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Graco 126669 Serrated Hex Head Machine Screw

The Graco 126669 Screw is a serrated-hex machine screw designed for secure, vibration-resistant fastening in Graco assemblies.

  • OEM Part #: 126669
  • Thread Size: 5/16-18
  • Length: 2.5 inches
  • Serrated hex head for strong grip
  • Used in Viscon HF heaters and mounting assemblies

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Graco 126669 Serrated-Hex Machine Screw

Compatible Graco Systems

  • Graco Viscon HF high-flow heater units
  • Graco control or mounting plate assemblies (refer to parts diagrams)

The Graco 126669 screw is a precision-machined, OEM fastener featuring a serrated-hex head for strong grip and vibration resistance. It’s used in Graco assemblies where secure, torque-retaining joints are required.

Key Features

  • Part Number: 126669
  • Head Type: Serrated hex – built-in locking surface
  • Thread Size: 5/16-18
  • Length: 2.5 in (per Graco parts diagram) :contentReference[oaicite:0]{index=0}
  • OEM Quality: Designed to Graco’s specifications for reliability

Technical Specifications

Specification Detail
Part Number 126669
Thread / Size 5/16-18
Length 2.5 in (63.5 mm) :contentReference[oaicite:1]{index=1}
Drive / Head Serrated Hex Head
Quantity per Assembly Used in pairs (e.g., Viscon HF heater) :contentReference[oaicite:2]{index=2}

Typical Applications

This machine screw is primarily used to secure heater components or mounting plates in Graco industrial systems. Its serrated head helps maintain clamping force under thermal cycling and vibration.

Installation Tips

  • Before installing, inspect mating surfaces for cleanliness and flatteness.
  • Use a torque wrench set to your Graco manual’s specification to avoid over-tightening.
  • The serrated head bites slightly into the surface — make sure it's positioned correctly.
  • After installation, re-check torque after the first heat / pressure cycle.

Frequently Asked Questions

A serrated hex head has small ridges underneath it that dig into the mating surface, helping to lock the screw in place and resist loosening from vibration.

The exact torque should be referenced from your Graco equipment’s service manual. As a general guide, follow Graco’s heater or assembly instructions for 5/16-18 fasteners.

Yes — this screw is used in Graco Viscon HF heaters and other assemblies, often listed in parts diagrams (part 74 in Graco manual). :contentReference[oaicite:3]{index=3}

While other screws may fit, using the genuine Graco 126669 ensures proper serration engagement, correct thread size, and reliable clamping — critical for safety and performance.

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