Set-Screw Shaft Collar, 3/4" Bore

A one-piece set-screw shaft collar for a 3/4" bore: 1-3/8″ (1.375″) OD, 1/2″ (0.5″) wide, with the wall tapped 5/16-18 through to the bore for a cup-point set screw (screw not supplied). Slides on and locks against the shaft to locate a bearing, sprocket, or sheave. Load it as a configurable starting point; bore, width, material, and the set-screw hole are all editable.

Set-Screw Shaft Collar, 3/4" Bore profile (configurator preview)

Dimensions & defaults

Bore3/4″ (0.75″) (H9 slip fit, ISO 286 hole basis)
Outside diameter1-3/8″ (1.375″)
Width1/2″ (0.5″)
Set-screw holeTapped 5/16-18, for a cup-point socket set screw (ANSI B18.3, screw not supplied)
Default material12L14 free-machining steel (configurable; 303 SS, 1045, 4140)
StyleOne-piece, set-screw

Tolerances and finish as loaded

Diameter tolerance (default)±.0050″
Length tolerance (default)±.0050″
Angular tolerance±0.5°
Surface finish (default)63 µin Ra
Material (default)12L14, cold finished
Outside cornerschamfer 0.03″
Inside cornersradius 0.015″

These are the values the configurator loads for this starting point; every one is editable before you order, and the drawing carries whatever you set.

Configure this part →

Reviewed and quoted: this part is quoted by a person rather than priced instantly because of tight-tolerance fits. Configure it and send it for a quote; quotes typically come back within one business day.

The bore, width, OD, set-screw hole, and material all stay editable in the configurator. The collar is tapped for its screw; the screw itself is not supplied. 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.

Shafts in the catalog with this bore diameter

Matched on diameter only (±0.0005″); confirm the keyway and fit class against your assembly.

11 more in the catalog match this diameter.

Machined from 12L14 by default. See the 12L14 material guide, or change the grade in the configurator.

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 tapped set-screw hole already sized to it. Slide it on, line it up, and tighten a set screw (not supplied) against the shaft. Every dimension stays editable in the configurator.
A cup-point socket set screw (ANSI B18.3), threaded radially through a tapped hole in the collar wall and bearing on the shaft. The hole is tapped for it; the screw itself is not supplied. A 1" bore collar is tapped 3/8-16, 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 tapped hole helps; you can add a second tapped set-screw hole at 90 degrees in the configurator.
The cards default to 12L14 free-machining steel, with the OD left as the cold-finished bar comes from the mill; we face, bore, and tap it. 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 a second tapped set-screw hole if you need it. The bore is held to an ISO 286 H9 hole fit — the whole tolerance sits on the plus side of nominal (about +0.0020″ at a 1″ bore), so it is never undersize and the collar always slides on. Check your measured shaft size before ordering.