We manufacture rings in a diameter range of 0.5″ to 73″ in various widths and radial wall combinations. We stock rings of many configurations for fast delivery. Rings are available in several Joint Designs and Materials. We also provide Application Assistance in ring usage and design. Several coatings can be applied to improve the function of the ring in various environments.
Most of our rings are manufactured using our Accu-Seal process. Accu-Seal is a CNC cam free non-round machining process that produces the outside diameter, inside diameter and the ring width. Ring features such as chamfers, corner radii and OD profiles like taper faces, barrel faces and grooves can be easily added. This process assures a high degree of circularity and perpendicularity between the diameters and the ring sides. Varying the amount the ring is turned out of round will control the ring’s tension and free state diameter.
Application Assistance
Ring Description
A ring specification should include this information:
A. Minimum cylinder diameter
B. Nominal width of ring
C. Radial wall
D. Joint Style
E. Material
Fits and Tolerances
Generally rings will perform best when allowed to float free in the piston groove. Ring groove widths should be .001 – .005 larger than the ring maximum width. Clearance is also necessary under the ring. The ring should not be allowed to bear on the bottom of the groove when in use. This clearance should also accommodate for any radii at the bottom of the groove and the axial tolerance of the piston in the bore (maximum tolerance between the piston OD and the cylinder bore diameter). After considering these two factors and additional 0.030 / 0.050 is typical in sizing the radial wall. We can assist you in dimensioning a ring to fit your groove or recommend the groove size to accommodate a standard size ring. Rings are end gapped for perfect fit while allowing for thermal expansion in normal hydraulic applications.
Coatings
All iron rings are manganese phosphate coated. This provides an anti-friction anti-scuff coating that absorbs and retains lubricant to prevent rusting and aid in ring break in. Other coatings are available for special applications and environments. These include plating of chrome, tin, niflor, etc.
Piston Ring Warranty
Hydra-Seal Inc. warrants all its products manufactured or repaired to be free of material or workmanship defects for a period of 12 months from the date of shipment. All defective claims must include our job numbers and will be subject to our inspection. Based on that evaluation we will repair, replace or credit the defective parts at our discretion. The warranty does not apply to products that were subject to improper application, installation or misuse. Hydra-Seal, Inc. is not liable for any cost associated with removal, installation, lost time, lost profit, incidental or consequential damages, direct or indirect. No other warranties will apply whether expressed or implied.