Lockout Hasps

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. All models accept standard 6mm to 9mm padlock shackle diameters common to industrial lockout padlocks. 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.

Frequently Asked Questions

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

Standards & references
Selection guidance on this page is mapped to these primary sources:

OSHA 29 CFR 1910.147 — Control of Hazardous Energy (Lockout/Tagout)

Cited for reference only. Standards text is not a substitute for a written program, a hazard assessment, or evaluation by a qualified safety professional.

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