Product Name: O-Ring, Autoline™ II Nozzle Assembly (Part No. 05077078)

Description:
This component is a precision O-ring specifically designed for the Autoline™ II abrasive nozzle assembly in high-pressure waterjet cutting systems . It is an AS568 standard size -012 O-ring with nominal dimensions of 0.38 inches inner diameter, 0.50 inches outer diameter, and 0.06 inches cross-section . Manufactured from Buna-N (nitrile) rubber with a 70 durometer hardness rating, this O-ring is engineered for reliable sealing performance in the abrasive waterjet environment .

This O-ring is a critical sealing component in the Autoline™ II abrasive nozzle assembly, which is responsible for mixing abrasive particles (such as garnet) with the high-pressure waterjet before it exits the cutting head . The precise mixing ensures an effective abrasive-water mixture for cutting various materials including metals, stone, glass, and composites .

According to the official parts diagram for the Autoline™ II Abrasive Nozzle Assembly (Table 12-46), this O-ring is listed as Item 11 and is used in a quantity of 1 per assembly . It is specifically used on the wear insert for Autoline PRO cutting head assemblies . Cross-reference part numbers include WK000038  and 05081518 .

Applications:

• Seals the wear insert interface within the Autoline™ II abrasive nozzle assembly 

• Prevents high-pressure water and abrasive leakage between nozzle components

• Used in Autoline™ II series cutting heads for abrasive waterjet systems

• Suitable for 60,000-94,000 PSI (approximately 4,137-6,480 bar) ultra-high pressure waterjet systems

Features:

• AS568 Size -012: Industry-standard dimensions for reliable replacement fitment

• Buna-N Material: Offers excellent resistance to water, abrasion, and the chemicals commonly used in waterjet systems 

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

• Precision-Molded: Manufactured to exact tolerances for proper fit in the designated groove

• Critical Consumable Component: Designed for periodic replacement during nozzle maintenance

• Direct OEM Replacement: Interchangeable with KMT #05077078 and WK000038 

Maintenance:

Failure Diagnosis (When to Replace):

• External Water Leakage: Visible water weeping from the nozzle assembly indicates O-ring failure requiring immediate replacement

• Abrasive Leakage: Garnet dust escaping from the nozzle body joints signals seal degradation

• Pressure Drop: Inability to maintain rated cutting pressure may indicate seal failure

• Visible Damage: During disassembly, inspect the O-ring for nicks, cuts, flattening (compression set), hardening, or cracking. Any visible damage warrants replacement

• Scheduled Preventive Maintenance: Replace this O-ring during scheduled nozzle maintenance or whenever the wear insert is serviced

Inspection and Replacement Guidelines:

• Single-Use Component: The O-ring is a consumable sealing element. Always replace it with a new one whenever the nozzle assembly is disassembled. Do not reuse old O-rings

• Full Depressurization (Critical): Before any maintenance, fully depressurize the waterjet system and follow lockout/tagout procedures

• Clean Installation: Thoroughly clean the O-ring groove and mating surfaces with a soft, lint-free cloth. Remove all debris, old seal residue, and abrasive particles

• Groove Inspection: Inspect the seal groove for nicks, burrs, or damage that could cut or abrade the new seal

• Lubrication: Apply a thin, uniform layer of manufacturer-recommended high-pressure grease or O-ring lubricant during installation to prevent pinching, rolling, or tearing

• Proper Seating: Ensure the O-ring is not twisted and is fully seated in its groove before reassembling mating components

• Torque Compliance: When reassembling the nozzle assembly, tighten retaining components to the specific torque values listed in the equipment service manual

• 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 Information:

• KMT / AccuStream #: 05077078

• WK000038 

• Also cross-referenced as 05081518 

• AS568 Size: -012

• Material: Buna-N, 70 Durometer

• Dimensions: 0.38″ ID × 0.50″ OD × 0.06″ CS

• Quantity per assembly: 1