JIS Standard Hardened Steel Inlay Core Pins Flat-Sided

Inlay core pins with flat-sided anti-rotation heads are used in precision injection mold tooling where a stable core location is required under frequent opening/closing cycles. The flat-sided feature provides anti-rotation control, helping maintain repeatable positioning so that downstream assembly accuracy is preserved.

• Automotive and electronics housings: Suitable for inlay core and boss-round inlay areas where ejector cycles can induce micro-rotation; the anti-rotation head reduces positional drift and helps maintain fit between mating mold components.
• Medical device housings and precision dispensers: Used to lock critical cores during molding and post-molding assembly, supporting consistent dimensional control and reducing wear-related variation at the bearing contact.
• Multi-part assembly fixtures: Works in tooling/fixture applications that require repeatable core location; hardened steel helps sustain low-wear operation for long service intervals.

This variant is engineered to pair tight shaft diameter control (selectable tolerances) with hardened construction, making it well-suited for low-lateral-motion and low-rotation alignment tasks.

This series is available in SKD61 and SKH51 hardened steel options, both common in JIS tooling. SKD61 (hot-work die steel; often used where thermal fatigue resistance is critical) is selected when toughness and long-term durability under cyclic heating are priorities. SKH51 (high-speed steel) is typically chosen for higher wear resistance at the sliding/contact zones, with a trade-off in toughness compared with many die steels depending on heat treatment.

• Heat treatment state: Hardened steel pins intended for precision tooling service; select the grade based on whether the application favors cyclic durability (SKD61) or contact wear resistance (SKH51).
• Hardness and performance: The hardened state supports low-wear operation, helping maintain the inlay core positioning surfaces over repeated ejection cycles.
• Wear vs. toughness trade-off: SKH51 generally emphasizes wear resistance, while SKD61 balances robustness and cyclic service behavior.

Final hardness (HRC) depends on supplier processing and the selected grade; confirm heat-treatment records for your production window.

To select the correct inlay core pin, match the required shaft diameter (D/P) and overall length (L) to the mold core/boss interface. Available D/P range is 1–16 mm with selectable shaft diameter tolerance references: 0/-0.005 or -0.01/-0.02. Choose the tighter/leaner fit based on how much positional repeatability your core-bearing system needs under cycle loading.

• Diameter selection: Pick the closest No. (nominal diameter) (1.5–20 mm) and the corresponding shaft diameter D/P (1–16 mm). Use the tolerance reference to control clearance/fit against the bearing bore.
• Length selection: Select L dimension within 12–30 mm. Length tolerance is +0.02/0 or +0.01/0, so align your stack-up accordingly.
• Tip geometry: Confirm tip step shape (A–E) and relevant dimensions such as A (0.51–5 mm), B (0.1–0.7 mm), and F bearing bore length (10–28 mm) so the inlay portion engages the core seats properly.

For anti-rotation performance, ensure the chosen flat-sided head orientation corresponds to the mating feature in your mold or fixture.