JIS Standard SKD61 Steel Gas Release Straight Core Pins Flat-Sided

These SKD61 gas release straight core pins are used in injection mold tooling where stable ejection alignment and reliable venting are required, particularly in multi-cavity and high-cycle systems. The flat-sided head helps improve gas evacuation around the core pin interface, reducing trapped air and potential burn marks while maintaining consistent core movement.

• Automotive connector and sensor housings: Flat-sided head and integrated gas release support cleaner molding of fine features and thin-wall sections, where venting stability directly affects surface finish.
• Consumer electronics enclosures: Nitrided pin surfaces resist wear from repeated press cycles, helping maintain dimensional stability of the ejector/core alignment over long runs.
• Appliance and industrial plastic parts: The straight geometry and option for internal venting/cooling-hole arrangement support effective exhaust during filling and packing, improving cycle repeatability.

The nitrided SKD61 variant is suited for these applications because it combines tooling-grade toughness with improved surface wear resistance under frequent actuation.

The pin body is made from JIS Standard SKD61 steel, commonly used in hot-work and tooling applications (AISI H13 equivalent family). SKD61 is selected for good balance of toughness and heat-check / wear resistance during repeated thermal and mechanical loading.

After machining, the surface is finished with a nitrided treatment (as indicated by the product variant). Nitriding increases surface hardness and wear resistance while keeping the core comparatively tougher for shock resistance—this is a practical trade-off versus fully hardened high-wear steels.

• Expected performance: enhanced resistance to sliding/press-wear at the guide and pin contact areas.
• Heat treatment state: nitrided finish (surface-treated) for improved service life in high-cycle molds.

Because the provided data specifies nitriding but not the exact bulk hardness value in HRC, hardness should be verified from the manufacturer’s heat-treat/acceptance records for your specific batch.

Select the pin based on the shaft diameter (D/P), length (L), and head thickness to ensure proper core pin engagement and venting clearance in the mold.

• Choose D/P: available shaft diameter range is 6 ~ 16 mm. Match this to the core pin bore/corresponding sleeve inner diameter, using the product note that it supports H7-reference inner diameter compatibility for assembly.
• Choose L: available length options include 70 ~ 150 mm, 70 ~ 200 mm, and 70 ~ 250 mm. Confirm core travel envelope and ejector path so the pin fully engages without interference.
• Head thickness: JIS head thickness options are 4 mm(T4), 6 mm, or 8 mm (per the provided variants). Select head thickness to match the stripper/ejector stack-up and bearing/stop features.

Also confirm the tip geometry selection (B, C, G, R, T) and associated dimensions such as K (45–89°, 1–45°), C 0.1 mm, R 0.2 mm, and S up to 0.1–32 mm to maintain correct clearance to the mold opening and core interface.

For shaft diameter tolerance, use the reference tolerance -0.01/-0.02 when checking fit between the pin and the H7-referenced bore.