Page 29 - HydraulicSealsCatalog

27
American Packing Wear Rings are glass filled nylon. The high compressive strength and load bear-
ing capabilities of this material meet or exceed that of most metals used for wear rings. The use of
these non-metallic wear rings totally eliminates metal-to-metal contact and the subsequent galling
and scoring of cylinder bores and rods. These wear rings readily ingest harmful metal flakes, burrs
and small chips. They will not generate contamination as is common with metallic wear rings. They are compatible with
all common hydraulic oils, water emulsions, water glycol, and phosphate ester fluids. Operating temperature to 350° F.
Butt cut – standard stocking configuration.
Formula for Calculating Piston Wear
Ring Grooves
1. (C) Max. Groove Dia. = (A) Min. Bore - 2 (Max.
Wear Ring C/S). (C) Tolerance = + .000/- .005
2. (B) Max. Piston Dia. = [(C) Min. Groove + 2
(Min. Wear Ring C/S)] - 2 (Min. Radial
Clearance of .005) (B) Tolerance = + .000/- .005
3. (D) Groove Length = Actual Part Ht. + .010 (D)
Tolerance = + .010/- .000
Notes:
The piston diameter (B) will not correspond to diameters called out for
the piston seals. Additional clearances are required for wear ring use. Be
sure the entire outside diameter of the piston is no larger than (B). Be
sure the piston seal compound is considered to prevent extrusion of the
piston seal with the new increased diametral clearance.
Wear Ring Piston Installation Data