SKD61 Steel Nitrided Straight Ejector Sleeves (ESNV) Head T=4 mm

These SKD61 nitrided straight ejector sleeves are used inside injection mold base tooling to guide ejector pins and maintain straight, repeatable ejection throughout production cycles. The nitrided surface helps resist scuffing and fretting where the moving ejector components slide under load.

• Automotive electrical connector molds: In long-run tooling where many parts cycle at high frequency, the ESNV single-sleeve guidance supports stable pin alignment and reduces the risk of ejector mis-travel.
• Precision consumer appliance housings: For molds requiring consistent ejection across multiple cavities, the H7 inner-bore tolerance supports a tight guidance fit for smooth movement and dimensional stability.
• General straight ejector sleeve assemblies: The Head T=4 mm variant is suited to standard straight sleeve stack-ups where head thickness must match the assembly interface.

This component uses SKD61 steel, selected for its balance of hardenability, toughness, and wear resistance typical of hot-work and mold components. SKD61 is commonly regarded as equivalent to AISI H13 in practice, supporting robust performance under cyclic mechanical loading.

• Nitriding: The sleeve includes a nitrided surface to increase surface hardness and improve wear resistance at the sliding guidance area. This surface treatment is especially beneficial for limiting galling during repeated ejection.
• Hardness / trade-off: Nitriding primarily raises near-surface hardness while retaining a tougher steel core. This helps balance wear resistance with resistance to cracking compared with fully high-hardness through-treatment.
• Manufacturing approach: A hardened/tempered SKD61 base is typically machined to size, then nitrided to finalize the low-friction, wear-resistant guidance surface.

If alternative steels were used, they would typically be selected based on whether priority is higher core toughness or higher surface wear performance; this SKD61 + nitride combination targets reliable guidance life.

To select the correct ejector sleeve, match the sleeve’s bore and overall length to your ejector pin and cavity/core geometry. This variant is specified for D/P (shaft diameter) = 4 ~ 10 mm and V (hole diameter) = 1.5 ~ 6 mm.

• Step 1: Choose guidance fit via inner bore (V): Select the sleeve with the required H7 inner-bore tolerance to achieve accurate, repeatable pin guidance. Use the closest matching V value within 1.5 ~ 6 mm.
• Step 2: Confirm shaft diameter (D/P): Ensure the intended ejector shaft falls within 4 ~ 10 mm so the guidance relationship is maintained.
• Step 3: Set length (L): Use one of the available L ranges—75–200, 75–250, or 100–300 mm—based on your stack height and required support length.
• Head interface: The Head T=4 mm is fixed for this series, so verify it matches the assembly seating thickness in your tool design.

Because the bore is specified to H7, maintain proper clearance with the ejector pin per your fit standard; tighter guidance reduces side play but may increase sensitivity to surface finish and pin alignment.