Soviet/Russian 152mm OF-540 HE Projectile – NFC Ordnance Training System

Soviet/Russian 152mm OF-540 HE Projectile

Overview

The 152mm OF-540 (Cyrillic: ОФ-540) is the standard high-explosive fragmentation projectile for Soviet and Russian 152mm gun-howitzer systems. Introduced in the 1960s alongside the D-20 gun-howitzer, the OF-540 became the workhorse ammunition of Soviet divisional and army-level artillery. Its designation follows Soviet nomenclature conventions where “OF” indicates “Oskolochno-Fugasny” (fragmentation-high-explosive). The OF-540 has seen extensive combat use across multiple decades and continents, and remains in active service with the Russian Federation and numerous other nations that operate 152mm artillery systems of Soviet origin.

Country/Bloc of Origin

Primary Origin: Soviet Union (USSR)
Current Production: Russian Federation
Development Period: Late 1950s to early 1960s
Design Bureau: Soviet artillery development establishments
International Distribution: Exported extensively throughout the Cold War to Warsaw Pact nations, Middle Eastern countries, African nations, Asian countries, and various Soviet client states
Licensed Production: Manufactured in multiple countries including China, North Korea, Egypt, Iraq, Iran, and others
Successor State: Russian Federation continues production and maintains the OF-540 in active inventory

Ordnance Class

Type: Artillery projectile
Primary Role: High-explosive fragmentation (dual-purpose)
Delivery Method: Gun-launched from 152mm gun-howitzers
Category: Conventional ammunition, separate-loading
Fire Support Role: General fire support, counter-battery fire, suppression, and destruction of personnel, light fortifications, and unarmored vehicles
Tactical Employment: Division and corps-level artillery missions

Ordnance Family/Nomenclature

Primary Designation:

GRAU Index: 53-OF-540 (complete round designation)
Projectile Index: OF-540
Cyrillic: ОФ-540

NATO Reporting:

Recognized in NATO ammunition identification guides as Soviet 152mm HE

Related Family Members:

OF-540Zh: Variant with improved fragmentation characteristics
OF-25: Earlier 152mm HE projectile (for ML-20)
OF-29: Alternative HE projectile for some 152mm systems
OF-843B: Extended-range full-bore (ERFB) variant (see separate lesson)

Compatible Weapon Systems:

D-20 152mm gun-howitzer (primary)
2S3 Akatsiya self-propelled howitzer (primary)
2S19 Msta self-propelled howitzer
2A65 Msta-B towed howitzer
2S5 Giatsint-S self-propelled gun
2A36 Giatsint-B towed gun

Associated Propellant Charges:

Zh-540 series variable charges
Full charge and reduced charge configurations

Hazards

Primary Hazards:

Blast: Substantial overpressure effect; lethal within immediate vicinity of detonation point
Fragmentation: Primary lethal mechanism; steel body fragments into high-velocity shrapnel
- Lethal radius: Approximately 30-40 meters
- Casualty radius: 50-75 meters
- Fragment danger zone: 200+ meters
Ground Penetration: With delay fuzing, can penetrate light cover before detonation

Sensitivity Considerations:

Fuze Sensitivity: Point-detonating fuzes are impact-sensitive when armed
Booster Charge: Contains sensitive secondary explosive
Spin Requirements: Designed to arm only with proper spin rate (bore-safe)

Environmental and Aging Hazards:

Corrosion: Steel body and fuze components susceptible to corrosion affecting reliability
Temperature Extremes: Extended storage outside rated temperatures may affect explosive stability
Propellant Degradation: Separate propellant charges can degrade, affecting performance and safety

UXO-Specific Hazards:

Dud Rate: Varies with fuze condition, firing parameters, and target surface
Partial Arming: Impact without detonation may leave fuze in armed or partially armed state
Booster Sensitivity: Exposed or damaged boosters present heightened risk
Ground Conditions: Soft soil impact may prevent fuze functioning, creating unexploded rounds

Fragment Characteristics:

Controlled fragmentation design produces numerous steel fragments
Fragment velocity at detonation approximately 1,000+ m/s
Fragment mass distribution optimized for anti-personnel effect

