Precision Two-Step Core Pins - M2/H13 Steel, Head T=4 mm

Two-step core pins like this are used in injection and die tooling where the mold needs repeatable, staged location during opening and closing. The stepped profile supports a controlled engagement sequence so alignment is achieved at the first stage and then refined at the second stage, improving positional stability under cycle loads.

• Automotive connector and housing molds: Ideal for guiding pin/guide interfaces where small positional errors can cause misalignment of inserts or ribs. The fine L tolerance (+0.01/0) and tight shaft fit help maintain consistent ejection and parting behavior.
• Medical device housings: Suitable for precision core assemblies that require stable alignment to preserve critical wall thickness and surface transitions. The wear-capable steel selection helps maintain location accuracy over many mold cycles.
• Consumer electronics shells: Useful in multi-cavity tools that see frequent opening/closing. The two-step geometry reduces the risk of drift by ensuring full contact at both stages.

This variant is suited to these applications because it combines a two-step locating strategy with controlled shaft and length features for stable fit repeatability.

This product is offered in M2/H13 steel options, mapped to common mold steel families listed as SKH51 and SKD61. SKH51 is typically used as a high-speed steel (often associated with AISI M2 class), providing high hardness for wear and abrasion resistance. SKD61 corresponds to AISI H13 class, valued for toughness and good hot-work performance in injection tooling.

• Hardness & wear vs. toughness trade-off: High-hardness grades (SKH51/M2-type) tend to excel in wear resistance; SKD61/H13-type commonly balances wear with improved toughness for shock-prone tooling.
• Heat treatment state: For core pins, these steels are generally quenched and tempered to achieve the target hardness before service; surface finishing or secondary processes (when specified by the builder) can further improve wear behavior.

For the best results, select the grade based on expected contact wear and the severity of mold pressure and thermal cycling.

Select the two-step core pin based on the required shaft diameter (D/P = 1 ~ 16 mm), the overall L dimension (L = 6.5 ~ 30 mm), and the end geometry that mates with your core/cavity locating surfaces.

• Match the locating diameter: Choose D/P within 1 ~ 16 mm to fit the bearing/guide bore intended for staged engagement.
• Verify engagement depth: Ensure your target length requirement falls within L = 6.5 ~ 30 mm, and confirm the bearing bore length compatibility using F (12 ~ 28 mm) where applicable for the supporting feature.
• Choose step shapes: Select the first step shape from CA~CE and the second step shape from A~E to align the staged contact area. Tip and intermediate dimensions must be consistent with A (0.5 ~ 5.01 mm) and E (0.5 ~ 5.01 mm).
• Tolerance & fit: This variant specifies a tight L dimension tolerance (+0.01/0), supporting stable ejection fit and repeatability. If your design is sensitive, prioritize the L callout and ensure clearance in the mating bore.

Use the available configuration parameters (step shapes, taper width, chamfers) to replicate your mold’s staged locating geometry while keeping D/P and L within the provided ranges.