JIS Standard SKD61 Steel Straight Center Pins with Tip Processed

These straight center pins with a tip-processed surface are used as alignment components in injection mold tooling, especially where repeatable die closure and positional guidance are critical. The nitrided wear-resistant surface helps the pin maintain its dimensional stability after repeated cycles, supporting consistent centering in the cavity during start-up and steady-state production.

• Automotive connector and terminal molds: The tip-processed straight geometry promotes stable centering as the dies close, reducing the risk of misalignment under high clamping loads and abrasive wear from polymer flow and venting debris.
• Electronics housings and precision enclosures: Designed for an H7 class ejector sleeve inner-diameter fit, the pin helps maintain coaxial alignment in die cavities where tight assembly tolerances affect part geometry.
• Die cast or insert-overmolding tooling (where guided cores are needed): The SKD61 base with a nitrided surface supports long-term guidance by improving abrasion resistance while keeping fit consistency in guided systems.

Tip processing and the specified fit class make this variant well-suited for precision mold assemblies requiring stable alignment and long service life.

This product is made from JIS SKD61 steel, commonly selected for hot-work and mold tooling because it combines good toughness with wear resistance. The surface is nitrided, creating a hard, wear-resistant layer that improves abrasion resistance and supports consistent alignment during frequent die closures.

• Heat treatment state: The base material is in a mold-ready condition per SKD61 practice, followed by nitriding to form the strengthened surface layer.
• Hardness and performance trade-offs: Nitriding significantly increases surface hardness and wear resistance, while the core toughness helps reduce the risk of chipping compared to fully hardened, high-brittleness states.
• Wear vs. toughness: Compared with purely through-hardened approaches, nitriding emphasizes surface protection for longer guidance life while retaining a tougher interior.

Overall, SKD61 with nitrided surface treatment is suited for alignment pins exposed to repeated contact and sliding wear in mold cavities.

Select the center pin dimensions by matching the pin’s shaft diameter and length to the mold’s guidance interface and required travel/engagement depth. The D/P (shaft diameter) range is 1.5 to 15 mm with reference shaft diameter tolerances of -0.01 / -0.02, and the no. (nominal diameter) range is 2 to 16 mm. For length, choose L = 50 to 400 mm (or up to 50 to 500 mm depending on the variant).

• Fit to ejector sleeve: This pin variant is intended for an H7 class ejector sleeve inner-diameter fit—ensure your sleeve ID and pin D/P select within the intended H7 compatibility.
• Tip geometry selection: Pick the tip shape (B, C, G, R, T) and tip features (e.g., C = 0.1 mm, R = 0.2 mm, S = 0.1 mm) to achieve the desired lead-in during die closure.
• Taper angle: Use the specified K range (45–89° or 1–45°) to tune engagement and centering behavior.

When in doubt, confirm the cavity/core alignment requirement and the sleeve ID that defines the H7 fit, then lock shaft diameter and overall length accordingly.