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End clearance on piston rings depends on ring design, material andapplication. The following end clearances are provided as a standard for hydraulic cylinder applications. When using iron piston rings, it is crucial to use the correct groove design for proper performance of the cylinder. Please use the following guidelines when cutting an iron piston ring groove.

GROOVE WIDTH: To permit the ring to slide freely into the groove, the groove must be at least 0.001” wider than the maximum piston ring width with a tolerance of +0.003”/-0.000”.

GROOVE DEPTH: Grooves must be at least 0.015” deeper than the maximum radial wall thickness of the piston ring with a tolerance of +0.003”/-0.000”. This is to avoid any possibility of the ring bottoming in the groove when the ring is compressed to its working diameter.

RADIAL CLEARANCE: The radial clearance between the cylinder bore and piston should be less than 1/3 of the radial wall thickness of the piston ring to ensure sealing effectiveness.

Iron Material | 0.175 in Cross Section | Piston Seal

O-rings as elastic loops that seal static and dynamic applications. They are used to seal the space between cylinders, pistons, pipes and tubes and can be made from various materials.

75 Durometer | Fluorocarbon Material | 2 3/4 in Nominal Inner Diameter | 1/8 in Cross Section | O-Ring

Features

• Pressure range varies according to diametral clearance
• Temperature range of -20 °F to -400 °F

Wear rings provide a hard-wearing surface that protects the cylinder walls and the piston rod from scoring and abrasion. By maintaining alignment and reducing side loads, these rings facilitate smoother piston movement and lower friction levels.

Nylon Material | 3 1/2 in Nominal Inner Diameter | 1/8 in Cross Section | Wear Ring

Features

• Protection Against Wear
• Reduced Friction
• Extended Cylinder Life
• Operational Efficiency

4 Gland Kit

Molded in urethane, this wiper is flexible enough to easily snap into a groove yet tough enough to handle difficult rod wiping applications.

Urethane Material | 28 MM Inner Diameter | Wiper

1.375 in clevis pin with 0.056 in grooves machined into each end to fit two retaining rings. Retaining rings are not included.

Pivot pins with grooves are meant to be used on a hydraulic cylinder that extends and retracts a telescoping lift arm.

3 Bronze Rod Glands

Style ST wiper rings are precision molded from 90A durometer urethane. Flexible enough to easily snap into a groove yet tough enough to handle difficult rod wiping applications. “V” tagged wipers are constructed of fluorocarbon.

90A Durometer | Urethane Material | 1 1/4 in Nominal Inner Diameter

Features

• Flexible enough to snap into a groove
• Wipers are constructed of fluorocarbon

Style ST-XL wipers are molded from premium urethane and are direct replacements for Style “ST” or “D” wipers. The outside diameter of the ring has a crush lip providing extra interference in the groove. A bead on the shoulder stops contaminates from entering through the groove. The inside diameter is ribbed to prevent pressure traps between the wiper and rod seal.

94A Durometer | Urethane Material | 4 1/4 in Nominal Inner Diameter

Features

• Crush lip to provide extra interference
• Bead on the shoulder to keep contaminants out
• Ribbed ID to prevent pressure traps

Molded in 90A urethane, this seal was developed to be used as a head seal and to replace an o-ring and a back-up. Its symmetrical one-piece design reduces the risk of installation damage and back-up blow-out.

90A Durometer | Urethane Material | 2 3/4 in Nominal Inner Diameter | 1/8 in Cross Section | Head Seal