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Graco 103780 Lock Washer

OEM Graco 103780 spring lock washer for 7/16″ bolts—helps prevent loosening under vibration. Fits Crown Imperial multi-stage pumps and select air-motor assemblies; verify against your parts list.

  • Part #: 103780
  • Type: Spring lock washer (helical)
  • Size: Fits 7/16″ fasteners
  • Fits: Crown Imperial pumps (6–14 stage), air-motor assemblies (e.g., 624250)
  • Function: Maintains clamp load; resists back-off

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OEM 7/16″ Spring Lock Washer — Graco Part 103780

Compatible Machines

  • Graco Crown Imperial Series multi-stage pumps (6–11 stage)
  • Graco Crown Imperial Series multi-stage pumps (12–13 stage)
  • Graco Crown Imperial Series multi-stage pumps (14 stage)
  • Graco air-motor assemblies (e.g., Model 624250)

Product Overview

The Graco 103780 is an OEM spring-type lock washer sized for 7/16″ fasteners. It provides tension that helps resist loosening from vibration and dynamic loads in pump and motor assemblies.

Technical Specifications

Part Number 103780
Component Type Spring lock washer (helical)
Fastener Size 7/16″ (fits 7/16″ bolts)
Typical Application Secures bolted joints in Graco multi-stage pumps (Crown Imperial) and air-motor assemblies
Function Maintains bolt preload; helps prevent back-off from vibration/shock
OEM Graco Genuine Part
Package Contents 1 × lock washer (unless otherwise noted by kit)

Key Features & Benefits

  • OEM fit for select Graco pump/motor assemblies
  • Spring tension helps maintain clamp load under vibration
  • Sized correctly for 7/16″ bolts; consistent assembly quality
  • Durable construction for industrial duty environments

Fitment Notes

  • Match the washer to the fastener size: this part is for 7/16″ bolts.
  • Consult your machine’s parts list for the exact washer reference at each location.
  • Replace any flattened, cracked, or corroded lock washers during service.

Installation & Maintenance Tips

  • Install beneath the bolt head or nut with full, flat seating.
  • Tighten to the torque specified in your Graco service manual.
  • Recheck torque after initial run-in if your maintenance procedure calls for it.

Frequently Asked Questions

It’s a spring lock washer for 7/16″ bolts.

It appears in parts lists for Graco Crown Imperial multi-stage pumps (various stage counts) and certain air-motor assemblies (e.g., Model 624250). Always confirm with your exact parts breakdown.

A flat washer does not provide spring tension. To maintain preload in vibrating assemblies, use the specified spring lock washer.

Replace if it’s flattened, cracked, or corroded. In critical joints, replacement at service is recommended.

Torque values are machine-specific. Refer to your Graco service manual for the exact assembly location using this washer.

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