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Graco 100109 Lock Washer

The Graco 100109 Lock Washer is a genuine OEM hardware part designed to prevent loosening of fasteners caused by vibration and heavy use. Perfect for maintaining tight, secure assemblies in professional sprayers and line stripers.

  • Part Number: 100109
  • Type: Lock Washer (OEM)
  • Used In: Graco LineLazer 3000, Ultra 433
  • Function: Prevents bolt and nut loosening
  • Category: Hardware & Fasteners

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Genuine Graco 100109 Lock Washer — Specs & Compatibility

Compatible Machines

This Graco 100109 Lock Washer is referenced in official Graco parts lists for the following equipment:

  • Graco LineLazer 3000 (per LineLazer 3000 Instructions/Parts manual)
  • Graco Ultra 433 Airless Paint Sprayer (per Ultra 433 service/parts manual)

Overview

The Graco 100109 Lock Washer secures fasteners against loosening from vibration and rotation. It’s an OEM part engineered for durability and fit within Graco assemblies, helping maintain proper torque and long-term reliability.

Key Specifications

Part Number 100109
Part Type Lock Washer (external “shake-proof” style is specified in some assemblies; size may vary by application)
Category Fasteners & Hardware (OEM)
Typical Use Secures bolts/nuts in high-vibration areas (engine mounts, frames, electrical panels, brackets)
Sold As Individual washer (quantity per machine varies by assembly)

Fitment Notes & Installation Tips

  • Match the washer to the bolt size and location specified in your parts diagram.
  • Install with the correct orientation and apply the manufacturer’s torque for the fastener.
  • When replacing hardware, inspect bolts, nuts, and mating surfaces for wear or damage.
  • Use genuine Graco hardware for consistent material hardness and fit.

Frequently Asked Questions

It helps prevent fasteners from loosening due to vibration and load changes, maintaining proper clamp force and alignment of parts.

Check your unit’s official parts manual/diagram. Look for part number 100109 in the hardware list or assembly callouts for your model and revision.

Not always. Some assemblies specify external, shake-proof styles and particular bolt sizes (e.g., 5/16). Follow the exact specification shown for your assembly.

For safety and fit, use OEM Graco hardware. If a substitute is necessary, match size, thickness, hardness, and tooth profile to the specification.

Quantity varies by assembly. For example, some LineLazer 3000 assemblies call out four. Verify the quantity in your model’s parts list.

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