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Master Lock 421 Lockout Tagout Hasp with Vinyl-Coated Handle and Extended Jaw, Red, 1-1/2
$7.15
Final price set by Amazon · may vary
Short answer: the master lock 421 lockout tagout hasp with vinyl-coated is covered below on the specifications its own listing publishes, the standards it is certified to, and who it suits. EDITORIAL REVIEW: 4.6/5 -...
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Built for Industrial BuyersResearch written for safety managers, procurement teams, and field supervisors.
Short answer: the master lock 421 lockout tagout hasp with vinyl-coated is covered below on the specifications its own listing publishes, the standards it is certified to, and who it suits.
EDITORIAL REVIEW: 4.6/5 - WC Safety review of the Master Lock Lockout Hasp, a group-lockout hasp.
Editorial assessment by Steven Eaton, WC Safety editor, based on the published Master Lock listing and OSHA 29 CFR 1910.147. We did not laboratory-test this product.
Editorial assessment by Steven Eaton, WC Safety editor, based on the published Master Lock listing and OSHA 29 CFR 1910.147. We did not laboratory-test this product.
A lockout hasp lets several workers each apply their own padlock to one energy-isolation point, so equipment stays locked until the last person finishes. It is the core group-lockout device in any lockout/tagout program, escalating a single-lock isolation into a multi-worker one.
Listed as "Master Lock 421 Lockout Tagout Hasp with Vinyl-Coated Handle and Extended Jaw, Red, 1-1/2" - key details from the manufacturer listing:
- Master Lock 421 Lockout Tagout Hasp with Vinyl-Coated Handle and Extended Jaw
- 1-1/2 in Jaw
Secure each hasp with keyed-different lockout padlocks and keep a stocked lockout stations at the point of use so the right devices are always on hand.
master lock 421 lockout tagout hasp with vinyl-coated — what the listing actually specifies
What to check before you buy
A sign warns; it does not control. Signage is the lowest tier of protection and works only when the hazard it names is already being managed some other way. 29 CFR 1910.145 sets the design and wording rules for accident-prevention signs and tags. Place them where the decision is made, keep the wording specific, and remove them once the hazard is gone so the remaining signs still mean something.
- One lock, one key, one worker
- Under OSHA 1910.147 each authorized employee applies their own lock, and only that employee removes it. Shared or master-keyed locks defeat the purpose.
- Devices must be durable and identifiable
- Lockout devices have to withstand the environment they are used in and must identify the worker who applied them. A padlock with no identification does not meet the standard.
- Verify the isolation
- Applying the device is not the end. The standard requires verifying that the energy has actually been isolated and dissipated before work begins.
- Stored energy counts
- Springs, hydraulic and pneumatic pressure, capacitors, elevated components and thermal energy all have to be released or restrained, not just the electrical supply.
More from our Lockout Hasp reviews
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Related categories on this site: Lockout Hasps.
Written by Steven Eaton, WC Safety editor. WC Safety is an independent PPE review site, holds no inventory and sells nothing directly; Amazon links are affiliate links that earn a commission at no cost to you and never affect the assessment. This page is not medical, legal or regulatory advice.
These cover the questions this page does not: best safety glasses 2026, best safety glasses for construction workers, best safety glasses for electricians, best safety glasses for healthcare workers.
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The rest of the range sits in clear lens safety glasses, dewalt safety glasses.
Where this sits against the alternatives
Comparable options and the trade-offs between them are set out in the category guides linked below; this listing is one option within that range, not a category verdict.
How this page is put together
Specifications come from the manufacturer’s own published listing for this model, and any standard named here is quoted from its published text. WC Safety runs no laboratory and performs no testing; where an attribute is not published, this page says so rather than estimating it.
Brand / Vendor
Master Lock
Model / SKU
—
Product Type
Lockout Hasp
Price
$7.15 (Amazon)
Availability
Check current availability on Amazon
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Coverage focuses on equipment built for professional use in manufacturing, construction, and industrial environments.
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Product information is compiled from manufacturer specifications, published standards information, compatibility data, and other cited sources.
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