For a true 1-1/4-inch keyed shaft, the listed 3-foot KS3 shaft is the direct match. The SpinCo coupler and AZSSMUK collars are related components sized for a 1-1/4-inch shaft, not replacement shafts. The other keyed shafts below are 1 inch in diameter, so they are alternatives only when your equipment calls for that smaller size.
| Product | What It Is | Best For |
|---|---|---|
| KS3-1-1/4 | 1-1/4-inch keyed shaft, 3 feet long | Replacing or building with a 1-1/4-inch shaft |
| SpinCo coupler | 1-1/4-inch-bore shaft coupler | Connecting compatible shaft ends |
| AZSSMUK collars | Four collars with 1-1/4-inch bores | Axial positioning or support |
| Hicarer 1-foot shaft | 1-inch keyed shaft | Projects designed for a 1-inch shaft |
| Bailey Hydraulics 3-foot shaft | 1-inch keyed shaft | Precision-oriented 1-inch applications |
KS3-1-1/4 Keyed Shaft
This is the direct shaft match for a 1-1/4-inch shaft search. It measures 1-1/4 inches in diameter and 3 feet in length, with a listed 1/4-inch key width. The keyed connection is intended to transfer torque between a shaft and a component such as a gear, pulley, or sprocket.
Best for: Buyers replacing a KS3-1-1/4 or sourcing a 1-1/4-inch keyed shaft for a compatible assembly. It was selected because its stated diameter matches the search.
Check before ordering: The supplied details do not specify the keyway depth or shaft material. Confirm those requirements and the mating component dimensions before purchase.
SpinCo 1-1/4-Inch Shaft Coupler
This is a coupler, not a shaft. It has a 1-1/4-inch bore, a 2-1/8-inch outside diameter, and a 4-1/2-inch overall length. The product details list C1018 mild steel, a black oxide finish, set screws, and a 1/4-by-1/8-inch keyway.
Best for: Buyers connecting compatible shaft ends using a keyed coupler. It is included because the bore is specified for a 1-1/4-inch shaft.
Check before ordering: A matching bore alone does not confirm that the coupler suits your shaft arrangement. Verify the keyway dimensions and connection requirements. Avoid this if you need a standalone shaft.
AZSSMUK 1-1/4-Inch Shaft Collars
This set contains four solid-steel shaft collars with 1-1/4-inch bores and socket cup-point set screws. The collars are carbon steel with zinc plating. They are accessories for positioning or supporting a compatible shaft; they do not transmit torque in the same way as a keyed shaft and are not shafts themselves.
Best for: Buyers who already have a 1-1/4-inch shaft and need collars for the assembly. The bore size makes these relevant to the requested shaft diameter.
Check before ordering: The listing details do not provide collar width or outside diameter. Confirm clearance and placement needs before selecting them.
Hicarer 1-Inch Keyed Shaft, 1 Foot
This 1045 carbon-steel keyed shaft measures 1 inch in diameter and 1 foot long, with a 1/4-by-9/64-inch keyway. Its full-length premachined keyway can reduce the need for additional machining. The listing states an approximate 0.015-inch tolerance based on manual measurement.
Best for: Buyers with a compact assembly specifically designed for a 1-inch shaft. It offers a shorter length than the other listed shaft alternatives.
Important size distinction: This is not a 1-1/4-inch shaft. Avoid it if your equipment requires a 1-1/4-inch diameter.
Bailey Hydraulics 1-Inch Keyed Shaft
This Bailey Hydraulics shaft is 1 inch in diameter and 3 feet long. It is made from 1018 cold-rolled steel and has a standard 1/4-inch keyway. The product details describe it as a pre-keyed option for use with mechanical keys, which are not included.
Best for: Buyers who need a 3-foot shaft for a 1-inch application and value the listed cold-rolled steel construction. It is included as a clearly labeled size alternative, not as a 1-1/4-inch fit.
Check before ordering: Confirm the equipment requires a 1-inch diameter. This shaft will not directly replace a 1-1/4-inch shaft.
Buying Guide: How To Choose A 1-1/4-Inch Shaft
Does the shaft need to measure exactly 1-1/4 inches?
Check the equipment specification or measure the shaft diameter before ordering. A 1-inch shaft is not interchangeable with a 1-1/4-inch shaft simply because both are keyed. Match the diameter first, then confirm length and keyway dimensions.
What keyway dimensions should you verify?
Compare the shaft keyway width and depth with the key and the matching hub, pulley, sprocket, or gear. The direct 1-1/4-inch shaft listing specifies a 1/4-inch key width, while the SpinCo coupler lists a 1/4-by-1/8-inch keyway. Those descriptions do not establish that the parts are compatible; check all mating dimensions.
How much shaft length do you need?
Allow for the components that mount on the shaft and any required spacing or trimming. The direct 1-1/4-inch shaft listed here is 3 feet long. The 1-foot and 3-foot Hicarer and Bailey alternatives are 1 inch in diameter and should only be considered for equipment specified for that size.
When should you choose a coupler or collar?
Choose a coupler when you need a component intended to connect compatible shaft ends. Choose collars when you need parts that fit around a shaft for positioning or support. Neither accessory replaces the shaft itself, and bore size is only one compatibility check.
Frequently Asked Questions
Which listed product is actually a 1-1/4-inch shaft?
The KS3-1-1/4 is the direct shaft option. It is listed as 1-1/4 inches in diameter and 3 feet long.
Are the Hicarer shafts 1-1/4 inches in diameter?
No. The listed Hicarer shafts are 1 inch in diameter. Choose one only if your equipment calls for a 1-inch shaft.
Is the SpinCo product a shaft?
No. It is a shaft coupler with a 1-1/4-inch bore, set screws, and a listed keyway.
Do the 1-1/4-inch shaft collars include a shaft?
No. The AZSSMUK product is a four-piece collar set. Its listed 1-1/4-inch bore is intended to fit a shaft of that nominal diameter.
Is a 1/4-inch key width enough to confirm a match?
No. Also check keyway depth, key dimensions, and the mating component specifications before assembling the parts.