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Different versions of lubrication nipples - zerk fittings
Lexicon: D
Different versions of lubrication nipples - zerk fittings
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Different versions of lubrication nipples - zerk fittings

A lubrication nipple, also known as grease nipple, is a small connector fitted to a wheel bearing via a screw thread. The lubrication nipple is used to feed the required lubricant into the bearing so that the device or machine keeps running smoothly.

There are different types of lubrication nipples [zerk fittings], such as cone shaped, flat and ball-type lubrication nipples. The properties of these different models are standardized in accordance with DIN standards. For example, cone shaped lubrication nipples, have a tapered insert thread according to DIN 71412 and are suitable for both manually and mechanically operated grease guns. Flat lubrication nipples (according to DIN 3404), on the other hand, have a fine thread for screwing in and are intended for lubrication points with a large lubricant volume. Ball-type lubrication nipples (standardised according to DIN 3402) are rarely used these days. They have a tapered thread and require a grease gun coupler with a non-positive fit.

Lubrication nipples in a variety of versions
There are different types of lubrication nipple, such as conical, flat and ball-type lubrication nipples. The properties of the individual forms are standardised according to DIN . Conical lubrication nipples, for example, have a tapered insert thread according to DIN 71412 and are suitable for both manually and mechanically operated grease guns. Flat lubrication nipples (according to DIN 3404), on the other hand, have a fine thread for screwing in and are intended for lubrication points with a large lubricant volume. Ball-type lubrication nipples (standardised according to DIN 3402) are rarely used these days. They have a tapered thread and require the lubricator nozzle to have a force-locking connection. 

TENTE Casters with lubrication nipples
TENTE heavy-duty castors are equipped with a dust cover with an integrated lubrication nipple. This ensures that the castors keep running on a permanent basis. Special solutions according to individual customer specifications are also available on request.