DIN Standard SKD61 Steel One-Step Center Pins (Nitrided)

These one-step center pins are used in injection molding and press-tool assemblies where accurate sleeve-to-sleeve alignment is critical. The one-step profile helps locate mating sleeves in a single engagement, reducing drift during repeated setups and improving repeatability across production runs.

• Automotive connector and sensor housings: In multi-part tooling with stepped ejector sleeves, the nitrided surface on SKD61 supports stable fits under frequent cycling, helping maintain location as cavity pressure and thermal loads fluctuate.
• Medical device housings: For precision alignment in small-cavity molds, the tight shaft fit reference (−0.01/−0.02) supports controlled press-fit seating so the tooling returns consistently after maintenance.
• Industrial caps/closures molds: Where long cycle life and wear resistance are priorities, the nitrided SKD61 finish improves resistance to fretting and micro-wear at the locating interface.

The configured stepped geometry and the specified shaft-to-sleeve fit references make this variant especially suited for applications that demand consistent alignment without frequent rework.

DIN Standard SKD61 (tool steel) is selected for its balance of hardness, wear resistance, and toughness in mold tooling. In this variant, the pins are nitrided to form a hard, wear-resistant surface layer that helps resist galling and fretting at the one-step locating interface.

• Heat treatment state: nitrided SKD61 pins (surface treated for improved wear performance).
• Hardness & wear vs. toughness: nitriding increases surface hardness and wear resistance, while the underlying SKD61 retains core toughness to limit chipping risk during press-fit seating.
• Trade-offs vs. non-nitrided tool steels: nitrided SKD61 generally prioritizes surface durability; compared with through-hardened options, it focuses wear resistance at the surface where contact occurs.

Choose this SKD61 nitrided design when cycle-life and stable locating under repetitive tooling loads are primary requirements.

Select the pin size by matching the shaft diameter (D/P) and the overall length (L) to your tooling’s core/cavity or sleeve stack-up requirements. Available shaft diameter range is 1.5 ~ 16 mm, and the L dimension ranges from 70 ~ 500.1 mm depending on the selected configuration.

• Match the press-fit: use the provided shaft fit reference of (−0.01/−0.02) for the shaft, and pair it with the sleeve hole fit reference of H7-based clearance (+0.01/0). This is intended to yield a stable press-fit seating without excessive looseness.
• Verify tip geometry for location repeatability: choose the step shape (A/B/C/D/E) and tip shape option (No processing, B, C, G, R, T) that matches the locating pocket profile in your sleeve.
• Confirm tolerances at the tip: tip part tolerance options are ±0.02 or ±0.01, with A (0.5 ~ 2.5 mm) and other tip dimensions (e.g., V 0.5 ~ 2.5 mm) selecting the correct fit/engagement.

Where required, keep the one-step profile aligned with your sleeve hole’s reference to preserve repeatability across assemblies.