Ejector Punch Blanks (Blank, Standard)

Ejector punch blanks are used as pre-machined diework components inside press and progressive tooling, where the punch must be guided precisely during forming and ejection. With the blank shank and a standard mounting part shape, these inserts integrate smoothly into typical punch holders and die assemblies to maintain positional stability.

Common scenarios include automotive and appliance stamped-part dies, where repeated cycles demand consistent punch alignment. They are well-suited for these applications because the tight shank diameter tolerance (+0.005/0, m5) supports stable guidance under load.

They are also appropriate for general-purpose die work that benefits from selecting the right steel grade for wear and speed: SKD11/D2 for balanced wear resistance, SKH51/M2 for higher-speed and hot-work performance, or powdered high-speed steel options for improved high-wear behavior.

• Secure mounting via standard mounting geometry
• Controlled alignment through m5 shank tolerance
• Grade selection supports different forming duty cycles

This series is offered in three steel options for ejector punch blank applications. SKD11 is the common “cold-work die steel” choice (equivalent to D2), providing strong wear resistance for moderate-to-high abrasive conditions with good toughness trade-offs.

SKH51 corresponds to M2 high-speed steel and is selected when the tooling sees higher surface speed or tougher wear demands. Powdered high-speed steel (SKH40 equivalent) is typically used to improve uniformity and wear performance versus conventional HSS, especially where consistent carbide distribution matters.

• Wear vs. toughness trade-off: D2 (SKD11) tends to favor wear with balanced toughness; M2 and powdered HSS typically prioritize high-wear endurance at the cost of more sensitivity to improper heat handling.
• Hardness/heat treatment state: the provided specifications list material grades but do not include heat-treatment or exact HRC values, so hardness should be confirmed with your die shop’s heat-treatment process for the selected grade.
• Manufacturing approach: these are blank punches intended for cut-to-size diework after receiving the chosen heat-treated steel base.

To select the correct ejector punch blank dimensions, match the shank diameter D first, then verify the length features required by your punch holder and die layout. The available D range is 1–25 mm, and the shank is specified with diameter tolerance +0.005/0 (m5) to support controlled alignment in the die.

Next, choose the length configuration based on your tooling stack-up. The L dimension is available in 30–50 mm or 40–100 mm ranges (depending on the variant). Confirm T (head/plate thickness) as either 3 mm or 5 mm for your mounting face requirements.

• Fit and clearance: use the m5 shank tolerance (+0.005/0) when specifying the mating guide bore/holder clearance; design for the worst-case maximum diameter.
• Full-length alteration (LC): available ranges include 15–49.9, 15–99.9, 40–80, and 40–100 mm—select the LC band that corresponds to your required protrusion/adjustment.
• Configurable vs fixed: L, T, and LC are variant-dependent, while the shank tolerance standard is fixed at the m5 specification for proper guidance.