Straight Core Pins with Engraving
Tip-face characters for molding date codes, lot numbers, and recycling symbols directly onto the plastic part.
Products in This Category
JIS Standard M2 Steel Straight Core Pins - Core Pin | OEM Available
Straight Core Pins in M2 Steel with Core Pin. Engineered for plastic injection molding with custom options. Contact us.
JIS Standard M2 Steel Straight Core Pins - Core Pin | OEM Available
Straight Core Pins in M2 Steel with Core Pin. Engineered for plastic injection molding with custom options. Contact us.
JIS Standard M2 Steel Straight Core Pins - Core Pin | OEM Available
Straight Core Pins in M2 Steel with Core Pin. Engineered for plastic injection molding with custom options. Contact us.
Engraving Type Selection
Two engraving methods produce opposite marking effects on the molded part:
| Variant | Description | Best For | Recommendation |
|---|---|---|---|
| Concave Engraving | Characters cut into the pin tip face | Produces raised characters on the part — more visible, easier to read | Most common for date codes & cavity numbers |
| Convex Engraving | Characters raised on the pin tip face | Produces recessed characters — flush surface, less snag risk | Preferred for recycling symbols |
Is Core Pin Engraving the Right Approach?
Engraving on the core pin creates a marking on the molded part. But it's not the only way to mark parts:
✅ You're in the right place if:
- You need a date code, cavity number, or recycling symbol molded directly onto the part
- The marking location corresponds to an internal feature formed by a core pin
- Marking must be permanent and molded-in — not post-process pad printing or labeling
🔄 Consider switching to:
- Marking location is on the cavity wall, not a core pin feature? → Engrave the cavity insert instead
- Just need good surface finish without marking? → Tip-Processed Core Pins
- Feature also has gas trapping issues? → Gas Release Core Pins (marking can be added to mold cavity)
About Engraved Core Pins
Regulatory requirements often mandate date codes, cavity identification numbers, or recycling symbols on every molded part. Engraved core pins eliminate post-mold laser engraving or pad printing entirely — the characters are machined into the pin tip so every part emerges with the marking already formed.
When the date changes, only the pin is swapped — a 2-minute operation that does not require mold disassembly. Many customers maintain a rotating set of engraved pins for weekly or monthly date changeover.
Two engraving types are available: Concave engraving cuts into the pin tip, producing raised characters on the molded part. Convex engraving creates raised characters on the pin, producing recessed characters on the part. The choice depends on whether the marking should be proud of or flush with the part surface.
Application Scenarios
See how this product type solves real engineering challenges across different industries and applications:
Multi-Cavity Mold Identification
Pain point: In multi-cavity molds (16-64 cavities), defective parts must be traced back to the specific cavity that produced them — but individual cavity marking adds tooling cost.
Why it fits: Engraved core pins stamp a cavity number directly onto each molded part at zero incremental cycle time. This eliminates the need for separate marking inserts or laser marking post-mold.
Date Code & Lot Tracking Compliance
Pain point: Automotive and medical regulations (IATF 16949, FDA 21 CFR 820) require date codes on molded parts for traceability — changing date inserts adds downtime.
Why it fits: Core pins with rotatable date code engraving allow date changes without removing the pin from the mold. This minimizes changeover time between production lots.
Brand Logo on Internal Features
Pain point: OEM customers require their brand logo or part number molded into an internal feature (e.g., inside a battery compartment lid) — but the feature is formed by a core pin.
Why it fits: Custom engraving on the pin tip transfers the logo or text directly onto the molded surface. Mirror-quality engraving ensures readable text at sizes as small as 1.5 mm height.
Related Categories
Frequently Asked Questions
Can I specify custom characters?+
Concave vs convex engraving?+
How often do engraved pins need replacement?+
Engineering Resources
Case Studies
Need a Custom Quote?
Send your specifications — material, dimensions, quantity — and receive a quote. MOQ: 1 piece. Custom dimensions available.