Large Diameter Straight Core Pins

These large-diameter straight core pins are used in injection mold tooling where the core must be repeatedly located with high stability, especially during core assembly and during the high-force opening/closing cycles. Their straight geometry provides consistent guidance along the seating axis, helping maintain alignment throughout production.

Automotive connector and sensor housings: In multi-cavity molds that require tight core-to-cavity registration, large diameters (D range 10–60 mm) increase guidance area, improving resistance to misalignment under clamp and ejection loads.

Consumer electronics enclosure cores: For thin-wall or precision cosmetic parts, the option of polished or lapped finishing supports smooth positioning and reduced friction during assembly, supporting reliable, repeatable core location.

Medical device and optics-related housings: When uniform alignment directly affects downstream fit and surface quality, selecting this straight-pin variant with controlled corner chamfering (C 0–0.5 mm) helps achieve repeatable seating geometry in core manufacturing.

• Why this variant fits: large-diameter, straight alignment combined with lapped/polished options supports precise positioning and stability.

This pin series is supplied in NAK80 or STAVAX ESR, both selected for core alignment components requiring dimensional stability and good surface performance. Choice of steel allows you to balance wear resistance and finishing behavior against toughness needs for your mold duty.

• NAK80: Generally chosen for applications that benefit from high polishability and stable machining for precise fit surfaces. Heat treatment is typically delivered in a hardened state appropriate for precision core pins; final hardness should be verified against your supplier documentation when specifying for abrasive environments.
• STAVAX ESR: An ESR-refined tool steel grade known for cleanliness and consistent properties, supporting reliable performance when fine surface finish and uniform behavior are required.

Finishing impact: Lapped or polished finishing improves contact smoothness and reduces micro-scratching at the seating interface. The main trade-off is that very high hardness can reduce toughness; therefore, confirm the intended service conditions (load, shock, and wear) when selecting between NAK80 and STAVAX ESR.

Select by matching the pin’s seating/interface requirements to your core’s alignment features. The series provides a shaft diameter D of 10–60 mm (and a related nominal diameter No. also 10–60 mm), with shaft diameter P available in 8–50 mm depending on the variant.

Choose the L (length) within 20–100 mm to ensure adequate engagement depth in the core assembly without bottoming out. Use T (head thickness) of 4–8 mm to match the mating support or locating surface thickness in the mold stack.

• Corner chamfering (C): set C in 0–0.5 mm to manage lead-in at the interface and reduce edge interference during assembly.
• Head thickness change (TC): account for TC = 0 or 2–7.9 mm when compensating for spacing between components.
• Fit guidance: because diameters are configurable within the specified ranges, confirm the required press/slide fit strategy and the allowable tolerance stack-up in your core location system before finalizing the D/P choice.