Leader Bushings for Medium-Large Mold
Straight-type leader bushings with oil groove lubrication channels for large mold guiding systems. Extends maintenance intervals to 50,000+ shots through controlled lubrication distribution.
Products in This Category
Leader Bushings — Straight, Oil Grooves
Helical oil grooves for full-length lubrication. Matched to large mold leader pins.
Pairing: Bushing + Pin + Stopper Plate
| Interface | Tolerance | Purpose |
|---|---|---|
| Bushing bore ↔ Leader pin | H7/f7 (0.010–0.020 mm clearance) | Controlled sliding fit for alignment |
| Bushing OD ↔ Plate bore | H7/r6 (press-fit) | Secure retention in plate |
| Stopper plate ↔ Bushing flange | Bolted contact | Prevents axial migration |
Decision rule: Leader bushings must match the leader pin outer diameter with 0.005–0.015 mm sliding clearance. Oil groove type determines re-lubrication interval. For detailed guidance, see our What Press-Fit Tolerances Do Leader Bushings Need in Large Molds?.
Application
High-Cycle Guided Molds
Molds running >15 second cycles where leader pin-to-bushing wear directly impacts part dimensional accuracy.
Spiral oil groove bushings extend re-lubrication intervals by 2-3× compared to straight grooves, reducing maintenance downtime while maintaining 0.005-0.015 mm sliding clearance precision.
Recommended: Spiral Oil Groove bushings for cycle times <15 seconds
Vertical/Inverted Mold Mounting
Molds mounted vertically or inverted where gravity pulls lubricant away from the bushing-to-pin contact surface.
Cross-hatched oil groove pattern maximizes oil retention in any mounting orientation, preventing dry-running wear that causes progressive bore enlargement and loss of alignment precision.
Recommended: Cross-Hatched Oil Groove bushings for non-horizontal mounting
Decision rule: Oil groove type determines re-lubrication interval and maximum cycle speed. Choose spiral grooves for high-cycle horizontal molds, cross-hatched for vertical or inverted mounting. For detailed guidance, see our How Oil Groove Patterns Affect Leader Bushing Lubrication Life.