SKD61 Steel One-Step Center Pins One-Step

One-step center pins support precise self-centering during mold assembly, especially where repeated tool cycles can amplify misalignment. The 4 mm head acts as a stable guidance feature, helping operators seat the pin consistently before the cavity/core halves fully close.

• Automotive connector and bracket molds: Use the configurable tip/step geometries to match sleeve and bore requirements, improving alignment repeatability under high-cycle production.
• Appliance and housings with thin-wall cores: The hardened SKD61 steel resists fretting wear at the guidance interfaces, maintaining centering stability as parts cycle rapidly.
• Medical device housing tooling: The one-step geometry supports repeatable positioning, reducing variation in assembly alignment that can affect cosmetic or functional features.

With selection ranges for shaft diameter (D/P 1–10 mm) and head-supported seating (4 mm head / T4), this variant is suited for designs needing stable centering without complex multi-step alignment features.

The center pin is manufactured from SKD61, a hot-work tool steel commonly aligned to AISI H13 class performance for mold tooling applications. In injection mold service, SKD61 provides a balance of wear resistance at guidance interfaces and toughness for repeated assembly and ejection cycles.

• Hardness & wear: Typical hardened-and-tempered service conditions target stable HRC for sliding/contact guidance, supporting long life against fretting and wear.
• Toughness trade-off: Higher hardness improves wear resistance, while excessive hardness can reduce impact toughness during assembly; tempered conditions are used to recover toughness.
• Heat treatment state: Generally supplied in a hardened & tempered form for dimensional stability and consistent performance.
• Material comparison: Compared with lower-alloy steels, SKD61 better withstands contact wear and cyclic loading; compared with higher-wear tool steels, it offers a practical toughness/wear balance for center guidance.

Specific hardness depends on the delivered heat treatment condition and final selection.

To select the correct stepped one-step center pin, start by matching the shaft diameter to the intended sleeve hole and guidance bore. For this product, the D/P (shaft diameter) is specified in the range 1 ~ 10 mm, with a shaft diameter tolerance of -0.01/-0.02, 0/-0.005.

• Sleeve compatibility: Choose a pin whose shaft diameter fits the compatible sleeve hole diameter tolerance of +0.01/0 or H7 or +0.005/0. This ensures controlled guidance without excessive clearance.
• Nominal diameter and step geometry: Confirm the nominal diameter No. 1.5 ~ 12 mm and select the step shape (A–E) and tip shape (No processing, B, C, G, R, T) that fit the sleeve/bore profile.
• Length matching: Validate the L dimension selection (e.g., 70–200 up to 70–500 variants) for tool thickness and engagement depth.

When configured, tip geometry tolerances (e.g., A/V ±0.02 or ±0.01) should be checked against the mating sleeve’s machining tolerance to maintain centering precision and avoid binding during assembly.