Choose K2-20 when the part fits the -20 envelope, two indicator positions are needed, and the second measurement requires vertical access.
Universal Punch Concentricity Gaging System
K2 Series · -20
Dual Indicator · Standard + Vertical Carrier
K2-20 Dual Indicator Concentricity Gage
Two configurable measurement positions with Standard and Vertical Carrier access.
The Universal Punch K2-20 is a dual-indicator concentricity gage for cylindrical components from 3/8–2 in (10–50 mm) in diameter and up to 6 in (152 mm) long.
Its K2 architecture combines a Standard Carrier with a Vertical Carrier, creating two configurable indicator contact positions around the same supported rotating component.
Select the K2-20 when the component fits the -20 capacity class and the second measurement position requires vertical indicator access.
Technical page last updated:
September 1, 2026.
Confirm current production configuration when quoting.
K2-20 Definition
K2-20 combines Standard + Vertical Carrier access.
K2 identifies Universal Punch's dual-indicator architecture using a Standard Carrier plus Vertical Carrier.
-20 identifies the Universal Punch size class for 3/8–2 in / 10–50 mm cylindrical components.
The K2-20 is intended for inspections where two indicator positions are useful around one supported rotational setup and the second measurement location benefits from vertical access.
The Universal Punch K2-20 is a dual-indicator concentricity gage for
3/8–2 in (10–50 mm) diameter cylindrical components up to
6 in (152 mm) long, using
Standard Carrier + Vertical Carrier measurement access.
Application Decision Guide
Is K2-20 the right concentricity gage for your application?
Start with component capacity, then choose the carrier architecture from the number and direction of measurement positions required by the drawing.
Use the same -20 capacity class when the second indicator needs lateral Side Carrier access.
Choose G2-20 when one vertical-access measurement position is sufficient.
Choose KK2-20 when the application requires a third independent Side Carrier measurement position.
Dual-Indicator Architecture
Two measurement positions around one rotational setup.
The defining value of K2-20 is the combination of a Standard Carrier position and a second Vertical Carrier position around the same supported component.
Measurement Position 1
Standard Carrier
Establishes the primary configurable indicator position. Contact location, stylus direction, range and resolution should be selected from the component drawing and inspection plan.
Measurement Position 2
Vertical Carrier
Provides the vertical-access measurement position that defines the K2 family. Use it where the second inspection feature benefits from a vertical probe approach.
K2-20 does not inherently measure two predetermined characteristics.
What each indicator evaluates depends on the component drawing, support geometry,
datum relationship, contact locations and inspection procedure.
Standard Carrier
Configure the primary measurement position from the drawing.
The Standard Carrier supports the first K2-20 indicator position around the rotating component. Its final location should be determined from the actual inspection feature—not copied from a catalog photograph.
Inspection feature
Identify the diameter, journal, face, shoulder or other feature being evaluated.
Datum relationship
Define what the indicator reading represents relative to the supported rotational axis.
Probe clearance
Account for shoulders, grooves, threads, splines and adjacent geometry.
Indicator selection
Choose range, resolution, stylus and contact direction from the inspection requirement.
Configuration principle:
the indicator arrangement shown in K2-20 photography is an example.
Final Standard Carrier positioning should come from the actual component drawing and tolerance.
Vertical Carrier Architecture
Vertical Carrier access defines the K2 architecture.
The second K2-20 indicator is configured using a Vertical Carrier. This establishes a vertically oriented measurement-access position relative to the supported rotating component.
Choose K2-20 when the second indicator requires Vertical Carrier access.
Choose K1-20 when the second indicator requires lateral Side Carrier access.
K1-20 and K2-20 share the same published -20 component envelope. The critical difference is therefore second-indicator access direction, not part size alone.
Published K2-20 General Data
K2-20 specifications and capacity.
Use published capacity for initial model selection. Confirm support geometry, indicators, calibration and drive configuration from the actual application.
