Product detailed description

Merkel U-Ring NA 300 is a single-acting piston seal – a polyurethane U-cup with an asymmetrical profile: the outer (dynamic) lip is offset and on the inner diameter the seal is press-fitted into the piston groove. It is designed for standardized housings, among others according to ISO 5597,, and offers very good static and dynamic sealing.

Application: Earth-moving and construction machinery, support cylinders, presses.

Technical parameters: material polyurethane 94 AU 925 (94 Shore A), pressure up to 40 MPa, speed up to 0.5 m/s, temperature −30 °C to +110 °C in HL/HLP hydraulic oils and mineral lubricating greases, HFA/HFB +5 to +50 °C, HFC −30 to +40 °C, water +5 to +40 °C, HETG −30 to +60 °C, HEES −30 to +80 °C, HEPG −30 to +40 °C. Tolerances: bore D H9, groove root diameter d h11.

Size: bore (piston) diameter D 360 mm, groove root diameter d 330 mm, seal height H 20 mm, groove width L 21 mm (+0,2), profile 15 mm, lead-in chamfer C 7.5 mm.

Dimensions: 360x330x20, 360-330-20, 360/330/20, 360 x 330 x 20 mm, 330x360x20, 330-360-20, 330/360/20, 330 x 360 x 20 mm.

Also searched as: U-cup, seal, U-cups, seals, hydraulic U-cup, hydraulic seal, Manschette, Dichtung, piston U-cup seal, piston seal, Kolbendichtung, Nutring, U-cup seal, U-ring, NA300, NA 300, Merkel, Simrit, Freudenberg, PU, polyurethane, AU, ISO 5597.

Manufacturer designation: NA 300, NA300, Article No. 21845.