Key Identification Features

Dimensions:

Total Length: Approximately 650mm (25.6 inches)
Body Diameter: 152.4mm (6 inches)
Total Weight: 43.56 kg (96 lbs)

Physical Characteristics:

Nose: Ogival (curved) profile with fuze well
Body: Cylindrical steel shell with controlled fragmentation serrations (internal)
Base: Boat-tailed for improved aerodynamic performance
Rotating Band: Copper alloy band near base for barrel engagement
Fuze Well: Threaded nose cavity accepting standard Soviet artillery fuzes

Color Schemes:

Standard: Olive drab (OD green) or gray-green
Markings: Stenciled in white or black
Condition Bands: May include colored bands indicating fuze compatibility or lot information

Marking System:

Caliber and Type: “152mm OF-540” or Cyrillic equivalent
Lot Number: Indicates manufacturing batch
Factory Code: Numerical code identifying production facility
Year of Manufacture: Two or four-digit year
Explosive Fill: Designation indicating TNT, A-IX-2, or other fill
Weight Markings: May include weight zone classification

Distinctive Features:

Soviet-standard fuze well threading
Boat-tail base with potential tracer or base plug
Single copper rotating band
Smooth external body (fragmentation grooves internal)

Fuzing Mechanisms

Standard Fuzes:

RGM-2 Point-Detonating Fuze:

Most common fuze for OF-540
Functions: Super-quick and delay (0.05 seconds)
Arming: Setback and centrifugal (spin)
Selection: Rotating nose cap for SQ/delay selection

V-90 Variable Time Fuze:

Mechanical time fuze
Settable time of flight
Used for airburst missions

AR-30 Multi-Function Fuze:

Modern proximity and impact fuze option
Provides airburst, point-detonation, and delay functions

Arming Sequence:

Setback Phase: Propellant ignition acceleration releases primary safety
Spin-Up Phase: Barrel rifling imparts rotation; centrifugal force acts on rotor
Rotor Alignment: At sufficient spin rate, detonator aligns with firing pin path
Muzzle Exit: Full arming completes at safe distance from gun
Terminal Phase: Impact or proximity trigger initiates firing pin, detonator, booster, and main charge

Safety Features:

Bore Safety: Multiple mechanical safeties prevent in-bore detonation
Minimum Spin Requirement: Fuze will not arm without prescribed rotation rate
Setback Interlock: Acceleration safety must release before spin arming can occur

Booster:

Type: Typically tetryl or RDX-based
Function: Amplifies fuze output to initiate main explosive charge

History of Development and Use

Development Timeline:

Late 1950s: Development initiated alongside D-20 gun-howitzer program
1960: D-20 enters Soviet service; OF-540 standardized as primary HE projectile
1971: 2S3 Akatsiya self-propelled howitzer adopted, using same ammunition
1980s: Production continues; extensive export and licensed manufacturing
1989: 2S19 Msta enters service, maintaining OF-540 compatibility
Present: Remains in production and active service

Combat History:

Vietnam War Era:

North Vietnamese forces employed Soviet-supplied 152mm systems
OF-540 and related ammunition used against South Vietnamese and U.S. positions

Middle East Conflicts:

Egyptian and Syrian use in 1967 and 1973 Arab-Israeli Wars
Iraqi use throughout Iran-Iraq War (1980-1988)
Employment in various Lebanese Civil War phases

Soviet-Afghan War (1979-1989):

Extensive use by Soviet forces
Fire support for ground operations

Post-Soviet Conflicts:

Chechen Wars (1994-1996, 1999-2009)
Georgian conflicts
Donbas conflict (2014-present)
Russian operations in Syria
Ukraine conflict (2022-present)

Global Distribution: The OF-540 has been fired in conflicts across Africa, Asia, and the Middle East wherever Soviet-pattern artillery was employed. Its widespread distribution makes it one of the most commonly encountered 152mm projectile types globally.

