JIS Standard Steel Block Core Pins No Tip No Engraving

These block core pins are used as precision core-support components in injection and die-casting mold tooling where clean core seating is critical. With the flange position set to F = 0°, they help maintain consistent alignment between the mold block and mating parts during assembly and repeated clamping cycles.

• Automotive and electronics insert molds: The no-tip, no-engraving configuration avoids interference with tight-fitting rectangular core blocks and simplifies handling where identification marks could contact adjacent components.
• Large die-casting or insert molding blocks: Straight or flanged core designs benefit from the fixed flange geometry (H = 4–6 mm) and optional flange presence to stabilize core location under moderate wear conditions.
• Production molds needing durable core seating: Hardened steel variants (SKH51 or NAK80) support reliable wear resistance at the pin/block interface, reducing loosening or seating drift over long runs.

Choose this variant when you need controlled flange placement, minimal risk of machining interference, and hardened core support.

This series is offered in SKH51 or NAK80 steel options for block core pin applications. SKH51 is typically selected for higher wear resistance; the provided hardness range is 61–64 HRC, which improves resistance to fretting and edge wear at the seating surface.

• SKH51 (high hardness option): Harder condition for increased wear resistance, with the trade-off of requiring good alignment and handling to avoid brittle chipping at small corner radii.
• NAK80 (lower hardness option): Provided hardness range 37–43 HRC, offering improved toughness characteristics compared with very hard grades while still providing durable core support.

Manufacturing typically uses precision block-pin machining to the specified profile, followed by appropriate heat treatment to reach the stated HRC targets for each material choice. Corner detail is constrained by the specified R = 0.1–0.2 mm, so maintaining the heat-treated dimensions is important for consistent seating fit.

Correct sizing ensures stable core seating and prevents misalignment caused by flange geometry or corner mismatch. Use the fixed geometry parameters first: the flange position is fixed at F = 0°, the flange thickness H = 4–6 mm, and the outer profile width W = 1–20 mm. The pin overall length is L = 10–70 mm.

• Match outer diameter P: Select P = 1–20 mm to fit the mating bore for the rectangular block core support.
• Set corner radius R: Use the specified R = 0.1–0.2 mm to avoid interference at the seating transitions, especially when cavities are tightly packed.
• Chips/step control via R-chamfered position: Choose R-chamfered position = 1–4 to align chamfered transitions with the core/block edge contact points.
• Flange thickness variation (HC): If applicable to your configuration, select HC = 2.1–5.9 mm (or 2–5.9 mm depending on variant) to achieve the required seating height where the flange changes thickness.

Because hardness and fine radii affect fit stability, confirm mating features and tolerances on the core blocks before final assembly; sizes above are fixed ranges and should be treated as variant-specific, not interchangeable.