One-Step Core Pins No Second Step

One-step, taperless core pins are used in injection mold tooling when the core needs to be located in a single, controlled seating event. Their no second step geometry supports consistent contact and positioning, helping maintain repeatable core alignment through repeated molding cycles.

• Automotive connector housings: In multi-cavity molds, taperless one-stage locating reduces misalignment during core movement, supporting stable part geometry and ejection repeatability.
• Medical device housings and small precision parts: For tight assembly accuracy requirements, the one-stage configuration helps ensure predictable core positioning, reducing downstream variation in wall thickness and feature locations.
• Electronics and optical component molds: When fine tip/bearing dimensions are required for controlled guidance, hardened steel variants help resist wear that can otherwise degrade locating accuracy over production.

These applications benefit from the availability of hardened SKH51/DK61 steel options and the product’s taperless, one-step design for stable alignment without a secondary seating phase.

This product is available in SKH51 and SKD61 hardened steel variants, both selected to maintain dimensional stability and wear resistance in core/cavity locating service.

• SKH51 (HSS-based, commonly AISI M2-equivalent): Typically used where higher hot hardness and wear resistance are prioritized. The trade-off is that toughness and machinability can be more challenging than lower-alloy tool steels if the pin sees high impact loads.
• SKD61 (H13-equivalent): Often selected for a strong balance of toughness and thermal fatigue resistance for general hot-work tooling. Wear resistance is excellent, though the exact durability depends on surface finish and operating temperature.

In both cases, the pins are supplied in a hardened steel state to improve wear life. Because the load path is localization/contact-based, maintaining hardness supports consistent seating and reduces the drift of tip/bearing dimensions during production.

Select the core pin dimensions by matching the pin’s shaft diameter (D/P = 1–20 mm) and tip diameter (A/AAC = 0.4–5 mm) to the mating bore and guiding features in the mold core or cavity.

• Length (L): Choose from the provided ranges such as 6.5–100 mm, 6.5–120 mm, 6.5–150 mm, or 14–150 mm depending on your mold thickness/stack-up. Ensure the pin bearing length (F) falls within the specified options (e.g., 12–99.4, 12–119.4, up to 28–150).
• Tip and step geometry: Use the available tip/shape combinations (First Step Shapes: B, C, D, E; Tip Shapes: B, C, G, R, S, T) to align with your taperless seating pocket.
• Tolerance fit: For L dimension tolerance, use the two stated bands: 0/-0.05 or +0.01/0. This affects preload/contact timing; verify clearance/fit for the bearing bore length (F) to prevent premature bottoming.

Most dimensions are configuration-based within the listed ranges; lock the shaft and tip diameters first, then finalize L/F to achieve controlled one-stage seating with no second step.