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Graco 103181 Washer

The Graco 103181 Washer Lock (External Tooth) is an OEM hardware piece used for secure fastening in vibration-prone assemblies of Graco sprayers and proportioners.

  • Fits Reactor E-Series: E-30, E-XP2
  • Fits Reactor R2-Series: R2-E30, R2-H30, R2-H40, R2-H50, R2-HXP2, R2-HXP3
  • Also used in GH-Series: GH-2, GH-4

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OEM External Lock Washer Details & Compatibility

Compatible Machines

  • Graco Reactor E-Series: E-30, E-XP2
  • Graco Reactor R2 Series: R2-E30, R2-H30, R2-H40, R2-H50, R2-HXP2, R2-HXP3
  • Graco GH Series: GH-2, GH-4

What is the Graco 103181 Washer?

The Graco 103181 is a genuine OEM Washer, Lock (External Tooth) used to secure fasteners in high-vibration assemblies on select Graco sprayers and proportioners. Its external teeth bite into the mating surface to help prevent loosening over time.

Typical use cases include fastening sub-assemblies on Reactor E-Series, Reactor R2 models, and certain GH units where OEM hardware specifications call for an external lock washer.

Key Specifications

Part Number 103181
Part Name Washer, Lock – External Tooth
Brand / Quality Graco OEM replacement hardware
Common Platforms E-Series (E-30), E-XP2, R2-Series (R2-E30, R2-H30/H40/H50, R2-HXP2/HXP3), GH-2, GH-4
Function Prevents nut/bolt loosening by providing external-tooth locking action under vibration
Fitment Guidance Confirm washer size (ID/OD & thickness) against your unit’s assembly diagram before installation

Installation & Usage Notes

  • Install with the external teeth facing the mating surface so the teeth can bite and lock.
  • Replace any deformed, corroded, or flattened lock washers to maintain clamp load.
  • Use with OEM-specified hardware only; mixing sizes or types can compromise the joint.
  • Torque fasteners to the specifications in your Graco service manual.

Frequently Asked Questions

It’s commonly used on E-30, E-XP2, and several R2 variants. Always verify your exact assembly in the parts manual, as hardware can vary by revision or subassembly.

External-tooth washers (like 103181) have teeth on the outside edge for greater surface bite, which is often preferred where more locking action is required. Internal-tooth versions grip around the fastener head and are used in different applications.

For best results and to maintain equipment integrity, use Graco OEM hardware. Non-OEM substitutions may not match the required size, hardness, or tooth profile and could loosen prematurely.

Keeping a small pack of spares is smart—these are inexpensive but critical. Replace anytime the washer shows wear, corrosion, or loss of tooth definition.

Follow the torque values in your model’s Graco service manual for the specific bolt size and grade. The lock washer enhances retention but does not replace correct torque.

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