Straight One-Step Center Pin Sets
Matched sets containing a straight ejector sleeve and a stationary center pin. Factory-fit clearance ensures maximum concentricity and eliminates core binding.
Products in This Category
SKH51 Steel Gas Release Straight Ejector Core Pins Flat-Sided
Flat-sided positioning with venting slots.
SKD61 Steel Straight Ejector Sleeves & One-Step Center Pin Sets
Pre-matched concentric set.
SKD61 Steel Straight Ejector Sleeves & One-Step Center Pin Sets - Nitrided
Nitrided pre-matched assembly.
Selection Matrix: Straight Ejector Sets
Choose the right straight set variation based on your venting and tolerance requirements:
| Series Code | Sleeve Steel | Pin Type | Venting Feature |
|---|---|---|---|
| 110200024070 | SKD61 (Nitrided) | Standard Cylindrical | Standard parting line venting (clearance fit) |
| 110200024160 | SKD61 (Nitrided H7) | Standard Cylindrical | Tight flash control (reduced clearance guide) |
| 110200023910 | SKH51 (HSS) | Gas Release flat-sided | Flat venting micro-slots along core pin |
Decision rule: Pre-assembled straight sets are recommended for all production molds where clearance consistency is critical. For the ROI comparison, see our Pre-Assembled vs. Separate Sets guide.
Cost-Benefit Analysis: Custom Sourcing vs. Matched Sets
Below is the average cost breakdown based on labor hours and tooling rejects over a standard mold build:
Selection tip: Matched sets cost 50-100% more per unit, but total cost of ownership is typically 40% lower due to eliminated clearance verification and fewer seizure events. For clearance fundamentals, see our Clearance Handbook.
Application Scenarios: When to Use These Sets
Examples of molding engineering requirements that demand pre-aligned sets:
Thin-Walled Packaging
High-speed molds with cycling rates over 150 shots/min will fail if sleeves run out of concentricity.
Why it fits: Pre-assembled sets are concentric within 0.01mm, eliminating uneven friction and high-speed wear.
Deep Boss Burning
Deep circular screw bosses act as pockets trapping gas during filling, causing soot and burn marks.
Why it fits: The Gas Release set features flat venting micro-slots along the core pin to safely exit trapped air.
About Straight One-Step Center Pin Sets
Straight one-step center pin sets combine a precision straight sleeve and core pin in a single matched shipment. Concentricity limits are factory-controlled to prevent binding.
Frequently Asked Questions
What is the concentricity tolerance for straight one-step center pin sets?+
Can straight one-step sets prevent core deflection during high-pressure injection?+
How do straight one-step sets improve venting in mold cavities?+
Engineering Resources
Need a Custom Quote?
Specify your sleeve-pin pairing dimensions and material. Pre-assembled sets ship with factory-verified concentricity. Custom clearances available for special resin applications.