One-Step Stepped Center Pins
Single transition stepped center pins designed to support sliding hollow sleeves. Available in cylindrical or anti-rotational flat-sided configurations.
Products in This Category
JIS Standard M2 Steel One-Step Center Pins Flat-Sided
M2 steel flat-sided core pin.
M2 Steel One-Step Center Pins | One-Step Shape, SKH51 Build
One-step core pin variant.
DIN Standard Nitrided SKD61 Steel One-Step Center Pins
DIN standard sizing nitrided.
JIS Standard M2 Steel One-Step Center Pins
M2 custom fit pin.
SKH51 Steel One-Step Center Pins
SKH51 high-toughness core pin.
DIN Standard SKD61 Steel One-Step Center Pins (Nitrided)
DIN standard nitrided core pin.
DIN Standard SKD61 Steel One-Step Center Pins (T=4 mm Head)
4mm thick head, DIN standard.
Hardened Steel One-Step Center Pins SKD61 | 4 mm Head
Hardened SKD61 core pin.
JIS Standard M2 Steel Stepped One-Step Center Pins
Stepped guiding one-step pin.
SKD61 Steel One-Step Center Pins with Cooling Hole - Nitrided
Equipped with internal cooling path.
Selection Matrix: JIS vs. DIN Standard One-Step Pins
Verify dimensional differences when swapping between JIS and DIN standard core pins:
| Standard Specification | Head Diameter (K) | Head Thickness (T) | Interchangeability Note |
|---|---|---|---|
| JIS Standard | Slightly smaller (e.g. D+3mm) | Thin head: T = 4.00mm (+0/-0.02) | Common in Asian electronic and automotive mold standards. |
| DIN Standard | Slightly larger (e.g. D+4mm) | Thick head: T = 5.00mm (+0/-0.02) | Requires deeper pocket machining; standard in European molds. |
Decision rule: First verify JIS or DIN based on your mold plate origin — they are not interchangeable. Then choose extra-precision only if your bore clearance is under 0.01 mm. For material grade selection, see our material comparison guide.
Boundary Check: Cylindrical vs. Flat-Sided Core Pins
Ensure correct rotational locking selection for your mold core inserts:
Choose Flat-Sided (Positioning) Pins If:
- The core pin tip has an angled, slotted, or non-symmetrical molding feature.
- The core pin must be locked in a fixed rotation to prevent part mismatch.
Choose Standard Cylindrical Pins If:
- The core pin tip is flat and symmetrical.
- No anti-rotational backing pocket machining is available on plates.
Application Scenarios: One-Step Stepped Pins
Key industrial applications for one-step center core pins:
Deep Boss Vacuum Stiction
During mold opening, deep-cavity plastic parts stick tightly to core pins due to vacuum pressure, stalling cycle times.
Why it fits: The stepped shoulder profile breaks vacuum stiction by admitting air pressure between the core and sleeve.
Angled Molding Surfaces
Cores forming non-symmetrical, angled inner bosses rotate under plastic pressure, causing mold misalignment.
Why it fits: The flat-sided head locks rotation, ensuring the angled core tip stays perfectly aligned.
Frequently Asked Questions
How do JIS standard and DIN standard one-step center pins differ in head dimensions?+
When is a flat-sided positioning one-step center pin required instead of a round one?+
How does a one-step pin prevent vacuum stiction during part ejection?+
About One-Step Stepped Center Pins
One-step center pins have a single diameter transition between the head and the molding shaft. This design provides a guided fit through the ejector plate while the smaller-diameter tip forms the core of the boss or hole. Available in JIS and DIN standards with cylindrical or flat-sided (anti-rotation) configurations. Flat-sided variants lock into the backing plate to prevent angular misalignment on non-symmetrical features.
Engineering Resources
Need a Custom Quote?
Specify head style (JIS/DIN), head thickness, shaft diameter, and cylindrical or flat-sided configuration. Custom lengths and tolerance upgrades available.