SKH51 Steel With Engraving Straight Core Pins

Core pins with engraved identification are used in injection mold tooling where repeatable core positioning and fast, error-resistant assembly are critical. The convex character WOS engraving supports clear sequential identification during mold build-up, teardown, and in-process inspection—especially when multiple cavities or cores are mounted close together.

• Automotive connector and housing molds: helps technicians match the correct core pin to each cavity insert, reducing misalignment risk and supporting consistent dimensional performance during high-volume production.
• Medical device housings: the marked core components improve traceability during QA and rework, aiding controlled assembly workflows where accurate core location is essential.
• Consumer electronics enclosures: sequential identification streamlines automated and manual inspection of core modules, supporting reliable fit and alignment when pins are replaced or serviced.

This variant’s SKH51 quenched hardening steel and the specified L dimension tolerance (+0.05/0) make it suited for maintaining stable alignment under repeated mold operations.

The pin is made from SKH51 steel (high-speed steel type), selected for its ability to retain hardness and resist wear at the temperatures encountered in mold core tooling. The meta description specifies quenched hardening steel construction, indicating a heat-treated condition designed for durability in sliding/locating contact areas.

• Wear resistance: enhanced by the quenched hardened microstructure, supporting longer service life in core positioning applications.
• Toughness trade-off: as hardness increases after quenching and tempering, impact toughness can reduce versus lower-hardness mold steels—important when pins experience shock during assembly.
• Manufacturing process: steel is machined to the nominal core pin dimensions, then heat treated to the hardened state appropriate for SKH51 performance, followed by engraving of the ※Designation by WOS marking.

If alternative mold steels were used, softer grades may improve shock resistance but typically reduce wear life; hardened SKH51 favors high-cycle, wear-driven environments.

Selection is based on matching the nominal diameter and the shaft diameter range to the mating core support features. This product provides D/P (Shaft Diameter) of 1 ~ 4 mm with nominal sizes 1.5, 2, 2.5, 3, 3.5, 4 mm.

• Choose the nominal diameter: pick the listed No. (nominal diameter) that matches the pin bore/guide fit requirement.
• Account for shaft diameter tolerance: the shaft diameter tolerance is 0/-0.005 or -0.01/-0.02, so plan clearances accordingly to achieve consistent locating without binding.
• Match the length (L): available L ranges are 10 ~ 100 mm or 10 ~ 120 mm. Ensure the pin engagement length supports core alignment across the full opening/closing travel.

For axial fit, follow the specified L dimension tolerance (+0.05/0) to maintain stack-up consistency between locating elements. Character engraving format is fixed to ※Designation by WOS, while ring character count is configurable by model as 1 or 2 characters.