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.
