Split (Two-Piece) Shaft Collar, 1" Bore
A two-piece split shaft collar for a 1" bore: 1-3/4″ (1.75″) OD, 0.563″ (0.563″) wide, parted fully across by a 0.0625" kerf so it clamps on in two halves. The 3/8-16 screw draws the halves together onto the shaft, so it installs anywhere along a shaft without sliding off the end and grips without a hard set-screw witness mark. Load it as a configurable starting point; bore, width, material, and the screw are all editable.
Dimensions & defaults
| Bore | 1″ (1″) (slip fit) |
|---|---|
| Outside diameter | 1-3/4″ (1.75″) |
| Width | 0.563″ (0.563″) |
| Clamp screw | 3/8-16 cup-point socket (ANSI B18.3) |
| Default material | 1215 free-machining steel (configurable; 303 SS, 1045, 4140) |
| Style | Two-piece (split), 0.0625" parting kerf |
The bore, width, OD, set screw, and material all stay editable in the configurator. Set the bore to a slip fit on your measured shaft, and add a second set screw or a keyway if you need more holding power. Confirm the bore against your shaft before ordering.
Frequently Asked Questions
By the bore, the diameter of the shaft it clamps onto. Pick the card that matches your shaft and the collar loads with the bore, OD, width, and set screw already sized to it. Slide it on, line it up, and tighten the set screw against the shaft. Every dimension stays editable in the configurator.
A cup-point socket set screw (ANSI B18.3) threaded radially through the collar wall, bearing on the shaft. A 1" bore collar uses a 3/8-16 screw, smaller bores step down to 5/16-18 and 1/4-20. For higher holding power, a flat or a shallow spot drilled on the shaft under the screw helps; you can add a second set screw at 90 degrees in the configurator.
Set-screw collars are the simplest and lowest-cost way to lock a part to a shaft. The screw bites the shaft, leaving a small witness mark, and holds well for locating and light-duty work. Clamp (one-piece C-shape) collars have a single slit cut from the OD in to the bore on one side; a clamp screw squeezes the slit shut so the collar grips the full bore without marring the shaft, while staying one piece that can't fall apart. Split (two-piece) collars part fully across so they clamp the bore from both halves and install anywhere along a shaft without sliding off the end. Pick a set-screw card for most locating jobs, a clamp card when you cannot mark the shaft and want one-piece simplicity, or a split card when the collar has to go on mid-shaft without access to the end.
The cards default to 1215 free-machining steel. Switch to 303 stainless for washdown service, or 1045 / 4140 for higher clamp duty, in the configurator. Material certs (MTRs) are available on request.
Yes, that is the point of building them to order. Set any bore in the configurator, with a slip fit to your measured shaft, plus the keyway or second set screw if you need it. We confirm the bore against your shaft before cutting.