JIS Standard SKD61 Steel One-Step Core Pins

This one-step core pin is designed for precise locating in core/cavity mold assemblies where stable alignment during mold closure is critical. Its no second step geometry helps reduce locating variation across repeated cycles, improving part-to-part positional consistency.

• Automotive connector and sensor housings: Use the controlled shaft geometry to maintain concentricity in locating holes, supporting tight fit between core pin and mating bushings/bores for accurate insert alignment.
• Consumer electronics enclosures: The consistent tip finish options and SKD61 wear-oriented construction help resist dimension drift in high-shot production, supporting stable gate and feature locations.
• Medical device component molds: Reliable locating supports repeatable features that depend on core-pin positioning; select appropriate tip shape (e.g., B/C/G/R/T) to match the cavity entrance profile.

Shaft diameter variants in D/P 3.5–10 mm with tight tolerance (-0.01/-0.02) make this pin suitable for applications that require predictable clearance/fit with bushings.

JIS Standard SKD61 tool steel (commonly associated with H13-type hot-work mold steels) is selected for its balance of hardness and toughness in cyclic molding conditions. For core locating pins, wear resistance and dimensional stability are prioritized under repeated contact and sliding during mold open/close.

• Heat treatment: Typically supplied and used in a quenched & tempered condition to reach service hardness appropriate for tooling applications (final hardness is application-dependent).
• Hardness & wear: SKD61 is capable of high hardness for improved wear performance, supporting long production runs where locating surfaces experience repeated load.
• Toughness trade-off: Increasing hardness can reduce impact toughness; quenched & tempered optimization helps maintain a usable toughness level for core/cavity systems.
• Tip finish options: Different tip shapes (e.g., No processing, B/C/G/R/T) allow you to tune contact behavior without changing the core steel foundation.

If you require higher wear under extreme abrasion, compare with higher-alloy tool steels or nitriding-capable steels; however, this SKD61 option is well aligned with general-purpose durable mold core pin use.

Choose the core pin size by matching the shaft diameter (D/P) and the overall L to your mold locating bore and core/cavity layout. This variant supports D/P = 3.5–10 mm with nominal diameters of 4, 5, 6, 8, 10 mm, using shaft tolerance of -0.01/-0.02 to support accurate alignment in bushings.

• Length (L): Select L = 40–120 mm to ensure sufficient engagement depth while avoiding interference with adjacent mold components.
• No-second-step profile: Confirm that your bushing/hole system is designed for a single-step locating surface, since the geometry includes no second step and is intended to reduce locating variation.
• Step and tip features: Select the first step shape (1A–1E) and compatible tip shape (No processing, B/C/G/R/T) based on your cavity entrance and the desired centering/contact behavior.
• Tolerance/fit: Use the provided shaft tolerance (-0.01/-0.02) when calculating clearance and press/slide behavior in the mating bore. Account for your bushing tolerance stack when setting functional fit.

Some parameters are configurable (tip shape, step shape, diameters), while L is fixed to 40–120 mm range and the no-second-step feature remains constant for this series.