Graco 205516 Piston Stud

The Graco 205516 Piston Stud is a genuine OEM fastener designed for heavy-duty Graco pumps. It ensures secure piston alignment and smooth operation within the pump section.

Fits: 30:1 Bulldog, GH 533, and 63:1 King pumps
Part Number: 205516
Maintains pressure stability and pump performance
Durable construction for industrial spraying applications

$423.58

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Description

Piston Stud Overview & Compatibility

Compatible Machines

This Graco 205516 Piston Stud is used in heavy-duty pump sections on the following Graco systems (verify against your parts manual):

Graco 30:1 Bulldog pump systems
Graco GH 533 (Gas Hydraulic) units
Graco 63:1 King pneumatic airless sprayers

The Graco 205516 Piston Stud (also listed by some suppliers as “Stud, Piston”) is a critical internal fastener that secures/locates the piston assembly within the pump. Using the correct OEM-spec stud helps maintain prime, pressure stability, and long service life in high-ratio industrial sprayers.

Key Features

OEM part number: 205516
Designed for high-pressure, high-ratio pump sections (30:1 and 63:1 families)
Precision fit to support piston alignment and smooth reciprocation
Optimized for durability under continuous professional use

Specs & Details

Part Number	205516
Part Name	Graco 205516 Piston Stud
Compatible Families	30:1 Bulldog • GH 533 • 63:1 King
Function	Secures/locates piston assembly within pump section
Notes	Always cross-check with your unit’s parts list and serial range before ordering

What’s Included

1 × 205516 Piston Stud

Installation & Care Tips

Depressurize system and follow lock-out/tag-out procedures before service.
Inspect mating piston/rod threads and replace any worn components during rebuild.
Use manufacturer-approved lubricants/compounds where specified; avoid over-torquing.
After assembly, prime with compatible fluid and verify for leaks/pressure stability.

Frequently Asked Questions

Yes—this 205516 Piston Stud is commonly listed for 30:1 Bulldog, GH 533, and 63:1 King pump families. Always confirm against your exact model/serial parts list before purchase.

Some catalogs describe the 205516 as a “piston valve” or use alternate naming. Functionally, it’s the stud that secures/locates the piston assembly. Use the part number (205516) as the authoritative reference.

It’s good practice to inspect the piston, rod, packings, and seats. If there’s wear or thread damage, plan a full seal/packing refresh to restore performance. Refer to your pump’s rebuild kit recommendations.

Check your model’s illustrated parts list (IPL) using the serial range. Match the pump section and item index to 205516. If unsure, share your model/serial and we’ll double-check before shipping.