Steel-base -20 architecture
For parts within the 3/8-2 in diameter and 6 in length envelope when the standard steel-base LG architecture and adjustable measurement-head positioning fit the inspection method.
LG Series · -20 Platform
Lazer Gage · Steel Base
LG-20 Lazer Gage
Precision measurement architecture for cylindrical components from 3/8-2 in (10-50 mm) in diameter and up to 6 in (152 mm) long.
Part Diameter
3/8-2 in
10-50 mm
Part Length
Up to 6 in
152 mm
Base
Steel
LG architecture
Catalog Accuracy
≤2 µm
Qualified catalog statement
Direct Product Definition
A steel-base Lazer Gage on the intermediate -20 platform.
The Universal Punch LG-20 supports a cylindrical component on selected roller-contact surfaces while an adjustable Lazer measurement head is positioned at the required inspection location.
As the component rotates, the configured system can observe dimensional variation at the selected feature. The meaning of the reading depends on the support datum, measurement location, sensor configuration, tolerance and documented inspection method.
LG-20 provides the precision support and measurement architecture. It does not automatically establish the correct datum or prove every GD&T concentricity requirement without an application-specific inspection method.
Application Selection
Is LG-20 right for the application?
Select the model from component capacity, support geometry, measurement method and rotation requirements—not diameter alone.
Smaller diameter class
For the same steel-base LG family architecture with a smaller nominal diameter range of 1/8-1 in / 3-25 mm.
Dedicated powered rotation
For the same published -20 capacity when the application requires the dedicated motorized LGM counterpart.
Principal LG/LGM distinction: LG-20 is the steel-base LG model. LGM-20 is its motorized counterpart. Motorized equipment visible in family photography must not be presented as standard LG-20 equipment.
Published Technical Data
LG-20 specifications
| Specification | LG-20 | Technical note |
|---|---|---|
| Model | LG-20 | Universal Punch LG Series |
| Product name | Lazer Gage | Manufacturer spelling retained |
| Base construction | Steel base | Defining LG architecture |
| Part diameter | 3/8-2 in / 10-50 mm | Published -20 capacity |
| Maximum part length | 6 in / 152 mm | Published maximum |
| Published shipping weight | 4.4 lb / 2.0 kg | Published for the LG-20/LGM-20 capacity listing |
| Published accuracy wording | Catalog identifies ≤2 µm | Configuration and application conditions still matter |
| Rotation family | LG non-motorized family | LGM-20 is the dedicated motorized counterpart |
| Final configuration | Application dependent | Confirm sensor, support, rotation and documentation |
Dimension guardrail: Unsupported overall length, width and height dimensions are intentionally not published. The operating envelope can change with measurement-head selection, support spacing, workpiece geometry, electronics, cable routing, rotation equipment and accessories.
Steel Base and Roller Support
Stable support begins with the actual component geometry.
The steel base provides the structural platform for the support and measurement assemblies. The component must rest on suitable cylindrical lands that establish the intended rotational reference.
Review usable journal diameter, support-land width, support spacing, shoulders, flanges, grooves, threads, splines, diameter transitions, component stiffness, unsupported span and proximity to the measured feature.
Being within the LG-20 two-inch capacity does not by itself confirm that a component is suitable. The usable support geometry must be reviewed from the drawing or sample part.
Lazer Measurement Architecture
Position the measurement system around the inspection requirement.
Measurement-head selection and positioning should be based on the feature being inspected, nominal diameter, expected variation, required resolution, working distance, available clearance, surface finish and reflectivity, measurement direction, rotation method and required output.
One photographed sensor, electronic package or cable arrangement should not be assumed to be included with every LG-20.
Configuration language: Measurement-head, electronics and output requirements are configured during application review. Submit the component drawing, tolerance and desired inspection method for selection assistance.
Inspection Process
How LG-20 is configured and used
The displayed variation becomes meaningful only after the support datum, measurement location and inspection method are defined.
Define the characteristic
Review the drawing, datum structure, feature and inspection tolerance.
Confirm capacity
Verify diameter, overall length and usable cylindrical support lands.
Configure support
Establish the rotational reference and restraint arrangement.
Position the head
Set the measurement location, direction, working distance and clearance.
Confirm the system
Verify range, resolution, surface suitability, output and rotation method.
Rotate and interpret
Evaluate the recorded variation according to the approved inspection procedure.
LG-20 may support runout or concentricity-related inspection, but a displayed reading is not automatically equivalent to true GD&T concentricity.
Accuracy and Traceability
Catalog identifies ≤2 µm accuracy.
This qualified manufacturer statement remains visible without converting it into an unsupported universal guarantee or an automatic Precision Gold classification.
≤2 µmpublished statement
Confirm the complete LG-20 configuration and the required performance documentation during quotation.
Not automatically Precision Gold
The catalog accuracy statement should not be rewritten as an automatic Precision Gold designation or an unconditional system guarantee.
NIST-traceable support
Universal Punch describes its calibration support as NIST traceable. Specify the required certificate, reporting and traceability documentation when requesting the quotation.
Accuracy clarification: Application performance can depend on component support, measurement range, sensor configuration, surface condition, environmental stability, cleanliness, rotation quality, calibration status and the inspection procedure.
