Mark's Locksmith
| K. V. | O1122, O1122B, 1069N | |
| Karrite | car top carrier | LF12-SI |
| Kason | refrigerators, step vans | 1000H |
| Kawneer | 999 | |
| Kennedy | tool box | 1557, 1565 |
| Kennedy | tool box | 1000V, 1000TS, 1000VS, 102AM |
| Kennedy | tool box | See Excelsior suitcase keys |
| Kirk | OKB151 | |
| Knapt Vogt KV90 | O1122 | |
| Kobalt | toolbox | 752 |
| Komatsu | forklift | 1519 |
| Kryptonite | 1567, OKB49, OKB122, OKB121, OKB89, OKB168 | |
| Kubota | tractors | 1539, 1540, OKB110, OKB111, OKB112, OKB113, OKB114, OKB115, OKB116, OKB134 |
| Kwikset | padlocks | KW1, 1167, 1096FL, 1096FM |
| Kymco | scooter | KYM1P, KYM1RP |