Center Dowel Regular Punches - Metric, XNAP Coating

This center-dowel punch family is used as a locating and guiding element in progressive stamping dies and injection-mold secondary tooling where repeatable alignment is critical. In multi-station metal forming, the regular center dowel point stabilizes punch-to-workpiece positioning, helping minimize drift across long production runs.

• Progressive die guide & positioning: Match the metric shank diameters (D = 10–32 mm) to your die try-out locations to support consistent load transfer and reduce lateral play.
• Transfer and transfer-die applications: Use the extended punch length range (L = 71–150 mm) to maintain guidance through thick transfer stages.
• Injection tooling with ejector duty: Select the XNAP-coated variant to improve surface durability under sliding/friction during repeated actuation.

Tip shapes (H–Z) allow engineers to tune penetration and guidance behavior for different material thicknesses and die clearances.

The provided data specifies the XNAP coating, but does not include an underlying steel grade or heat-treatment cycle. Therefore, material selection should be validated against your mold supplier’s steel certification for the specific series 250301826570.

From a performance standpoint, the XNAP coating is intended to increase wear resistance at sliding and friction points, supporting longer service life for guide punches under repetitive ejector/actuation duty. Coatings typically improve surface hardness and reduce adhesive wear, but do not replace bulk toughness; excessive impact loading may still require adequate substrate strength.

• Heat treatment: Not specified in the input—request the lot-specific hardness and treatment state for the punch body.
• Hardness & wear vs. toughness: If the punch body is hardened, expect higher wear resistance and reduced edge wear, with a potential trade-off in toughness if impact loads are severe.

To select the correct center dowel regular punch dimensions, start by matching the shank diameter (D) and the overall length (L) to the corresponding die-set or tool plate features. Available D values are 10, 13, 16, 20, 25, 32 mm, and the fixed overall length range is L = 71–150 mm.

• Point guidance: Choose the tip shape (H, J, K, L, N, O, R, V, X, Y, Z) and verify the point length (L1): either 19–25 mm or 25–30 mm.
• Fit control: Confirm the supporting contact geometry using P (4–16 mm) and W (4–10 mm) dimensions, as these influence locating engagement in mating bushings/holes.
• Radius/transition: Use the specified R range (0.2–4.975, 0.2–6.475, 0.2–7.975, 0.2–9.975, 0.2–12.475, 0.2–15.975) to align with your clearance and lead-in requirements.

Where close guidance is needed, align your tolerances for punch-to-hole engagement based on your die drawings; specific tolerance values are not included in the provided spec.