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Steel version
Type N
Housing steel, zinc plated
Pairings
Internal ring steel, hardened
Bearing socket brass
lubrication possible.
Type W
Housing steel, zinc plated
Pairings
Internal ring steel, hardened
Bearing socket steel, zinc plated
with PTFE-insert
self lubricated.
Features of general use:
For general use, and in particular for continuously changing thrust and shock loads in radial and axial plane.
For general use, especially for application under dynamic operating conditions. Load bearing capacitiy than Type N .
Stainless Steel version
Type NH
Housing Stainless Steel
Pairings
Internal ring, hardened,
Bearing socket bronze
lubrication possible.
Type WH
Housing Stainless Steel
Pairings
Internal ring steel, hardened
Bearing socket bronze, with PTFE-insert
self lubricated.
Type WK
Housing Stainless Steel
Pairings
Internal ring Stainless Steel, hardened
Bearing socket Stainless Steel, with PTFE-insert
self lubricated.
As Type N for use in corrosion endangered area.
As Type W for use in corrosion endangered area.
As Type W for use in areas where the highest degree of corrosion resistance is of paramount importance. Such as for instance in the food industry.
Bearing play
Bearing play refers to the amount of play by which the internal ring inside a bearing socket without lubrication can be moved either a radial or an axial plane.
Load applied to obtain the measured results: 100 N at room temperature.
Lubrication
Ball joint heads of type N (lubrication possible) require regular lubrication. On delivery the ball joint heads are not lubricated. The initial lubrication takes place when installed. Within the temperature range of -20 °C to +125 °C, a multipurose grease proved to be adequate. Under extreme conditions a high quality grease such as for instance Gleitmo 805 K should be used. Ball joint heads of the type W (self lubricated) must never be lubricated. The internal ring moves on a PTFE-insert of the bearing socket.
Operating temperature
Ball joint heads of the type N (lubrication possible) can be used within the temperature range -50 °C to +200 °C and if use with a high temperature grease even higher. Ball joint heads of the type W (self lubricated) can be used in the temperature range of -50 °C bis +200 °C. In general use at higher temperature is possible, but this will of course shorten the working life of the head.
Load values
Load values are bearing related values, arrived at from the raw material data of the basic material of construction used. The latter is used to determine the choice of a ball joint head for a given load. These might, however, have to be reduced to meet the requirements of particular circumstances.
Static load values Co in kN
Co gives the permitted radial static load which can be applied to a ball joint head with the weakest cross section without causing permanent deformation. The Co-values quoted in the catalogue table have been calculated, based on the corresponding raw material specification. Subsequently a random number of the ball joint heads was stress tested at room temperature. Each and every time the stress tests were based on using up to 80 % before the onset of deformation thus leaving a safety factor of 1.25. The static value Co is used to obtain the permissible axial load which in general is limited by the mounting strength of the internal bearing. To obtain the maximum axial load Fa tests were carried out at the largest permissible slant angle and the results obtained are shown in the table below: Fa = 0.4 Co for type N Fa = 0.2 Co for types NH, W, WH, WK
Dynamic load value C in kN
They help to evaluate the length of life for ball joint heads when use under dynamic conditions.