Part Diameter
3/8–2 in
10–50 mm
Part Length
Up to 6 in
152 mm
Carrier Architecture
Standard + Vertical
Dual indicator
Overall Length
12.5 in
318 mm
Width / Approx. Height
6.5 in / 6 in
165 mm / 152 mm
Shipping Weight
14.8 lb
6.8 kg
| Specification | K2-20 Published Data |
|---|---|
| Model | K2-20 |
| Gage Type | Dual Indicator Concentricity Gage |
| Carrier Configuration | Standard Carrier + Vertical Carrier |
| Part Diameter | 3/8–2 in / 10–50 mm |
| Maximum Part Length | 6 in / 152 mm |
| Overall Gage Length | 12.5 in / 318 mm |
| Gage Width | 6.5 in / 165 mm |
| Approximate Height | 6 in / 152 mm |
| Published Shipping Weight | 14.8 lb / 6.8 kg |
-20 Roller Selection
Stable support is the foundation of the K2-20 measurement.
Both indicators reference the same supported rotational setup, making the roller and top-contact configuration fundamental to the complete inspection.
120-20FP · Full Plain
Full plain main roller set for suitable -20 cylindrical support geometry.
120-20HP · Half Plain
Half plain support where nearby shoulders or component features require more clearance.
120-20QP · Quarter Plain
Quarter plain support geometry for narrower or more constrained cylindrical support lands.
Engineering rule:
a 2-inch maximum component diameter does not automatically determine the correct K2-20 roller set.
Select support geometry from the actual cylindrical lands available on the component.
Evaluate journal diameter, journal width, shoulders, flanges, threads, splines, grooves, diameter transitions, support spacing, unsupported span, measurement position and component stiffness.
Published -20 top roller reference:
Universal Punch documentation identifies 170-20,
approximately 3/4 × 9/32 in (19 × 7 mm),
as the standard -20 top roller.
Confirm final top-contact geometry from the actual component and current production documentation.
How K2-20 Is Configured
Confirm. Support. Position. Rotate. Interpret.
01
Confirm the -20 envelope.
Verify diameter, length and usable support surfaces against K2-20 capacity.
02
Select support geometry.
Choose stable -20 roller geometry from the actual cylindrical support lands.
03
Position the Standard Carrier indicator.
Configure the first contact point from the drawing, datum relationship and measurement objective.
04
Position the Vertical Carrier indicator.
Configure vertical access for the second inspection location.
05
Rotate the supported component.
Use controlled rotation through the required inspection cycle.
06
Interpret both indicator responses.
Use the drawing, datum structure, tolerance and inspection method to interpret each measurement.
Both K2-20 indicators reference the same supported rotational setup,
but each indicator can be configured for a different measurement feature or contact location.
Accuracy & Calibration
Published accuracy classes for the -20 platform.
K2-20 belongs to Universal Punch's -20 size class, which current documentation identifies within the applicable model classes for Standard Black and Precision Gold configurations.
Standard Black
Published system classification of better than or equal to 4 µm / 0.00016 in.
Precision Gold
Published for applicable -10 and -20 models at better than or equal to 2 µm / 0.000079 in.
N.I.S.T. Traceability
Specify the calibration certificate and documentation required for the exact ordered configuration.
Final measurement performance depends on the exact gage configuration, component support, indicator selection, inspection method and calibration documentation.
Indicator Configuration
Configure each measurement position independently.
The two K2-20 indicators do not have to perform identical measurement roles. Each position should be selected around its required feature, access, range and resolution.
Indicator 1 · Standard Carrier
Define resolution, range, stylus reach, contact direction and primary measurement position.
Indicator 2 · Vertical Carrier
Define resolution, range, vertical contact geometry, carrier location and required clearance.
Calibration & accessories
Specify mounts, fine adjustment, analog or digital preference and required calibration documentation.
Manual & Motorized Rotation
Select rotational control around the inspection workflow.
Standard Architecture
Manual Rotation
Universal Punch literature describes a manual timing-belt pulley system for smooth, controlled rotational inspection.