Production and Stockpiles:

Manufactured in massive quantities during Soviet era
Production continues in Russia
Large stockpiles exist in former Soviet states and client nations
Significant UXO presence in multiple conflict zones

Technical Specifications

Specification	Value
Caliber	152.4mm
Projectile Weight	43.56 kg
Explosive Fill Type	TNT, A-IX-2, or TNT/RDX
Explosive Weight	5.86 kg (TNT) to 6.25 kg (A-IX-2)
Muzzle Velocity (D-20)	655 m/s (full charge)
Maximum Range (D-20)	17,410 m
Maximum Range (2S3)	18,500 m
Maximum Range (2S19)	24,700 m (with enhanced charges)
Lethal Radius	~40 m
Casualty Radius	~70 m
Fragment Danger Radius	200+ m
Fuze Thread	Soviet standard artillery fuze thread
Rotating Band Material	Copper alloy
Operating Temperature	-40°C to +50°C

Propellant Charge Options:

Full charge for maximum range
Reduced charges for shorter ranges and higher angles

Frequently Asked Questions

Q: What does “OF-540” mean in Soviet ammunition nomenclature? A: “OF” stands for “Oskolochno-Fugasny” (Осколочно-Фугасный), meaning “fragmentation-high-explosive” in Russian. The number “540” is the specific model index assigned by the GRAU (Main Missile and Artillery Directorate). Soviet ammunition nomenclature systematically categorizes rounds by function and assigns unique numerical identifiers for logistics and technical documentation.

Q: How does the OF-540 compare to the U.S. 155mm M107 HE projectile? A: Both are conventional steel-body HE projectiles of similar generation and purpose. The M107 is slightly heavier (43.2 kg vs 43.56 kg) and carries marginally more explosive (6.62 kg vs 5.86 kg TNT). Effective ranges depend on the firing system rather than the projectile alone. Both produce comparable fragmentation effects. The primary difference is caliber (155mm vs 152.4mm) requiring entirely different artillery systems.

Q: Why does the OF-540 have internal rather than external fragmentation grooves? A: Internal serrations (fragmentation grooves) maintain a smooth external profile for optimal aerodynamics while still controlling fragment size and distribution upon detonation. External grooves would create drag and reduce range. The internal pattern ensures predictable breakup of the projectile body into lethal fragments while preserving ballistic performance.

Q: What is the difference between OF-540 and OF-540Zh? A: The OF-540Zh is an improved variant with enhanced fragmentation characteristics. The “Zh” suffix indicates modifications to the projectile body design or explosive fill that optimize fragment production and distribution. Both variants are dimensionally compatible with the same weapon systems and fuzes.

Q: Can OF-540 projectiles be fired from all Soviet 152mm artillery systems? A: The OF-540 is compatible with most Soviet 152mm gun-howitzers including the D-20, 2S3, 2S19, and Msta-B. However, some specialized systems like the 2S5 Giatsint use different ammunition optimized for their higher-velocity characteristics. While there is broad compatibility within the 152mm family, specific projectile-to-gun matching should be verified using official compatibility tables.

Q: What fuze is most commonly used with the OF-540? A: The RGM-2 point-detonating fuze is the most common, offering super-quick and delay options suitable for most fire support missions. The V-90 mechanical time fuze is used for airburst effects, while modern AR-30 proximity fuzes provide enhanced terminal effects when available.

Q: Why does the OF-540 remain in service when more modern ammunition exists? A: The OF-540 remains effective for general fire support missions and exists in massive stockpile quantities. Its compatibility with widespread 152mm systems, proven reliability, and adequate performance for conventional bombardment make replacement unnecessary for many applications. More advanced ammunition like the OF-843B ERFB provides extended range when needed, but the basic OF-540 remains cost-effective for standard missions.

Q: What is the UXO threat from OF-540 projectiles? A: OF-540 UXO presents significant hazards due to the large explosive content, potential for partial arming, and sensitivity of point-detonating fuzes. Dud rates vary based on fuze condition, impact angle, and ground type. Soft soil impacts frequently prevent fuze functioning. All suspected UXO should be reported to qualified disposal authorities and never approached or handled by untrained personnel.

SAFETY NOTICE: This lesson is intended for educational and training purposes. All ordnance should be considered dangerous until proven safe by qualified personnel. Unexploded ordnance should never be handled by untrained individuals—report findings to military or law enforcement authorities.