The housings are produced from grey cast iron in compliance with DIN EN 1561, external surface painted RAL 5010 Gentian Blue and the machined surfaces are treated with an anti-corrosion agent. Threaded for grease nipple or automatic lubrication and grease drain hole which is sealed with a metal threaded plug at the factory but can be removed subject to application. Housings based on ISO 113/II: 1994 and DIN 736: 1984 to DIN 739: 1984.