Taperless One-Step Core Pins - No Second Step

Taperless one-step core pins are used in injection mold assemblies where the core must be seated repeatably without a second locating step. In automotive connector housings, the one-piece locating profile supports stable core position during clamp-to-clamp cycles, reducing the risk of gradual misalignment that can cause flash or inconsistent cavity fill.

In medical device component molds (e.g., small housings and housings with fine features), the taperless geometry helps maintain consistent fit during assembly and improves repeatability of ejection behavior. The variant’s no-second-step design is especially suited when designers want a single, controlled seating surface rather than a staged alignment.

For electronics housings and progressive-injection hybrids, these core pins support reliable alignment under frequent tool operation. Select this specific variant to take advantage of the provided shaft/tip tolerance control for smooth, stable core positioning.

This series is available in SKH51, SKD61, NAK80, or SUS440C, allowing material selection based on wear resistance, toughness, and thermal performance needs. Shaft and tip features are manufactured for precision location, then supplied in a heat-treated condition suitable for core pin service.

• SKH51 (tool steel equivalent to AISI M2): high wear resistance; typically a better choice when surface durability under sliding/impact is critical, with a trade-off of reduced toughness versus more ductile grades.
• SKD61 (≈ AISI H13): excellent balance of hot-work durability and toughness, commonly used where repeated thermal cycling is expected.
• NAK80: good for fine surface replication and dimensional stability for precision cores.
• SUS440C: corrosion-resistant option with good hardness and wear performance for environments where corrosion control matters.

Hardness levels and specific heat-treatment state (e.g., quenched & tempered) are stated in the product description as quenched & hardened for these steel options.

Use the provided dimensional ranges to match the core pin to your mold core/cavity locating requirements. For shaft sizing, select D/P = 1 to 20 mm; choose A/AAC (tip diameter) = 0.4 to 5 mm to control tip seating engagement.

The one-step feature is dimensioned by L = 12 to 30 mm (overall L dimension) and the bearing bore length F = 10 to 28 mm. Tip geometry is selected via the specified tip shapes (B, C, G, R, S, T) and tip angle K = 21 to 60° (or 1 to 45° depending on the configuration). For step/travel control, ensure the fixed RE = 0.5 to 2 mm, C (taper width) = 0.1 to 4 mm, and CVC setting (0.1 to 1 mm at 0.01 mm increments) align with your mating pocket geometry.

• Tolerance matching: shaft diameter tolerance is 0/-0.005 mm and tip gradient tolerance is 0/-0.01 mm, so verify pocket/groove clearance to prevent interference on assembly.
• Fit considerations: since dimensions are controlled one-sided (negative), plan for the smallest delivered diameter when sizing retaining clearances.