JIS Standard SKD61 Steel One-Step Core Pins

One-step core pins are used in injection mold toolsets where precise alignment and repeatable ejection paths are critical. Their single, no-second-step head design helps maintain stable core seating during mold closure, reducing variation that can otherwise shift the ejector alignment over production cycles.

• Automotive connector and housing molds: The TiCN-coated tip supports wear-resistant guidance under repeated spotting and ejection, helping keep tight fit between stepped core features and mating components.
• Precision consumer electronics housings: The controlled tip geometry and tight dimensioning ranges (including tip gradient ±0.02) support accurate assembly and consistent core positioning for fine wall/feature tolerances.
• Medical device component molds: One-piece core pin construction minimizes step-to-step stack-up, supporting reliable registration when multiple inserts or cores must stay aligned during thermal cycling.

This variant uses JIS Standard SKD61 steel for the core pin body. SKD61 is commonly mapped to an H13-class hot-work tool steel, providing a practical balance of hardness, toughness, and thermal fatigue performance for cyclic molding environments.

• TiCN-coated tip: The TiCN surface is intended to improve wear resistance at the guiding tip where sliding contact and repeated alignment loads are highest.
• Heat treatment: Supplied parts are typically produced from quenched & tempered SKD61 or pre-hardened stock depending on the manufacturer’s workflow, followed by coating for the tip (exact hardness/HRC is not specified in the provided data).
• Trade-offs: Higher hardness improves wear life but can reduce toughness; SKD61’s tempered structure is selected to maintain impact resistance under repeated mold opening/closing.

Select the core pin by matching both the shaft diameter range and the stepped geometry to the core insert and mating bore. The D/P (shaft diameter) is available from 3 ~ 16 mm, and the nominal diameter range No. (3.5 ~ 20 mm) should align with your design’s callout.

• Length (L): Choose from 12 ~ 120 mm (with an alternate range of 30 ~ 120 mm per the listed specification) to suit the required engagement depth in the mold block.
• Tip and step geometry: Set the first step shape (1A ~ 1E) and tip shape (No processing, B, C, G, R, T) to control guidance and ejection alignment. Step type parameters include A = 1 ~ 4 mm, and taper width options such as C = 0.1 ~ 4 mm (or 0.1 ~ 3.9, 1.1 ~ 4 depending on the configuration).
• Tolerance & fit: The L dimension tolerance is listed as +0.02/0, 0/-0.1. Use this tolerance to verify clearance/press-fit expectations for the bearing bore length F = 10 ~ 28 mm and to prevent misalignment from stack-up.