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Graco 100859 Screw

The Graco 100859 Screw is a genuine OEM headless, full dog point screw designed for secure assembly in Graco Topper Units. Ideal for maintaining equipment reliability and precise alignment.

  • Part Type: Headless Screw (Full Dog Point)
  • Thread Size: No. 10-24 x 1/4"
  • Fits: Multiple Graco Topper Units (226013, 226018, 244637, 204490, 25P544)
  • OEM Quality: Ensures proper fit and long-lasting performance

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Product Overview – OEM Graco 100859 Screw (Headless, Full Dog Point)

Compatible Machines

This OEM Graco 100859 headless screw appears in the parts breakdown for the following Topper Units (grease dispense units with pneumatic pump elevator):

  • Model 226013 – 50:1 Fire-Ball® Pump Topper Unit
  • Model 226018 – 50:1 President® Pump Topper Unit
  • Model 244637 – 75:1 President® Pump Topper Unit
  • Model 204490 – Topper Unit (without pump or hose kit)
  • Model 25P544 – 36:1 GT 750 Pump Topper Unit

Key Specifications

Part Number 100859
Type Screw, headless, full dog point
Thread / Size No. 10-24 x 1/4"
Typical Location Inductor/follower plate assembly hardware (Topper Units)
Authenticity Genuine Graco OEM fastener for proper fit and safety

Why Choose the OEM 100859

  • Correct thread/length for the specified assemblies—no guesswork.
  • Headless, full dog point design aids precise alignment during installation.
  • Maintains equipment integrity under vibration and high-duty cycles.

Frequently Asked Questions

We recommend the OEM Graco fastener only. The headless, full dog point geometry and exact thread/length are specified for Topper Unit assemblies; generic substitutions may not seat correctly or could loosen under load.

It appears in the inductor/follower plate assembly section. Exact location can vary by model; consult your unit’s parts diagram to identify the reference callout for 100859.

Match your machine’s model number with its official Graco manual/parts list and confirm 100859 appears in the bill of materials. If unsure, contact support with your model and serial.

The manual lists No. 10-24 x 1/4" with a full dog point tip. Do not overspec longer set screws; they may bottom out or damage mating parts.

Clean the threads, apply a suitable threadlocker if specified by the manual, and torque evenly. Re-check fasteners after initial run-in, especially on high-vibration systems.

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