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Graco 100187 Nut

Graco 100187 Nut is a durable OEM hex nut designed for multiple Graco sprayers and striping machines. Ideal for securing control boxes, manifolds, and frame assemblies.

  • Part Number: 100187
  • Type: Hex Nut (5/16 in, OEM specification)
  • Used In: Ultra Max II, Mark Series, ThermoLazer, GH Roof Rigs
  • Purpose: Provides reliable fastening for vibration-prone assemblies

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Graco 100187 Nut — Specs, Uses & Compatibility

Compatible Machines

The Graco 100187 Nut appears across multiple Graco platforms. Verified instances include:

  • Ultra Max II 695, 795, 1095, 1595 (Standard / ProContractor / IronMan series)
  • Mark Series: Mark IV, Mark V, Mark X
  • ThermoLazer: 200, 200TC, 300TC & ThermoLazer ProMelt (select assemblies)
  • GH Series Roof Rigs (Gas-Hydraulic airless sprayers; selected models/assemblies)
  • OEM Striping / Skid-Mount Packages (specific assemblies)

What is the Graco 100187 Nut?

The Graco 100187 is an OEM hex nut used to secure components in Graco sprayers and specialty equipment. It commonly appears in control boxes, chassis/frames, burner/manifold brackets, and hydraulic assemblies.

Key Specifications

Part Number 100187
Type Hex Nut (OEM service fastener)
Nominal Size 5/16 in (appears as 5/16 in; some assemblies specify 5/16-24 thread)
Typical Locations Control box hardware, burner/manifold brackets, frame/chassis hardware, hydraulic module mounts
OEM Fit Designed for Graco equipment; use per model parts list

When to Choose

  • Replacing missing or worn fasteners identified as 100187 in your Graco parts diagram
  • Restoring proper clamping force in control box, burner tube, frame or hydraulic sub-assemblies
  • Maintaining OEM hardware consistency for safety and vibration resistance

Frequently Asked Questions

Check your unit’s parts manual. If the diagram lists 100187 at the required location, this is the correct nut. Serial-range notes in the manual take priority over general lists.

Manuals typically note a 5/16 in hex nut; some assemblies specify 5/16-24 and/or a grade (e.g., Grade 5). Follow the specification printed in your model’s manual for that assembly.

Use OEM-spec hardware whenever possible. If substituting, match the thread, grade, and material exactly; improper substitutes can loosen under vibration or damage mating parts.

Common callouts include control box hardware (Ultra Max II / Mark series), burner/manifold brackets (ThermoLazer), and hydraulic module mounts (GH Roof Rigs). Verify in your diagram.

Start threads by hand to avoid cross-threading, torque evenly, and use the locking method (lock nut/washer, threadlocker) specified in your manual. Re-check torque after initial run-in.

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