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Graco 101421 Pin Cotter

The Graco 101421 Pin, Cotter is a small yet essential fastener that helps secure components within various Graco spray guns and rigs. Perfect for maintaining firm connections and preventing disassembly during operation.

  • Part Number: 101421
  • Size: 1/16″ diameter × 3/8″ length
  • Fits: Pistol-Grip Mastic Flo Gun, Lubricator Gun, H-25, H-40, H-50, H-XP2, H-XP3
  • Function: Retains clevis pins and linkage assemblies securely

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Graco 101421 – Pin, Cotter (1/16″ × 3/8″)

Compatible Machines

This Graco 101421 Pin, Cotter is used across multiple Graco tools and rigs. Models confirmed from Graco literature and trusted parts lists include:

  • Pistol-Grip Mastic Flo Gun – Models 224990 & 224991 (also seen on variant series)
  • Lubricator Gun assemblies calling out a 1/16″ dia × 3/8″ cotter pin
  • Spray Foam/Polyurea Rigs that list 101421 in service parts, e.g. H-25, H-40, H-50, H-XP2, H-XP3

Tip: Always cross-check your unit’s parts breakdown by model & serial to confirm this exact cotter pin is specified.

Key Details

Graco Part # 101421
Official Name Pin, Cotter
Typical Size 1/16″ diameter × 3/8″ length (as referenced in Graco manuals for applicable tools)
Function Secures shafts/clevis components; prevents fastener back-out in guns, valves, and linkage points.
Where It’s Used Trigger/linkage pins, small pivot points, and retention locations on select Graco guns and rigs.

Fit Guidance

  • Match by part number (101421) in your model’s parts drawing.
  • If your manual specifies a cotter pin of 1/16″ × 3/8″, this is typically the correct replacement.
  • For close-tolerance assemblies, replace any worn clevis pins together with the cotter pin for best results.

Frequently Asked Questions

Check your model’s exploded parts diagram or manual. If it lists 101421 or a 1/16″ × 3/8″ cotter pin at the relevant location, this is the correct part.

Substitutions are not recommended. Using a different diameter or length can compromise retention or interfere with surrounding parts. Use the specified 101421 size to maintain safety and reliability.

Insert through the clevis/shaft hole, then spread the legs of the cotter pin evenly. Replace any worn pivot pins and apply a small amount of assembly lube if your manual allows, avoiding contamination of fluid paths.

Some manuals revise small hardware over time. If your diagram shows a different cotter pin P/N but with the same 1/16″ × 3/8″ spec, consult Graco support or your dealer to confirm interchange before ordering.

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