A
Anonymous
Apr 14, 2026
Rating: 4/5
Works Well
Holds torque without slipping under moderate load conditions.
Description
45# Steel Rigid Coupling, Variable Bore Adapter and Extended Shaft Sleeve Connector 3/4/5/6/7/8/10/12mm
Reviews
Attributes
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | 45# Carbon Steel |
| Surface Treatment | Black Oxide Coating |
| Coupling Type | Rigid Sleeve |
| Shaft Diameter Range | 3mm to 12mm |
| Adapter Configuration | Step-Up/Step-Down |
| Fixing Method | Set Screws |
| Hardness Rating | HRC 28-32 |
| Precision Tolerance | H7/g6 |
| Application | Motor to Shaft Connection |
| Package Contents | 1 x Coupling, 2 x Set Screws |
5 reviews
A
Anonymous
Mar 25, 2026
Rating: 5/5
Perfect Adapter
Successfully joined 5mm and 8mm shafts without any wobble.
A
Anonymous
Feb 22, 2026
Rating: 5/5
Fast Shipping
Arrived earlier than expected and was well packaged.
A
Anonymous
Feb 10, 2026
Rating: 4/5
Good Fit
Slightly tight on the 12mm side but manageable with light sanding.
A
Anonymous
Feb 02, 2026
Rating: 5/5
Great Quality
Solid steel construction. Works perfectly for my CNC spindle extension.
5 FAQ
Q: Are set screws included in the package?
A: Yes, two set screws are included with every coupling unit.
Q: Will this fit a Nema 17 motor shaft?
A: It depends on the shaft diameter. Please check your motor shaft size against our 3mm to 12mm options.
Q: What is the return policy for this item?
A: You may return the item within 30 days if it remains unused and in original packaging.
Q: Is this made of stainless steel?
A: No, this product is manufactured from 45# carbon steel with a black oxide finish.
Q: What is the maximum torque rating?
A: Torque capacity depends on the specific size selected, but it is suitable for moderate load applications.
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