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| Names | Builders | Commissioned | Losses | Transfers | Discarding |
|---|---|---|---|---|---|
S501 - S507 (ex-MAS566 - 570, 574, 575) |
Baglietto, Varazze, Italy: S501 - 505 Celli, Venezia, Italy: S506, 507 |
1941 // 5.1943: S501 - 507 |
S505 (1943), S507 (27.5.1943) |
Rumania, 8 - 10.1943: S502 - 504, 505 |
10.1943: S501 |
| Displacement standard, t | |
|---|---|
| Displacement full, t | 29.4 |
| Length, m | 18.7 |
| Breadth, m | 4.70 |
| Draught, m | 1.50 |
| No of shafts | 2 |
| Machinery | 2 Isotta-Frascini ASM183 petrol engines / 2 Alfa Romeo 2500 petrol engines for cruising |
| Power, h. p. | 2300 / 140 |
| Max speed, kts | 44.1 / 8 |
| Fuel, t | petrol 3.9 |
| Endurance, nm(kts) | 997(8) |
| Armament | 1 x 1 - 20/65 M1940, 2 - 450 TT, 1 DCR (10) |
| Complement | 10 |
MAS566-570, 574 and 575 in 1942-1943 operated on Black sea and 20.5.1943 were transferred to Kriegsmarine as S501-507.
None.
S507 27.5.1943 was lost as a result of collision at Feodosiya; remaining in October, 1943 were laid up at Romania, in the end of 1944 escaped upwards across Danube and were disarmed at Linz.

