10.5 cm SK L/45 naval gun

{{Infobox weapon Nazi Germany World War II }}
 * name              = 10.5 cm SK L/45
 * image             = German submarine gun (6811866383).jpg
 * image_size        = 300
 * caption           = The gun from the submarine SM UB-91, displayed as a memorial at Chepstow in Wales
 * origin            = German Empire
 * type              = Naval gun
 * is_ranged         = Yes
 * is_bladed         =
 * is_explosive      = Yes
 * is_artillery      = Yes
 * is_vehicle        =
 * is_UK             =
 * service           = 1907–1945
 * used_by           = German Empire
 * wars              = World War I
 * designer          =
 * design_date       = About 1906–1907
 * manufacturer      = Peddinghaus
 * production_date   =
 * number            =
 * variants          =
 * weight            = {{cvt|1450|kg|lb}}
 * length            = {{cvt|4.725|m|ftin}}
 * part_length       =
 * width             = {{cvt|6.8|mm|in}}
 * height            =
 * crew              =
 * cartridge         = Fixed Brass Casing: {{cvt|25.5|kg|lb}}
 * cartridge_weight  = {{cvt|17.4|kg|sp=us}}
 * caliber           = {{cvt|10.5|cm|in}}
 * action            =
 * rate              = 15 RPM
 * velocity          = {{cvt|710|m/s|ft/s}}
 * range             = {{cvt|12,700|m}}
 * max_range         = Horizontal: {{cvt|12700|m|yd}} at 30° Vertical: {{cvt|8230|m|ft}} at 80°
 * feed              =
 * sights            =
 * breech            = Horizontal sliding-block
 * recoil            =
 * carriage          =
 * elevation         = Dependent on mounting:
 * MPL C/06: -10° to +30°
 * Tbts LC/16: -10° to +50°
 * Ubts LC/16: -10° to +50°
 * Flak 45: -5° to +70°
 * MPLC/30: -9° to +80°
 * traverse          = 360°
 * depth             = {[cvt|1.25|mm|in}}

The 10.5 cm SK L/45 (Schnelladekanone Länge 45, quick-loading cannon with a barrel length of 45 calibers) was a German naval gun that was used in World War I and World War II and was the successor of the older 10.5 cm SK L/40 naval gun.

Description
The 10.5 cm SK L/45 gun weighed 1450 kg, had an overall length of 472.5 cm. It used a horizontal sliding-block breech design. Cradle is usually mounted on a conical pedestal mount, bolted to the submarine deck.

The guns were carefully designed according to the requirements of submarine operations and was therefore streamlined in design. Many items manufactured from brass to resist corrosion.

It was used on many German and foreign ships like SMS Mowe and Ottomon cruiser Midilli.

Naval use
• B 97-class

• Galeb-class

• Graudenz-class

• Karlsruhe-class

• Kolberg-class

• Magdeburg-class

• Pillau-class

• Type 35

• Type U 66

• Type U 87

• Type UB III

• Type UE II

• V25-class

Weapons of comparable role, performance and era

 * QF 4 inch Mk V naval gun Approximate British equivalent firing slightly lighter shell
 * 4"/50 caliber gun Approximate US equivalent, firing slightly lighter shell at higher velocity