Graco 164381 Piston Stud

The Graco 164381 Piston Stud is a genuine OEM fastener used in select Graco pump/fluid sections. Verify fitment with your model’s parts diagram before ordering.

Part No.: 164381
Role: Secures piston/rod assembly for alignment & seal life
Status: Model-specific compatibility not confirmed — verify
Sold individually; follow OEM torque specs

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Description

Precision Pump Hardware – Installation & Fitment Notes

The Graco 164381 Piston Stud (also referenced as Stud Piston) is an OEM fastener used inside select Graco fluid/pump assemblies. Confirm fitment against your machine’s parts diagram before ordering.

Compatible Machines

Overview

The Graco 164381 Piston Stud is a genuine OEM component that secures elements of the piston/rod assembly within applicable Graco pump sections. Using the correct stud helps maintain alignment, sealing integrity, and long-term pump performance.

Key Details

Part Number	164381
Part Name	Piston Stud / Stud Piston
Type	Pump / Fluid-Section Fastener (OEM)
Typical Location	Piston/Rod assembly within the pump (see your model’s exploded diagram)
Fitment Status	Model-specific list not confirmed — verify using OEM parts manual
Packaging	Sold individually
Notes	Match to pump revision/kit; torque per OEM specification

Why This Part Matters

Maintains piston alignment for consistent pressure and spray pattern
Supports seal life by keeping the assembly correctly clamped
OEM quality helps ensure durability and reliable operation

How to Confirm Fit

Locate your sprayer’s OEM parts manual or exploded pump diagram.
Find the piston/rod (fluid section) callout and confirm 164381 is listed.
Check pump revision/kit number; some models changed hardware across revisions.
If unsure, share your exact model and serial to verify before purchase.

Frequently Asked Questions

Fitment depends on your pump revision and model. Check your OEM parts list for the piston/rod assembly and confirm that 164381 is specified for your exact machine and revision.

Always follow the OEM torque spec for the piston/rod fasteners and install in a clean, debris-free environment. Inspect mating threads and replace related seals/gaskets if your manual calls for it during reassembly.

Substitutions are not advised unless explicitly cross-referenced by Graco. Even minor differences in length, thread, or material can impact pump performance and seal life.

Some models bundle the Piston Stud within a pump repair kit. If your diagram references a kit, order that kit so you receive all required matched components and seals for the repair.