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OTO-Melara SIDAM 25

Self-Propelled Anti-Aircraft Gun (SPAAG) Vehicle [ 1987 ]

Using the chassis and hull of the American M113 APC and the existing Oerlikon autocannon, the Italians were able to produce a cost-effective air-defense weapon in the late 1980s.

Authored By: Staff Writer | Last Edited: 07/28/2022 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

Even into the 1980s the threat of open war in Europe against an invading Soviet force was very real. This prompted all major militaries of the region to continue to keep a noticeable presence as a natural deterrent. One of the largest threats to meet ground forces of the period would have been low-flying aircraft such as attack helicopters and this led to continued support for cost-effective, projectile-firing weapon systems for land forces.

When the Italian Army sought such a mobile, self-propelled weapons platform - and the OTO-Melara ADT failed to net much interest - it took a budget-conscious route and looked to the existing American M113 Armored Personnel Carrier (APC) of which it already operated in some number - thousands were in service and continue to be fielded today (2016). To this was added a turret component developed by OTO-Breda which sat four 25mm Oerlikon autocannons in a 2x2 pattern, the guns straddling the turret section. All other functions of the M113 remained intact and power was provided by a Detroit Diesel 6V-53 diesel-fueled engine of 215 horsepower allowing for a maximum road speed of 42 miles per hour and an operational range out to 310 miles. Armor protection was 38mm at its thickest and the operating crew numbered three. A side-mounted door was added for better crew access and firing ports were available for close-in self-defense by the operators.

The turret was given a full 360-degree rotating over the hull roof of the vehicle. Targets were dealt with through an optronic-based Fire Control System (FCS) as well as a laser rangefinder for accurized fire at range. However, no radar system was fitted to the machine which meant that its tactical capability was limited largely to good-weather, daytime operation. 8,600 x 25mm projectiles were typically carried and these were of the High-Explosive variety. A further 300 x 25mm shells of an Armor-Piercing (AP) flavor were stored on the vehicle should its guns need to contend with approaching enemy armor (limited to soft-skinned threats). Beyond this, the vehicle was also outfitted with a 7.62mm M136 Minigun Gatling-style support-minded weapon with 10,500 x 7.62mm ammunition carried.

The SIDAM 25 has remained in limited service since its introduction in 1987 with a total of 276 units completed. While never exported the turret has been seated on other foreign vehicle types seen in Brazil and Spain. The SIDAM 25 has also yet to see combat deployment and service.©MilitaryFactory.com
Note: The above text is EXCLUSIVE to the site www.MilitaryFactory.com. It is the product of many hours of research and work made possible with the help of contributors, veterans, insiders, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at MilitaryFactory AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.


Service Year

Italy national flag graphic

In Limited Service.

OTO-Melara (Leonardo-Finmeccanica) - Italy
(View other Vehicle-Related Manufacturers)
National flag of Italy Italy
(OPERATORS list includes past, present, and future operators when applicable)
Anti-Aircraft / Airspace Denial
Base model or variant can be used to search, track, and neutralize airborne elements at range.

16.6 ft
5.05 m
8.9 ft
2.7 m
6.1 ft
1.85 m
27,558 lb
12,500 kg
13.8 tons
(Showcased structural values pertain to the base OTO-Melara SIDAM 25 production variant. Length typically includes main gun in forward position if applicable to the design)
Powerplant: 1 x Detroit Diesel 6V-53 diesel-fueled engine developing 215 horsepower.
42.3 mph
(68.0 kph)
310.7 mi
(500.0 km)
(Showcased performance specifications pertain to the base OTO-Melara SIDAM 25 production variant. Compare this entry against any other in our database)
4 x 25mm Oerlikon KBA autocannons in traversing turret over hull.

Supported Types

Graphical image of a tank automatic cannon

(Not all weapon types may be represented in the showcase above)
Not Available.

SIDAM 25 - Base Series Name.

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Images Gallery

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Image of the OTO-Melara SIDAM 25
Image from the Italian Army.


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