Product Name: O-Ring -121 / Size -215 Buna-N O-Ring (Part No. 202685)

Description:
This component is a standard O-ring seal, specifically the AS568 size -215, manufactured from nitrile rubber (Buna-N) with a 70 durometer hardness rating . It is designed for use in the MAXJET 5 series waterjet cutting head assembly . The O-ring serves as a static or dynamic seal, preventing high-pressure water leakage between mating components such as the nozzle body, mixing chamber, and cutting head housing.

Applications:

• Seals the interface between cutting head components in MAXJET 5 waterjet nozzles 

• Provides leak-proof sealing in high-pressure water circuits within the cutting head assembly

• Suitable for abrasive waterjet cutting systems operating at ultra-high pressures (typically 60,000 PSI and above)

• Compatible with OMAX MAXJET 5 and MAXJET 5i nozzle systems

Features:

• AS568 Standard Size -215: Industry-standard sizing ensures precise fit in designated O-ring grooves 

• Nitrile/Buna-N Material: Excellent resistance to water, hydraulic fluids, and common water treatment additives; good abrasion resistance

• 70 Durometer Hardness: Balanced hardness provides effective sealing while maintaining flexibility for installation 

• OEM Direct Replacement: Cross-references with OMAX #202685 and AccuStream equivalent parts 

• Critical Consumable Component: Designed for periodic replacement to maintain leak-free operation

Maintenance:

Failure Diagnosis:

• External Water Leakage: Visible water weeping from cutting head connections indicates O-ring wear or damage

• Hardening or Cracking: Deteriorated O-rings may become brittle, cracked, or permanently flattened

• Compression Set: If the O-ring no longer returns to its original shape, it has lost sealing effectiveness

• Nicks or Cuts: Physical damage during assembly or from abrasive particles compromises sealing

Replacement Procedures:

• Always Replace During Service: O-rings are single-use consumable components. Replace with a new O-ring whenever the cutting head assembly is disassembled 

• Clean Groove Thoroughly: Before installing a new O-ring, ensure the gland groove and mating surfaces are completely clean, dry, and free from debris, old seal residue, corrosion, or scratches 

• Inspect Groove Condition: Check the groove for sharp edges, burrs, or damage that could cut or abrade the new seal 

• Lubrication: Apply a thin, uniform coating of manufacturer-recommended high-pressure grease or silicone-based lubricant to the O-ring during installation to prevent pinching, rolling, or damage during assembly 

• Avoid Twisting: Ensure the O-ring is not twisted or pinched in the groove after installation. Use tapered installation tools to prevent distortion 

• Proper Sizing Verification: Verify the replacement O-ring matches the original dimensions (AS568 -215) exactly. An O-ring that is too thick or too thin will not seal properly 

• Full Depressurization: Always fully depressurize the waterjet system and follow lockout/tagout procedures before disassembling the cutting head

• Preventive Replacement Schedule: It is standard practice to replace this O-ring during scheduled cutting head maintenance or whenever the nozzle is serviced 

• Storage: Store spare O-rings in a cool, dry environment (15–25°C, humidity <65%) away from direct sunlight, ozone sources, and chemicals to prevent premature aging 

• Cross-Reference Part Numbers: Also known as O-Ring -121 (size designation) and OMAX #202685