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Black steel rectangular padlock with silver boron shackle, 1 inch height

Master Lock

Master Lock Padlock KA 1 In H 4 Pin Steel

SKU CH-0TTK-YN08R

Steel padlock with 1-inch boron shackle, four-pin cylinder and BumpStop technology keyed alike to A326

  • Product typeCommerical with BumpStop
  • Keyed alike for convenient multi-lock access
  • BumpStop cylinder resists bumping attacks
  • Hardened boron shackle withstands cutting force
  • Steel body provides durable weather resistance
  • Four-pin mechanism offers reliable daily security

Commercial padlock with BumpStop

This Master Lock padlock uses a four-pin cylinder and BumpStop technology to resist bumping attempts. The body is made of steel with a black and silver finish, while the shackle is boron alloy for added cut resistance. It measures 1 1/2 in high, 2 in wide and 1 in thick. All locks in the set open with key number A326.

Sustained physical security

The four-pin cylinder and BumpStop feature work together during prolonged attack scenarios to slow manipulation. Boron shackle material maintains its hardness under repeated cutting or sawing pressure. The rectangular steel body resists prying forces applied over time. No rekeyable or interchangeable core options are available on this model.

Environmental exposure and power

This padlock is not rated as weather resistant, so extended outdoor use may lead to corrosion of the steel body or shackle. It operates mechanically with a key, requiring no batteries or external power source. The standard shackle design provides 1 in of vertical clearance and 15/16 in of horizontal clearance for hasps or chains. Control key registration is not required.

How it compares

Measured against everything we stock in Door Lock Sets & Deadbolts, at today’s prices. Recalculated every night.

Price $12.99
Cheaper than about 83% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMaster Lock
Product typeCommerical with BumpStop

Questions about this item

How much heat does the steel body generate when the padlock is left locked all day?

The solid steel body and boron shackle are passive mechanical parts, so they produce no heat and require no power while locked.

What key do I already need to open this Master Lock padlock?

It opens with key number A326, so you must already have that specific key or a matching K1 keyway copy.

Will the 1‑inch shackle height fit the same hasp I use with my older 3/4‑inch shackle padlock?

The 1‑inch shackle height and 15/16‑inch width are larger than a 3/4‑inch shackle, so the hasp hole must accommodate the taller, slightly wider shackle.

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