Inch Ejector Punches

In injection and die tooling, these inch ejector punches are used to drive ejection action reliably after molding or forming. They are typically installed in stripper plates or ejector systems where consistent point geometry is needed to push molded parts off the cavity without distortion.

They fit well in die casting and press tool applications where repeated punching/stripping cycles demand wear-resistant punch tips; choosing M2 or A2 supports long service intervals under abrasive wear and cyclic loading.

For multi-cavity or progressive tooling, the coded point length ranges help engineers match required stroke length and maintain uniform ejection across stations.

• Use the appropriate tip shape (H, J, K, L, N, O, R, V, X, Y, Z) to align with part undercuts and ejection forces.
• Select shank diameter D = 18–250 in to maintain stiffness and prevent bending during ejection.

This ejector punch series is offered in M2 and A2 tool steels, selected for toughness-to-wear balance in punching and ejection duty. The steel selection primarily affects wear resistance, tip edge stability, and resistance to micro-chipping under cyclic contact.

• M2 (high-speed steel class) is commonly chosen where higher hot hardness and wear resistance are prioritized; it tends to deliver improved durability in demanding stripping cycles.
• A2 (air-hardening tool steel class) is often selected for good toughness and reliable performance in environments with less extreme heat than pure hot-work conditions.

Heat treatment is typically quenched and tempered for both tool steel options to achieve target hardness and toughness. Hardness and final performance depend on the selected grade and the delivered heat-treatment cycle for the punch point geometry.

Correct sizing ensures the ejector punch provides stiffness at the shank and the right effective working length at the tip. Start by matching the shank diameter D (in) = 18–250 to the ejector bore/guide system in the tooling plate to avoid excessive clearance or binding.

Next, select the coded point length B & L within the available ranges. Standard options are 150–250 in, while alternate groups provide ranges such as 150–400, 150–600, 175–625, 200–625, 225–625, 225–650, 250–650, and up to 250–700 (depending on the alternate type and group).

• Choose the Jektole group (J2, J3, J4, J6, J9, J12) that corresponds to the required point-length/geometry package.
• Set the P dimension = 0.05–1.625 in and W dimension = 0.062–0.5 in to satisfy the contact area and clearance to surrounding components.
• Use the R dimension = 0.007–0.007 in as the tip curvature constraint when matching to part surface requirements.

Where close fits are required, confirm tool drawing tolerances for ejector bores and ensure the selected D and point length do not create interference during full travel.