Locating Rings
Countersink, counterbore, and through-hole locating rings in JIS and non-JIS standards with 2-bolt or 4-bolt mounting. Includes reversible, thin-wall, low-profile, and adapter ring options.
Products — 10 Variants
Locating Rings - JIS, Countersink, 2-Bolt Holes
Locating Rings - JIS, Countersink, 2-Bolt Holes
Locating Rings - Counterbore, 4-Bolt Holes Low Profile Option
Locating Rings - Counterbore, 4-Bolt Holes Low Profile Option
Locating Rings - Counterbore, 2-Bolt Holes
Locating Rings - Counterbore, 2-Bolt Holes
Locating Rings - Through Hole, 2-Bolt or 4-Bolt Holes
Locating Rings - Through Hole, 2-Bolt or 4-Bolt Holes
Locating Rings - Reversible, 4-Bolt Holes
Locating Rings - Reversible, 4-Bolt Holes
Adapter Rings for Locating Rings
Adapter Rings for Locating Rings
Locating Rings - Thin Wall, 2-Bolt Holes
Locating Rings - Thin Wall, 2-Bolt Holes
Locating Rings - Through Hole, 2-Bolt Holes
Locating Rings - Through Hole, 2-Bolt Holes
Locating Rings - Countersink, 2-Bolt Holes, Runner Lock Pin Presser
Locating Rings - Countersink, 2-Bolt Holes, Runner Lock Pin Presser
Locating Rings - Counterbore, 4-Bolt Holes
Locating Rings - Counterbore, 4-Bolt Holes
Compare Locating Ring Types
Locating rings differ by mounting style, bolt count, and special features:
| Feature | Countersink (Standard) | Counterbore | Through-Hole | Reversible |
|---|---|---|---|---|
| Bolt Recess | Angled countersink holes | Stepped counterbore holes | Through-holes (no recess) | Either side up |
| Profile Height | Flush with mold surface | Slightly raised | Varies | Flush |
| Bolt Retention | Standard | Stronger | Through-bolt | 4-bolt |
| Bolt Count | 2-bolt or 4-bolt | 2-bolt | 2-bolt or 4-bolt | 4-bolt only |
| Best For | Most standard molds | When stronger bolt retention needed | Large molds, special mounting | Molds running on multiple machines |
Type selection: For detailed comparison, see our Locating Ring Type Selection Guide.
Step-by-Step Selection Guide
Three decisions determine your locating ring:
Machine sizing: For a machine-by-machine reference, see our Locating Ring Sizing Guide.
Pairing with Sprue Bushings
Locating rings and sprue bushings are always paired. Key compatibility factors:
- Center bore diameter — Must accommodate the sprue bushing shaft (D dimension) with proper fit.
- Mounting type match — Bolt-fixing sprue bushings need bolt-stopper locating rings. Shoulder bushings use standard rings.
- Flange thickness coordination — The locating ring counterbore depth + sprue bushing flange thickness must equal the mold plate pocket depth.
About Locating Rings
Locating rings center the mold on the injection machine's fixed platen, ensuring the machine nozzle aligns precisely with the sprue bushing opening. Even 0.5 mm misalignment causes resin leakage, uneven filling, and accelerated sprue bushing wear. MISUMI locating rings are precision-ground to match standard machine platen hole sizes.
Application Scenarios
Select based on your machine and mold configuration:
Standard Horizontal Machine
Standard horizontal injection molding machine with standard platen hole.
Countersink 2-bolt locating ring in the standard diameter for your machine. Simple, reliable, cost-effective.
Vertical Injection Machine
Vertical machines where gravity and clamping forces create additional lateral stress on the locating ring.
4-bolt mounting prevents rotational shift under gravity. Heavier molds benefit from the additional mounting security.
Multi-Machine Production (Different Platen Sizes)
The same mold needs to run on different injection machines with slightly different platen hole sizes.
Reversible locating rings present two different profiles. Flip the ring to match the machine. Or use adapter rings to convert between sizes without changing the locating ring.
Frequently Asked Questions
What is the standard locating ring diameter for my injection molding machine?+
Countersink vs counterbore locating rings — what is the difference?+
When do I need a 4-bolt locating ring instead of 2-bolt?+
What is an adapter ring for locating rings and when do I need one?+
Can reversible locating rings be used on any injection molding machine?+
Engineering Resources
Countersink vs. Counterbore vs. Through-Hole Locating Rings
Compare mounting styles and select the right type.
How to Pair Locating Rings with Sprue Bushings
Size compatibility chart for locating ring and sprue bushing combinations.
Locating Ring Sizing Guide: Matching Rings to Machines
Machine-by-machine sizing reference.
Need a Custom Quote?
Specify your injection machine model (or platen hole diameter), sprue bushing shaft diameter, mounting type (2-bolt/4-bolt), and any special requirements (reversible, thin-wall, adapter ring).