JIS Standard Steel Ejector Punches for Heavy Load with Dowel Holes

Heavy-load ejector dowel punches are used in injection mold tooling when precise hole formation and long cycle-life are required. They are commonly specified for automotive connector and sensor housings, where repeated ejection and tight alignment must be maintained across high-volume runs.

In these molds, the HX coating supports wear and corrosion resistance at the punch-to-hole interface, helping preserve dimensional stability and repeatable hole geometry.

Another application is medical device housings and precision components, where dowel hole accuracy affects downstream assembly alignment. The availability of standard and spring and pin reinforced structures helps stabilize heavy-duty performance during high load ejection events.

Choose tip geometry (round, rectangle, oblong, double flatted round, radius rectangle) to match the target cavity/core features and ejector travel conditions, improving the consistency of hole forming in real production tooling.

This series is described as JIS Standard Steel ejector punches for heavy load hole forming, supplied with an HX coating for improved wear and corrosion resistance. The exact steel grade and heat-treatment state are not provided in the available specifications, so confirm the specific grade/condition from your quotation documentation for hardness and tempering details.

For mold engineers, the functional intent is clear: the combination of a steel substrate and HX coating is meant to reduce surface degradation during repeated punching and sliding contact, supporting consistent hole formation. In duty cycles with corrosion risk (coolant, humidity, or cleaning chemicals), the coating helps protect the shank and tip bearing areas.

• Hardness (HRC): Not specified in the provided data—verify per the selected JIS steel grade and heat treatment.
• Wear resistance vs. toughness trade-off: Typically depends on the quenched & tempered condition and coating thickness; not specified here.

Select the punch dimensions by matching the tip form and shank geometry to the mold cavity/core hole feature and the ejector system guidance.

• Shank diameter (D): choose within 10 ~ 45 mm to fit the ejector plate/guide bore requirements and maintain stable alignment.
• Tip dimensioning (P and W): select P = 5 ~ 35 mm and W = 5 ~ 9 mm based on the desired hole size/shape.
• Tip length (B): options are L or S, selected to control penetration depth and hole forming engagement.
• Overall length (L): available ranges include 60 ~ 130, 70 ~ 130, 60 ~ 100, or 70 ~ 100 mm, depending on your stack height and stroke design.

Confirm the LC (full length change) range (e.g., 53 ~ 129.9 or variants up to 129.9) to ensure clearance and correct travel under compression. Tolerance and fit values are not provided; use your standard mold build-up tolerances and verify any clearance requirements for dowel hole alignment.