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Graco 166037 Nut Jam

Graco 166037 Nut, Jam is a genuine stainless-steel locking nut designed for securing adapters on piston mounting studs in Graco displacement pump assemblies.

  • Thread size: 5/8–11 UNC-2B
  • Material: Stainless steel for durability
  • Used in: Graco Displacement Pump Model 224349 (Series C)
  • Ensures proper piston and rod alignment under heavy use

$165.93
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Compatibility & Key Details for 166037 Jam Nut

Compatible Machines

This part is used within specific Graco displacement pump assemblies. Confirm by matching your pump number in the sprayer’s parts manual.

  • Graco Displacement Pump Model 224349 (Series C) — installed on select industrial spray rigs and systems that use this pump module

Product Summary

Graco 166037 Nut, Jam is a genuine OEM locking (jam) nut used to secure the adapter on the piston mounting stud in certain displacement pump assemblies, helping prevent loosening from vibration during operation.

Specifications

Part Number 166037
Type Jam nut (locking nut)
Thread 5/8–11 UNC-2B
Material Stainless steel (for heavy-duty pump use)
Typical Location Piston mounting stud / adapter lock point within displacement pump
Assembly Example Displacement Pump Model 224349 (Series C)
OEM Status Genuine Graco replacement part

Fitment Guidance

  • Match the pump model in your sprayer’s manual—if it lists 166037 at the adapter/piston interface, this is the correct jam nut.
  • When servicing the displacement pump, always torque the jam nut per the service manual and inspect mating threads.

Frequently Asked Questions

It locks the adapter onto the piston mounting stud in the displacement pump, preventing loosening from vibration and helping maintain correct rod/piston alignment.

Check your sprayer’s parts manual for the displacement pump section. If your pump assembly lists part 166037 at the adapter/piston stud interface (often near the connecting rod/adapter), it is the correct jam nut.

5/8–11 UNC-2B.

Clean and inspect mating threads, apply the manufacturer-specified thread treatment if required, and torque to the value in the service manual. Recheck after initial run-in.

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