Straight Core Pins with Tip Processing
Precision-ground or lapped tips for superior surface finish at the cavity contact point. Available with optional TiCN coating.
Products in This Category
Precision Straight Core Pins with Tip Processed | OEM Available
Precision Straight Core Pins with Tip Processed in M2 Steel (SKH51) with Extra Precision M2 for plastic injection moldin
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 Straight Core Pins with Tip Processed | OEM Available
Straight Core Pins with Tip Processed in SKD61/SKH51 Steel with Tip Processed. Engineered for plastic injection molding
JIS Standard Straight Core Pins with Tip Processed | OEM Available
Straight Core Pins with Tip Processed in SKH51/SKD61 Steel with Tip Processed. Engineered for plastic injection molding
JIS Standard Straight Core Pins with Tip Processed | OEM Available
Straight Core Pins with Tip Processed in H13 Steel with JIS Head H13. Engineered for plastic injection molding with cust
JIS Standard Straight Core Pins with Tip Processed | OEM Available
Straight Core Pins with Tip Processed in SKH51/SKD61 Steel with Configurable Head. Engineered for plastic injection mold
JIS Standard Straight Core Pins with Tip Processed | OEM Available
Straight Core Pins with Tip Processed in M2/H13 Steel with Tip Processed. Engineered for plastic injection molding with
Tip Processing Options
Choose the tip finish level based on your part's surface quality requirements:
| Variant | Description | Best For | Recommendation |
|---|---|---|---|
| Standard Ground | Fine-ground flat end face, Ra 0.2–0.4 μm | Visible internal features (button recesses, indicator wells) | Default for visible features |
| Lapped / Mirror | Mirror-polished tip face, Ra < 0.1 μm | Optical-grade surface requirements (light pipes, lens housings) | Premium finish applications |
| TiCN Coated | Titanium carbonitride coating on tip, HV 3000+ | 500K+ shot molds where tip wear degrades surface quality | Maximum tip lifespan |
Do You Need Tip Processing?
Tip-processed pins cost more than standard no-tip pins. Confirm the investment is justified:
✅ You're in the right place if:
- The molded feature is visible to the end user (cosmetic surface, indicator window, display area)
- Surface finish requirement is Ra ≤ 0.4 μm — standard as-machined tip won't meet spec
- You need consistent surface quality across 500K+ shots (TiCN coating scenario)
🔄 Consider switching to:
- Feature is not visible after assembly? → Standard No-Tip Core Pins (lower cost)
- Need a date code or cavity number instead of surface finish? → Engraved Core Pins
- Primary issue is gas trapping, not surface quality? → Gas Release Core Pins
About Tip-Processed Core Pins
Tip processing refers to additional machining applied to the working end of the core pin after initial grinding. Operations include fine grinding, lapping, and in some series, TiCN (Titanium Carbonitride) coating to extend tip wear life.
The primary benefit is a smoother cavity surface, which translates directly to better surface finish on the molded part's internal features. This matters when the hole or recess is visible to the end user — for example, button recesses on consumer electronics housings or indicator light wells on automotive dashboards.
A secondary benefit is reduced ejection force. A smoother tip surface decreases friction between the solidified plastic and the pin during mold opening, reducing the risk of surface drag marks and pin-related cosmetic defects.
Tip processing does not alter shaft diameter, overall length, or head dimensions. All shaft tolerances remain per the original JIS specification. Extra-precision grades are available independently of tip processing.
Application Scenarios
See how this product type solves real engineering challenges across different industries and applications:
Optical Lens Housing Cavities
Pain point: Optical products require the internal bore to have a mirror-grade surface (Ra ≤ 0.2 µm) — standard ground tips leave visible machining marks that scatter light.
Why it fits: Lapped tip processing achieves Ra 0.1–0.2 µm directly on the core pin, eliminating the need for secondary cavity polishing. This is critical for lens barrels and light-guide channels.
Consumer Electronics Display Bezels
Pain point: Display bezel molds form visible through-holes for cameras and sensors — any gate vestige or surface imperfection on the hole wall is visible to the end user.
Why it fits: Tip-processed core pins with fine-ground finish ensure clean hole walls with no visible machining lines. TiCN coating extends tip life beyond 500K shots for high-volume production.
Precision Gear & Bearing Bore Molds
Pain point: Internal bearing bores in molded gears require tight surface finish to avoid premature bearing wear — but the bore is not cosmetically visible.
Why it fits: Tip processing delivers controlled Ra < 0.4 µm for functional surfaces. Combined with extra-precision shaft tolerance, it ensures concentricity critical for rotating parts.
Related Categories
Frequently Asked Questions
What tip processing options are available?+
Does tip processing affect dimensional tolerance?+
When should I choose TiCN-coated tips?+
Engineering Resources
Case Studies
Need a Custom Quote?
Send your specifications — material, dimensions, quantity — and receive a quote. MOQ: 1 piece. Custom dimensions available.