station. Workers locking multiple points at once need multiple locks. Plan around your procedure in how to perform LOTO rather than buying one lock per head and stopping there.

Does the 410GRN work with standard lockout hasps?

In general a standard safety padlock fits standard hasp eyes, but because the 410GRN's shackle dimensions are not published, confirm clearance against your specific lockout hasps before committing. For group lockout the hasp, not the lock, sets how many workers can attach — see how to perform LOTO.

What's the difference between the 410GRN and the American Lock A1107R?

Both are single-purpose steel-bodied safety padlocks, so they are close in role; the headline difference is color assignment (green vs red) and brand family. Read the American Lock A1107R review to compare, then assign each color to a crew in your program.

Is the 410GRN a good value for a small maintenance shop?

Yes — for a small shop assigning green to a crew or department, the 410GRN delivers a recognized brand at a budget price without committing to a 10-pack. If headcount grows, step up to an economy bundle like the TRADESAFE yellow 10-pack. Start your kit from the lockout/tagout collection.

Where does the 410GRN fit in a complete LOTO program?

It is the personal padlock layer — the device that holds one isolated point for one worker. Around it you stage tags, hasps for group lockout, cable locks for odd geometry, and a station to store it all; browse lockout stations, cable lockouts, and lockout tags to round out the program described in what is lockout/tagout.