Wiper H844
H844 wipers are protective seals made of high-quality polyurethane for hydraulic cylinders in stationary and mobile industrial installations with high protection requirements. The H844 profile ensures dense and uniform contact with the rod around the entire circumference, without excessive pressure that would wear the rod surface — an important balance for cylinders with high-precision hard-chromed rods, where restoring the surface costs as much as a new cylinder. They are the answer for applications where complete cleaning of the rod during every cycle matters. The complete profile, dimensions, and equivalent codes are available on the hydsealstore shop, with matching recommendations.
Technical Characteristics and Specifications for H844 Wipers
Industrial-grade polyurethane selected for its superior resistance to mechanical wear and dimensional stability at varying temperatures. It operates between -30°C and +100°C, with stable behavior throughout the entire range, without visible aging during the first years of operation. The dimensions comply with European profiling standards, compatible with a wide range of industrial cylinders. The calibrated Shore A hardness ensures a balance between cleaning force and minimal rod wear. Resistance to ozone and UV radiation makes it suitable for cylinders exposed to direct sunlight or nearby welding sources. The other sealing components of the cylinder are available in the range of hydraulic seals.
Industrial Applications and the Level of Protection Provided
H844 is chosen for industrial presses where splashes of processed material and lubricants reach the rod, lifting systems in factories and warehouses with industrial dust and fine metal particles, material handling installations with cylinders in continuous operation, and applications with long planned intervals between overhauls. The dense-contact profile is better than standard wipers when complete cleaning of the rod during every cycle is essential — a typical requirement for production lines where internal contamination of the fluid is not acceptable. An incomplete cleaning cycle means particles in the circuit and pump wear. Other profiles are available in hydraulic wipers.
Selection and Installation Criteria for H844 Wipers
The groove must be thoroughly cleaned before installation — any trace of the old seal or hardened grease deforms the H844 profile during insertion. The lip must face outward — check that it is not twisted during installation; a lip with residual twisting does not clean uniformly and allows particles to pass through on one side. Confirm that the H844 profile matches the dimensions of your cylinder groove — on older machinery, the same nominal dimensions may have different tolerances, so measure with a caliper. Lightly lubricate before initial startup. The guide rings that complete the system are available in guide rings.
Advantages of Purchasing H844 Wipers from Hydraulic Seals Store
H844 wipers are designed for applications where rod protection and the removal of contaminants during every retraction are important. Hydraulic Seals Store offers this polyurethane profile for different hydraulic cylinder dimensions, including industrial applications with repetitive operation.
The correct size is determined by the rod diameter and installation groove. It is recommended that the installation area be cleaned before installation and that the wiper lip not be deformed during insertion. If you are not sure whether the H844 profile fits your cylinder, you can send us the dimensions for verification.