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Graco 100077 Hex Heavy Jam Nut

The Graco 100077 Hex Heavy Jam Nut is a durable OEM lock-nut designed for securing threaded components in Graco high-pressure sprayers and pumps.

  • Part Number: 100077
  • Thread Size: 5/16-18 UNC
  • Used In: Fire-Ball 425, 8900 Proportioner, LineDriver 4.0 HP, iQ Dispense Valves
  • Function: Prevents loosening under vibration and pressure cycling

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Graco 100077 Hex Heavy Jam Nut — Overview & Compatibility

Compatible Machines

Based on Graco parts manuals and exploded views, Graco 100077 appears in the following equipment assemblies:

  • Fire-Ball 425 — 10:1 Pump (Model 965129, Series A) — listed as “NUT, hex” in the priming valve/rod assembly.
  • Graco 8900 Proportioner — listed as “NUT; 5/16-18” (multiple pieces used on valve mounting/bracket assemblies).
  • LineDriver 4.0 HP Gas-Powered Airless Line Driver (Model 231-149, Series C) — shown in the machine parts breakdown as “Nut, Hex”.
  • iQ™ Dispense Valves (select variants) — parts list calls out “NUT, jam hex” (item 415) within the air-cylinder/adapter sub-assembly.

Product Summary

The Graco 100077 Hex Heavy Jam Nut is a robust, low-profile lock-nut used to secure threaded components in high-pressure pump and fluid-handling assemblies. Its jam-nut profile helps prevent loosening under vibration and pressure cycling.

Specifications

Part Number 100077
Type Hex Heavy Jam Nut (lock-nut style, low-profile)
Thread 5/16-18 UNC (as referenced in Graco parts listings for certain assemblies)
Typical Use Securing priming/valve rods, brackets, and sub-assemblies in airless pumps, proportioners, line drivers, and dispense valves.
Finish/Material Heavy-duty steel nut (finish may vary by kit/build; verify per model BOM)

Key Features

  • Low-profile jam-nut geometry helps resist loosening in high-vibration environments.
  • Suitable for high-pressure airless and industrial fluid applications when specified by Graco.
  • Direct-fit OEM part number for assured compatibility where listed in the manual.

Frequently Asked Questions

Functionally similar, but OEM Graco parts ensure correct thread tolerance, profile, and reliability in high-pressure assemblies. When a manual specifies 100077, use the OEM part.

Many Graco parts lists call out 5/16-18 UNC for 100077 in specific assemblies. Always confirm thread and location in your machine’s parts manual before ordering.

It appears in the priming valve/rod sub-assembly as “NUT, hex” in the parts list for the 10:1 Fire-Ball 425 pump (specific model/series). Check your exact model’s BOM.

Yes, some Graco 8900 Proportioner assemblies and certain iQ™ Dispense Valve variants list 100077 in their parts tables. Confirm your exact model and revision.

Clean threads, align components without cross-threading, and tighten per the machine’s torque guidance. Re-check after initial operation due to vibration and pressure cycling.

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