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A M1 key

The M1 is a common key profile which is widely used by Master Lock padlocks and many knock-off brands.

These locks include the Master Lock No 1, 2, 3, 4, 5, and 6. The blank has space for 4 pins stacks and is widely produced by key blank manufacturers such as ILCO and HY-CO.

The profile of a M1 key blank.

Master Lock uses the part number 1K for their key blank.

  • ILCO 1092 or M1
  • JMA MAS-1
  • Silca MS2
  • Taylor 92
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