JIS Standard SKD61 Steel Straight Ejector Sleeves

Q: What ejector shaft diameter range can these straight ejector sleeves guide?

The sleeve is specified for D/P (shaft diameter) = 4 ~ 16 mm . Select the sleeve so the mating ejector shaft diameter falls within this range to maintain proper guidance through the nitrided bore.

Q: How does the nitrided bore of SKD61 improve performance for ejection sliding?

The bore is nitrided on the SKD61 steel body to improve surface wear resistance and sliding stability. This helps resist galling and abrasive wear that can occur between the sleeve and ejector components during repeated cycles.

Q: Which available length (L) range should be used to cover the ejector’s active travel?

Available L ranges are 50 ~ 200 mm , 50 ~ 250 mm , and 80 ~ 300 mm . Choose a length that spans the die’s guidance/contact zone for the active ejection travel while avoiding interference with the die set.

Q: Is the 4 mm head thickness (T4) compatible with standard die set positioning?

These sleeves are built with a 4 mm head thickness (T4) , supporting stable positioning and consistent alignment during ejection. Confirm your die pocket depth and locating/stop features provide the space required for the head so the sleeve seats correctly in the die set.

Straight ejector sleeves (SKD61 steel) are nitrided for improved wear resistance and stable sliding in die applications. The T4 head thickness supports reliable positioning and consistent alignment during ejection.

Single-sleeve design with stable straight guidance for controlled ejection
Nitrided SKD61 steel construction helps resist galling and abrasive wear
H7 inner diameter tolerance supports precise fit with ejector components
ESN-LC type sleeve for use in standard die sets and tooling

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Specifications

14 configurations available

D/P (Shaft Diameter) (mm)	V (Hole Diameter) (mm)	L (L dimension) (mm)	type
4	1.5 ～ 2.5	50 ～ 200	-
4.5	1.5 ～ 2.5	50 ～ 200	-
5	2 ～ 3	50 ～ 200	-
5.5	2 ～ 3	50 ～ 200	-
6	2.5 ～ 4	50 ～ 250	-
6.5	2.5 ～ 4	50 ～ 250	-
7	2.5 ～ 5	50 ～ 250	-
7.5	3 ～ 4	50 ～ 250	-
8	4 ～ 6	50 ～ 250	-
9	6 ～ 7	80 ～ 300	-
10	6 ～ 8	80 ～ 300	-
12	8 ～ 9	80 ～ 300	-
13	8 ～ 10	80 ～ 300	-
16	10 ～ 12	80 ～ 300	-

Product Guide

🏭Application Scenarios+

These straight ejector sleeves are used in injection mold die sets where long, stable ejection travel must be guided with minimal misalignment. The nitrided SKD61 construction supports smooth sliding under repeated cycles, helping reduce galling and abrasion at the sleeve–ejector interface.

Automotive connector and sensor molds: Employed as straight guidance components to maintain consistent ejection alignment for thin-wall parts and deep-cavity geometries.
Appliance and electronics housings: Suitable for multi-run tooling where ejector movement must stay concentric to prevent surface damage and uneven part release.
General die sets (ESN-LC type): Works well in standard die configurations requiring a controlled straight ejection path.

The nitrided bore and 4 mm head thickness (T4) help hold stable positioning so ejector components remain aligned during start/stop, improving ejection repeatability.

🔧Material & Process Details+

The sleeve is made from JIS Standard SKD61 steel, commonly referenced as an H13-family hot-work tool steel (AISI H13 equivalent in many industrial materials mappings). SKD61 is selected for its balance of hardness, wear resistance, and toughness under thermal cycling.

Nitrided bore: The nitriding treatment increases surface hardness and improves resistance to galling and abrasive wear during sliding.
Heat treatment state: Delivered as nitrided for enhanced wear performance at the bore while maintaining core toughness typical of tool steels.
Hardness / trade-off: Nitriding boosts wear resistance at the surface, while the tempered tool-steel core supports toughness to resist chipping under shock loading from ejection events.

Compared with non-nitrided tool steels, the nitrided bore variant prioritizes reduced friction and longer guidance life in high-frequency die applications.

📐Sizing & Selection Guide+

Select the sleeve by matching the required shaft and clearance geometry for the ejector guide interface. Use D/P = 4 ~ 16 mm to match the ejector pin/shaft diameter that rides inside the sleeve, and choose V = 1.5 ~ 10 mm to match the corresponding hole/shaft engagement specification provided in your die design.

Choose L (length): Select from available ranges 50 ~ 200 mm, 50 ~ 250 mm, or 80 ~ 300 mm based on the required guidance length in your die.
Account for head thickness (T4): Verify the 4 mm head thickness fits the die pocket/stop geometry to maintain stable alignment during ejection.
Fit and tolerance: The inner diameter is specified with H7 tolerance, so ensure the mating ejector shaft is selected to achieve the intended slip-fit/guide clearance.

For best guidance, keep L long enough to cover the active travel region while avoiding interference with adjacent die components.

Frequently Asked Questions

What ejector shaft diameter range can these straight ejector sleeves guide?+

The sleeve is specified for D/P (shaft diameter) = 4 ~ 16 mm. Select the sleeve so the mating ejector shaft diameter falls within this range to maintain proper guidance through the nitrided bore.

How does the nitrided bore of SKD61 improve performance for ejection sliding?+

The bore is nitrided on the SKD61 steel body to improve surface wear resistance and sliding stability. This helps resist galling and abrasive wear that can occur between the sleeve and ejector components during repeated cycles.

What does the H7 inner diameter tolerance mean for selecting the mating part?+

The product specifies the inner diameter as H7 tolerance. When choosing the ejector shaft or pin, select dimensions that achieve the intended fit/clearance for stable guidance without excessive play.

Which available length (L) range should be used to cover the ejector’s active travel?+

Available L ranges are 50 ~ 200 mm, 50 ~ 250 mm, and 80 ~ 300 mm. Choose a length that spans the die’s guidance/contact zone for the active ejection travel while avoiding interference with the die set.

Is the 4 mm head thickness (T4) compatible with standard die set positioning?+

These sleeves are built with a 4 mm head thickness (T4), supporting stable positioning and consistent alignment during ejection. Confirm your die pocket depth and locating/stop features provide the space required for the head so the sleeve seats correctly in the die set.