A total of over 400,000 were manufactured between 1953 and 1988.
Sterling built them at their factory in Dagenham for the British armed forces and for overseas sales, whilst the Royal Ordnance Factories at Fazakerley near Liverpool constructed them exclusively for the British military.
Production ceased in 1988 with the closing of Sterling Armaments by British Aerospace/Royal Ordnance.
ROF no longer makes full weapons, but still manufactures spare parts for certified end users.

A Chilean variant was made by FAMAE as the PAF submachine gun but was different externally as it had a shorter receiver lacking the barrel shroud.

Canada also manufactured a variant under license, called the Submachine Gun 9 mm C1 made by Canadian Arsenals Limited.
It's made from stamped metal instead of cast metal and is capable of handling a C1 bayonet, which is only used during public exhibition events and not for combat operations.

A similar weapon, the Sub-Machine Gun Carbine 9 mm 1A1, is manufactured under license by the Indian Ordnance Factory at Kanpur in 1963, along with a Sub-Machine Gun Carbine 9 mm 2A1, manufactured in 1977.
In 2012, it's reported that 5,000 SMGs were made in India.
A total of over 400,000 were manufactured between 1953 and 1988. Sterling built them at their factory in Dagenham for the British armed forces and for overseas sales, whilst the Royal Ordnance Factories at Fazakerley near Liverpool constructed them exclusively for the British military. Production ceased in 1988 with the closing of Sterling Armaments by British Aerospace/Royal Ordnance. ROF no longer makes full weapons, but still manufactures spare parts for certified end users.
A Chilean variant was made by FAMAE as the PAF submachine gun but was different externally as it had a shorter receiver lacking the barrel shroud.
Canada also manufactured a variant under license, called the Submachine Gun 9 mm C1 made by Canadian Arsenals Limited. It's made from stamped metal instead of cast metal and is capable of handling a C1 bayonet, which is only used during public exhibition events and not for combat operations.
A similar weapon, the Sub-Machine Gun Carbine 9 mm 1A1, is manufactured under license by the Indian Ordnance Factory at Kanpur in 1963, along with a Sub-Machine Gun Carbine 9 mm 2A1, manufactured in 1977. In 2012, it's reported that 5,000 SMGs were made in India.
Sterling submachine gun