Ejector Pins & Core Components

Ejector pins, stepped ejector pins, core pins and ejector-sleeve retention parts — standard sizes bought online, and non-standard geometry made from your drawing.

Material and hardness

Our standard pins are SKD61 (H13 equivalent, JIS G4404), vacuum hardened and then nitrided: 60±2 HRC at the surface, 42±2 HRC in the core. That split is the point, not a compromise. A pin hardened to 60 HRC through its whole section resists wear and then snaps, because nothing ductile is left to absorb a side load. A pin at 42 HRC throughout survives the side load and galls in the hole. Nitriding puts the hard case where the rubbing happens and leaves the core tough enough to bend slightly instead of breaking.

Other materials and through-hardened specifications are quoted on request — tell us the standard you work to (DIN, JIS, HASCO, DME, Misumi equivalent) and we quote against it.

Sizes

Standard straight pins run Ø1 to Ø20 mm, with common stock lengths from 100 to 300 mm. Stepped pins, shouldered pins, blade and rectangular ejectors, and any diameter-to-length combination outside the standard range are made to drawing.

Three things worth knowing before you order

• Cutting to length removes the case at the cut face. Shortening at the head end is normal practice. Cutting so that the new end becomes the working end running in a guide hole creates a soft wear point exactly where the pin is loaded.
• Never regrind the diameter. Grinding removes the nitrided case over the whole working length. The pin still measures correct and lasts a fraction of its life.
• Thin long pins cost more than thick short ones. From real per-specification supplier data, a Ø1×200 pin prices above a Ø3×150 — less steel, higher price, because a thin long pin deflects under the grinding wheel and scraps more often. If a pin position has any freedom in it, going one diameter up can reduce your cost.

Sending a stepped or non-standard pin for quotation

• A dimensioned drawing, or a sketch with dimensions — both are enough to quote
• Pin, step and head diameters, step position and overall length
• Material and hardness, or the original part you are replacing
• Which dimensions are critical, and their tolerance
• Quantity, destination and required date

If some of those are "whatever is normal for this part", say so — we quote to normal practice and write down the assumptions so you can correct them. Website reference dimensions do not replace final drawing approval.