Spacer Rings
Precision-ground rings that maintain exact spacing between ejector plates or between the ejector plate assembly and the mold base.
Spacer Rings Products
Spacer Rings — Type A
S45C or SUJ2 | Precision ground height | ±0.01 mm
Spacer Rings — Type B
S45C or SUJ2 | Precision ground height | ±0.01 mm
Spacer Rings — Type C
S45C or SUJ2 | Precision ground height | ±0.01 mm
Spacer Rings — Type D
S45C or SUJ2 | Precision ground height | ±0.01 mm
Spacer Rings — Type E
S45C or SUJ2 | Precision ground height | ±0.01 mm
Spacer Rings — Type F
S45C or SUJ2 | Precision ground height | ±0.01 mm
Spacer Ring Height Selection
Spacer ring height must exactly match the design gap between ejector plates or between the ejector assembly and the mold base. Incorrect height causes either binding (too tall) or excessive play (too short).
| Gap Dimension | Spacer Height | Tolerance |
|---|---|---|
| Ejector Plate Gap | Height = Design gap | ±0.01 mm |
| Plate-to-Base Gap | Height = Design gap − pin head height | ±0.01 mm |
Selection guide: For a step-by-step approach to this decision, see our guide How to Select the Correct Spacer Ring Height for Your Mold.
About Spacer Rings
Spacer rings maintain precise, repeatable distances within the ejector assembly. They are ground to ±0.01 mm height tolerance from S45C or SUJ2 steel. Proper spacing ensures that the ejector plate travels smoothly without binding and that ejector pins are correctly positioned at the home position.
Application Scenarios
Multi-Plate Ejector Assemblies
Two-plate ejector assemblies (retainer + backing) need precise spacing to hold ejector pin heads without play.
Why it fits: Precision-ground spacer rings ensure zero gap variation across the plate surface, eliminating pin rattle.
Frequently Asked Questions
How do I select the correct spacer ring height?+
What material and hardness are spacer rings made from?+
Can spacer rings be used in combination with support pillars?+
Engineering Resources
Need Custom Spacer Rings?
Precision spacer rings manufactured to JIS and DIN standards. Custom dimensions available. MOQ 1 piece.