Large-Diameter Core Pins

Name: Large-Diameter Core Pins | Core Pins | Axiom Molds
Brand: Axiom Molds
Availability: InStock
Rating: 4.9 (128 reviews)

Shaft diameters exceeding standard range. For large-format automotive, industrial equipment, and appliance molds.

Products in This Category

JIS Standard SKD61/SKH51 Steel Straight Core Pins | OEM Available

Straight Core Pins in SKD61/SKH51 Steel with Core Pin. Engineered for plastic injection molding with custom options. Con

Large-Diameter Specification Guide

Shaft diameters exceeding standard range (typically >16–20 mm) require additional engineering considerations:

Engineering checklist: ① Verify bore straightness specification with our engineering team for diameters >20 mm. ② Standard material is SKH51 — SKD61 available as made-to-order. ③ Surface finish uniformity over longer grinding lengths is maintained to same standards as standard-diameter pins. For material grade, see our material comparison guide.

Do You Need Large-Diameter Pins?

Large-diameter pins are made-to-order and cost more than standard range. Confirm the requirement:

✅ You're in the right place if:

Your required shaft diameter is above 16 mm (JIS) or above 20 mm (DIN)
The feature being formed is a large-bore hole, pipe passage, or major structural cavity

🔄 Consider switching to:

Shaft diameter is within standard range (≤16 mm)? → Standard Straight Core Pins
Need a boss pillar rather than a through-hole? → Round Core Pins for Boss
Need replaceable tip on large pin? → Inlay Core Pins (check max diameter availability)

About Large-Diameter Core Pins

Standard core pin series cover shaft diameters up to approximately 16-20 mm. Certain applications — particularly in automotive structural components, industrial equipment housings, and large appliance parts — require larger pins.

Large-diameter pins are manufactured with the same material grades (SKH51, SKD61) and tolerance standards as their standard counterparts, with additional attention to straightness and surface finish uniformity over the longer grinding lengths involved.

For shaft diameters above 20 mm, verify bore straightness and surface finish specifications with our engineering team to ensure proper fit and alignment in your mold plate.

Application Scenarios

See how this product type solves real engineering challenges across different industries and applications:

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Large Bore Housing Features

Pain point: Industrial housings, pipe fittings, and large connectors require internal bores exceeding 10 mm diameter — standard core pin catalogs often stop at smaller sizes.

Why it fits: Large-diameter core pins cover bore sizes from 10 mm to 25 mm+ with maintained precision. SKD61 material provides the toughness needed to resist deflection forces on large-diameter shafts.

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Automotive Large-Bore Components

Pain point: Automotive intake manifolds, fluid housings, and structural components require large internal passages formed by oversized core pins — where pin deflection is the primary failure mode.

Why it fits: Heavy-duty construction with optimized length-to-diameter ratios minimizes deflection. Available in both JIS and DIN standards to match regional mold building conventions.