SKH51 Steel One-Step Core Pins

These one-step core pins are used in injection mold tooling where precise core positioning and repeatable ejection performance are required. The single geometry reduces stack-up effects during assembly, making them well-suited for automotive connector and sensor housing molds that cycle at high frequency and demand stable alignment between core and cavity.

They’re also a strong fit for medical device housings where dimensional control impacts cosmetic surfaces and part functionality. The hardened SKH51 steel resists wear at the pin-to-bore interface, helping maintain fit consistency across long production runs.

For appliance and consumer electronics enclosures using fine-stepped cores or inserts, the controlled shaft diameter range supports predictable fits without needing additional alignment features. Select the step and tip styles to match your core/bushing interface requirements, using the provided length and tolerance data to lock in placement accuracy.

• Single-step alignment for consistent core positioning
• Hardened steel to sustain wear resistance over repeated cycles
• Configurable shaft diameter for repeatable fits across builds

SKH51 is a high-performance mold steel commonly selected for precision core components due to its balance of wear resistance and toughness for repeated molding cycles. In hardened service, it provides stable hardness at the pin-to-bore contact area, supporting long-term dimensional retention.

• Heat treatment state: hardened condition (as specified for durable operation under repeated cycles)
• Wear resistance: designed to resist abrasion where the pin slides/locates within the guide or bearing bore
• Toughness trade-off: like other hardened steels, increased hardness improves wear resistance but requires proper design to avoid chipping under misalignment or shock loads

Compared with pre-hardened core steels, SKH51 in hardened form typically offers higher resistance to surface wear, which is beneficial where the fit must remain stable over many shots. If your application emphasizes maximum shock tolerance over wear, consider a softer or more impact-tough alternative, but you would generally give up some wear performance.

Correct selection starts by matching the pin shaft diameter (D/P) to the corresponding bore or locating feature diameter in the mold assembly. Choose from 0.8 ~ 10 mm and verify the nominal diameter (No. 1 ~ 13 mm) and step parameters for your specific core geometry.

Next, set the overall L dimension to the required engagement depth. L is available across ranges such as 6.5 ~ 100 mm (with sub-ranges including 6.5 ~ 13.99 and 14 ~ 100). Use the provided L tolerance: +0.01 / 0 / -0.05 to ensure you don’t under-engage or exceed clearance targets.

• Match D/P (0.8–10 mm) to the receiving bore for controlled fit.
• Select first step shape (1A–1E) and tip shape (No processing, B, C, G, R, T) to match your core positioning interface.
• Confirm step-related dimensions such as A (0.5–2 mm) and taper width C (0.1–1.1 mm) so the step seats correctly.

Where configurable sizes are used, keep mating feature tolerances aligned to the pin’s tolerance profile to maintain repeatable localization.