RW Coat SKD11 Equivalent (D2) Center Dowel Ejector Punches

These center dowel ejector punches are used in precision injection tooling and metal forming dies where repeatable axial alignment between cores and ejector sections is critical. The locating dowel hole supports stable center positioning, helping reduce runout during high-cycle punch and die operations.

• Automotive and appliance stamp tooling: Ideal for die sets that require consistent ejection force and tight center guidance across multiple cavities, especially when wear and alignment drift affect part quality.
• Progressive or multi-stage dies: Suited for operations that cycle quickly and demand reliable seating; the stepped shank geometry improves ejector guidance and maintains repeatable location under load.
• Small precision parts: When using shorter center lengths and fine tip dimensions, the configured shank diameter range (10–45 mm) enables stable guidance without over-sizing.

The SKD11-equivalent (D2) steel base combined with RW Coat wear-focused surface treatment makes this variant well matched to environments where sliding/impact resistance and dimensional stability are both needed.

This product is built from SKD11-equivalent (D2) die steel, selected for a balance of wear resistance and toughness in punch and ejector tooling. The RW Coat surface treatment is used to improve wear performance at the guided and contacting surfaces, supporting longer service intervals.

• Material equivalence: SKD11 is commonly treated as an H11/H13-class D2-equivalent die steel family; for punch tooling selection, it’s typically chosen when strong abrasive and adhesive wear resistance are required.
• Heat treatment: Typically supplied in a hardened and tempered condition suitable for ejector applications; final hardness and temper are controlled per tooling requirements.
• Hardness & trade-offs: Higher hardness improves wear resistance and punch edge stability, while reducing toughness if pushed too high—so selection should match the severity of impact and load.

Compared with less wear-focused tool steels, D2-family materials better resist abrasion; compared with higher-toughness grades, they may trade some impact resistance for longer wear life in steady stamping/die cycles.

Select the center dowel ejector punch dimensions by matching the shank diameter and lengths to your ejector system’s guidance and cavity/core alignment requirements. The available D (shank diameter) range is 10–45 mm; choose the diameter that matches (or supports the designed guidance clearance of) the mating bore in the die base.

• Tip geometry: Choose tip shape (Round, Rectangle, Oblong, Double flatted round, Radius rectangle) and set the P (tip dimension) from 2.5–35 mm, with tip corner R limited to 0.15 mm.
• Tip length (B): Select B from the provided variants (L, S, X) that align with the required engagement depth to the mating punch pocket or center feature.
• Overall length (L): Use the applicable L range from the offered sets (e.g., 50–150, 60–150, 70–150, 80–150) to ensure sufficient stroke and column strength.
• Full length alteration (LC) & tip alteration (PC): Apply LC from 25–149.9 mm (per configuration) and PC from 1.25–17.5 mm to fine-tune engagement without changing base geometry.

Check tolerance/fit at the shank-to-bore interface; the product description references m5 shank diameter tolerance, so confirm your guidance bore tolerance strategy to maintain stable center positioning while avoiding binding.