Technical Foundation
What Is a Lockout Hasp?
A lockout hasp is a device that fits over an energy-isolating device (a breaker lock, valve lockout, or plug lockout) and provides multiple holes so several workers can each apply their own padlock, ensuring equipment cannot be re-energized until every worker involved in the job has removed their individual lock. This group lockout capability is central to OSHA's control of hazardous energy standard (29 CFR 1910.147), since a single-lock hasp cannot safely accommodate a multi-person or multi-trade job on the same isolation point.
Hasp jaw diameter must fit through the specific lockout device's shackle opening or hole, and material selection trades off durability against environment — steel hasps resist the highest force and tampering attempts, aluminum offers a lighter non-sparking option suited to most general industrial use, and nylon/plastic hasps are lower-cost but generally reserved for lower-risk or less frequently used isolation points. Lock capacity (the number of padlock holes) should meet or exceed the maximum number of workers expected to lock out the same point simultaneously.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Jaw Diameter | 1/4 in. to 1 in. typical | Must fit through the specific lockout device's shackle opening or mounting hole |
| Lock Capacity | 3, 6, or adjustable up to 12+ locks | Must meet or exceed the maximum concurrent workers on the same isolation point |
| Material | Steel, aluminum, nylon/plastic | Steel resists tampering/force; aluminum is lighter and non-sparking; nylon is lower-cost |
| Hasp Type | Fixed-jaw, adjustable/scissor | Adjustable hasps fit a range of shackle sizes without stocking multiple fixed sizes |
| Regulatory Basis | OSHA 29 CFR 1910.147 group lockout | Group hasp use is central to compliant multi-worker lockout/tagout procedures |
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Applications
Where Lockout Hasps Get Used
Lockout hasps are specified anywhere multiple workers must independently lock out the same energy-isolating device during servicing or maintenance.
Manufacturing Equipment Servicing
Group lockout hasps enabling multiple maintenance workers to safely isolate machinery during servicing.
Electrical Panel & Breaker Lockout
Hasps combined with breaker lockout devices to secure multi-worker electrical isolation.
Valve & Piping System Isolation
Lockout hasps applied to valve lockout devices during process piping maintenance and turnarounds.
Utility & Plant Maintenance Turnarounds
Multi-lock hasps supporting large crews performing coordinated lockout during scheduled shutdowns.
Construction & Contractor Site Safety
Adjustable hasps accommodating varied lockout points across mixed-trade construction and demolition sites.
FAQ
Lockout Hasps Questions, Answered
Why can't a single padlock be used instead of a hasp for multi-worker jobs?
OSHA's lockout/tagout standard requires that equipment not be re-energized until every worker exposed to the hazard has personally removed their own lock — a single shared padlock or key doesn't provide that individual accountability. A group lockout hasp lets each worker apply their own uniquely-keyed padlock to the same isolation point, with the equipment staying locked until every lock is removed.
How many lock holes do I need on a lockout hasp?
Choose capacity to meet or exceed the maximum number of workers who might reasonably be working on the same isolation point at once, including different trades on a larger job — an adjustable or higher-capacity hasp adds flexibility if crew size varies by job rather than being fixed.
Steel, aluminum or nylon hasp — which should I use?
Steel hasps offer the highest resistance to force and tampering, appropriate for high-risk or frequently contested isolation points. Aluminum is lighter, non-sparking, and adequate for most general industrial use. Nylon/plastic hasps cost less and are typically reserved for lower-risk points or less frequent use where extreme durability isn't the priority.
How do I know what jaw diameter hasp I need?
Jaw diameter must be sized to fit through the shackle opening or mounting hole of the specific lockout device (breaker lockout, valve lockout, plug lockout, etc.) it will be paired with — measure the device's opening directly rather than guessing from the device's overall size, since openings vary across manufacturers and device types.
Are lockout hasps required to be OSHA compliant, or just a good practice?
Group lockout capability is a practical requirement for complying with OSHA's control of hazardous energy standard whenever more than one worker is exposed to the same isolation point — while the hasp itself isn't separately certified, using an appropriately sized, functioning hasp is how facilities meet the standard's individual-lock accountability requirement in multi-worker situations.
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