Straight Core Pins

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

Uniform-diameter pins for simple cylindrical cavities. Four variants by tip and venting configuration.

Product Categories

Without Tip Processing

Standard end face, most economical option.

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With Tip Processing

Precision-ground tips for superior surface finish.

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Gas Release

Venting flats or SVC channels for trapped gas evacuation.

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With Engraving

Convex/concave characters for date codes and symbols.

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Quick Selection: Which Straight Core Pin?

Answer two questions to find the right variant for your application.

What is the primary requirement for the molded hole?

Surface finish Ra < 0.4 →With Tip Processing — precision-ground tip for visible or cosmetic features.

Deep hole / blind hole venting →Gas Release — prevents burn marks and short shots from trapped air.

In-mold marking (date code, lot #) →With Engraving — eliminates post-mold marking operations.

Functional hole only →Without Tip Processing — most economical standard option.

Do you also need gas venting on a tip-processed or engraved pin?

Yes, gas trapping is a concern →Consider combining features — Gas Release variants are available with tip processing.

No, single feature is sufficient →Proceed with the type selected in Step 1.

Is a Straight Core Pin the Right Type?

Straight core pins handle uniform-diameter internal features. Confirm your cavity matches:

✅ You're in the right place if:

The internal feature is a single uniform diameter — a round hole, pin gate, or cylindrical boss
No diameter transitions or stepped sections are required inside the cavity
The hole can be formed in one cylindrical pass during molding

🔄 Consider switching to:

Need two or more internal diameters in one feature? → Stepped Round Core Pins
Want faster pin replacement with straight bore retention? → Taperless Core Pins
Forming a boss pillar or standoff? → Boss / Round / Inlay Pins

Technical Overview

Straight core pins form cylindrical internal features — round holes, pin gates, and hollow bosses. Their uniform shaft simplifies both mold plate boring and pin replacement during maintenance.

The choice between tip-processed and non-tip variants depends on the required surface quality of the molded feature. Where the hole is purely functional and hidden, a standard no-tip pin is sufficient. For visible or precision features, tip-processed pins deliver a cleaner cavity surface with reduced ejection force.

Gas release variants address a specific engineering problem: in deep or blind cavities, compressed air has no escape path. Without venting, the trapped gas superheats and causes burn marks, short shots, or surface discoloration. Available in Flat-Sided, SVC (Semi-circular Vent Channel), and GVFC (with sintered metal filter) configurations.

Engraved variants eliminate post-mold marking operations by forming date codes, lot numbers, or recycling symbols directly on the molded part during the injection cycle.

JIS B 6131DIN 9861DMEHASCOMISUMI

Frequently Asked Questions

What tolerance grades are available?+

Standard JIS tolerances on shaft diameter. Extra-precision grades (+0/-0.005 mm) available for minimal-clearance applications.

Do I need tip processing?+

If the feature is visible on the finished product or requires Ra < 0.4, yes. For hidden functional holes, no-tip pins are sufficient and more cost-effective.

Can straight core pins be cut to custom lengths?+

Yes. We offer length modification for all standard straight core pin series. Specify your required overall length when ordering.