Graco 100422 Lock Washer

The Graco 100422 Lock Washer is a genuine OEM internal shake-proof washer designed to keep fasteners secure under vibration. Ideal for multiple Graco sprayers and pump assemblies.

Part Number: 100422
Type: Lock Washer (3/4")
Compatible With: 390 PC Cordless, LineLazer ES 500, Graco Elevator & Pump Supports
Purpose: Prevents bolt loosening under load
Material: Durable metal – OEM quality

$10.13

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Description

Compatible Machines

The Graco 100422 Lock Washer is used across multiple Graco assemblies. Confirm with your machine’s parts diagram before ordering.

Graco 390 Cordless – Model 25T943
Graco LineLazer ES 500 – Models 25U546, 25U547, 25U548
Graco Elevators / Pump Supports – Models 204385 (Series C), 207408 (Series A), 205332 (Series A)

Overview & Key Details

Genuine Graco lock washer designed to help secure fasteners and resist loosening under vibration or load in airless sprayers, line stripers, and elevator/pump support assemblies.

Quick Specs

Part Number	100422
Part Name	Lock Washer
Type / Function	Prevents fastener loosening from vibration; used in structural and pump/elevator mounts
Typical Size Callout	Listed in Graco literature as an internal shake-proof style for larger fasteners (e.g., 3/4″ class use). Always verify against your model’s parts list.
Compatibility	See Compatible Machines above; may appear in other Graco assemblies—check your specific diagram.

Notes on Fitment

Match the washer to the exact bolt size and location shown in your model’s parts diagram.
If your unit has revisions by series (e.g., Series A/C), ensure you reference the correct series list.
Lock washers are application-specific; do not substitute sizes or styles without verification.

Frequently Asked Questions

Check your Graco parts diagram for the exact position and size callout. The diagram will list 100422 where required. If uncertain, compare the bolt size and the original washer style before purchasing.

Common locations include pump/elevator mounts, frame assemblies, and select LineLazer brackets. It may also appear in other Graco assemblies that experience vibration.

For best reliability, use a genuine Graco part to match thickness, hardness, and style. If a substitute is necessary, match size/style (e.g., internal shake-proof) and material grade exactly and verify torque requirements.

Clean the mating surfaces, align the washer correctly (teeth toward the part as specified), and tighten to the manufacturer’s torque. Re-check after initial run-in if the assembly is subject to heavy vibration.

The 100422 appears in multiple Graco documents beyond the machines listed. Check your unit’s diagram by model number and series. If you share your model/series, we can confirm fitment before you order.