SKD11 Steel Tapped Ejector Punch Blanks

Tapped ejector punch blanks are used when the ejector system in an injection mold requires a punch that can be securely threaded into a holder. In practice, these blanks suit automotive connector and terminal molds where ejector punches must withstand repetitive cycling while maintaining positional repeatability.

They are also well-matched to consumer electronics mold builds that incorporate compact ejector layouts. The pre-tapped mounting shape allows faster fabrication of threaded ejector punches, reducing setup time and improving assembly consistency during die tryout.

For general-purpose production molds, the SKD11-equivalent D2 hardened steel base supports wear resistance at the shank interface and during punch action. The m5 shank diameter tolerance (+0.005/0) helps engineers achieve a controlled fit between the blank and mating threaded components, supporting stable performance across the tool’s service life.

• Use in threaded ejector punch fabrication where a tap-type mounting interface is required
• Choose SKD11 (D2 equivalent) for wear resistance in high-frequency production tooling
• Select m5 shank tolerance to support controlled assembly fit

This blank is made from SKD11, which is widely treated as a D2-equivalent tool steel for punch and die applications requiring hardness and wear resistance. The intent of SKD11/D2 is to provide stable performance under sliding and edge-loading conditions common in punch-type ejector components.

• Typical heat treatment: quenched and tempered to reach a hardened state suitable for tool use (final hardness depends on the maker’s cycle, but selection is oriented toward hardened operation).
• Hardness & trade-offs: increased hardness improves wear resistance at the shank interface, while excessive hardening can reduce toughness—careful tempering is used to balance both.
• Wear resistance: high for production environments involving repeated punch cycling.

If you compare to other common mold steels (e.g., high-alloy options used for extreme surface wear), SKD11/D2 is typically chosen for a cost-effective balance of hardness, grindability, and predictable hardening response.

To select the correct blank size, match the shank diameter D (6 ~ 25 mm) and the length L to your ejector punch geometry and available stroke space. This product offers L = 40–80 mm or L = 40–100 mm depending on the configuration you choose.

• Choose D within 6 ~ 25 mm for the threaded mounting interface in your ejector assembly.
• Use the m5 tolerance class for D (+0.005/0) to target a controlled fit with the mating bore/holder threads and reduce assembly variability.
• Verify S (20, 27, 28, or 36 mm) against the available seating/clearance features in your mold stackup.
• Confirm LC (full length alteration) within 30 ~ 90.1 mm to ensure the finished punch length meets your required ejector travel and tip positioning.

Because these dimensions are specified by the blank configuration (not fully configurable), confirm your cavity/core thickness and ejector alignment first, then select the blank that keeps the required projection after machining.