Graco 100016 Lock Washer

The Graco 100016 Lock Washer is a small but essential hardware part that prevents bolts and screws from loosening under vibration—used across multiple Graco sprayer models for secure assembly.

Part Number: 100016
Type: Lock Washer (Fastener Hardware)
Fits: ST, 295ST, GH733, RoadLazer, HydraMax 225 & many others
Purpose: Keeps screws and panels tightly secured

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Description

About Graco 100016 Lock Washer & Compatibility

Compatible Machines

The 100016 is a widely-used lock washer found across many Graco sprayers and finishing systems. Verified examples from OEM parts lists and supplier catalogs include:

ST & 295ST Series airless sprayers
GH733 (Hydra Sprayer family)
RoadLazer systems 231571 / 231572
Models 223-260, 223-261
Model 224-626
HydraMax 225
Model 226970
GH733 variant 230975
Gas line & driver families: 231-133, 231-141, 231-149, 231-150, 231-151, 231-152, 231-159
Models 231114, 231378
Models 232900, 232901, 233797, 233815
1900 Zip-Spray 246649
Series: 300, 350, 3900, 3540, 3050
Wall-mounted units & many electrostatic airless systems (various)

What is the Graco 100016?

The Graco 100016 Lock Washer is a small fastening component used under a screw or nut to resist loosening from vibration and load. It helps maintain clamping force on housings, panels, and sub-assemblies in Graco sprayers and related equipment.

Function: provides anti-vibration security and helps retain fastener preload
Placement: under screw/bolt heads or nuts in housing and bracket assemblies
Use cases: pump enclosures, control panels, frames, guards, and mounts

Key Details

Part Number	100016
Item Type	Lock Washer (fastener hardware)
Typical Location	Under screw/bolt heads or nuts on housings, brackets, and panels
Compatibility Note	Used on many Graco models; verify on your machine’s parts list/exploded view
Sold As	Single piece (check your assembly count before ordering)

How to Verify Fit on Your Machine

Locate your sprayer’s exact model and serial on the nameplate.
Open the official parts list/exploded diagram for your model.
Look for washer items: confirm the line calling out 100016.
Check quantity required (often more than one per assembly).

Frequently Asked Questions

Likely, but confirm on your model’s parts diagram. If the diagram lists 100016, you’re good. If not, check if a different washer size or style is specified for that position.

Quantities vary by assembly. Many housings use multiple screws—count the fasteners in your diagram and order extras to cover spares or future maintenance.

If dimensions and hardness match the original spec, a generic can work. For warranty and safety, use OEM-spec parts where possible and never upsize/undersize the washer ID/OD or thickness.

Fasteners that back out, panel vibration, rattling noises, or misaligned covers. Inspect and replace as needed to prevent further wear.

Clean mating surfaces, seat the washer flat under the head or nut, torque to spec, and re-check after initial run-time. Replace any damaged screws or threads before reassembly.