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The AM43 is a single-acting wiper for hydraulic systems and standard cylinders. The profile is installed around the piston rod and removes contaminants from the rod surface during the retraction movement.
The wiper therefore prevents dirt from travelling further into the installation space via the moving piston rod. Its functional action is provided by a protruding NBR wiper lip.
The AM43 consists of an NBR wiping section and a metal angle ring. The metal reinforcement is made of unalloyed steel according to DIN EN 10139, formerly DIN 1624.
The protruding wiper lip contacts the piston rod. The metal angle ring supports the profile in the installation space and prevents the wiper from twisting during operation.
The wiper lip protrudes from the profile and removes contaminants from the piston rod as it moves into the cylinder. According to the data sheet, the AM43 offers good wiping properties against dirt.
For correct operation, the wiper lip must be combined with a piston rod that has a suitable surface quality. The required rod surface roughness is determined by the specifications of the seal used.
The metal angle ring ensures a good fit of the AM43 in the installation space. The reinforcement also prevents the profile from twisting.
The angle ring offers only a small attack surface for corrosive media. During selection, the medium and the conditions surrounding the metal reinforcement must nevertheless be considered together.
According to the data sheet, the AM43 does not require a pressure relief hole. This allows the profile to be used in an axially open installation space that is easy to manufacture.
The wiper itself is not intended to function as a pressure seal. Its function remains limited to removing contaminants from the piston rod during the retraction movement.
The AM43 is particularly suitable for applications with high stroke speeds. The maximum permissible sliding speed is 1 m/s.
This maximum speed must be assessed in combination with the temperature, medium, piston rod surface quality and other conditions within the application.
The AM43 wiper is intended for hydraulic applications and standard cylinders. The profile has a broad application spectrum and is described as a reliable design for moderately demanding applications in general industry.
The stated advantages include good wiping properties against dirt, suitability for high stroke speeds and an axially open installation space that is easy to manufacture. The AM43 also offers a good price-performance ratio and is manufactured by certified external suppliers.
The wiper lip of the AM43 is made of NBR. The metal angle ring consists of unalloyed steel according to DIN EN 10139, formerly DIN 1624.
The NBR section wipes the piston rod. The metal angle ring supports the fit, prevents twisting and offers only a small attack surface for corrosive media.
The AM43 is suitable for hydraulic oils in accordance with DIN 51524 parts 1-3 and for lubricating oils. The profile can also be used with mineral oil-based lubricating greases.
The flame-retardant hydraulic fluids HFA, HFB and HFC according to VCMA 24317 are also specified. During selection, verify that the applied medium is suitable for the NBR and metal angle ring.
The AM43 has an operating temperature range from -30 to +100 °C. The maximum sliding speed is 1 m/s.
These operating limits are maximum values and may not all be reached simultaneously. Suitability should therefore be assessed using the complete combination of temperature, sliding speed, medium, surface quality and installation conditions.
Consult the valid material data sheet for current information about approvals and certificates. This information depends on the specific compound and therefore cannot be listed exhaustively for every version.
The cylinder housing and piston rod must be provided with chamfers to prevent damage to the wiper. The length and angle of these installation chamfers must correspond to the installation-space drawing.
The piston rod surface roughness must correspond to the specifications of the seal used. The groove flanks require a surface roughness of Ra ≤ 4 µm. The groove base must have a surface roughness of Ra ≤ 2.5 µm.
The AM43 must be installed in an axially open groove. According to the data sheet, this installation space is easy to manufacture.
Deburr sharp edges and provide smooth chamfers and radii. Clean the installation space carefully before installation and remove dust, dirt, metal chips and other contaminants.
Store the AM43 at a temperature below 25 °C. Avoid direct sources of heat, direct sunlight and condensation in the storage area.
The wiper must not be exposed to ozone or ionising radiation. The storage recommendations are based on the revision of ISO 2230 dated 16 September 1992.
First check the required piston rod and axially open groove dimensions. Also verify that the protruding wiper lip and metal angle ring fit the available installation space.
Then assess the temperature range from -30 to +100 °C and the maximum sliding speed of 1 m/s. Check the medium, piston rod surface quality, groove roughness and any compound-dependent approvals.
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