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
JIS Standard LRJS Locating Rings, Countersink, 2-Bolt Holes
JIS Standard LRJS Locating Rings with countersink design and 2-bolt holes provide stable alignment for locating syste...
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LRSS Locating Rings Counterbore 4-Bolt Holes
LRSS locating rings counterbore with 4-bolt holes for shoulder-type sprue compatibility. Low profile option for accur...
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LRBD Locating Rings - Counterbore, 2-Bolt Holes
LRBD Locating Rings - Counterbore, 2-Bolt Holes provide secure alignment with bolt stopper type and standard locating...
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Locating Rings Through Hole Bolt Stopper
Locating Rings Through Hole Bolt Stopper for 2-bolt or 4-bolt mounting. Reliable alignment for die sets with standard...
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JIS Standard LRBW Reversible Locating Rings for 4-Bolt Holes
LRBW reversible locating rings with 4-bolt holes support secure sprue alignment using bolt stopper type compatibility...
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LAR Type Adapter Rings for Locating Rings
LAR Type Adapter Rings for Locating Rings for locating ring assemblies. Compatible with both bolt type and shoulder t...
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LRK Standard Locating Rings - Large Diameter Type, 2-Bolt...
LRK Standard Locating Rings for thin-wall mold layouts with large diameter and 2-bolt holes. Bolt stopper type fit fo...
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Locating Rings Through Hole 2-Bolt Holes
Locating Rings Through Hole 2-Bolt Holes for precise alignment. Bolt stopper type improves repeatable positioning for...
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JIS Standard LRJST Runner Lock Pin Presser Locating Rings...
Runner lock pin presser locating rings with countersink and 2-bolt holes for both bolt and shoulder sprue types. JIS ...
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JIS Standard Locating Rings - Counterbore, 4-Bolt Holes
JIS Standard Locating Rings - Counterbore, 4-Bolt Holes for shoulder-type sprues. Standard locating ring design with ...
View DetailsCompare 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).