M2 Steel Rectangular Ejector Pins with Engraving - Flat-Head

These rectangular ejector pins are used in injection mold tooling where reliable part release and traceability of ejector components are required. The engraved designation helps maintain clear tool/work instructions across maintenance cycles.

• Automotive and industrial connector housings: the flat-head configuration with T=4 mm supports stable seating in precision ejector assemblies, helping maintain repeatable ejection under high cycle conditions.
• Die-cast and injection-mold cores with marked tooling: the concave engraving (※Designation by WOS) provides durable identification for rapid inspection, allowing engineers to correlate specific ejector pins to cavity/core sets.
• Multi-cavity molds: controlled trimming supports consistent pin seating so ejection repeatability is maintained across cavities, reducing variation in part release.

Built from SKH51 tool steel, the variant is suited for tooling environments that demand strong wear resistance and dimensional stability during sustained ejector motion.

This product is specified in SKH51 tool steel, commonly aligned to AISI M2 equivalent in function (high-speed steel class). Its quenched & hardened tool-steel condition is intended to deliver high wear resistance at the ejector working surfaces.

• Hardness: the hardened tool-steel state provides durable cutting-edge-style wear performance; hardness is typically selected to balance wear resistance with acceptable toughness for ejector duty.
• Wear resistance vs. toughness: higher hardness improves scuffing and abrasion resistance during repeated ejection, while sufficient toughness is needed to avoid chipping at the pin tip and flat-head contact areas.
• Manufacturing process: steel is quenched and hardened, then typically tempered to stabilize hardness and reduce brittleness for long-run ejector operation.

Compared with lower-alloy case-hardened steels, SKH51 hardened performance is generally better for severe sliding/impact wear, while requiring correct heat-treatment control to maintain toughness.

Selection starts by matching the ejector pin geometry to the cavity/core ejector layout and the available space for stroke and guidance. Use the provided ranges to engineer fit and seating.

• Shaft diameter (D): choose D = 2 ~ 10.5 mm to match the guide bore and minimize clearance-induced wobble.
• Tip dimensions: select P = 0.8 ~ 3 mm and W = 0.3 ~ 0.7 mm to align with the part-contact area and reduce stress concentration at the release surface.
• Length (L): pick L = 40 ~ 250 mm (or 50 ~ 250 mm as applicable) to achieve the required protrusion and safe engagement depth.
• Dimension N: use N = 23 ~ 40 mm to satisfy the stack-up between ejector plate, support, and any retention features.

The flat head has a T=4 mm thickness, which must fit the ejector assembly step/seat. Engraved character count (1–5) and concave character style are available options, while the ※Designation by WOS wording is fixed.