When you're working through a bearings, couplings, and power transmission project, the connection between a rotating shaft and the component it drives can make or break the whole assembly. Two compact options are on the table: a rigid shaft coupling with a 7/8-inch bore and a face flange mounted shaft collar with a 1-inch inside diameter. Both are new, both are built for torque transmission, and their prices are close. But they solve the problem in different ways, and the right choice comes down to shaft size, mounting style, and how much adjustability you need.
Quick Verdict
If you need a direct, fixed connection between two shafts and your shaft diameter is 7/8 inch, the Shaft Coupling 7/8" Bore 1-3/4" OD 2" Length Rigid Coupling at USD 34.32 is the simpler, lower-priced pick. It uses four set screws to lock the connection and is built from 45# (ASTM1045) steel with a black oxide coating. For a 1-inch shaft and a flange-style mount with more hole options, the Face Flange Mounted Shaft Collars Hub Mount Shaft Collar Couplings at USD 38.65 is the more flexible choice. It clamps around the shaft and gives you three tapped counterbored holes plus three unthreaded holes for mounting.
At a Glance
| Feature | Shaft Coupling 7/8" Bore Rigid Coupling | Face Flange Mounted Shaft Collar | Hub Mount Shaft Collar Coupling |
|---|---|---|
| Price | USD 34.32 | USD 38.65 |
| Connection style | Rigid coupling with 4 set screws | Face flange hub-mount shaft collar |
| Shaft size | 7/8" bore | 1" inside diameter |
| Material | 45# (ASTM1045) steel with black oxide coating | Aluminum black anodize |
| Mounting features | Set screw mechanism for firm shaft connection | Three tapped counterbored holes and three unthreaded holes |
| Best role | Direct shaft-to-shaft torque transmission | Clamping on a 1-inch shaft with flange mounting flexibility |
Where Each Product Wins
The rigid coupling wins when you want a straightforward, fixed connection. Its description highlights set screw installation and a design meant to connect two shafts to transmit torque and rotational motion. It also costs less than the flange collar, and the black oxide coating on the steel body gives it corrosion resistance for long-term service.
The face flange mounted collar wins when you need more mounting flexibility around a larger 1-inch shaft. The three tapped counterbored holes and three unthreaded holes let you position the collar in more ways, and the clamp-style design holds evenly around the shaft. The aluminum black anodize build is lightweight and has good corrosion resistance.
Product Notes
Shaft Coupling 7/8" Bore 1-3/4" OD 2" Length Rigid Coupling, 4 Set Screws
If your shafts are 7/8 inch, this rigid coupling gives you a no-nonsense connection at USD 34.32. The 45# (ASTM1045) steel body with black oxide coating is built for durability, and the four set screws create a firm and precise hold on the shaft. The description emphasizes easy installation without special tools, so it suits a shop-floor setup where you want to get moving quickly. The main limitation is the fixed 7/8-inch bore; this coupling is sized for that specific shaft diameter, so it won't adapt to a 1-inch shaft without a different part. It also has a rigid design, so it's best when you don't need angular or parallel misalignment tolerance. For a direct motor-to-pump or motor-to-generator connection, it gets the job done at a slightly lower price.
Face Flange Mounted Shaft Collars Hub Mount Shaft Collar Couplings Alum or Steel
For a 1-inch shaft, the Face Flange Mounted Shaft Collar at USD 38.65 offers a different kind of hold. Instead of set screws, it clamps evenly around the shaft for a strong, mar-free grip. The three tapped counterbored holes and three unthreaded holes give you real flexibility in how you mount it to a flange or hub. The title mentions alum or steel options, and this listing's selected build is aluminum black anodize, which keeps things lightweight while still providing good corrosion resistance. That said, it costs about 11% more than the rigid coupling, and the 1-inch inside diameter means it won't work for the same 7/8-inch shaft application. If you need a compact flange-mounted collar for a bigger shaft and want mounting hole choices, this is the one.
Final Choice by Use Case
Choose the Shaft Coupling 7/8" Bore Rigid Coupling when you have a 7/8-inch shaft and want a simple, fixed, set-screw connection that transmits torque directly between two shafts. It's the lower-priced option and suits motors, pumps, and similar rotating equipment where alignment is already dialed in.
Choose the Face Flange Mounted Shaft Collar when you're working with a 1-inch shaft and need a clamp-style hub mount with more hole patterns for flange attachment. The extra mounting flexibility and lightweight aluminum build make it the better fit for setups where you need to bolt the collar to a face or housing rather than join two shaft ends.
