Overview & Compatibility for Graco 102300 Nut
Compatible Machines
- Graco 2-Gallon Stainless Steel Pressure Tank – Model 236155
- Graco High-Pressure Stainless Steel Tank – Model 236157
- Graco Hydra-Mastic Spray Gun (and similar Graco dispensing valves calling out a 9/16-18 jam nut)
- Other Graco fluid/air manifold assemblies specifying a 9/16-18 hex jam nut
What is the Graco 102300 Nut?
The Graco 102300 Nut is a hex jam nut (lock nut) used to secure components in Graco tanks, guns, and fluid/air manifolds. Its fine thread helps resist loosening from vibration, making it ideal for high-duty spray and pressure applications.
Technical Specifications
| Specification | Details |
| Part Number | 102300 |
| Common Name | Hex Jam Nut / Lock Nut |
| Thread | 9/16-18 (fine thread) |
| Typical Use | Locks or secures manifolds, covers, or fittings in Graco pressure tanks, spray guns, and fluid systems. |
| Notes | Always confirm with your unit’s parts list or service manual for exact placement and torque. |
Why use the genuine Graco 102300?
- Correct 9/16-18 thread fit for specified Graco assemblies
- Maintains equipment integrity under vibration and pressure
- Supports safety and longevity when installed per the unit manual
Install & Maintenance Tips
- Clean mating threads; check for burrs or wear before installation.
- Tighten to the assembly-specific torque specified by the machine manual.
- Inspect during service; replace if threads are deformed or corroded.
- Use with the correct mating fastener/fitting to ensure the jam-locking effect.
Frequently Asked Questions
While thread size matches, genuine Graco parts help ensure proper material, plating, and tolerances for the intended assembly. Substitutes can vary in fit and durability.
Torque is defined by the parent assembly (tank lid, manifold, gun body, etc.). Refer to your unit’s service manual for the correct torque value.
Check your model’s parts list for item 102300 or a 9/16-18 jam nut call-out. If unsure, share your sprayer or tank model/serial with support for verification.
No—102300 is the nut only. Order any required washers/fittings as specified in your unit’s bill of materials.
