Choose K2-40 when the part fits the -40 envelope, two indicator positions are needed, and the second measurement requires vertical access.
Universal Punch Concentricity Gaging System
K2 Series · -40
Dual Indicator · Standard + Vertical Carrier
K2-40 Dual Indicator Concentricity Gage
Two configurable measurement positions for larger cylindrical components.
The Universal Punch K2-40 expands the K2 dual-indicator architecture to cylindrical components from 3/4–4 in (20–102 mm nominal) in diameter and up to 8 in (203 mm) long.
Its defining architecture combines a Standard Carrier with a Vertical Carrier, creating two configurable indicator positions around one supported rotating component.
Choose K2-40 when the application requires the -40 component envelope, two indicator positions, and vertical access for the second measurement.
Technical page last updated:
September 1, 2026.
Confirm current production configuration when quoting.
K2-40 Definition
K2 architecture with the large -40 inspection envelope.
K2 identifies Universal Punch's dual-indicator Standard Carrier + Vertical Carrier architecture.
-40 identifies the large component class used for nominal 3/4–4 in cylindrical parts and part lengths up to 8 in / 203 mm.
The Universal Punch K2-40 is a large-capacity dual-indicator concentricity gage
using Standard Carrier + Vertical Carrier measurement access
around one supported rotational setup.
Metric-capacity documentation note:
Universal Punch documentation consistently identifies K2-40 as the large -40 model class.
Current parts documentation uses a 20–105 mm metric reference,
while the nominal 3/4–4 in customer-facing envelope converts to approximately
20–102 mm. Confirm the actual component diameter and current production capability when quoting.
Application Decision Guide
Is K2-40 the right concentricity gage for your application?
First confirm the larger -40 component envelope. Then select the carrier architecture from the number and direction of measurement positions required by the print.
Use the same large -40 capacity class when the second indicator needs lateral Side Carrier access.
Choose G2-40 when one Vertical Carrier inspection position is sufficient.
Choose KK2-40 when the large component requires three independently configurable measurement positions.
Dual-Indicator Architecture
Two measurement positions. One supported rotational setup.
K2-40 combines a Standard Carrier measurement position with a second Vertical Carrier measurement position around the same large-capacity support system.
Measurement Position 1
Standard Carrier
Establishes the primary configurable indicator position. Determine contact location, range, resolution, stylus and approach from the drawing and inspection plan.
Measurement Position 2
Vertical Carrier
Provides the vertical-access measurement position that defines the K2 family. Use it when the second inspection feature benefits from a vertical probe approach.
The defining capability of K2-40 is not merely two indicators.
It is Standard Carrier + Vertical Carrier measurement access
on the large -40 support platform.
Standard Carrier
Configure the first measurement position from the component drawing.
The Standard Carrier establishes the primary K2-40 indicator position. Final setup should reflect the actual inspection feature, datum relationship and available component clearance.
Inspection feature
Identify the journal, diameter, face, shoulder or other feature being evaluated.
Datum relationship
Define what the indicator response represents relative to the supported rotational axis.
Probe clearance
Account for larger shoulders, flanges, grooves, threads, splines and diameter transitions.
Indicator selection
Choose range, resolution, stylus reach and contact direction from the actual tolerance.
Configuration principle:
K2-40 product photography shows example indicator positioning.
Final Standard Carrier setup should be based on the actual drawing and inspection requirement.
Vertical Carrier Architecture
Vertical Carrier access separates K2-40 from K1-40.
The second K2-40 measurement position uses a Vertical Carrier, creating a vertically oriented probe location relative to the supported component.
Choose K2-40 when the second measurement requires Vertical Carrier access.
Choose K1-40 when the second measurement requires Side Carrier access.
Because K1-40 and K2-40 serve essentially the same large-capacity size class, the direction of second-indicator access is the primary architectural distinction.
Published K2-40 General Data
K2-40 specifications and large-capacity envelope.
Use published capacity as an initial model-selection reference. Confirm actual support geometry, metric capacity, indicators, calibration and drive configuration when quoting.
