No 2 grenade

The No 2 grenade (also known as "Hales Pattern" and "Mexican Pattern") is a percussion cap fragmentation and rifle grenade used by the United Kingdom during World War I.

Country Name Origin Year
United Kingdom - UK (Great Britain) 1907
Country Name Operational Year Retirement Year
United Kingdom - UK (Great Britain) View


The No 2 was created by Marten Hale in 1907. It was first used in the Mexican Revolution and was produced by Cotton Power Company under contract from the Mexican government. France also purchased some as a rifle grenade. The United States also tested the No 2 as a potential grenade, but it was not adopted. When World War I broke out, it soon became obvious that the standard British grenade, the No 1 Grenade, could not be produced fast enough to meet with demand. To help meet supply, the British government purchased all of the No 2 grenades made by the Cotton Powder Company.


However, like the No 1, the No 2 required a special detonator that was similar to the one used in the No 1. This made it even more difficult to get adequate supplies of the No 2 to the troops and further tied up supplies. Arguably, the No 2 made the grenade problem worse for the British, as there had to be separate detonators for the No 1 and No 2 that could only be made by a small group of firms.

Later on, the No 2's explosive was changed to Tonite so that it could accept more common detonators. It is unknown if this actually increased supply.

The grenade was officially declared obsolete in 1920, but it is likely that the No 2 stopped being used by British forces in 1916.

Type Hand grenade
Place of origin United Kingdom
Service history
Used by United Kingdom, Mexico, France
Wars Mexican Revolution, World War I
Production history
Designer Marten Hales
Designed 1907
Manufacturer Cotton Powder Company
Produced 1907-?
Variants Mk II (shorter handle and multiple cloth streamers),
Weight 1 lb (0.45kg)
Filling Tonite
Percussion fuse (ie. impact detonated)

End notes