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Graco 100421 Screw Set Sch

The Graco 100421 Screw Set (SCH) is a durable, short-length set screw designed for precision fastening in select Graco assemblies. It ensures secure mounting and long-term stability in equipment frames.

  • Thread: 5/16-18 UNC-3A
  • Length: 0.375 in (10 mm)
  • Grade: 5 Steel Set Screw
  • Used In: RoadLazer® Skid-Mount OEM Striping Package (310664A)

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Compatible Machines – Graco 100421 Screw Set (SCH)

  • RoadLazer® Skid-Mount OEM Striping Package (Model 310664A)

Product Overview

The Graco 100421 Screw Set (SCH) is a grade 5 set screw used to secure components in specific Graco assemblies. Size: 5/16-18 UNC-3A with 0.375 in (≈10 mm) length, suitable where a short, high-strength fastener is specified.

Technical Specifications

Part Number 100421
Description SCREW, set (SCH)
Thread 5/16-18 UNC-3A
Length 0.375 in (10 mm)
Material Grade Grade 5
Typical Use Securing components in engine/frame or accessory sub-assemblies (as specified by model manual).

Fitment Notes

  • Listed in parts documentation for RoadLazer® Skid-Mount OEM (310664A).
  • Other machines may use this fastener; always confirm against your machine’s parts manual and serial number.
  • Use genuine Graco hardware to maintain performance and safety.

Installation Tips

  • Verify thread size and depth before installation.
  • Do not exceed torque recommended in your model’s manual.
  • Apply a suitable threadlocker if specified for vibration-prone assemblies.

Frequently Asked Questions

It matches the 5/16-18 UNC-3A thread and 0.375 in length, with grade 5 strength. Always confirm the exact spec and location in your Graco manual before substituting a generic fastener.

Confirmed for the RoadLazer® Skid-Mount OEM Striping Package (310664A). Other platforms may also specify this screw; verify by checking the parts list for your exact model and serial range.

Use only the specified length, thread, and grade. Longer or softer/harder bolts can cause interference, loosening, or damage. Follow torque specs in the equipment manual.

Apply threadlocker only if the service manual calls for it in that assembly (common on vibration-exposed locations). If used, select the strength grade recommended by Graco.

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