Hasps
A lockout hasp lets several workers each apply their own safety padlock to a single isolation point. The hasp cannot be released until the last lock comes off — so the machine stays isolated while anyone is still working on it. This is the core device for group lockout, and it is what stops one person’s “all clear” from re-energising the plant on somebody else.
Choose on three things
- How many people. Hasps here take from three to seven padlocks. Count the largest crew that will ever work the isolation, then allow one. For jobs bigger than that, use a group lock box instead.
- Jaw or shackle size. The jaw has to close around the isolation point — 25 mm and 38 mm jaws for standard hasps, up to 80 mm clearance on the large nylon hasp for switchgear. Measure what you are locking on to before ordering; a jaw that will not close is a hasp you cannot use.
- Material. This is the decision that matters most:
Steel, aluminium or nylon?
- Nylon — fully non-conductive. The correct choice for electrical work, and it will not corrode in washdown or chemical areas.
- Steel — the strongest jaw, for mechanical isolation, valves and gates. PA-coated for grip and insulation on the handle.
- Aluminium — spark-proof and lighter to carry all day, where a dropped steel hasp is an ignition risk.
- 316 stainless — for marine, coastal, food-processing and chemical plant, where plated steel rusts out and seizes.
Hasps hold padlocks but are not supplied with them — see safety padlocks, and note that each worker needs their own keyed different lock for group lockout to mean anything.
New to group lockout? Our guide to energy isolation explains where hasps and lock boxes each fit. In stock in New Zealand, fast dispatch.
