Lockout Hasps

Which lockout hasps fit your group isolations?

Short answer: lockout hasps are the scissor-jaw multipliers of group lockout — one hasp clamps the isolation point, up to six workers hang personal padlocks through its holes, and the equipment stays dead until the last lock comes off. Six listings live here: the classic Master Lock 421 single, WUWEOT stainless steel 8-packs in 1 in and 1.5 in jaws, BULANGDI extended jaw 10-packs in stainless and red aluminum, and the BOZZYS 6-hole 6-pack. Fill the holes from safety padlocks, tag per lock out tags, and see the whole program on lockout tagout.

Editor's pick — Master Lock 421 hasp
The reference scissor hasp — the 1-1/2 in jaw pattern every other listing on this shelf is imitating, from the brand whose name is on the wall chart. Read the full listing.

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Lockout Hasps — Multi-Lock Group LOTO Hardware for Energy Isolation

Lockout hasps are the essential group LOTO hardware that allows multiple workers to simultaneously apply their individual padlocks to a single energy isolation point — ensuring that the equipment remains de-energized until every worker has completed their portion of the maintenance task and removed their personal lock. Without a hasp, only one padlock can secure an energy isolation device at a time, limiting group LOTO procedures to single-worker application or requiring each worker to install their own redundant isolation devices at additional energy points. The hasp solves this limitation by providing multiple shackle holes in a single jaws mechanism that clamps securely to lockout hardware, allowing the simultaneous security of 6, 7, 8, or more individual padlocks.

OSHA 29 CFR 1910.147 establishes group LOTO procedures that require each authorized employee in a group servicing activity to have personal control over their exposure through their own individual padlock. When a group works on a single machine, the procedure typically requires one authorized employee to apply lockout to all energy isolation devices, then apply a group lockout hasp to a single master lockout point, onto which each worker applies their own personal lock. The machine cannot be re-energized until every individual has removed their personal lock — providing each worker with direct, personal control over when the equipment returns to service, regardless of supervisory pressure or work schedule changes.

Lockout hasp designs vary in the number of individual lock holes provided — standard models accommodate 6 locks, larger models accommodate up to 12, and heavy-duty industrial models allow even more. Selecting hasps with adequate lock hole capacity for the maximum expected group size prevents the addition of excess hasps or improvised solutions that complicate the documented LOTO procedure. Hasps with both a clamp jaw for securing to isolation hardware and multiple shackle holes allow a single hasp to serve as both a securing device and a multi-lock accommodator in one piece of hardware.

Material selection for lockout hasps affects their durability in industrial environments. Stainless steel hasps provide corrosion resistance for outdoor installations, chemical environments, and washdown facilities. Aluminum hasps offer good strength-to-weight ratio for general industrial use. Nylon hasps provide electrical non-conductivity important in electrical maintenance work and resistance to most process chemicals. Color-coded hasps in red, blue, green, yellow, and orange support visual management programs that identify the type of energy being isolated or the maintenance group responsible for the LOTO procedure.

Hasp dimensions must match the isolation hardware they are intended to secure. A hasp jaw opening that is too small will not fit over the isolator's shackle or locking arm, while one that is too large may not clamp securely and could be dislodged. LOTO kit configurations that package hasps with compatible lockout padlocks and assorted isolation hardware in a single portable kit ensure that maintenance workers have correctly matched components for standard LOTO applications without improvising from mismatched equipment.

Our lockout hasp collection includes single-jaw models for standard clamp-style application, scissor-style hasps for larger shackle openings, and combination hasp sets for organizations building out comprehensive group LOTO programs. The listings on this shelf do not publish per-model shackle-diameter limits — verify your padlock shackles fit the stated jaw before standardizing on either. Bright safety orange is the standard color for LOTO hasps in compliance with OSHA's requirement for standardized LOTO hardware, though additional colors are available for multi-group and color-coded programs.

