Alpha Treatment Ejector Punches with Locating Dowel Hole

Alpha Treatment ejector punches with a locating dowel hole are used in injection mold tooling where the punch must be precisely positioned inside a punch-side plate or die assembly. The locating dowel hole enables repeatable alignment with a punch retainer, reducing the risk of tip-to-cavity misregistration during fast cycling.

Common scenarios include automotive connector and terminal molds, where tight tolerances and stable ejection timing are required for thin, small features. The nano-crystallized surface concept helps improve wear resistance and lowers sliding friction, supporting consistent ejection over long production runs.

They are also suited for electronics and appliance housings that use high-volume ejector systems. Microtexture and the reduced coefficient of friction help maintain smoother motion and oil retention in the punch/bushing interface.

• Direct positioning via locating dowel hole
• Lower friction and improved wear for smoother ejection
• Nano-crystallized surface aimed at durability without losing toughness

This series uses an Alpha Treatment surface technology designed to increase surface performance without compromising core strength. The treatment provides nano-crystallization, which boosts near-surface hardness to improve wear resistance where the punch tip and sliding surfaces contact the die steel and bushing areas.

• Wear resistance: Enhanced by the nano-crystallized surface layer to reduce abrasion and keep dimensions stable.
• Friction behavior: Microtexture helps reduce the coefficient of friction and supports oil retention for smoother sliding.

Heat treatment state: The product description specifies an Alpha surface treatment with nano-crystallized texture. No specific bulk steel grade or target HRC is provided in the supplied data, so hardness values and tempering/quench details cannot be stated here.

Compared with conventional uncoated punches or basic carburizing/nitriding approaches, this variant emphasizes lower friction plus wear durability while targeting minimal dimensional and cutting-edge shape changes.

Select an ejector punch by matching the tip geometry, shank diameter, and overall length to the mating punch plate, retainer, and stroke requirements.

• Shank diameter (D): Choose within 10 ~ 45 mm to fit the receiving guide/bushing bore with appropriate clearance.
• Tip length (B): Available at 13, 19, 25, 30, 40 mm to match the required engagement into the die opening and support depth.
• Tip dimensions (P, W and changes PC/WC): Use P = 3 ~ 35 mm with W = 3 ~ 9 mm. If your design uses compensation for tip evolution, apply the provided modification ranges PC = 2.8 ~ 30 mm and WC = 2.8 ~ 8 mm.
• Overall length (L / LC): Use L = 60 ~ 120, 70 ~ 120, 80 ~ 120, or 100 ~ 120 mm depending on the offered option, and fine-tune with LC = 34 ~ 72 mm based on your retainer-to-cavity alignment stack.

Confirm tolerances and fit at the shank-to-guide interface (D) and verify that the locating dowel hole provides correct repeatable alignment to the punch retainer before committing to ejector timing.