Seal and Repair Kits
Seals and repair kits are indispensable for various mechanical systems and equipment maintenance and repair operations. Seals, which come in a wide range of materials and designs, are critical for preventing leaks and maintaining the integrity of hydraulic, pneumatic, and mechanical systems. These seals effectively block the escape of fluids, such as oil or gas, and play a vital role in ensuring system efficiency and longevity. Repair kits are curated collections of replacement parts, including seals, gaskets, O-rings, and other essential components. They are designed to simplify the repair and maintenance process by providing all the necessary parts in one package, facilitating quick and cost-effective fixes. Whether it's a hydraulic system in heavy machinery or a simple household appliance, seals and repair kits are crucial for ensuring the reliability and longevity of mechanical systems by preventing leaks and facilitating efficient repairs.
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CONTROLAIR-HC/HD-2-FM-PORTION R431003852. Pressure-regulating component for setting consistent operating pressure in air circuits. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. Sold by us as a factory-authorized Aventics distributor.
$1,922.55
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD-LEFT R431004868. Pneumatic regulator providing controlled, repeatable downstream pressure for actuators and tools. Specified in air-prep panels, machine inlets, and per-actuator branch lines to control downstream pressure. In stock through authorized Aventics distribution with full factory warranty.
$166.45
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD-LEFT R431004870. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$166.45
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD-RIGHT R431004871. Pneumatic regulator providing controlled, repeatable downstream pressure for actuators and tools. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$54.80
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD-RIGHT R431004872. Pressure-regulating component for setting consistent operating pressure in air circuits. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$52.65
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD-RIGHT R431004873. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$166.45
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD/HG R431006418. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Genuine Aventics part shipped through authorized distribution.
$253.84
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD/HG R431006419. Pneumatic regulator providing controlled, repeatable downstream pressure for actuators and tools. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Genuine Aventics part shipped through authorized distribution.
$261.73
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-2-FM R431000729. Pressure-regulating component for setting consistent operating pressure in air circuits. Specified in air-prep panels, machine inlets, and per-actuator branch lines to control downstream pressure. In stock through authorized Aventics distribution with full factory warranty.
$539.68
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-2-FM R431002659. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. Stocked through our authorized Aventics distribution channel.
$901.56
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-2-FM R431002660. Pneumatic regulator providing controlled, repeatable downstream pressure for actuators and tools. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Stocked through our authorized Aventics distribution channel.
$73.43
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-2-FM R431002661. Pressure-regulating component for setting consistent operating pressure in air circuits. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Stocked through our authorized Aventics distribution channel.
$34.52
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-2-FM R431002662. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Stocked through our authorized Aventics distribution channel.
$122.85
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-PIPE R431006914. Pneumatic regulator providing controlled, repeatable downstream pressure for actuators and tools. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$165.09
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-PORTION R431006913. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$81.70
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD2/HC2 R431006889. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. Available from us as an authorized Aventics distributor with manufacturer warranty.
$19.67
Available for Purchase
Subject to factory lead times
CONTROLAIR-HE-2-MAJOR R431006522. Pressure-regulating component for setting consistent operating pressure in air circuits. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. Authorized Aventics distribution; manufacturer warranty included.
$448.11
Available for Purchase
Subject to factory lead times
CONTROLAIR-HE-2-X R431005991. Pressure-regulating component for setting consistent operating pressure in air circuits. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Stocked through our authorized Aventics distribution channel.
$307.27
Available for Purchase
Subject to factory lead times
CONTROLAIR-SH-2-DUAL-PORTION R434004351. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Specified in air-prep panels, machine inlets, and per-actuator branch lines to control downstream pressure. Stocked through our authorized Aventics distribution channel.
Requires Quote
Available for Purchase
Subject to factory lead times
CONTROLAIR-SH-3 R431006556. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. Authorized Aventics distribution; manufacturer warranty included.
$414.37
Available for Purchase
Subject to factory lead times
Conversion KIT F/A2H Actuator R431005999. Compressed-air component used in factory automation and machine-build pneumatics. Used in factory automation, machine assembly, and OEM equipment with pneumatic subsystems. Stocked through our authorized Aventics distribution channel.
$381.55
Available for Purchase
Subject to factory lead times
Conversion KIT F/POSITIONER R431005741. Air-actuator positioner providing precise stroke control on regulating valves or cylinders. Used to set and hold the position of regulating valves, dampers, and actuated cylinders in process control. Authorized Aventics distribution; manufacturer warranty included.
$566.60
Available for Purchase
Subject to factory lead times
Cotter PIN 0.06X0.38-303/(18-8SS) R431002570. Air-system component used in industrial machinery, automation cells, and OEM equipment. Configured with 0.06″ × 0.38″ dimensional reference. Found across machine builds, automated production lines, and OEM compressed-air equipment. Sold by us as a factory-authorized Aventics distributor.
