Graco 100077 Hex Heavy Jam Nut
$7.20
In Stock
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
Quantity
Genuine OEM Part
Fast Shipping (Order by 1 PM CST)
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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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