Metric XNA Coating Center Dowel Punches for Heavy Load

Metric center locating dowel punches like this one are used to establish repeatable center reference in heavy-load die sets and progressive tooling. In die set applications, the punch tip engages a matching receiver/locating hole to maintain alignment across repeated press cycles, reducing drift between operations.

• Automotive & industrial progressive die sets: Use with robust receiver geometry to support stable part positioning under high tonnage. The XNA coating improves corrosion resistance for tools exposed to coolant, mist, or shop-floor humidity.
• Die set maintenance fixtures: Locating punches help technicians realign components quickly and consistently. The heavy-load design and coating support longer service life when tools are cycled during setup.
• Precision workholding/fixture locating: Select the appropriate point length and tip shape to seat securely and maintain center registration for high-accuracy forming or assembly tasks.

The exact steel grade and hardness are not specified in the provided data, so selection should be aligned with your supplier’s tooling steel recommendation for heavy-load locating components. What is specified here is the XNA coating, which is intended to enhance corrosion resistance and improve durability at the punch/receiver interface.

• Material/coating role: The steel body provides structural rigidity for locating under load, while the XNA coating supports wear and corrosion control during repeated press cycles.
• Heat treatment state: Not specified in the provided data; confirm hardness level and treatment (e.g., quenched & tempered or similar) with the tooling documentation used for the production series.
• Wear vs. toughness trade-off: For locating punches, you typically balance surface durability at the tip with sufficient toughness to resist chipping; this is achieved through the chosen base steel and its heat treatment.

Correct sizing for center dowel punches depends on matching the punch shank size, effective point engagement, and overall length to the mating die/fixture geometry. Start by selecting the D (shank diameter) from 10, 13, 16, 20, or 25 mm to match the receiver hole/bore size in your base plate or die set.

• Overall length (L): Fixed at 80–130 mm. Choose the length that ensures full seating without bottoming against the base or damaging the receiver.
• Point length (L1): Select the required engagement from 13–19 mm or 19–25 mm to achieve stable center location.
• Tip shape: Choose the appropriate H, J, K, L, N, O, R, V, X, Y, or Z to match your punch/receiver seating geometry.
• Tolerance/fit: Use your standard die clearance for locating pins/punches; if receiver bores are precision-ground, keep assembly variation controlled to preserve repeatability. Dimensions D and L1/L are functional drivers; P, W, and R should be matched to the detailed drawing spec for the selected series.