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Graco 100428 Screw Cap Hex Hd

Graco 100428 Screw, Cap Hex HD is a durable fastening component used in several Graco sprayers and proportioner systems. Ideal for securing assemblies where strength and precision are critical.

  • Part Number: 100428
  • Size: 5/8-11 x 2 in (≈51 mm)
  • Used in: Stand-Mount Proportioners Series A & LineLazer IV 3900/5900
  • Function: Structural hardware, non-fluid part

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Overview & Compatibility for Graco 100428 Screw, Cap Hex HD

Compatible Machines

This hardware fastener appears in multiple Graco equipment parts lists. Always verify against your unit’s parts diagram.

  • Stand-Mount Proportioners – Series A (Models 234931, 234932, 234933, 234934)
  • LineLazer™ IV 3900 / 5900 Auto-Layout Systems

Key Details

Part Number 100428
Official Description Screw, Cap Hex HD
Typical Size (from Graco manuals) 5/8-11 x 2 in (≈51 mm)
Function Structural fastener used to secure assemblies; not a fluid-path component.
Where It’s Listed Appears in select Graco proportioner and LineLazer manuals/parts lists.

Fitment Guidance

  • Match the part number 100428 on your machine’s official parts list or service manual.
  • When replacing, use equal or better grade hardware; follow torque specs in your model’s manual.
  • If your unit’s diagram calls out a different length or thread, select that exact specification instead.

Frequently Asked Questions

Possibly. This screw appears across multiple assemblies. Confirm by checking your machine’s parts diagram for the exact callout 100428. If it’s not listed, it isn’t the correct replacement.

Graco manuals commonly list it as 5/8-11 x 2 in (≈51 mm). Always follow the specification shown in your model’s manual in case your assembly calls for a different length.

No. It’s a hardware fastener used to secure components. It does not contact paint or fluid directly.

Inspect threads, clean mating surfaces, use correct washers if specified, and torque to the value in your model’s service manual. Re-check after first use to ensure proper seating.

Use the exact specification shown in your manual. If the callout is not 100428, order the precise part number or length required for your assembly.

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