Round Core Pins for Boss

Name: Round Core Pins for Boss | Core Pins | Axiom Molds
Brand: Axiom Molds
Availability: InStock
Rating: 4.9 (128 reviews)

Optimized proportions for boss pillar forming. Gas release variants available for deep boss features.

Products in This Category

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Straight Core Pins in M2 Steel with Core Pin. Engineered for plastic injection molding with custom options. Contact us.

JIS Standard M2 Steel Gas Release Straight Core Pins | OEM Available

Gas Release Straight Core Pins in M2 Steel with Core Pin. Engineered for plastic injection molding with custom options.

Boss Pin Selection Guide

Round core pins for boss forming are available with or without gas release. Decision depends on boss depth:

Variant	Description	Best For	Recommendation
Standard (No Vent)	Solid cylindrical pin optimized for boss diameter and wall thickness ratios	Shallow bosses (depth < 3× diameter), adequate natural venting	Default for most boss features
Gas Release Variant	Same boss-optimized proportions with integrated venting channel	Deep bosses (>3× diameter) where air traps at the bottom of the boss cavity	Required for deep boss features

Decision rule: If your boss depth exceeds 3× the pin diameter, gas trapping is almost certain — specify the gas release variant. For shallower bosses, standard pins vent adequately through the parting line. For material grade, see our material comparison guide.

Is a Boss-Specific Pin Necessary?

Boss pins are optimized for forming screw bosses, standoffs, and support pillars. Confirm your feature type:

✅ You're in the right place if:

The feature is a cylindrical boss or standoff pillar on the molded part
Wall thickness around the boss is critical for screw pull-out strength
Boss diameter-to-wall ratio requires specific pin proportions to prevent sink marks

🔄 Consider switching to:

Forming a simple through-hole, not a boss? → Straight Core Pins
Need custom tip geometry on the pin? → Round Shank + Custom Tip Pins
Pin diameter exceeds 16 mm? → Large-Diameter Core Pins

About Round Core Pins for Boss Forming

Boss pillars — the cylindrical standoffs used for screw fastening and structural support in molded parts — present specific molding challenges. Wall thickness must be controlled to avoid sink marks on the outer surface while maintaining sufficient strength for the fastening load.

These pins are dimensioned to match standard boss design guidelines, with shaft diameters optimized relative to common boss outer diameters in consumer electronics, automotive, and industrial housing applications.

Gas release variants are critical for boss pillars because they frequently exceed a 3:1 depth-to-diameter ratio and are blind features — both conditions that maximize gas trapping potential. Venting through the pin shaft eliminates this issue without requiring parting line modifications.

Application Scenarios

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

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Precision Screw Boss Formation

Pain point: Screw boss holes must maintain tight diameter tolerance to ensure proper self-tapping screw engagement — but the boss is often deep relative to its diameter, making standard core pin guidance difficult.

Why it fits: Round-for-boss core pins are specifically dimensioned for boss hole formation with optimized length-to-diameter ratios. The guided fit ensures concentricity even in deep boss geometries.

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Thin-Wall Consumer Product Bosses

Pain point: Modern consumer products trend toward thinner walls — making boss formation more challenging as the core pin must maintain position in a thin-wall cavity without deflection.

Why it fits: Precision-ground shaft with tight tolerance prevents pin deflection in thin-wall sections. Available in multiple diameter increments to match exact boss ID requirements.