Product Name: Lock Washer, M10 (Split Lock Washer) – Part No. 10064715

Description:
This component is a standard M10 split lock washer, a critical fastening component used in the hydraulic power package and pump assemblies of waterjet cutting systems . It is a thin, circular fastener with a split (helical) design, typically manufactured from hardened carbon steel or stainless steel with a corrosion-resistant finish .

The primary function of this lock washer is to provide spring tension between the head of a bolt or nut and the bearing surface of the component. When tightened, the washer flattens, exerting a continuous opposing force that prevents the fastener from loosening due to vibration and pressure cycling inherent in waterjet intensifier operation.

This specific lock washer is listed as Item 5 in the official parts diagram for the Hydraulic Pump Assembly (P/N 20498668) and as Item 12 in the Hydraulic Power Package (P/N 72154447), with a quantity of 2 required per assembly . It is used in conjunction with M10 socket head screws (P/N 05037593 or 49883564) .

Applications:

• Secures the hydraulic pump assembly to the mounting frame or manifold block

• Prevents loosening of M10 fasteners under high-frequency vibration and pressure pulsation

• Ensures consistent clamping force on critical components such as the piston pump (05045505) and gear pump (20498626) 

• Used in hydraulic power packages, pump assemblies, and intensifier mounting applications

• Compatible with 60,000-94,000 PSI (approximately 4,137-6,480 bar) waterjet systems

Features:

• M10 Nominal Size: Fits M10 bolts, screws, or studs (10mm diameter)

• Split Helical Design: The open-ended ring provides spring tension to resist loosening from vibration

• High-Strength Material: Manufactured from hardened steel or stainless steel for durability under extreme pressure cycling 

• Corrosion-Resistant Finish: Typically zinc-plated or coated to withstand moisture and hydraulic fluid exposure

• Vibration Resistance: Essential for maintaining fastener torque in high-vibration waterjet environments

• Standard Dimensions: Conforms to industry standards (e.g., DIN 127, ISO 8940) for reliable replacement fitment

Maintenance:

When to Replace:

• Permanent Deformation: If the washer is flattened and no longer provides spring tension (loss of gap), it must be replaced

• Cracking or Splitting: Any visible cracks or splits in the washer material warrant immediate replacement

• Corrosion: Heavy rust or pitting that compromises material integrity

• During Major Overhaul: It is standard practice to replace lock washers whenever the associated fastener is removed during major pump service

• Loss of Clamping Force: If the bolted joint becomes loose during operation, inspect and replace the lock washer

Inspection and Installation Guidelines:

• Full Depressurization (Critical): Before any maintenance, place the main electrical disconnect in the OFF position, fully depressurize both the hydraulic system and the high-pressure water system, and follow lockout/tagout procedures

• Single-Use Recommendation: While lock washers are sometimes reused, replacement with a new washer is recommended for critical high-vibration applications to ensure proper locking action

• Proper Orientation: Split lock washers have no directional orientation; place the washer between the bolt head/nut and the bearing surface (or under a flat washer)

• Torque Compliance (Critical): Tighten the M10 fastener to the specific torque value listed in the equipment service manual using a calibrated torque wrench. The lock washer must be fully compressed to function properly

• Use with Flat Washer: Often used in conjunction with a flat washer (e.g., P/N 49883580) to distribute load evenly across the mounting surface 

• Inspect Fastener Threads: When replacing the lock washer, inspect the M10 fastener threads for damage, galling, or corrosion; replace the fastener if damaged

• Clean Installation: Ensure mating surfaces are clean and free of debris, old sealant, or corrosion before installation

• Storage: Store spare lock washers in a clean, dry environment to prevent corrosion before use

• Cross-Reference Part Numbers: 10064715 is used in Hydraulic Pump Assembly 20498668 (Item 5, Qty 2) and Hydraulic Power Package 72154447 (Item 12, Qty 2)