Designs and configurations
Ejector Sleeves
A hollow sleeve moves around a core pin to eject a boss or tubular feature. Concentricity and wall thickness are reviewed with the mating core.
Designs and configurations ↓Material options
SKD61 · SKH51
The final grade and treatment are confirmed after reviewing your drawing and operating conditions.
Dimensions, tolerances, hardness, quantity and delivery are confirmed in the quotation. No fixed stock specification is implied.
Designs and configurations
Select function and geometry, then confirm material, fits and treatment. Options may be combined; dimensions follow the agreed drawing.
Thin-wall and miniature sleeves
For small bosses, focus on wall thickness and annular contact area.
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Long sleeves
Long sliding bores require straightness, guidance and cleanliness checks.
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Stepped and custom sleeves
External steps and heads adapt to ejector plates and mounting space.
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Straight precision-ground sleeve
A cylindrical sleeve serves conventional annular ejection, finished to specified inner and outer fits, coaxiality and end-face requirements.
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Integral-head ejector sleeve
The retaining head and sleeve body form one piece; verify the head seat, mounting plate and core pin.
Send inquiry now →Industries and operating scenarios
A hollow sleeve moves around a core pin to eject a boss or tubular feature. Concentricity and wall thickness are reviewed with the mating core.
Tubular moldings, screw bosses and annular ribs: eject around the core rather than concentrating load at one pin contact.
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Materials and treatment options
Sleeves and core pins are a system: bore, OD, wall, coaxiality and wear resistance follow the part and stroke.
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Surface treatments and finishes
Bore and end faces may be ground, nitrided or coated to reduce sticking; long sleeves need bore straightness and cleanliness.
Send inquiry now →Surface treatments and finishes
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Grinding and polishing sliding surfaces
Specify roughness separately for sliding sections and part-contact tips while preserving head and orientation datums.
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Nitriding option
Confirm suitability, treated areas and case depth for the chosen steel; recheck diameter and thin-section distortion.
Family-specific questions
How to select sleeves with core pins?
Bore, OD, wall, coaxiality and length must match the core pin and boss—specify as a system.
Sleeve sticking or scoring?
Review bore finish, material/coating, mold temp and release; consider grinding, nitriding or harder grades.
Notes for long ejector sleeves?
Bore straightness, wall uniformity and square ends affect coaxial ejection—state runout on the drawing.
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