V40 Mini Fragmentation Grenade
1. Overview
The V40 Mini Fragmentation Grenade is an exceptionally compact defensive fragmentation hand grenade, roughly the size of a golf ball. Developed in the Netherlands in the late 1960s, the V40 was designed to allow special operations forces to carry a large number of grenades without being significantly encumbered. Despite its diminutive size, the V40 delivers effective fragmentation at close range and earned a reputation as a reliable close-quarters weapon. It is commonly known by the nicknames “Mini-Frag,” “Golf Ball Grenade,” and “Hooch Popper.”
⚠ SAFETY WARNING: All ordnance should be considered dangerous until rendered safe by qualified EOD personnel. Unexploded ordnance should never be handled by untrained individuals. Report all suspected ordnance to military or law enforcement authorities. This information is for educational and identification training purposes only.
2. Country/Bloc of Origin
- Country: The Netherlands
- Manufacturer: Nederlandse Wapen en Munitiefabriek (NWM) de Kruithoorn
- Period of Development: Late 1960s
- International Use: Although developed in the Netherlands, the V40 was never adopted by the Dutch Armed Forces. It was primarily procured by the United States (especially special operations units such as Navy SEALs and MACV-SOG) and later by the Canadian Armed Forces. Viet Cong and PAVN forces also produced copies during the Vietnam War, utilizing the fuze of the RGD-5 grenade.
3. Ordnance Class
- Type: Hand grenade
- Primary Role: Anti-personnel, defensive fragmentation
- Delivery Method: Hand-thrown
4. Ordnance Family / Nomenclature
- Official Designation: V40
- Common Names/Nicknames:
- Mini-Frag
- Golf Ball Grenade
- Hooch Popper (Vietnam-era nickname, referring to its use in clearing enemy hooches/bunkers)
- Related Variants: Vietnamese copies (slightly larger, utilizing RGD-5 fuze components)
- Practice Variant: Blue-painted inert body marked “NWM-V40 INERT”
5. Hazards
- Primary Hazard: Fragmentation — the steel body produces approximately 326 individual fragments upon detonation
- Lethal Radius: Approximately 5 meters (16 ft)
- Casualty/Danger Radius: Fragments can be dangerous up to approximately 300 meters (980 ft) from the point of detonation
- Fuze Delay: 4 seconds from lever release to detonation
- Sensitivity Concerns:
- The grenade was issued primed from the manufacturer, meaning the fuze was already installed — increasing the risk if safety mechanisms fail
- Due to its extremely small size, the impact of the striker on the primer was difficult to feel when wearing gloves, making accidental initiation a significant concern
- UXO Considerations: V40 grenades that have been thrown but failed to detonate should be treated with extreme caution. The small size makes them easy to overlook in debris and vegetation. The grenade’s steel body resists corrosion relatively well, meaning UXO examples may retain functionality for extended periods.
- Environmental Degradation: The explosive fill and pyrotechnic delay elements may degrade over time, but the steel body and mechanical fuze components can remain functional for decades.
6. Key Identification Features
- Shape: Spherical (approximately the size of a standard golf ball)
- Overall Height: 6.5 cm (2.6 in), including the fuze assembly
- Body Diameter: 4.0 cm (1.6 in)
- Weight: 136 grams (4.8 oz) — body approximately 78 grams
- Body Material: Machined steel with 326 pre-scored squares pressed into the interior face to produce controlled fragmentation
- Exterior Finish: Olive drab or dark green paint on live variants; blue paint on practice/inert variants
- Markings: Manufacturer markings (NWM) and lot information typically stamped or stenciled on the body
- Fuze Assembly: Features a safety pin with pull ring, a spring-loaded safety lever (spoon), and a retaining safety clip attached to the lever
- Distinctive Features:
- Extremely small size compared to conventional hand grenades
- The safety lever closely contours the spherical body
- A double-acting safety pin requiring rotational torque (7–10 inch-pounds) followed by a pull force (2–6 pounds) for removal
7. Fuzing Mechanisms
- Fuze Type: Pyrotechnic delay, striker-release
- Arming Sequence:
- Remove the safety clip from the safety lever
- Pull the safety pin (requires rotational torque followed by a pull)
- Release the safety lever upon throwing
- The spring-loaded striker rotates to impact the percussion primer
- The primer ignites the pyrotechnic delay column
- Delay Time: Approximately 4 seconds
- Detonation: Upon completion of the delay burn, the detonator initiates the main explosive charge
- Safety Mechanisms:
- Double-acting safety pin (requires rotation and pull)
- Contour-hugging spring-loaded safety lever
- Retaining clip on the safety lever for additional accidental arming prevention
- Self-Destruct/Self-Neutralization: None
- Anti-Handling Features: None (not designed as a booby trap)
8. History of Development and Use
The V40 was developed by NWM de Kruithoorn in the Netherlands during the late 1960s in response to the need for a lightweight, concealable grenade that special operations forces could carry in large quantities. The design philosophy centered on minimizing size to roughly that of a golf ball while maintaining effective fragmentation at close range.
