Mark's Locksmith
| Dasco | 1022 | |
| Dauphin | 1098M, O1122A | |
| Dawes-Betterbilt | tool box | X7 |
| Deal-Tite | 1098M | |
| Deco | trailers, RVs | 1041T, O1122A, O1122B |
| Deco | S1096JN, DECO-1, DECO-D, OKB30, OKB31 | |
| Delta | truck toolbox | 1529, 1620 |
| Deluxe | padlocks | 192, try Viro blanks |
| Detex | door alarms | 1054UN, O1122, N1069B |
| Diamond | 1001EN, X1000FR, 999 | |
| Diamond | safes | BD551 |
| Dictograph | C999 | |
| Diplomat | safes | BD551, also use XL7 |
| Ditch Witch | SIM2 | |
| Dog brand | (not Blue Dog) | 1046 |
| Dominion | lockset | DO5, DO6 |
| Dominion | mailbox | 752 |
| Dominion | deadbolts, rim locks | S54F |
| Dong Hwa | safes | DONG HWA, OKB91, OKB4 |
| Donner | 1054K, 1176, 1092M, 1307A | |
| Donner | 1145, 192, 1176 | |
| Dorey | X1014F | |
| Dorn | padlocks | 1170, 192, 1145, 999 |
| Dune buggy | O1122 | |
| Durand | locker | 1033A |
| Durasteel | 1098M, 1000V, 999, O1122, H1054SR |