Center Dowel Ejector Punches - RW Coating

These center dowel ejector punches are used in injection molding and die-casting toolsets where repeatable part ejection depends on stable axial guidance.

• Automotive and appliance molding: Pair the locating dowel hole with press tooling bushings to maintain punch coaxiality during high-cycle ejection; the RW coating variant supports improved surface wear performance over long runs.
• Thin-wall housings: Select the appropriate round/rectangle/oblong tip shapes to match gate and ejection layouts while keeping punch alignment consistent; the shank dowel hole reduces side-load sensitivity during stroke-to-stroke repeatability.
• Multi-cavity or hot-runner molds: Use the hardened SKD11-equivalent construction for abrasion resistance when ejector motion is frequent and abrasive carryover is expected; the M5 shank diameter tolerance helps precision assembly alignment to the mold base and guides.

Overall, the RW-coated surface and SKD11-equivalent wear-resistant steel make this variant well-suited to applications that prioritize guidance stability and durable ejector performance under cyclic contact.

The punches are manufactured from SKD11 Equivalent (D2) tool steel, selected for its high abrasion resistance in sliding and ejection wear conditions common to tooling. This grade is typically supplied in a hardened condition to improve surface durability; for this product line, the key functional expectation is abrasion/wear resistance for long production cycles.

• Wear resistance vs. toughness: D2-style steels offer strong wear resistance, but they generally require correct heat treatment and careful handling to avoid excessive brittleness under impact loads.
• Manufacturing process: The blanks are machined to the specified shank and tip geometries, then heat-treated to achieve the intended hardness for punch service, followed by surface finishing and the RW coating to further reduce frictional wear.

Compared with softer steels used for non-wear-critical ejectors, the SKD11-equivalent/D2 selection improves resistance to scuffing and abrasion, supporting longer maintenance intervals in high-cycle molds.

Select dimensions by matching the ejector punch geometry to the mold core/cavity ejection design and the available guide system.

• Shank diameter (D): Choose from 10 ~ 45 mm to suit your ejector bore and guide specification; the description indicates an m5 shank diameter tolerance for precise assembly alignment.
• Tip geometry: Confirm the tip shape (round, rectangle, oblong, double flatted round, radius rectangle) and the related tip dimension options: P = 3 ~ 35 mm, W = 3 ~ 9 mm, and tip corner radius R = 0.15 mm.
• Length stack-up: Use L = 70 ~ 120 mm (multiple L ranges provided by variant) and the full length alteration LC = 34 ~ 72 mm to align with stroke requirements.
• Tip dimension alteration: Apply PC = 2.8 ~ 30 mm and WC = 2.8 ~ 8 mm when fine-fit is needed for contact area and ejection clearance.

When installing, ensure the chosen D and the M5-tolerance fit are compatible with your mold’s guide bushing and ejector alignment strategy to minimize lateral load and bind risk.