Main rollers, top contact, rotation, Standard Carrier and Vertical Carrier positions work together as one K2-20 inspection configuration.
Optional · Part No. 278-20
K2-20 Variable Speed Motor Assembly
Universal Punch publishes 278-20 as the K2-20 Variable Speed Motor Assembly with a published 17 in / 432 mm base plate.
Current motor-drive documentation identifies a 24 VDC · 0–10 rpm · variable-speed · forward/reverse architecture. Confirm transformer, foot-switch and electrical options when quoting.
Ask About Motorizing the K2-20 →Model Selection
Choose the model from capacity and measurement access.
K2-20 vs. K1-20
| Feature | K2-20 | K1-20 |
|---|---|---|
| Indicator Positions | 2 | 2 |
| Part Diameter | 3/8–2 in / 10–50 mm | 3/8–2 in / 10–50 mm |
| Maximum Part Length | 6 in / 152 mm | 6 in / 152 mm |
| Primary Carrier | Standard | Standard |
| Second Carrier | Vertical Carrier | Side Carrier |
| Published Shipping Weight | 14.8 lb / 6.8 kg | 14.8 lb / 6.8 kg |
Choose K2-20 when the second indicator requires Vertical Carrier access.
Choose K1-20 when the second measurement requires Side Carrier access.
Because both share the same -20 capacity envelope, access direction is the primary distinction.
K2-20 vs. G2-20
K2-20
Dual Indicator
Standard Carrier + Vertical Carrier
Two configurable measurement positions around the same supported rotational setup.
G2-20
Vertical Carrier Architecture
One vertical-access measurement architecture
Choose when one Vertical Carrier inspection position is sufficient.
View G2-20 →K2-20 vs. KK2-20
K2-20
2 Measurement Positions
Standard Carrier + Vertical Carrier.
Choose when Standard and Vertical positions satisfy the inspection plan.
KK2-20
3 Measurement Positions
Standard Carrier + Side Carrier + Vertical Carrier.
Choose when an additional independent Side Carrier measurement position is required.
View KK2-20 →K2-Series Capacity Progression
| Model | Part Diameter | Maximum Part Length | Architecture |
|---|---|---|---|
| K2-10 | 1/8–1 in / 3–25 mm | 4 in / 102 mm | Standard + Vertical Carrier |
| K2-20 | 3/8–2 in / 10–50 mm | 6 in / 152 mm | Standard + Vertical Carrier |
| K2-40 | 3/4–4 in / 20–102 mm | 8 in / 203 mm | Standard + Vertical Carrier |
K2-Series definition:
K2-10, K2-20 and K2-40 preserve the same
Standard Carrier + Vertical Carrier dual-indicator architecture while increasing component capacity.
Universal Punch System Selection
Configure the K2-20 around the actual component.
K2-20 is part of a configurable inspection system. The application is defined by model selection, component support, indicator configuration, calibration requirements and rotational method.
1 · Select K2-20
Choose K2-20 when the -20 component envelope and
Standard + Vertical Carrier architecture match the application.
2 · Select support geometry
Choose the roller system from the component's usable cylindrical support lands,
adjacent geometry and measurement locations.
3 · Configure both indicators
Select indicator range, resolution, stylus, mounts, calibration documentation
and manual or motorized rotation.
K2-20 Technical FAQ
Common engineering questions about the K2-20.
What is the Universal Punch K2-20?
The Universal Punch K2-20 is a dual-indicator concentricity gage for cylindrical components from 3/8–2 in (10–50 mm) in diameter and up to 6 in (152 mm) long. It combines a Standard Carrier with a Vertical Carrier so two configurable indicator positions can be arranged around one supported rotating component.
What does K2-20 mean?
K2 identifies the Universal Punch dual-indicator architecture using a Standard Carrier plus Vertical Carrier. The -20 suffix identifies the 3/8–2 in (10–50 mm) component class.
What size parts can the K2-20 inspect?
The published K2-20 capacity is 3/8–2 in (10–50 mm) in diameter with part lengths up to 6 in (152 mm).