All six lockout hasps listings, compared

Jaw size is the compatibility spec — it must close around the energy-isolating point — and the extended jaw variants exist for valve stems and thick disconnect handles that a standard jaw cannot swallow. One catalog note: WUWEOT’s two 8-packs differ only by jaw size at the same price, so read the title before ordering.

Our methodology

The table is read from the six member listings’ own titles — all six are genuinely hasps, every member linked (the prior page linked 4 of 6). A prior blanket claim that all models accept 6–9 mm shackles was removed: the listings do not state shackle limits, so this page does not either. Program requirements come from OSHA 29 CFR 1910.147 (control of hazardous energy) with device context from the NIOSH hazardous-energy program. We do not test devices and hold no safety certification.

Why trust this page

WC Safety is an independent review site with no products of its own — nothing here is stocked, warehoused or shipped by us. Purchase links go to Amazon and earn an affiliate commission at no extra cost to you; no manufacturer pays for placement, which is why this page reports exactly what each listing states and marks what it omits.

Frequently Asked Questions

How many workers can lock onto one hasp?

As many holes as the hasp carries — six on the patterns here — and hasps daisy-chain: hang a second hasp through the last hole of the first when a crew outgrows six. Every authorized worker applies a personal lock; nobody is protected by someone else’s.

Standard or extended jaw — which lockout hasp?

Measure the isolation point. Standard 1–1.5 in jaws close around most breaker toggles and small valve stems; extended jaw models reach around thick disconnect handles and larger stems. Both work identically once closed — the jaw just has to shut.

What is lockout/tagout?

OSHA 1910.147 defines lockout/tagout as the way to isolate hazardous energy while equipment is being serviced, so it cannot fire up unexpectedly and harm the worker on it.

Why does each worker apply their own lock?

By giving every authorized worker a personal lock and the only key, the system keeps the machine isolated until each of them wraps up and removes the lock they applied.

When do I use a lockout hasp?

Reach for a hasp when several workers must each add a padlock to one energy-isolation point; the device stays locked down until the final worker removes their padlock.

What is the difference between lockout and tagout?

With a lock, energization is physically prevented, while a tag does nothing but warn. OSHA prefers locking out and allows tag-only control where a lock cannot be used, with extras.

Where should lockout hasps be stored?

Keep hasps alongside padlocks and tags at a tidy station or board near the work zone, making sure the right devices are easy to find and accounted for before a job.

What energy sources must be controlled?

Mechanical, electrical, hydraulic, pneumatic, and thermal energy must all be isolated up front, and so must stored energy from springs, capacitors, and gravity.

Who is allowed to remove a lockout hasp?

Removal stays with the worker who installed the device, except through a documented, supervised procedure used once that worker is verified off-site and unavailable.

How many locks can a hasp hold?

A lockout hasp provides multiple eyes so each crew member adds their own padlock to a single isolation point, and the equipment cannot release until every lock comes off.

Do I need written lockout procedures?

Absolutely, OSHA requires energy-control procedures written for each specific machine, supported by periodic inspections and authorized employees who are trained for the task.

Are lockout hasps reusable?

Hasps, like padlocks and most lockout hardware, are durable enough to reuse on countless jobs, whereas warning tags tend to be single-use and get replaced each time.

Related Safety Gear & Guides

• WUWEOT Lockout Hasp — Stainless Steel 1.5-Inch Jaw, 8-Pack
• BULANGDI Lockout Hasp — Stainless Steel 1-Inch Extended Jaw, 10-Pack
• Bozzys Group Lockout Hasp — 6-Hole Steel, 6-Pack
• BULANGDI Lockout Hasp 10-Pack — Red Aluminum, 1.5" Extended Jaw
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Researched and written by Steven Eaton, editor of WC Safety. Steven holds no safety certification and does not test products; this page compares what manufacturers publish, with the gaps in that record marked. Last reviewed July 2026.