ProSpin 5/16"-24 Prop Nut with 5/16" Bushing (PN516)
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ProSpin 5/16"-24 Prop Nut with 5/16" Bushing
The ProSpin 5/16"-24 Prop Nut with 5/16" Bushing is a replacement mounting set for compatible ProSpin aluminum spinner installations. It includes a prop nut with a 5/16-inch diameter and 24 threads per inch, along with a matching 5/16-inch bushing.
This is the standard prop nut size supplied with ProSpin 3-1/2-inch, 3-3/4-inch, and 4-inch spinners. Before ordering, verify that your engine or motor has a 5/16"-24 threaded propeller shaft.
✅ Product Highlights
- Replacement prop nut for compatible ProSpin spinner installations
- 5/16-inch thread diameter
- 24 threads per inch
- Includes a matching 5/16-inch bushing
- Standard prop nut for several larger ProSpin spinner sizes
- MPI Products part number PN516
📏 ProSpin Spinner and Standard Prop Nut Guide
The table below shows the standard prop nut normally supplied with each ProSpin aluminum spinner size. If your engine uses a different shaft thread, a separately purchased replacement prop nut may be required.
| ProSpin Spinner Size | Standard Prop Nut |
|---|---|
| 1-1/2 to 3-1/4 inches | 1/4"-28 |
| 3-1/2, 3-3/4, and 4 inches | 5/16"-24 — This Model |
| 4-1/2 and 5 inches | 10 mm x 1.25 mm |
Understanding the 5/16"-24 Size
- 5/16 inch: Nominal thread diameter
- 24: Number of threads per inch
- 5/16-inch bushing: Matching bushing supplied with the prop nut
Both measurements are important. The correct diameter with the wrong thread count will not fit properly and may damage the prop nut or engine shaft.
Compatibility
The PN516 is intended for ProSpin spinner installations that require a 5/16"-24 prop nut and a 5/16-inch bushing. Engine and motor shaft specifications may vary, including between models from the same manufacturer.
- Compatible shaft thread: 5/16"-24
- Included bushing size: 5/16 inch
- Standard spinner sizes: 3-1/2, 3-3/4, and 4 inches
- Not interchangeable with an 8 mm metric prop nut
- Not a universal-fit prop nut
- Spinner and propeller are not included
View Technical Specifications
| Brand: | ProSpin |
| Manufacturer: | MPI Products |
| Part Number: | PN516 |
| Component Type: | Spinner prop nut and bushing |
| Thread Diameter: | 5/16 inch |
| Thread Specification: | 5/16"-24 |
| Bushing Size: | 5/16 inch |
| Standard Spinner Sizes: | 3-1/2, 3-3/4, and 4 inches |
Package Includes
- 1 x ProSpin 5/16"-24 prop nut
- 1 x 5/16-inch bushing
ProSpin spinner, propeller, engine, motor, and additional mounting hardware are not included.
💡 Modeler’s Tip
The correct prop nut should engage the shaft smoothly by hand. Never force it. If the nut binds immediately, stop and recheck the shaft diameter, thread count, and thread condition.
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