Graco 102040 Lock Nut

The Graco 102040 Lock Nut is an OEM hex nut designed to secure parts on sprayer frames, pumps, and brackets, preventing loosening under vibration. Ideal for maintaining long-term stability and safety in Graco spray systems.

OEM Graco quality for precise fit
Resists vibration and loosening
Used in multiple Graco sprayers and stripers
Durable construction for heavy-duty use

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Description

Product Overview – Graco 102040 Lock Nut (OEM)

Compatible Machines

This OEM Graco 102040 Lock Nut appears across many Graco sprayers and line-striping systems. Verified examples include:

Magnum X5 — Series B, C, D
Pro Plus A30 — Model 16E664
Portable Hydra Sprayer — Model 224-617
Portable Hydra Sprayer — Model 231-157
RoadLazer Line Striper Compressors — 231571 (1-pump), 231572 (2-pump)
Line Driver — 231-151 (4.0 HP), 231-152 (5.5 HP)
Airless Sprayer — 232735

Note: This fastener is used in numerous assemblies (pump brackets, guards, manifolds, frames). If your model isn’t listed above, check its parts diagram—this nut shows up on many variants.

Key Details

Part Number	102040
Part Type	Nut, Lock (Hex) — OEM Graco
Typical Use	Prevents loosening under vibration; secures threaded joints in sprayer frames, pump/motor brackets, manifolds, and guards.
Weight (approx.)	0.01 lb (each)
UPC (common listing)	633955382909

Why Choose Genuine Graco

Perfect fit and thread tolerance for Graco assemblies
Vibration resistance to help maintain clamp load
Durability under high-duty jobsite use

How to Verify Fit

Open your model’s parts diagram and search for 102040.
Match the sub-assembly (e.g., pump bracket, frame, guard) where the nut is called out.
Confirm quantity needed—many diagrams use multiple 102040 nuts.

Frequently Asked Questions

Yes. It’s an authentic OEM Graco lock hex nut designed for Graco sprayers and line-striping systems.

It is listed for Magnum X5 Series B, C, and D. For other Magnum models, check their specific parts diagrams to confirm 102040 is called out.

Common callouts include pump/motor brackets, manifolds, guards, and frame fastener points—locations subject to vibration where a lock nut is preferred.

Look up your sprayer’s manual/diagram, search for part 102040, and verify the assembly and quantity. If needed, contact support with your model and serial.

A lock nut generally provides resistance to loosening already. Follow your model’s service manual; apply threadlocker only if specified for that fastener location.