$2.91
Available for Purchase
Subject to factory lead times
Cotter PIN 0.06X0.50-303/(18-8SS) R431002541. Compressed-air part used across automation, packaging, and material-handling machinery. Configured with 0.06″ × 0.50″ dimensional reference. Common across OEM machinery and industrial automation that relies on compressed-air actuation. Sold by us as a factory-authorized Aventics distributor.
$2.53
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD-2-FM-PORTION R431003852. Pressure-regulating component for setting consistent operating pressure in air circuits. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. Sold by us as a factory-authorized Aventics distributor.
$1,922.55
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD-LEFT R431004868. Pneumatic regulator providing controlled, repeatable downstream pressure for actuators and tools. Specified in air-prep panels, machine inlets, and per-actuator branch lines to control downstream pressure. In stock through authorized Aventics distribution with full factory warranty.
$166.45
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD-LEFT R431004870. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$166.45
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD-RIGHT R431004871. Pneumatic regulator providing controlled, repeatable downstream pressure for actuators and tools. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$54.80
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD-RIGHT R431004872. Pressure-regulating component for setting consistent operating pressure in air circuits. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$52.65
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD-RIGHT R431004873. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$166.45
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD/HG R431006418. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Genuine Aventics part shipped through authorized distribution.
$253.84
Available for Purchase
Subject to factory lead times
CONTROLAIR-HC/HD/HG R431006419. Pneumatic regulator providing controlled, repeatable downstream pressure for actuators and tools. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Genuine Aventics part shipped through authorized distribution.
$261.73
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-2-FM R431000729. Pressure-regulating component for setting consistent operating pressure in air circuits. Specified in air-prep panels, machine inlets, and per-actuator branch lines to control downstream pressure. In stock through authorized Aventics distribution with full factory warranty.
$539.68
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-2-FM R431002659. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. Stocked through our authorized Aventics distribution channel.
$901.56
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-2-FM R431002660. Pneumatic regulator providing controlled, repeatable downstream pressure for actuators and tools. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Stocked through our authorized Aventics distribution channel.
$73.43
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-2-FM R431002661. Pressure-regulating component for setting consistent operating pressure in air circuits. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Stocked through our authorized Aventics distribution channel.
$34.52
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-2-FM R431002662. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Stocked through our authorized Aventics distribution channel.
$122.85
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-PIPE R431006914. Pneumatic regulator providing controlled, repeatable downstream pressure for actuators and tools. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$165.09
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD-PORTION R431006913. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. In stock through authorized Aventics distribution with full factory warranty.
$81.70
Available for Purchase
Subject to factory lead times
CONTROLAIR-HD2/HC2 R431006889. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. Available from us as an authorized Aventics distributor with manufacturer warranty.
$19.67
Available for Purchase
Subject to factory lead times
CONTROLAIR-HE-2-MAJOR R431006522. Pressure-regulating component for setting consistent operating pressure in air circuits. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. Authorized Aventics distribution; manufacturer warranty included.
$448.11
Available for Purchase
Subject to factory lead times
CONTROLAIR-HE-2-X R431005991. Pressure-regulating component for setting consistent operating pressure in air circuits. Common on assembly stations, hand tools, and process equipment requiring stable air pressure. Stocked through our authorized Aventics distribution channel.
$307.27
Available for Purchase
Subject to factory lead times
CONTROLAIR-SH-2-DUAL-PORTION R434004351. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Specified in air-prep panels, machine inlets, and per-actuator branch lines to control downstream pressure. Stocked through our authorized Aventics distribution channel.
Requires Quote
Available for Purchase
Subject to factory lead times
CONTROLAIR-SH-3 R431006556. Air-pressure regulator maintaining a stable downstream supply pressure to pneumatic equipment. Used at the supply point of pneumatic equipment to set safe, consistent operating pressure for cylinders and tools. Authorized Aventics distribution; manufacturer warranty included.
$414.37
Available for Purchase
Subject to factory lead times
Conversion KIT F/A2H Actuator R431005999. Compressed-air component used in factory automation and machine-build pneumatics. Used in factory automation, machine assembly, and OEM equipment with pneumatic subsystems. Stocked through our authorized Aventics distribution channel.
$381.55
Available for Purchase
Subject to factory lead times
Conversion KIT F/POSITIONER R431005741. Air-actuator positioner providing precise stroke control on regulating valves or cylinders. Used to set and hold the position of regulating valves, dampers, and actuated cylinders in process control. Authorized Aventics distribution; manufacturer warranty included.
$566.60
Available for Purchase
Subject to factory lead times
Cotter PIN 0.06X0.38-303/(18-8SS) R431002570. Air-system component used in industrial machinery, automation cells, and OEM equipment. Configured with 0.06″ × 0.38″ dimensional reference. Found across machine builds, automated production lines, and OEM compressed-air equipment. Sold by us as a factory-authorized Aventics distributor.
