Choosing a shaft component for a bearings and power transmission setup usually comes down to three questions: what shaft size am I fitting, do I need rigid alignment or flexibility, and how much load will the part carry? The four parts here show how different those answers can be. One is a split collar meant for clamping onto an existing shaft, one is a rigid one-piece keyed coupling, one is an integral shaft bearing, and one is a CNC flexible coupling. Listed prices run from USD 12.05 to USD 184.79, so the practical choice depends less on price alone and more on whether the part actually matches your bore, shaft style, and torque requirements.
Quick take
At a glance, the Double Split Shaft Collar is the highest-priced listing at USD 184.79 and is shown with a 2-1/2-inch bore in a 10-pack quantity. The RC-075-KW rigid coupling is a one-piece black oxide steel part for 3/4-inch keyed shafts, priced at USD 18.59. The 885586 integral shaft bearing at USD 29.94 uses a 0.6267-inch round bore and double seals. The 40Cr Steel CNC flexible shaft coupling at USD 12.05 is the least expensive of the four and is made for a 4.76 mm (3/16-inch) flexible shaft.
Listed prices at a glance
| Product | Listed price | Price bar |
|---|---|---|
| Double Split Shaft Collar BLACK OXIDE (You Choose) | USD 184.79 | |
| RC-075-KW 3/4-inch Rigid Shaft Keyed Coupling | USD 18.59 | |
| 885586 Integral Shaft Bearings, 0.6267-inch Bore | USD 29.94 | |
| 40Cr Steel CNC Flexible Shaft Coupling for 4.76 mm (3/16-inch) Flexible Shaft | USD 12.05 |
Decision matrix
- Need a one-piece rigid coupling with a keyway for a 3/4-inch shaft? The RC-075-KW is the direct match.
- Need a sealed integral shaft bearing with a 0.6267-inch bore? The 885586 fits that role.
- Need a flexible coupling for a 4.76 mm (3/16-inch) flexible shaft? The 40Cr Steel CNC coupling targets that bore.
- Need a 10-pack of two-piece black oxide collars with a 2-1/2-inch bore? The Double Split Shaft Collar listing covers that bulk-collar need.
Product notes
Double Split Shaft Collar BLACK OXIDE - You Choose
This is the two-piece clamping collar in the group, with a black oxide plated steel body and a recessed screw head that leaves the outside surface free of major projections. The listing carries a 2-1/2-inch bore size, a 10-pack quantity, and a Two Piece style. If your job calls for a collar that can be installed around an existing shaft without major disassembly, this is the one to consider. The limitation is the price: at USD 184.79 it is clearly the highest listed price here, and the 10-pack quantity makes sense only if you need multiple collars or are ordering for a larger repair run.
RC-075-KW 3/4-inch Rigid Shaft Keyed Coupling
This one-piece rigid coupling is sized for a 3/4-inch keyed shaft, with a 2-inch overall length and a 1-1/2-inch outside diameter. The black oxide steel body uses two hex socket set screws, and the listed maximum torque is 1,420 inch-pounds with a maximum speed of 3,450 rpm. It suits forward/reverse, start/stop, and continuous motion applications where shaft misalignment is not expected. At USD 18.59, it sits near the lower end of the price range and gives you a specific keyway measurement of 3/16-inch width by 3/32-inch depth. The main limitation is that rigid coupling means no angular or parallel misalignment tolerance; the shafts need to stay in line.
885586 Integral Shaft Bearings, 0.6267-inch Bore
This integral shaft bearing is the bearing option in the group. It has a 0.6267-inch round bore, a 1.1811-inch outside diameter, and a 1.531-inch overall width, made from AISI 52100 steel with double NBR seals. That combination makes it a candidate for industrial and OEM power transmission applications where you need a sealed bearing and a compact overall profile. At USD 29.94, it lands between the low-price flexible coupling and the high-price collar pack. The limitation is that it is not a shaft coupling or collar; it is designed to support a shaft rotationally rather than to connect two shaft ends, so it solves a different part of the power transmission puzzle.
40Cr Steel CNC Flexible Shaft Coupling for 4.76 mm (3/16-inch) Flexible Shaft
This CNC-machined flexible coupling is made from 40Cr steel and fits a 4.76 mm (3/16-inch) flexible shaft, with an overall length of 42 mm. The listing notes a 0.02 mm negative tolerance on the shaft hole, meaning the fit is intentionally tighter than the stated diameter and may need moderate heat between 200 and 300 C if installation is difficult. It is described as suitable for high-torque brushless motor setups. At USD 12.05, it is the least expensive product in this comparison, so if your motor shaft and flexible shaft are in the 5 mm-to-4.76 mm range, this is a lower-priced way to get a flexible connection. The limitation is the narrow shaft diameter range; it will not fit larger inch-based shafts without a different bore.
Final recommendation by use case
- Rigid keyed connection for a 3/4-inch shaft: RC-075-KW at USD 18.59.
- Sealed integral shaft bearing with a 0.6267-inch bore: 885586 at USD 29.94.
- Flexible coupling for a 4.76 mm (3/16-inch) flexible shaft: 40Cr Steel CNC coupling at USD 12.05.
- Ten-pack of two-piece black oxide shaft collars with a 2-1/2-inch bore: Double Split Shaft Collar at USD 184.79.
