A sleeve or bushing that misaligns wears out fast and damages the shaft it protects. Graphite sleeves handle high temperature and sliding duty where metal fails. This article covers four checks that keep a graphite sleeve aligned and long-lived.
Jiecheng Graphite (since 2003) machines sleeves and bushings to spec, and confirms fit in writing.
Four checks that stop misalignment
Bore tolerance decides the fit on the shaft. Wall thickness carries the load. Grade sets temperature and wear resistance. And surface finish controls friction against the moving part. Confirm all four and the sleeve runs true.
· Bore tolerance — correct fit on the shaft
· Wall thickness — sized to the load
· Grade — rated for temperature and wear
· Finish — smooth, low-friction bore
Where sleeves and bushings are used
Sleeves and bushings guide shafts, reduce friction and protect housings in hot or sliding duty. Confirm the shaft size, clearance and temperature before ordering.
· Furnace roll and shaft bearings
· Hot-zone guide sleeves
· Pump and agitator bushings
· Thermal spray and sliding parts
What to specify before you buy
Send the shaft and bore size, length, clearance and temperature. Jiecheng Graphite machines sleeves in its 3,000 m² Dalang plant and ships worldwide.
Check | What to confirm | Why it matters |
Bore | Fit value | Controls alignment |
Wall | Thickness | Carries load |
Grade | Temp + wear | Sets life |
Finish | Ra value | Cuts friction |
Buying checklist
1. Send shaft, bore, length and temperature
2. Confirm bore tolerance and clearance
3. Specify grade and surface finish
4. Request inspection per batch
5. Freeze the sleeve spec
FAQ
Why is my sleeve wearing unevenly?
Misalignment or clearance; check fit and run-out.
What grade resists wear best?
A dense grade matched to temperature; confirm the value.
How much clearance do I need?
Enough for expansion and lubrication; confirm for your temperature.
Keeping the shaft running true
A misaligned sleeve damages the shaft it should protect. Confirm the bore, clearance and temperature before ordering, and check run-out in service. Jiecheng Graphite machines sleeves to the fit you specify and documents the bore, so the shaft runs true and wears evenly.
· Confirm bore and clearance
· Check run-out in service
· Document fit per batch
A sleeve stays aligned when bore, wall, grade and finish are confirmed. Jiecheng Graphite has made sleeves since 2003 and keeps the spec for consistent re-orders.