$2.91
Available for Purchase
Subject to factory lead times
Cotter PIN 0.06X0.50-303/(18-8SS) R431002541. Compressed-air part used across automation, packaging, and material-handling machinery. Configured with 0.06″ × 0.50″ dimensional reference. Common across OEM machinery and industrial automation that relies on compressed-air actuation. Sold by us as a factory-authorized Aventics distributor.
$2.53
Available for Purchase
Subject to factory lead times
FAQS
- A pneumatic cylinder seal and repair kit is a pre-packaged set of all the replacement seals, O-rings, wear bands, and other soft components needed to rebuild a pneumatic cylinder and restore it to like-new performance. Over time, the seals inside a pneumatic cylinder wear due to friction, heat, chemical exposure from lubricants or process contaminants, and millions of operating cycles. Worn seals cause air leaks (reduced force and increased air consumption), loss of speed control, erratic motion, and inability to hold position under load. A seal and repair kit contains the piston seal (the primary seal between the piston and the bore wall that prevents air from bypassing the piston), the rod seal (that prevents air from leaking past the rod where it exits the cylinder), the rod wiper (that scrapes contaminants off the rod as it retracts to prevent them from damaging the rod seal), wear bands or guide rings (that keep the piston and rod centered in the bore to prevent metal-to-metal contact), and any O-rings and backup rings used in the cylinder's internal sealing system.
- Replace pneumatic cylinder seals when you observe signs of seal degradation that affect the cylinder's performance. Air leakage is the most obvious sign — listen for hissing at the rod end (rod seal failure) or at the exhaust port when the cylinder is pressurized and stationary (piston seal failure allowing air to bypass the piston). Reduced force output means the piston seal is allowing air to blow by, reducing the effective pressure acting on the piston. Slow or erratic motion indicates seal friction has changed or internal bypassing is causing uneven pressure distribution. Inability to hold position under load suggests the piston seal or rod seal can no longer maintain a pressure differential. Visible oil or moisture on the rod surface may indicate rod seal degradation. A general guideline is to establish a preventive maintenance schedule based on the manufacturer's recommendations and the operating environment — high-cycle applications (millions of cycles per year), dirty environments, and high-temperature applications require more frequent seal replacement. Having seal kits on hand for your critical cylinders prevents extended downtime when a cylinder does fail.
- Pneumatic cylinder seals are made from various elastomer and polymer materials selected to match the operating conditions. Nitrile rubber (NBR / Buna-N) is the standard general-purpose seal material for pneumatic cylinders — it provides good abrasion resistance, compatibility with petroleum-based lubricants in the compressed air, and reliable performance across a temperature range of approximately -20°F to 200°F. Polyurethane provides superior abrasion resistance and higher pressure capability than nitrile, making it a popular choice for piston and rod seals in high-cycle applications. PTFE (Teflon) provides the lowest friction, widest chemical resistance, and widest temperature range, but is harder and less conformable than elastomers — it is used as backup rings, wear bands, and in composite seal designs. FKM (Viton) provides broader chemical resistance and higher temperature capability than nitrile, for applications with aggressive lubricants or elevated temperatures. Silicone rubber is used for extreme low-temperature applications. The seal material in the repair kit is matched to the original cylinder specification to ensure proper fit and performance.
- Rebuilding a pneumatic cylinder is a straightforward maintenance procedure when you have the correct seal kit and follow proper procedures. First, depressurize the cylinder completely and disconnect all air lines. Remove the cylinder from the machine if necessary for access. Disassemble the cylinder according to the manufacturer's instructions — for tie-rod cylinders, remove the tie-rod nuts and slide the end caps off the barrel; for threaded-body cylinders, unscrew the end caps. Remove the piston and rod assembly from the bore. Carefully remove all old seals, O-rings, wear bands, and wipers from the piston, rod gland, and end caps, noting their positions and orientations. Clean all metal components thoroughly and inspect for scoring, scratching, or corrosion damage on the bore wall, piston, rod, and rod bearing — any significant surface damage will cause rapid wear of new seals. Install the new seals from the kit in the correct positions and orientations, using the proper seal installation tools to avoid damaging the seals during installation. Lubricate all seals with clean pneumatic lubricant before reassembly. Reassemble the cylinder, reconnect air lines, and test for proper operation and leak-free performance.
- Identifying the correct seal kit requires knowing the cylinder manufacturer, model or series, bore size, and rod size. The cylinder's nameplate or body markings typically include the manufacturer name, model number, bore diameter, and stroke length — this information is used to cross-reference to the correct seal kit part number in the manufacturer's catalog or through Centro's product specialists. The bore size determines the diameter of the piston seal and wear bands, while the rod size determines the diameter of the rod seal, rod wiper, and rod gland O-rings. If the nameplate is unreadable or missing, you can measure the bore diameter (inside diameter of the barrel), the rod diameter, and the dimensions of the existing seals to identify the correct replacements. Always verify that the kit contents match the original seal configuration before installing — compare each new seal to the corresponding old seal removed from the cylinder for size, profile shape, and material. Using an incorrect seal kit can result in leaks, premature failure, or damage to the cylinder bore or rod surface.