CRN Coated Extended Range Ejector Punches - Metric

Extended stroke ejection is critical in progressive die and transfer tooling where part geometry requires longer punch travel to fully release from the cavity. These metric ejector punches use an extended-range geometry and a CRN coating to support stable guidance and consistent cycling over long stroke lengths.

• For automotive and appliance stamping, the long punch length helps maintain positive ejection while the hardened tool-steel body resists alignment shift under repetitive load.
• In die casting die maintenance and core knock-out, the CRN surface helps reduce friction and galling at the sliding interface, improving repeatability during high-cycle production.
• For general fabrication tooling with deeper or taller components, choose this variant when you need reliable ejection with controlled wear to maintain dimensional stability over time.

This product is built from toughened tool steel (as specified in the description) to provide strong punch guidance and load-bearing stability for extended strokes. The CRN (chromium nitride) coating is applied to the working surfaces to improve wear resistance and lower friction, helping mitigate galling during continuous ejection cycles.

• Heat treatment state: hardened tool steel (per product description) to balance stiffness and toughness for guided ejection.
• Hardness & wear/toughness trade-off: the hardened base increases wear resistance and dimensional stability, while the tool-steel toughness supports repeated impact forces during part ejection.
• Wear performance: CRN coating reduces surface damage mechanisms that can develop under sliding contact and high cycling.

If you compare variants with different coatings, CRN is typically selected specifically for reduced friction and improved galling resistance under production wear conditions; the hardened tool-steel core maintains alignment under load.

Select dimensions by matching the punch’s stroke travel and guidance envelope to the die or transfer tool’s core/cavity geometry. This metric extended-range series offers a fixed point length (L1) of 25–30 mm and a fixed overall length (L) of 63–100 mm, which should be chosen to cover the required ejection travel while maintaining safe engagement and clearance.

• Shank diameter (D): choose one of 40, 45, 50, 56, 63 mm based on the holder bore and guidance requirements.
• Interface geometry: select the matching P dimension (20–39.95, 25–44.95, 30–49.95, 35–55.95, 40–62.95 mm) and W dimension (8–39.95, 9–44.95, 10–49.95, 11–55.95, 12–62.95 mm) to fit the specific mating die pocket features.
• Tip radius (R): range 0.2–19.975, 0.2–22.475, 0.2–24.975, 0.2–27.975, 0.2–31.475 mm should be selected to match part surface needs and reduce stress concentration.

For fit, confirm that the chosen D supports the guidance bore clearance after coating (CRN) and that the tip geometry (H/J/K/N/O/R/V/X/Y/Z) does not interfere with cavity land features.