85 mm O-365K high-explosive round

Also known as

O-365K
UO-365K
53-O-365K
53-UO-365K

The O-365K is a Soviet 85 mm high-explosive fragmentation round that METIS identifies as the 53-UO-365K fixed unitary round built around the 53-O-365K projectile. Tank Archives describes it as a steel-cased HE round with a KTM-1 fuse for use against personnel and light field fortifications, and its D-44 ballistic tables include O-365K HE data.

85 mm O-365K high-explosive round, 85 mm HE round, Munitions

Image source: On The Way Models RB_P04 Review

Profile / Specs

Profile

Origin: Soviet Union
Built by: Soviet Union
Type: 85 mm HE round

ammunition artillery ammunition he-frag high explosive projectile

Specifications

Caliber: 85 mm
Configuration: Fixed (unitary) HE-frag round
Projectile mass: 9.54 kg
Explosive filler: 0.646 kg
Fuze: KTM-1 family
Case: Steel-cased

Firing Weapons

Tank Archives ties the round to the Soviet 85 mm gun family and lists it in the D-44's ballistic tables.

Firing weapon

Weapon type

Firing evidence

D-44, 85 mm towed field gun, Artillery

85 mm divisional gun

Tank Archives' D-44 ballistic tables include O-365K HE data for the gun.

Sources: Tank Archives: D-44 Ballistic Tables

Service And Conflict Use

Service History

In service: Used in Soviet 85 mm gun families including tank, field, and anti-aircraft artillery systems.

Media

85 mm O-365K high-explosive round Images

85 mm O-365K high-explosive round, 85 mm HE round, Munitions - view 1 — Source: On The Way Models RB_P04 Review

85 mm O-365K high-explosive round, 85 mm HE round, Munitions - view 2 — Source: On The Way Models RB_P04 Review

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F-533 high-explosive shell, 152 mm old high-explosive shell, Munitions

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Sources

Tank Archives: D-44 Ballistic TablesPublisher: Tank Archives | Note: Supports the D-44 ballistic-table listing of O-365K HE data and the round's association with the Soviet 85 mm gun family. | Accessed: 2026-06-27 Tank Archives: 85 mm for DummiesPublisher: Tank Archives | Note: Supports the O-365K steel-cased HE round description, KTM-1 fuse, and use against personnel and light field fortifications. | Accessed: 2026-06-27 METIS: 53-UO-365K ProjectilePublisher: METIS | Note: Supports the 53-UO-365K fixed unitary HE-frag designation, the 53-O-365K projectile composition, and Soviet/Russian origin and manufacturing context. | Accessed: 2026-06-27 Battlefield.ru: 85mm S-18 Tank GunPublisher: Battlefield.ru | Note: Supports projectile mass and explosive filler figures for the O-365K family tables associated with Soviet 85 mm ammunition. | Accessed: 2026-06-27 On The Way Models RB_P04 ReviewPublisher: On The Way Models | Note: Supports image provenance for the page-specific ammunition review photographs used on this record. | Accessed: 2026-06-27