CNC Turned Brass Slotted Bushing
Slotted bushings turned from CW614N brass or bronze, with a bore honed to H8 and 0.01 mm roundness, outside diameter held to h7, lubrication slots milled to ±0.05 mm in width and a 15° lead-in chamfer at both ends. Oil holes are drilled through the wall and deburred from the bore side before the final hone.
- Bore Honed to 0.01 mm
- Slots Milled Without Burr
- Lead-in Chamfer 15°
- Oil Holes Broken Through
*Send the shaft diameter and the running clearance, plus the lubrication method. A slot bushing that is greased needs different slot geometry from one that runs oil-impregnated.
Slotted Bushing Overview
A slotted bushing is a plain bearing with a lubrication path cut into it. The clearance sets the film thickness, the slots distribute the lubricant and the chamfer stops the shaft from shaving a burr off the bore edge on assembly.
The bushing is turned with the bore undersize, the slots and oil holes are milled, then the bore is honed to size so the slot edges are crossed by the hone rather than left with a milling burr. The outside is finished between centres to keep it concentric with the bore.
CW614N Brass
Free-cutting brass is used for low-load, low-speed bushes because it machines to a fine bore and resists fretting against a steel shaft. It is not suitable for high load, where the film breaks down and the brass picks up on the shaft.
Phosphor Bronze or Oilite
Phosphor bronze is chosen for higher load and lower speed, where its structure holds a lubricant film. Sintered Oilite is used where the bushing must run without a grease line, because the porosity stores oil through the wall.
Brass for light duty and clean shafts; bronze where the load is higher or the shaft is hardened; sintered bronze where no lubrication point exists.
Slotted Bushing Specifications
Turning and slotting data for lubricated bushings, with the bore, slot and concentricity values that set the running clearance.
| Specification | Machining Data | Specification | Machining Data |
|---|---|---|---|
| Product | Slotted Bushing / Lubricated Sleeve | Machining Process | CNC Turning, Slot Milling, Honing |
| Material | CW614N Brass or Bronze | Bore Range | Ø 8 – 90 mm |
| Outside Diameter | Ø 14 – 120 mm, h7 | Bore Tolerance | H8, Roundness 0.01 mm |
| Wall Thickness | 2 – 12 mm | Slot Width | 1.5 – 6 mm, ±0.05 mm |
| Slot Depth | Through Wall or Blind 70 % | Concentricity | 0.015 mm Bore to OD |
| Lead-in Chamfer | 15° × 1 mm Both Ends | Oil Holes | Ø 1 – 4 mm, Deburred Inside |
| Customization | Graphite Plugs, Grease Groove, Flanged End | Lead Time | 5 – 7 Days Sample, 10 – 14 Days Batch |
| Inspection | Bore Air Gauge, CMM Slot Position, Concentricity Between Centres | Packing | Oil Coated, Individually Bagged, Carton |
Key Features of Our Slotted Bushings
Slots first, hone last, no burr in the bore.
Bore Honed After Slotting
Honing crosses the slot edges, so no milling burr is left to score the shaft or to break away into the clearance.
Slots Milled to ±0.05 mm
The slot width controls how much lubricant reaches the load zone, and is held to ±0.05 mm with the ends radiused so no crack starts.
Lead-in Chamfer Both Ends
A 15° chamfer lets the shaft enter without shaving the bore edge, which is the usual cause of a new bushing scoring on first assembly.
OD Concentric to 0.015 mm
The outside is finished between centres after honing, so the bushing sits square in its housing and the clearance is uniform around the shaft.
Bushing that has to hold a lubricant film?
Surface Finishes for Slotted Bushings
The bore is the running surface and stays bare; the outside is a press fit and also stays bare.
| Finish | Main Purpose | Finish | Main Purpose |
|---|---|---|---|
| Oil Impregnation | Lubricant retention in dry-start bushes | Ultrasonic Clean | Removes slot burrs and cutting oil |
| Passivation | Removes free iron from tooling | Tumble Deburr | Breaks slot edges without rounding the bore |
| Laser Marking | Bore size and fit direction | Bare Bore | No coating inside the running clearance |
*No coating goes inside the bore or on the outside diameter, because either would change the fit. Protection is oil or VCI, not plating, unless the bore is masked.
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Turning Process for Slotted Bushings
The slots are milled before the bore is honed, so the honing bar crosses the slot edges and leaves no burr to score the shaft.
01. Shaft and Lubrication Review
Check the shaft diameter, the required clearance and the lubrication method, then decide slot width, depth and oil hole position.
02. Turn With Bore Allowance
Turn the outside to h7 and bore 0.1 mm undersize, then part off with enough face allowance to clean up both ends.
03. Mill Slots and Drill Oil Holes
Mill the slots to width with radiused ends, drill the oil holes through the wall and deburr from the bore side before honing.
04. Hone the Bore
Hone to H8 with a cross-hatch pattern, checking roundness and clearance with an air gauge at both ends of the bore.
05. Chamfer, Clean, Oil
Cut the 15° lead-in chamfers, ultrasonically clean, oil coat and bag each bushing so the bore is not handled before fitting.
Send the shaft diameter and the lubrication method, and we will quote bushings with the bore honed after slotting.
Slotted Bushing FAQs
0.02 to 0.05 mm on a 20 mm shaft for greased duty, and up to 0.08 mm for dry or dirty service. The clearance is set by the bore hone, so it is fixed at machining.
Slots carry lubricant around the circumference to the load zone, while a single hole feeds one point. Slots are used where the load direction changes or the shaft runs continuously.
Yes, for sintered bronze. Solid brass cannot be impregnated, so it is supplied oil coated or with graphite plugs fitted into the wall.
The bore is honed after slotting, which crosses the edges cleanly. The outside slot edges are tumble deburred, so no hand work touches the bore.
At least 2 mm for a 20 mm bore, and 1/8 of the bore diameter for higher loads. A thin wall collapses when pressed into an interference-fit housing.
Yes, a flange can be turned on one end with the flange face square to the bore, which also gives a thrust surface and a positive axial location.
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