Inch Heavy Duty Ball Lock Ejector Punch Blanks (CRN Coating)

These CRN-coated ball lock ejector punch blanks are built for heavy-duty inch injection and press tooling where point retention and repeatable ejection are critical. The ball-lock action helps keep the punch point securely in place through high-cycle operation, reducing loosening risks that can disturb ejector alignment.

• Automotive interior and connector housings: Use the stable ball-lock design to maintain consistent ejection in multi-cavity tools where molded parts can stick after cooling and require reliable stripping forces.
• Appliance and industrial component molds: The CRN coating supports improved wear resistance at the punch point and shank contact areas, helping maintain performance during long production runs.
• General die/punch sets for inch tool holders: Inch-coded shank geometry and available length coding support straightforward selection for compatible ejector assemblies.

The CRN coating variant is especially suited when surface wear, galling, and repeated sliding at the lock interface can impact punch life and ejection consistency.

CRN (chromium nitride) coating is specified for these ball lock ejector punch blanks to improve surface wear resistance under repetitive sliding and localized contact stress. In heavy-duty ejection cycles, this coating helps reduce abrasion at the tip and enhances life where the punch point retention interface experiences frequent micro-movement.

• Wear resistance vs. toughness: CRN provides a hard, wear-protective surface, which generally improves resistance to polishing and edge degradation. The underlying punch steel toughness governs impact tolerance, so designs should avoid excessive bending loads.
• Heat treatment state: The input data does not specify the base steel grade or exact heat-treatment condition (e.g., quenched & tempered or nitrided). Selection should be confirmed with the supplier for the specific DAYTON blank specification used in your tooling.

Where multiple coating options exist, CRN is typically chosen when minimizing surface wear and maintaining ejection stability across production is the priority.

Selection starts by matching your ejector assembly requirements to the blank’s shank diameter (D) and coded length (L). Available ranges include D = 37 ~ 125 in and L (coded inch) = 250 ~ 450 (with additional coding sets such as 275 ~ 450 and 250 ~ 450). Choose the closest coded length that fits your ejector stroke and spacing constraints.

• Tip shape: Select the Tip Shape from H, J, K, L, N, O, R, V, X, Y, or Z to match the punch point geometry used in your cavity/core stripping design.
• Fit to tool holder: Use the P (0.376 ~ 1.251 in) and W (0.062 ~ 1.083 in) dimensions along with the shank diameter D to ensure the blank seats properly in the ejector/punch holder interface.
• Corner/edge feature (R): Verify the R (0.007 ~ 1 in) range matches the required fillet/edge radius for your locking and stress distribution needs.

Tolerance requirements are not provided in the input data; confirm tolerance class and fit limits during final tool design, especially for ball-lock seating consistency.