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Graco 100028 Lock Washer

Graco 100028 Lock Washer is a genuine OEM part designed to prevent loosening of bolts and screws under vibration. Ideal for use in Graco proportioners, sprayers, and control systems.

  • Part Number: 100028
  • Type: Lock Washer (hardware fastener)
  • Used In: VRM™, HFR™, VPM, XM™, SaniForce™ systems
  • Function: Secures fasteners for reliable equipment performance
  • Category: OEM Graco replacement part

$46.36
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Overview & Key Details

Compatible Machines / Systems

The Graco 100028 Lock Washer appears across multiple Graco plural-component and process systems. Confirm quantity and placement in your unit’s parts manual.

  • VRM™ Hydraulic Variable-Ratio Proportioners (select assemblies)
  • HFR™ (Hydraulic Fixed Ratio) Proportioners (select assemblies)
  • VPM Variable Proportioning/Metering systems (select panels)
  • XM™ Plural-Component Sprayers (select components)
  • SaniForce™ Pneumatic Control Panels (select components)

Product Summary

Graco 100028 Lock Washer is an OEM hardware fastener used to help prevent loosening from vibration on screws/bolts in Graco industrial spraying and proportioning equipment. It is commonly called out as “WASHER, lock” in Graco parts lists.

Key Specs

OEM Part Number 100028
Part Type Lock Washer (general hardware)
Typical Use Secures fasteners against vibration on panels, manifolds, frames, and control modules
Included In Various system sub-assemblies (quantity varies by model)

Fitment Guidance

  • Verify against the exploded parts diagram for your exact model/serial.
  • Lock washers are often used in multiples; order an extra to cover service needs.
  • Replace whenever a fastener shows looseness, corrosion, or damage after maintenance.

Frequently Asked Questions

Check your machine’s parts manual for “100028 – WASHER, lock”. If listed, it fits that assembly. If not, use the manual’s hardware call-outs to match the correct washer.

It’s a general hardware item specified by Graco for certain assemblies. Always follow your model’s manual to ensure the correct size and quantity.

The quantity varies by model and sub-assembly (often 1–6 pieces). Refer to the exploded diagram for your exact configuration.

Use OEM-specified hardware where possible. Non-OEM washers may differ in hardness or thickness and can compromise clamp load or safety in pressurized systems.

Replace during major service, whenever fasteners are removed, or if signs of wear, deformation, or corrosion are present.

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