CNC Turned Stainless Steel Flanged Bushing Set
Flanged bushings turned from 304 stainless, with a bore held to H7 and round within 0.01 mm, an outside diameter at m6 for a press fit, a flange square to the bore within 0.02 mm and thickness at ±0.03 mm, supplied as a set matched within 0.05 mm.
- Bore H7, 0.01 mm Round
- Flange Square to 0.02 mm
- Flange Thickness ±0.03 mm
- Set Matched Within 0.05 mm
*Send the housing bore and the shaft size. A bushing pressed into a housing 0.02 mm over m6 will close its own bore by 0.01 mm, and the shaft that fitted on the bench will not go in after pressing.
Flanged Bushing Set Overview
A flanged bushing carries a shaft and takes axial load on its flange. Pressing it in closes the bore slightly, so the bore has to be sized for the housing, not for the bench.
The bushing is turned and bored in one clamping, the flange is faced square, the outside is turned to m6 and the bore is finished after the press fit allowance is applied.
304 Stainless
304 is the default for washdown and outdoor pivots: it does not need a coating, and passivation keeps the bore clean. It galls on a stainless shaft, so the bore is finished finer than a bronze bush.
Bronze or 316L
Oil-impregnated bronze is chosen where the bushing runs dry or at low speed, and 316L where chlorides are present and 304 would pit at the flange edge.
A 2.5 mm wall is the minimum for a press fit; thinner than that the bore closes 0.02 mm when the bushing is pressed and the shaft seizes.
Flanged Bushing Specifications
Turning and boring data for press-fit bushings, with the bore, flange and set values that keep a shaft turning freely.
| Specification | Machining Data | Specification | Machining Data |
|---|---|---|---|
| Product | Flanged Bushing Set (2 – 6 Pieces) | Machining Process | CNC Turning, Boring, Flange Facing |
| Material | 304 Stainless, 316L or Bronze on Request | Envelope | Bore Ø 8 – 50 mm, Flange Ø 16 – 70 mm |
| Bore | H7, Roundness 0.01 mm | Bore Finish | Ra 0.8 µm, Ra 0.4 µm Honed |
| Flange | Square to the Bore Within 0.02 mm | Flange Thickness | ±0.03 mm |
| Outside Diameter | m6 for a press fit, ±0.01 mm | Wall Thickness | 2.5 mm Minimum |
| Length | ±0.05 mm, Set Within 0.05 mm | Oil Groove | Width ±0.05 mm, Depth ±0.03 mm |
| Weight | 10 – 180 g per Piece | Coating | Passivated, No Coating in the Bore |
| Customization | Flange Diameter, Oil Groove, Cross Hole, Set Quantity | Lead Time | 5 – 7 Days Sample, 12 – 16 Days Batch |
| Inspection | Bore Air Gauge, Flange Squareness on Granite, Set Match Check | Packing | Bore Plug, Bagged by Set |
Key Features of Our Flanged Bushings
Flange and bore from one clamping, press allowance built into the bore, set checked on one mandrel.
Flange Faced With the Bore
The flange face is finished in the same clamping as the bore, so it sits flat on the housing within 0.02 mm and the bushing does not cock when it is pressed home.
Bore Sized for the Press Fit
The bore is finished 0.01 mm over nominal to allow for the closure that happens during pressing, so the shaft clearance is right after installation rather than on the bench.
Oil Groove Cut Before Finishing
The groove is cut before the bore is finished, which removes the burr it raises; cutting it afterwards leaves a lip that scrapes the shaft on assembly.
Set Checked on One Mandrel
Every bushing in the set is slid onto the same mandrel and checked for rock; a set that is individually in tolerance can still bind if the bores sit at opposite ends of H7.
Bushing that must not close on pressing?
Finishes for Flanged Bushings
The bore is a running fit, the outside is a press fit, the flange is a seat.
| Finish | Main Purpose | Finish | Main Purpose |
|---|---|---|---|
| Passivation | Removes free iron after turning | Electropolishing | Ra 0.4 µm bore for a sliding shaft |
| Bead Blasting | Even matte on the flange face | Masked Bore | Bore stays H7 |
| Oil Groove | Retains lubricant in a dry running bush | Laser Marking | Bore size and set number |
| Tin Plating | Non-stainless bronze variant only | Bore Plug | Keeps grit out in transit |
| Press Fit Check | Outside diameter gauged to m6 | Set Trial Fit | All bushings checked on one mandrel |
| Salt Spray | 500 h on 304 | Bore Recheck | H7 After Passivation |
*Electropolishing opens the bore 5 to 8 µm and is done before the final bore gauge check; a polished bushing is never reamed afterwards or the finish is lost.
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Turning a Flanged Bushing
The flange and the bore are finished in one clamping, so the bushing presses in square and the flange seats flat on the housing face.
01. Housing and Shaft Review
Confirm the housing bore, the shaft size and the axial load, then set the outside diameter and the bore allowance for the press.
02. Turn the Outside
Turn the outside to m6, face the flange square and part off with enough stock to face the second side.
03. Bore and Groove
Bore to H7, cut the oil groove if specified, then finish the bore with a sharp positive tool at low feed and check roundness in two planes.
04. Face the Flange
Face the flange to thickness at ±0.03 mm, square to the bore within 0.02 mm, and break both bore edges 0.3 mm.
05. Check, Passivate, Pack
Air gauge every bore, check the set on one mandrel, passivate, plug the bore and bag by set.
Send the housing bore and shaft diameter, and we will quote bushings with the bore sized for the press fit and the set checked on one mandrel.
Flanged Bushing FAQs
About 0.01 mm on a 2.5 mm wall into an m6 housing, and up to 0.02 mm on a thin wall. The bore is finished oversize by that amount so the shaft clearance is correct after pressing.
m6 into an H7 housing for a steel housing, p6 for aluminium. A tighter fit splits a thin housing, and a looser one lets the bushing turn in service.
In bronze, yes at low speed. In 304 stainless it will pick up on a stainless shaft, so either an oil groove or a bronze bush is specified for dry running.
Because a replacement bushing at the other end of H7 can bind on the same shaft. Matching the set within 0.05 mm means one shaft slides through all of them.
No, it only removes free iron. Electropolishing does, by 5 to 8 µm, so the bore is measured after polishing and before packing.
Yes, each piece can have its own flange, but the set is then matched on the bore only, and the pieces are marked so they go in the right position.
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