DIN Standard SKH51 Steel Gas Release Taperless One-Step Core Pins Flat-Svc

This taperless, one-step gas-release core pin is used in injection mold tooling where controlled venting is critical to reduce trapped air and improve part filling. The extended flat-side anti-rotation feature (SV/SVC to the bottom) supports stable positioning in the core, helping maintain vent performance over repeated cycles.

• Automotive connector and housing molds: Use for thin-walled sections where trapped air near deep cores can cause burn marks or short shots. The taperless geometry helps maintain consistent alignment and venting without relying on a tapered seating method.
• Consumer electronics housings: Suitable for high-cycle runs needing reliable core support while evacuating gas from narrow cavities. The extended flat section improves seating stability, reducing rotational movement.
• General steel mold cores for multi-cavity layouts: Fits standard core pin design expectations under DIN requirements, supporting compatibility with existing core blocks and venting strategies.

The SKH51/SKD61 material option supports wear resistance for steel molds, making it practical for production environments.

The standard steel option is SKH51 (DIN standard), typically selected for tooling that requires strong wear resistance with adequate toughness. This grade is supplied as a quenched and hardened condition (appropriate for precision core pin service).

An alternative available grade is SKD61, which is commonly used in injection molding due to its balance of heat resistance and toughness. Compared with high-hardness tool steels like SKH51, SKD61 can provide improved toughness at the expense of some maximum wear performance depending on the final hardness level.

• Quenched & hardened state: Supports stable hardness for repetitive sliding/impact and maintains dimensional stability during molding.
• Wear vs. toughness trade-off: Higher hardness generally increases wear resistance but can reduce toughness; select based on cavity pressure/impacts and cycle life targets.
• Heat treatment requirement: Choose grade and heat-treatment spec aligned with your expected molding temperature and run length.

Select dimensions by matching the shaft diameter (D/P) to the mating core bore and choosing the vent-specific diameters that align with the cavity vent land requirements. This series supports D/P = 1 ~ 13 mm and A/AAC (tip diameter) = 0.4 ~ 2 mm.

• Length (L): Choose from the provided ranges L = 16.5 ~ 100 mm, 16.5 ~ 120 mm, 6.5 ~ 100 mm, or 6.5 ~ 120 mm based on core thickness and the required protrusion.
• Gas-release geometry: Ensure DC (gas release section diameter) = 0.92 ~ 12.92 mm and N (gas release section diameter) = 0.3 ~ 10 / 0.5 ~ 15 mm match your venting channel scale. When DC = D, DCX is applied.
• Taperless one-step seating: Because the pin is taperless and uses the extended flat SV (SVC to the bottom), verify the anti-rotation slot/feature depth so the flat reaches the bottom as intended.

Use the provided L tolerance (0/-0.05, +0.02/0, +0.01/0) and tip gradient tolerance values to maintain proper core support and vent clearance. Confirm tip gradient and chamfer specs for the chosen tip angle (K = 21~60° or 1~45°) to avoid interference.