Gas Release One-Step Core Pins
One-step geometry with gas venting. Solve diameter transition and gas trapping in one pin.
Products in This Category
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.
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.
JIS Standard Gas Release Straight Core Pins | OEM Available
Gas Release Straight Core Pins in SKD61/SKH51 Steel with Core Pin. Engineered for plastic injection molding with custom
JIS Standard Gas Release Straight Core Pins | OEM Available
Gas Release Straight Core Pins in SKD61/SKH51 Steel with Core Pin. Engineered for plastic injection molding with custom
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.
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.
Vent Type for Stepped Pins
Gas release stepped pins address gas trapping at the diameter transition. Vent options:
| Variant | Description | Best For | Recommendation |
|---|---|---|---|
| Flat-Sided | Ground flat along stepped shaft — simpler geometry | Moderate gas trapping, the step transition itself provides some channeling | Usually sufficient for stepped cavities |
| SVC (Semi-circular) | Half-moon vent groove machined into the stepped shaft | Exceptionally deep stepped cavities where flat-sided capacity is insufficient | Deep blind features only |
Do You Need Gas Release on Stepped Pins?
Gas release adds cost to an already complex stepped pin. Confirm the gas trapping occurs at the step transition:
✅ You're in the right place if:
- Burn marks appear at or near the diameter transition on the molded part
- Standard stepped pins (without venting) produce persistent gas defects
- The stepped cavity is a deep blind feature with no alternative vent path
🔄 Consider switching to:
- Gas trapping in a straight (non-stepped) cavity? → Straight Gas Release Pins
- No gas issue — just need a standard stepped pin? → One-Step or Two-Step Pins
- Want faster pin replacement with gas release? → Taperless Gas Release Pins
About Gas Release Stepped Pins
Deep stepped features are particularly prone to gas trapping. The diameter transition creates a pocket where air accumulates past the step shoulder — and in blind cavities, this air has nowhere to go.
Gas release one-step pins incorporate venting geometry (flat-sided or SVC channels) into the shaft of a stepped pin. This eliminates trapped-air defects without requiring separate vent inserts or parting line modifications.
Flat-sided venting is usually sufficient for stepped cavities since the step transition itself provides some gas channeling. SVC is recommended for exceptionally deep cavities where the flat-sided capacity is insufficient.
Application Scenarios
See how this product type solves real engineering challenges across different industries and applications:
Deep Stepped Cavities with Gas Trapping
Pain point: Stepped core pins in deep cavities face compounded gas trapping — air gets trapped at the smaller step during initial filling and cannot escape past the step transition.
Why it fits: Gas release grooves run the full pin length including across the step transition, providing a continuous vent path. This is critical for stepped bores deeper than 4× the major diameter.
High-Temperature Stepped Bore Molding
Pain point: Engineering resins processed above 280°C in deep stepped cavities generate volatile gases that accumulate at the step transition — causing both burns and dimensional distortion.
Why it fits: Gas venting at the step transition prevents gas compression artifacts. SKD61 material maintains hardness at elevated mold temperatures, resisting thermal erosion at the step edge.
Related Categories
Frequently Asked Questions
Gas release with two-step?+
Flat-sided or SVC for stepped?+
Same step tolerances as non-vented?+
Engineering Resources
Case Studies
Need a Custom Quote?
Send your specifications — material, dimensions, quantity — and receive a quote. MOQ: 1 piece. Custom dimensions available.