Graco 100020 Lock Washer

The Graco 100020 Lock Washer is a genuine OEM fastener designed to prevent bolt loosening in Graco sprayers and pumps, ensuring secure assembly and durability.

Part Number: 100020
Material: High-tensile steel
Used In: GMAX, Ultra Max, and Reactor 2 Series
Function: Prevents vibration-induced loosening

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Description

Graco 100020 Lock Washer – Reliable Fastening Component

The Graco 100020 Lock Washer is a genuine OEM component designed to secure bolts and prevent loosening caused by vibration in high-performance Graco equipment. It ensures tight, durable fastening in pumps, sprayers, and mechanical assemblies.

Compatible Machines

This lock washer is used across a wide range of Graco Airless Paint Sprayers and Reactor Systems to maintain stability and secure assembly. Below are some of the models it fits:

GMAX 3900 (Lo-Boy & Hi-Boy)
GMAX 5900 (Lo-Boy & Hi-Boy)
GMAX 7900 (Lo-Boy & Hi-Boy)
GMAX 5900HD & GMAX 7900HD
Ultra Max 695
Ultra Max 1595
Graco Reactor 2 E-Series (E30, E10, E20)
System 8000 Models (223-260, 223-261)
231-052 Upright Cart Airless Sprayer
231-077 & 231-085 Lo-Boy Cart Sprayers

Product Features

Part Number	100020
Manufacturer	Graco
Category	Lock Washer / Fastener Component
Usage	Prevents loosening of bolts in pump and sprayer assemblies
Material	High-tensile steel (corrosion resistant)

Frequently Asked Questions

It secures bolts or fasteners in place, preventing them from loosening under vibration or load — critical in Graco sprayers and Reactor systems.

Yes, the 100020 Lock Washer is an authentic OEM Graco part, ensuring perfect fit and reliable performance.

It may fit other machines with matching dimensions, but for guaranteed compatibility, it is recommended only for Graco equipment.

Summary

The Graco 100020 Lock Washer is a small yet essential component for maintaining assembly integrity in Graco sprayers and pumps. Its durable build and OEM fit make it a reliable part for long-lasting performance.