R wz. 42 Sidolówka hand grenade

Simple models and renders based on the Polish ww2 partisan/resistance fragmentation hand grenade which was unofficially but commonly dubbed as "Sidolówka" cause of the grenades bodied looking like cans of Sidol a metal cleaning agent by the company Henkel which was sold at the time, the earliest R wz. 42 grenades were actually made out of repurposed Sidol cans and later newly manufactured sheet metal bodies were made in shape to be that of Sidol cans, therefore, the reason behind the nickname becomes apparent.

The first R wz. 42 Sidolówka grenades were built in Warsaw by professors of the Warsaw University of Technology led by Jan Czochralski and partially based on the earlier Polish grenade of the time the ET wz. 40 Filipinka.

The grenade used a P-42 friction fuze which was designed by two pre-war Polish munition works engineers, engineer Józef Michałowski and pyrotechnician Władysław Pankowski. This type of fuze thanks to its simplicity became commonly used in other forms of grenades, such as in satchel charges and grenades with cast metal bodies.

About 350,000 of these grenades were made from 1942 to 1947 in a multitude of underground Polish resistance/partisan factories and workshops. The main partisan organization that built them was Armia Krajowa or AK for short.

The grenade's main claim to its limited fame is from its use in the battles of Operation Tempest such as in the Warsaw Uprising.