Two-Step Core Pins Head T=4 mm

Two-step core pins are used in injection mold tooling to ensure repeatable alignment between the core and cavity halves during assembly and clamping cycles.

• Automotive connector and sensor housing molds: Use the defined head thickness (T=4 mm) and controlled two-step seating to maintain core position under vibration and high clamp-force repeatability, especially when fine positional stability is required between multiple locating features.
• Medical device housings and precision housings: The guided shaft and tip geometry support consistent positioning for thin-wall or high-tolerance parts, helping reduce drift and ensuring the mold’s core-to-cavity offset remains stable across production runs.
• Industrial appliance and electronics enclosure molds: When wear from repeated cycling is a concern, select a suitable hardened steel option from the available materials to improve abrasion resistance at the contact and bearing bore interface.

This variant is suited to applications where locating repeatability and controlled seating are critical, and where the T=4 mm head thickness must match engineered core layouts.

This core pin series supports selectable steel options tailored to wear and toughness needs during repeated mold cycles. Available materials include DH2F, SKH51, NAK80, SKD61, SUS440C, and MAS1C.

• SKH51 is an AISI M2 equivalent high-speed steel typically used for superior wear resistance; it is known for high hardness, with a common manufacturing outcome in the ~HRC 60+ range depending on heat treatment.
• SKD61 is commonly treated as an H13 equivalent tool steel, offering a balance of toughness and hot-work capability; parts are usually quenched & tempered to achieve a hardened condition with good impact resistance compared with higher-carbon wear steels.
• NAK80 is often selected for corrosion resistance and dimensional stability in molds, while SUS440C provides strong wear performance with good hardness after hardening.

Material selection typically trades wear resistance (higher-hardened alloys) against toughness and resistance to edge chipping (more balanced tool steels). Final hardness and wear behavior depend on the supplier’s heat treatment route for the chosen grade.

To select the correct dimensions for this two-step core pin, match its diameter, steps, and length to the mold’s core positioning and locating features.

• Shaft diameter (D/P): Choose from 1 ~ 16 mm to match the required hole/bearing bore size. Nominal diameter range is 1.5 ~ 20 mm depending on configuration.
• Overall length (L): Select L = 11 ~ 30 mm so the pin properly guides and supports seating without over-insertion.
• Step geometry: Pick the first step shape (CA/CB/CC/CD/CE) and second step shape (A/B/C/D/E) that correspond to your core layout. The tip diameter (E) is 0.5 ~ 5 mm, and the first-step diameter type A is 0.5 ~ 5.01 mm.
• Bearing bore length (F): Use F = 10 ~ 30 mm to ensure stable contact in the locating zone.

Maintain assembly-fit control: the design references L dimension +0.02/0, so confirm that your cavity/core seating stack-up and any locating clearances align with this tolerance requirement. Configure step shapes and chamfers (e.g., G and related parameters) to reproduce the intended seating profile.