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Graco 104123 Lock Spring Washer

Genuine Graco 104123 Lock Spring Washer (1/4″). Helps prevent fastener loosening from vibration. Use wherever your parts manual specifies a 1/4″ lock washer.

  • Part #: 104123
  • Type: Washer, Lock Spring
  • Size: 1/4″ (for 1/4-20 hardware)
  • Material: Spring steel / may be stainless per assembly
  • Use: Frames, guards, covers, supports, agitator/drum cover
  • Fit Note: Check your model’s parts list (Ultra Max II, Mark V/X, GMAX II, GH, Magnum—where specified)

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Overview & Key Details

Compatible Machines

This Graco 104123 Lock Spring Washer is a common 1/4″ locking washer used across many Graco assemblies. Always confirm with your model’s parts manual.

  • Ultra Max II series (e.g., 695, 795, 1095, 1595)
  • Mark series (e.g., Mark V HD, Mark X HD)
  • GMAX II & LineLazer frames/supports where 1/4″ fasteners are specified
  • GH gasoline sprayers (selected support/guard/cover sub-assemblies)
  • Magnum contractor units (X5, X7, ProX17, ProX19, ProX21) – where listed in the parts diagram
  • Agitator, drum cover, elevator/pump support and similar sub-assemblies using 1/4-20 screws

What is it?

The Graco 104123 – Washer, Lock Spring is a 1/4″ split lock washer used under a screw head or nut to maintain clamping force and help prevent loosening from vibration in Graco equipment.

Key Specifications

Part Number 104123
Part Name Washer, Lock Spring
Nominal Size 1/4″ (for 1/4-20 fasteners)
Typical Material Spring steel / may be specified as stainless steel in some assemblies
Function Helps prevent fastener loosening due to vibration; maintains preload
Common Use Frames, guards, covers, supports, agitator/drum cover assemblies and general service locations using 1/4″ screws

Cross-Reference & Notes

  • Also described as: Lock Washer, Split Lock Washer, 1/4″ Lock Spring Washer
  • Replace only with equal spec (size/material) to maintain clamping performance
  • Pair with the correct 1/4-20 screw/nut per the parts manual

Frequently Asked Questions

Check your unit’s parts manual or the exploded diagram for the sub-assembly. If it calls out 104123 or a 1/4″ lock washer at that location, this part is the correct replacement.

Many assemblies specify spring steel, while others specify stainless. The correct material is determined by the specific sub-assembly and environment. Match what your manual lists to maintain performance and corrosion resistance.

Under the head of a screw or under a nut in locations subject to vibration—for example, frames, supports, guards, covers, and agitator/drum cover assemblies using 1/4″ hardware.

Place the washer between the fastener and the mating surface (split gap not critical to orientation). Tighten to the torque recommended for your 1/4-20 fastener and application. Replace deformed or corroded washers.

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