LG and LGM Family Comparison
Select capacity first, then choose the rotation architecture.
| Model | Part Diameter | Maximum Length | Base / Rotation Architecture |
|---|---|---|---|
| LG-10 | 1/8-1 in / 3-25 mm | 6 in / 152 mm | Steel-base LG |
| LG-20 | 3/8-2 in / 10-50 mm | 6 in / 152 mm | Steel-base LG |
| LGM-10 | 1/8-1 in / 3-25 mm | 6 in / 152 mm | Motorized LG counterpart |
| LGM-20 | 3/8-2 in / 10-50 mm | 6 in / 152 mm | Motorized LG counterpart |
LG-20 and LGM-20 share the same published component-capacity class. The defining selection question is whether the application requires the standard steel-base LG architecture or the dedicated motorized LGM configuration.
Manufacturer Configuration
Configure the complete LG-20 around the inspection requirement.
Confirm capacity
Verify the complete diameter range, overall length and support-journal geometry.
Define the datum
Identify the surfaces that establish the component's rotational reference.
Select support geometry
Configure the rollers and restraint arrangement around usable support lands.
Define the measurement
Specify the feature, tolerance, direction, expected range and required resolution.
Select rotation
Confirm whether the standard LG architecture or motorized LGM-20 counterpart fits the process.
Specify documentation
Define calibration, traceability, reporting and certification requirements.
Technical RFQ Checklist
Let Universal Punch review the complete LG-20 application.
The drawing, support geometry, measurement requirement and desired output allow the Lazer Gage to be evaluated as a complete inspection system.
- Component drawing
- Diameter range and overall length
- Support-journal diameters and widths
- Support spacing
- Shoulders, flanges and grooves
- Threads, splines and transitions
- Feature and datum to be evaluated
- Tolerance and expected range
- Required resolution
- Material, finish and reflectivity
- Rotation and output requirements
- Calibration-documentation requirements
Technical FAQ
LG-20 questions and direct answers
What is the Universal Punch LG-20?
The LG-20 is a steel-base Lazer Gage for cylindrical components from 3/8 to 2 inches, or 10 to 50 millimeters, in diameter and up to 6 inches, or 152 millimeters, long. Its support and measurement-head configuration is selected for the application.
What does LG-20 mean?
LG identifies Universal Punch's steel-base Lazer Gage family. The -20 suffix identifies the intermediate component-capacity platform for nominal diameters from 3/8 to 2 inches, or 10 to 50 millimeters.
Why is Lazer Gage spelled with a z?
Lazer Gage is the product-family spelling used in Universal Punch documentation. The page preserves that manufacturer naming while also describing the product as a concentricity gage for search and selection clarity.
What size parts can the LG-20 support?
The published LG-20 capacity is 3/8 to 2 inches, or 10 to 50 millimeters, in diameter and up to 6 inches, or 152 millimeters, long. Support-land geometry and access must also be reviewed before the application is approved.
What does the catalog's 2 micrometer accuracy statement mean?
The manufacturer catalog identifies accuracy of 2 micrometers or less for LG-20. Final application performance still depends on the selected measurement system, component support, rotation, surface condition, environment, calibration status and inspection procedure.
Is LG-20 automatically a Precision Gold gage?
No. The LG-20 page preserves the catalog's qualified accuracy statement and does not automatically relabel LG-20 as Precision Gold. Confirm the required accuracy classification and documentation with Universal Punch during quotation.
What is the difference between LG-20 and LGM-20?
LG-20 is the steel-base LG model. LGM-20 is the dedicated motorized counterpart for the same published component-capacity class. Powered equipment shown in family photography should not be interpreted as standard LG-20 equipment.
What is the difference between LG-20 and LG-10?
Both use the steel-base LG architecture. LG-10 is the smaller model for nominal part diameters from 1/8 to 1 inch, while LG-20 supports nominal diameters from 3/8 to 2 inches. Both publish a maximum part length of 6 inches.
Is LG-20 motorized?
LG-20 belongs to the non-motorized steel-base LG family. When dedicated powered rotation is required, evaluate the LGM-20 motorized counterpart. Final rotation equipment should be confirmed during application review.
Does LG-20 use a steel base?
Yes. Universal Punch identifies LG-20 as the Lazer Gage with a steel-base architecture. The base supports the selected roller and measurement assemblies.
What does the LG-20 measurement head inspect?
The feature and measurement meaning are defined by the component drawing, datum structure, support locations, head orientation, sensor range, surface condition, tolerance and approved inspection method. One photographed sensor package should not be assumed to be standard for every LG-20.
Can LG-20 be used for runout inspection?
LG-20 may support runout or concentricity-related inspection when its supports, rotational datum, measurement location and procedure are configured for that characteristic. Submit the drawing and tolerance for application review.
Does an LG-20 reading automatically prove GD&T concentricity?
No. A displayed variation is meaningful only in relation to the selected support datum, measurement location and inspection method. The system does not automatically prove every GD&T concentricity requirement without an application-specific method.
How are LG-20 component supports selected?
Support selection considers usable journal diameters and widths, support spacing, shoulders, flanges, grooves, threads, splines, diameter transitions, component stiffness, unsupported span and proximity to the measured feature.
Is calibration and traceability documentation available?
Universal Punch describes its calibration support as NIST traceable. Specify the required certificate, reporting and traceability documentation when requesting the quotation because documentation requirements can vary by application.
What should I send for an LG-20 quote?
Send the component drawing, diameter range, overall length, support-journal geometry, feature and datum to be evaluated, tolerance, expected measurement range, required resolution, material and surface information, rotation preference, output requirements and calibration-documentation requirements.
Application Review
Configure LG-20 from the component—not assumptions.
Send Universal Punch the drawing, inspection characteristic, support surfaces, tolerance, desired rotation method and documentation requirements. The team can review whether LG-20 is the correct platform and define the remaining system details.