Master Lock 1-9/16" (40mm) Wide Laminated Steel Pin Tumbler Padlock with 2" (51 mm) Shackle

Yes. The 3 Series laminated steel padlock is offered in KA (keyed alike) so a group of locks all operate on the same key, or KD (keyed different) if each opening needs its own key. Keyed alike is the one property managers and maintenance crews usually want for a building's gates, storage rooms and cabinets, and you can also match it to other locks already running the W1 cylinder. There is a list of available key codes to choose from, and a free-text field where you can give your key number and note whether a substitute keyed alike number is acceptable if yours is unavailable.

The shackle is 9/32 inch in diameter with a 5/8 inch clearance between the legs, so the opening on your hasp staple or chain link has to pass a 9/32 inch bar, and anything you are locking through has to fit within that 5/8 inch span. The body itself is 1-9/16 inch wide, which is the size most standard hasps are built around.

No. The 4-pin W1 cylinder is non-rekeyable, so if a key is lost or an employee leaves, the lock gets replaced rather than re-pinned. Plan your keying at the time of order: if you expect turnover, buying extra locks on the same keyed alike code is the practical route, since you can add matching locks later off the same W1 code.

Yes, as long as your existing locks use the W1 cylinder. The 3 Series lock can be ordered keyed alike to match other W1 locks, and there is a field to enter your existing key number. You can also flag whether a substitute keyed alike number is acceptable if your exact code cannot be filled.

It is built around a laminated steel body with a hardened steel shackle for cut resistance, and dual ball bearing locking that resists prying on the shackle heel and toe. The description also calls out drilling and prying protection. Note that the product data classes it as residential rather than commercial duty, so for a high-exposure exterior gate that takes regular attack, step up to a shrouded or boron shackle padlock instead.

KD means keyed different, so every lock in the shipment has its own unique key, which suits tenant storage lockers where nobody should open a neighbor's unit. KA means keyed alike, where every lock in the order shares one key code, which is what you want for one maintenance key covering many locations. You pick one or the other on the order, and on KA you can also name the specific key code you already carry.

Four pins. A 4-pin tumbler gives basic pick resistance and a reasonable number of key differs, which is why it works well for keyed alike fleets of storage, cabinet and gate locks. If you need higher pick resistance or a restricted key that cannot be copied at a hardware counter, this is not that lock, since the cylinder is also non-rekeyable.