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Master #6121 Weather Tough Padlock with K1 Cylinder


  • 2-1/8" (54mm) wide laminated steel body for superior strength.
  • Hardened boron alloy shackle for superior cut resistance.
  • Removable cylinder can be replaced or repinned.
  • Dual ball bearing locking mechanism resists pulling and prying.
  • Body and cylinder covers protect locks from water, dirt and grime.
  • Heavy steel bodies withstand forcible attacks.

MSRP = $31.96

What we have done here is to take the Weather Tough Master 6121 padlock and replaced the standard 5-pin cylinder with a 4-pin W1 cylinder that we can key alike to match the many other Master Lock K1 keyed products such as receiver locks, trailer coupler locks, etc.

Granted, you lose a little security going from 5 to 4 pins in the cylinder, but thieves rarely attack the cylinder anyway and anyone trying to pick it is going to get really confused since they will be expecting a 5-pin lock. What you gain is a much heavier body and shackle than is otherwise available in a 4-pin padlock and it is the shackle that thieves most commonly attack.

Uses a Master K1 Key and can be matched to many other Master Lock products in our inventory: see our section on "Keyed-Alike Locks".
Master K1 Keyway Comes with 2 Keys Rekeyable
Available in Keyed-Alike sets (specify below).

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  • Model: MA-6121K1
  • Shipping Weight: 2lbs
  • Manufactured by: Master Lock

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