Hydraulic Wiper & Dust Seals

Wiper seals—also called scrapers, dust seals or excluders—are mounted at the outer end of a hydraulic cylinder rod gland. Their job is to scrape dirt, moisture, ice, abrasive particles and other contaminants from the rod surface before the rod retracts into the cylinder. Without an effective wiper, contamination enters the seal package, damages the rod seal lip, scores the rod surface and accelerates wear of all internal components. A wiper is one of the lowest-cost components in a hydraulic cylinder but one of the most important for long service life. DOP, ZHM and EM are common metric wiper profiles. DOP is a double-lip wiper that provides both scraping action on the outside and a secondary sealing lip on the inside to retain lubricant. ZHM is a metal-cased wiper with a robust scraping lip for heavy-duty construction and mining equipment. EM wipers are all-elastomer designs used in general industrial and mobile hydraulics. MYA is a low-profile wiper commonly used in compact pneumatic and light hydraulic cylinders. GA and DKB are metal-reinforced dust seals with an integral rubber scraping lip. They combine the structural retention of a metal case with the flexibility of an elastomer wiper. These are common in agricultural machinery, excavators, loaders and other equipment exposed to mud, sand and crop debris. The metal case provides a solid press-fit in the gland and resists deformation under impact. Our wiper range covers rod diameters from 6 mm to 400 mm in NBR, FKM and TPU materials. We supply standard DOP, ZHM, EM, MYA, GA and DKB profiles as well as custom designs. Proper wiper selection depends on the contamination level, rod diameter, gland geometry, temperature and whether a secondary sealing lip is desired.