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Graco 101333 Spring Lock

The Graco 101333 Spring Lock Washer keeps bolts and nuts tight under heavy vibration, ensuring secure assembly in Graco pump lower sections.

  • Part Number: 101333
  • Type: Spring Lock Washer, 9/16 in
  • Used In: Pump lower and fluid-section assemblies
  • Prevents: Fastener loosening under vibration

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Spring Lock Washer 101333 — Key Details

Compatible Machines / Assemblies

  • Graco pump “4-Ball Lowers” assemblies where a 9/16-12 UNC capscrew is used (service manual references show 101333 as the matching spring lock washer).
  • Other Graco pump lower housings / fluid-section modules that specify 101333 in their parts list.
  • Any unit that calls for a 9/16 in spring lock washer under a capscrew or nut in the lower/fluid-section fastening stack-up.
  • Always confirm with your machine’s parts manual: if the bill of materials lists 101333, this is the correct washer.

Product Overview

The Graco 101333 is a Spring Lock Washer used to help prevent fasteners from loosening under vibration and load. It is installed beneath a bolt head or nut to maintain tension and resist back-off in pump lower and related assemblies.

Quick Specs

Part Number 101333
Type Spring Lock Washer (lock-washer, spring-type)
Nominal Size 9/16 in (paired in assemblies with 9/16-12 UNC capscrews)
Function Maintains clamping force; resists loosening from vibration/impact
Typical Location Pump lower / fluid-section fastener stack-ups (beneath bolt head or nut)
Packaging Sold individually (quantity as required by assembly)

Fit & Selection Tips

  • Match the washer to the specified part number 101333 in your parts list.
  • Verify the mating fastener is 9/16-12 UNC when used in pump lower assemblies.
  • Replace any deformed, corroded, or work-hardened lock washers during service.

Frequently Asked Questions

It fits any Graco assembly where the parts manual explicitly lists 101333. Because it’s a standard fastener, it appears in multiple pump lower / fluid-section assemblies. Check your exact model’s manual to confirm.

It is used with 9/16 in fasteners in relevant assemblies (commonly paired with 9/16-12 UNC capscrews).

Replace during any pump lower service if the washer shows flattening, cracking, corrosion, or loss of spring tension. Always follow the maintenance steps in your unit’s service manual.

Yes, it is typically supplied individually. Order the quantity required for your assembly.

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