Despite its Dutch origin, the V40 was never adopted by the Netherlands Armed Forces. Its primary users were U.S. special operations units, particularly Navy SEALs and MACV-SOG teams operating in Vietnam from the late 1960s through the early 1970s. The grenade earned its “Hooch Popper” nickname for its effectiveness in clearing confined spaces such as bunkers, hooches, and tunnel complexes. Its small size allowed operators to carry significantly more grenades than with standard-issue fragmentation grenades like the M26 or M67.
The V40 continued in limited service with U.S. special operations forces into the 1980s for close-quarters applications such as room clearing. The Canadian Armed Forces also employed the V40 until at least 2008. However, the grenade’s relatively low explosive power and reduced lethal radius (approximately 5 meters) made it less effective for open-field engagements compared to larger fragmentation grenades, leading to its gradual phase-out from widespread inventory.
During the Vietnam War, Viet Cong and PAVN forces produced copies of the V40, though these were slightly larger and utilized the fuze mechanism from the Soviet RGD-5 grenade.
The V40’s legacy endures in the concept of micro-grenades optimized for special warfare, emphasizing portability and precision over raw destructive force.
9. Technical Specifications
| Parameter | Value |
|---|---|
| Overall Height | 6.5 cm (2.6 in) |
| Body Diameter | 4.0 cm (1.6 in) |
| Total Weight | 136 g (4.8 oz) |
| Body Weight | ~78 g |
| Body Material | Machined steel |
| Fragmentation Pattern | 326 pre-scored squares (interior) |
| Explosive Fill | TNT (exact weight not widely published; estimated ~30–40 g based on body/total weight ratio) |
| Fuze Delay | ~4 seconds |
| Lethal Radius | ~5 m (16 ft) |
| Danger Radius | ~300 m (980 ft) |
| Throwing Range | Greater than standard grenades due to lightweight design |
10. Frequently Asked Questions
Q: Why was the V40 never adopted by the Dutch Armed Forces despite being manufactured in the Netherlands? A: The V40 was specifically designed for a niche market — special operations forces requiring high grenade carriage capacity in a compact form factor. The Dutch Armed Forces had no doctrinal requirement for such a specialized grenade and relied on standard-sized fragmentation grenades for their infantry. NWM de Kruithoorn developed the V40 primarily for the export market.
Q: How many V40 grenades could a soldier carry compared to standard fragmentation grenades? A: Due to its small size (approximately one-third the weight of many standard grenades) and compact spherical shape, a soldier could carry roughly three times as many V40s as standard fragmentation grenades like the M67 in the same volume and weight allocation. This was a significant tactical advantage for reconnaissance and special operations teams.
Q: Why was the V40 considered dangerous when wearing gloves? A: The V40’s extremely small size meant that the mechanical feedback from the striker impacting the primer was very subtle. When wearing thick combat gloves, a user might not feel this feedback, potentially leading to uncertainty about whether the grenade had been properly initiated after lever release. This could result in delayed throwing or dangerous hesitation.
Q: How does the V40’s fragmentation performance compare to the M67 fragmentation grenade? A: The V40 produces approximately 326 fragments from its pre-scored interior, with a lethal radius of about 5 meters. The M67, by comparison, has a lethal radius of approximately 5 meters as well, but a much larger casualty radius (approximately 15 meters) and a significantly greater danger area. At very close ranges (within 3 meters), the V40’s fragmentation density is comparable to larger grenades, but its effectiveness drops off rapidly beyond that distance due to the smaller and lighter fragments.
Q: What was the “Hooch Popper” tactic used in Vietnam? A: U.S. special operations forces, particularly Navy SEALs and MACV-SOG teams, used V40 grenades to “pop” enemy hooches (thatched huts), bunkers, spider holes, and tunnel entrances. The small size allowed the grenade to be tossed into tight openings, and the blast and fragmentation effects within a confined space were sufficient to incapacitate occupants. The small casualty radius also minimized risk to friendly forces positioned nearby.
Q: Could the V40 be used as a booby trap? A: The V40 was not specifically designed for booby-trap use and lacked anti-handling features or variable-delay fuzes. However, like any hand grenade, it could theoretically be employed in improvised booby-trap configurations by rigging the safety lever to release upon disturbance. Viet Cong copies, particularly those using RGD-5 fuze components, may have been adapted for such purposes.
Q: Is the V40 still in use anywhere today? A: The V40 has been largely phased out of military inventories worldwide. The Canadian Armed Forces were among the last known users, retaining the type until at least 2008. While no major military force currently fields the V40 as a standard-issue item, examples may still exist in various stockpiles globally, and UXO encounters remain possible in former conflict zones.
Q: How can a V40 be distinguished from other small spherical grenades? A: The V40 is identified by its very small spherical steel body (approximately golf ball-sized), olive drab or green finish, and the distinctive NWM manufacturer markings. The safety lever closely contours the body, and the safety clip attached to the lever is a notable feature. Practice versions are painted blue with “NWM-V40 INERT” stenciled on the body. The pre-scored interior fragmentation pattern (visible on sectioned examples) is also a key identification feature.