Graco 100018 – Washer, Lock, Spring (Genuine OEM)
Compatible Machines
The Graco 100018 Washer, Lock, Spring is used across multiple Graco lines. Confirm against your parts manual for exact placement.
- System 8000 (HE-LP): 223-260, 223-261
- GrindLazer Scarifiers: 571002 (9 HP), 571003 (13 HP)
- Gas Hydraulic Airless: GH1015, GH2075, GH2560, GH3640, GH5030
- HydraMax Sprayers: 225, 300, 350
What is the Graco 100018 Washer Lock Spring?
The Graco 100018 is a helical lock-spring washer designed to help prevent nuts/bolts from loosening due to vibration and cyclic loads common in airless sprayers, line stripers, and surface-prep equipment. Using the correct OEM lock washer helps maintain clamp force, protects threads, and keeps assemblies secure.
Key Specifications
| Manufacturer / Brand |
Graco |
| OEM Part Number |
100018 |
| Description |
Washer, Lock, Spring (split/helical type) |
| Typical Use |
Secures fasteners against vibration; maintains preload |
| Common Locations |
Frame/mount brackets, pump/manifold hardware, engine plate, handle assemblies (varies by model) |
Why Use the OEM Lock Washer?
- Correct hardness and spring characteristics for Graco applications
- Consistent fit with existing bolts/nuts and seat surfaces
- Helps prevent loosening that can lead to leaks, misalignment, or premature wear
Fitment & Installation Tips
- Match the washer to the bolt size and location shown in your parts diagram.
- Install under the nut/bolt head with the split edge providing spring tension.
- Inspect the old washer for flattening or cracking; replace if deformed.
- Torque hardware to the specification in the machine manual.
Frequently Asked Questions
Yes—100018 is a genuine Graco Washer, Lock, Spring. Using OEM hardware ensures correct spring tension and durability in high-vibration assemblies.
Cross-check your model’s parts list/diagram. If your machine appears in the Compatible Machines above—or the diagram calls out part 100018 at the relevant fastener—it’s the correct washer.
While a generic washer may fit, OEM Graco ensures proper hardness, thickness, and resilience. For critical assemblies (pump/mounting points), OEM is strongly recommended.
Common locations include frame brackets, engine or pump plates, manifold/pump fasteners, and handle or accessory mounts. Exact use varies by model—see your parts diagram.
Inspect hardware during routine service. Replace the washer if it’s flattened, cracked, or shows loss of spring tension. Always re-torque to spec after service.
