Product Name: O-Ring, Autoline™ II Nozzle Assembly (.69 x .81 x .06) – Part No. 05138821

Description:
This component is a precision O-ring seal specifically designed for the Autoline™ II series abrasive waterjet cutting head assembly . It serves as a critical static sealing element that prevents high-pressure water and abrasive leakage between the stationary components of the cutting head.

The O-ring has nominal dimensions of .69 inches inner diameter (ID), .81 inches outer diameter (OD), and .06 inches cross-section (CS). It is manufactured as an AS568 standard size -017 O-ring and is typically made from high-durability polyurethane or Buna-N rubber material, selected for its excellent wear resistance and sealing properties in abrasive waterjet environments .

According to the official parts diagram for the Autoline™ II Abrasive Nozzle Assembly (Table 12-46), this O-ring is listed as Item 8 and is used in a quantity of 1 per assembly . It is specifically used in the nozzle body assembly (P/N 20453958) .

Applications:

• Provides static sealing between the nozzle body and cutting head components in Autoline™ II abrasive waterjet systems

• Prevents high-pressure water and abrasive particle leakage during cutting operations

• 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

• Critical sealing component for cutting head assemblies using .043 inch wear inserts

Features:

• Standard AS568 Size -017: Conforms to industry-standard dimensions for reliable replacement fitment

• Polyurethane / Buna-N Construction: Provides excellent wear resistance and sealing durability in abrasive waterjet environments

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

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

• OEM Quality: Direct replacement for KMT/Acustream part number 05138821 and cross-referenced as WK000043

• Dimensions: 0.69" ID × 0.81" OD × 0.06" CS

Maintenance:

Failure Diagnosis (When to Replace):

• External Water or Abrasive Leakage: Visible water weeping or garnet dust escaping from the nozzle body area indicates O-ring failure requiring immediate replacement

• 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 cutting head assembly is disassembled

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 to the O-ring 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

• Component Relationships: In the Autoline™ II assembly, this O-ring (Item 8) works in conjunction with other sealing components including O-Rings 05081518 (Item 11, 12) and 20445476 (Item 9)

• 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

• Wear Gloves: Use clean gloves during installation to prevent natural oils and contaminants from contacting the new seal

Cross-Reference Information:

• KMT / AccuStream #: 05138821

• Cross-Reference: WK000043

• AS568 Size: -017

• Material: Polyurethane / Buna-N

• Dimensions: 0.69″ ID × 0.81″ OD × 0.06″ CS

• Quantity per assembly: 1

• Used in: Autoline™ II Abrasive Nozzle Assembly (Table 12-46, Item 8)

• Associated Assembly Components: Wear Insert (.043 x .156), Nozzle Body (20453958), Guard (05087168), O-Rings (05081518, 20445476)