What are the published overall dimensions of the K2-20?
Published Universal Punch general data for the K1/K2-20 platform lists approximately 12.5 in (318 mm) overall length, 6.5 in (165 mm) width and approximately 6 in (152 mm) height.
How much does the K2-20 weigh?
The published K2-20 shipping weight is 14.8 lb (6.8 kg).
Why does the K2-20 use two indicators?
The K2-20 provides two configurable measurement-access positions around the same supported rotational setup. The first uses the Standard Carrier and the second uses the Vertical Carrier. The actual characteristics being inspected depend on the drawing, datum structure, indicator locations and inspection method.
What is the difference between K2-20 and K1-20?
Both are -20 dual-indicator gages with the same published size envelope. K2-20 uses a Standard Carrier plus Vertical Carrier, while K1-20 uses a Standard Carrier plus Side Carrier. Choose the model from the required second-indicator access direction.
What is the difference between K2-20 and G2-20?
G2-20 is a Vertical Carrier inspection architecture. K2-20 combines a Standard Carrier measurement position with an additional Vertical Carrier measurement position for dual-indicator inspection.
What is the difference between K2-20 and KK2-20?
K2-20 provides two configurable indicator positions using Standard plus Vertical Carrier architecture. KK2-20 adds an independent Side Carrier position, creating Standard plus Side plus Vertical Carrier measurement access.
What main roller configurations are available for K2-20?
Universal Punch publishes Full Plain 120-20FP, Half Plain 120-20HP and Quarter Plain 120-20QP main roller configurations for the -20 model class. Final support geometry should be selected from the actual component drawing and usable cylindrical support lands.
What is the standard -20 top roller?
Universal Punch documentation identifies 170-20, approximately 3/4 × 9/32 in (19 × 7 mm), as the standard -20 top roller. Final top-contact geometry should still be confirmed against the actual component and current production documentation.
Is K2-20 Precision Gold eligible?
Current Universal Punch documentation identifies Precision Gold for applicable -10 and -20 model classes. K2-20 is a -20 model, so it falls within the published eligible model classes. Confirm the exact ordered accuracy configuration when quoting.
What accuracy does Universal Punch publish for K2-20?
Universal Punch publishes Standard Black at better than or equal to 4 µm (0.00016 in) and Precision Gold at better than or equal to 2 µm (0.000079 in) for applicable -10 and -20 models. Final performance and calibration documentation should be confirmed for the exact ordered K2-20 configuration.
Is the K2-20 NIST traceable?
Universal Punch documentation states that its Concentricity Gaging Systems are calibrated and directly traceable to N.I.S.T. Confirm the specific calibration certificate and documentation required for the ordered configuration.
Can the K2-20 be motorized?
Yes. Universal Punch publishes Part No. 278-20 as the K2-20 Variable Speed Motor Assembly with a published 17 in (432 mm) base plate. Confirm the current electrical package and accessories when quoting.
What information should I send Universal Punch for a K2-20 quote?
Send the component drawing, maximum part diameter and length, usable support journals, support-land widths, shoulders, flanges, threads or grooves, both measurement locations, required vertical access, datum relationship, tolerance, desired indicator resolution, calibration requirements and manual or motorized preference.
Configure the K2-20 Around Your Part
Send the drawing and both measurement locations.
Universal Punch can review the component geometry and inspection requirement to help determine K2-20 support geometry, Standard Carrier position, Vertical Carrier position, indicators, calibration documentation and rotational configuration.
- component drawing or CAD print
- maximum part diameter
- overall part length
- usable cylindrical support journals
- support-land widths
- shoulders and flanges
- threads, splines and grooves
- measurement location #1
- measurement location #2
- required vertical indicator access
- datum relationship
- tolerance / indicator resolution
- calibration requirements
- manual or motorized preference
Request a K2-20 Quote →
Explore Concentricity Gages
Compare K1-20, G2-20, KK2-20, and K2-40 when selecting measurement access and component capacity.