130 mm/58 SM-2-1 (130 mm)
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Vehicles equipped with this weapon
The SM-2-1 130 mm weapon system is the Russian "equivalent" to the 5 inch/38 Mk.12 weapon system in terms of reliability, calibre, and use. This weapon system is completely new to the WW2 Soviet 130 mm cannons as it features an autoloader, enhanced targeting, and radar capabilities. As already seen in Russian 130 mm cannons, they are multi-purpose weapon systems with devastating AA capabilities. However, compared to the Mk.12, it has a significantly reduced ROF (15 RPM vs 22 RPM) but it counters that with much faster targeting speeds and better cannon elevation angles.
The SM-2-1 has access to three types of ammunition: OF-42 HE, PB-42 SAP and ZS-42R HE-VT. The OF-42 offers a very potent destructive effect against lightly armoured targets and a superior HE filler than the ZS-42R HE-VT. However, as most HE shells, it barely has the penetration to counter armour (just 37 mm of penetration at all ranges and angles). The PB-42 SAP offers a midpoint between APCBC and HE shells as it has a decent explosive filler with sufficient armour penetration (203 mm flat at 1,000 m). This round should be the main round utilized when fighting all type of ships due to the armour penetration. Lastly, the ZS-42R HE-VT round offers a superb explosive filler for AA purposes but is almost half of the explosive filler of the OF-42 HE. Since it has a proximity fuze, engaging aircraft is much easier.
|Ammunition|| Type of
|Penetration @ 0° Angle of Attack (mm)|
|1,000 m||2,500 m||5,000 m||7,500 m||10,000 m||15,000 m|
|130 mm OF-42 HE||HE||37||37||37||37||37||37|
|130 mm PB-42 SAP||SAPCBC||203||176||146||127||113||95|
|130 mm ZS-42R HE-VT||HE-VT||35||35||35||35||35||35|
|Ammunition|| Type of
| Fuse delay
| Fuse sensitivity
| Explosive Mass
(TNT equivalent) (g)
|130 mm OF-42 HE||HE||950||33.4||0||0.1||3,830||79°||80°||81°|
|130 mm PB-42 SAP||SAPCBC||950||33.4||4||5||2,210||48°||63°||71°|
|130 mm ZS-42R HE-VT||HE-VT||955||33.08||0||0.1||3,000||79°||80°||81°|
Comparison with analogues
The SM-2-1 has a better handling in general than B-13's, to be expected from a much modern weapon system.
Compared to 5 inch/38 Mk.12 (127 mm)
As previously discussed, both systems, while very similar, have many differences, primarily the targeting speed and ROF. The SM-2-1 is able to hold a firing for longer with much better performing ammunition. While the 5 inch AAVT Mk.31 has a slightly better explosive filler than the ZS-42R (3.22 kg vs 3 kg) it has a huge speed reduction (792 m/s vs 955 m/s) making it much harder to aim and hit aircraft. The benefit of the SM-2-1 over the Mk.12 while doing AA duties is the elevation angle (-10°/+35° vs -15°/+82°).
Compared to 4.5 inch/45 QF Mark V (114 mm)
The 4.5 inch Mark V is the closest system to the SM-2-1. While it has a faster ROF (20 RPM vs 15 RPM) it has slightly reduced targeting speed (17°/s vs 18°/s). In terms of ammunition they are pretty much the same when it comes to type of ammunition, but the SM-2-1 has overall better performing ammunition due to the increased calibre.
Compared to 4.7 inch/45 Mk.XII (120 mm)
As expected from a Cold War weapon system fighting to a WW2 one, the SM-2-1 has a superb performance over it in all aspects. Different from the other systems, the SM-2-1 now has a better ROF (15 RPM vs 12 RPM).
Usage in battles
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Pros and cons
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|USSR naval cannons|
|30 mm||AK-230 · 30 mm/54 AK-630 · BP "Plamya"|
|37 mm||37 mm/67 70-K · V-11|
|45 mm||45 mm/46 21-K · 45 mm/68 21-KM · 45 mm/89 SM-20-ZIF|
|75 mm||75 mm/50 Canet patt.1892|
|76 mm||34-K · 39-K · 76 mm/60 AK-176M · AK-726 · D-56TS · F-34 · Lender AA gun, pattern 1914/15|
|85 mm||85 mm/52 92-K · 85 mm/54.6 ZIS-C-53 · 90-K|
|100 mm||100 mm/56 B-34 · 100 mm/70 SM-5-1 · Minizini|
|102 mm||Pattern 1911|
|120 mm||120 mm/50 pattern 1905|
|130 mm||130 mm/50 pattern 1913 · 130 mm/58 SM-2-1 · B-13|
|152 mm||152 mm/57 B-38|
|180 mm||180 mm/57 B-1-P · 180 mm/60 B-1-K|
|305 mm||12-inch/52 pattern 1907|
|40 mm||2pdr QF Mk.IIc (Britain)|
|47 mm||3 pdr QF Hotchkiss (Britain)|