Nominal Part Diameter
3/4–4 in
20–102 mm customer-facing
Part Length
Up to 8 in
203 mm
Carrier Architecture
Standard + Vertical
Dual indicator
Overall Length
14.5 in
368 mm
Width / Approx. Height
8 in / 8 in
203 mm / 203 mm
Shipping Weight
18.5 lb
8.4 kg
| Specification | K2-40 Published / Current Reference |
|---|---|
| Model | K2-40 |
| Gage Type | Dual Indicator Concentricity Gage |
| Carrier Configuration | Standard Carrier + Vertical Carrier |
| Nominal Part Diameter | 3/4–4 in |
| Customer-Facing Metric Range | 20–102 mm |
| Current Parts-List Metric Class Reference | 20–105 mm |
| Maximum Part Length | 8 in / 203 mm |
| Approx. Overall Gage Length | 14.5 in / 368 mm |
| Approx. Gage Width | 8 in / 203 mm |
| Approx. Gage Height | 8 in / 203 mm |
| Published Shipping Weight | 18.5 lb / 8.4 kg |
-40 Roller Selection
Select support geometry from the actual component.
Both K2-40 indicators reference the same supported rotational setup. Correct -40 roller and top-contact selection is therefore fundamental to the complete inspection system.
140-40FP · Full Plain
Full plain main roller set for suitable large cylindrical support geometry.
140-40HP · Half Plain
Half plain support where shoulders, transitions or nearby component geometry require additional clearance.
140-40QP · Quarter Plain
Quarter plain support for narrower or more constrained cylindrical support lands.
Engineering rule:
a 4-inch component diameter does not automatically determine the correct K2-40 roller set.
Main roller geometry should be selected from the actual usable support surfaces on the component.
Evaluate cylindrical support-land width, adjacent shoulders, flange clearance, grooves, threads, splines, diameter transitions, support spacing, unsupported span, component stiffness and both indicator measurement locations.
Published -40 top roller reference:
Universal Punch documentation identifies 230-40,
approximately 1 × 5/16 in (25 × 8 mm),
as the standard -40 top roller.
Other published -40 top-contact sizes include 3/4 × 1/2 in, 7/8 × 1/2 in,
1 × 5/8 in, 1-1/8 × 5/8 in and 1-1/4 × 3/4 in configurations.
How K2-40 Is Configured
Confirm. Support. Position. Rotate. Interpret.
01
Confirm K2-40 capacity.
Verify component diameter, length and usable support geometry against the -40 platform.
02
Select -40 main rollers.
Configure stable support from the actual cylindrical support lands.
03
Configure the Standard Carrier.
Position the first indicator from the drawing, datum relationship and measurement objective.
04
Configure the Vertical Carrier.
Position the second indicator for vertical feature access.
05
Rotate the component.
Use controlled rotation through the required inspection cycle.
06
Interpret both readings.
Evaluate each indicator according to the applicable datum structure, tolerance and inspection method.
Both K2-40 indicators reference the same supported rotational setup,
while each indicator may be configured for a different feature or measurement location.
Accuracy & Calibration
K2-40 belongs to the Standard Black -40 accuracy class.
Current Universal Punch documentation identifies Precision Gold for applicable -10 and -20 models only. K2-40 is a -40 model and should therefore be represented under the published Standard Black classification unless a different current production capability is specifically confirmed.
Standard Black
Published system classification of better than or equal to 4 µm / 0.00016 in.
Precision Gold
Not represented here as a K2-40 offering because current documentation limits Precision Gold to applicable -10 and -20 models.
N.I.S.T. Traceability
Specify the calibration certificate and traceability documentation required for the exact ordered configuration.
Final measurement performance depends on the exact gage configuration, support geometry, indicator selection, inspection method and calibration documentation.
Indicator Configuration
Configure each K2-40 measurement position independently.
The two indicators do not have to perform identical measurement roles. Each measurement position should be selected around its required feature, range, resolution, stylus and access direction.
Indicator 1 · Standard Carrier
Define range, resolution, stylus reach, contact direction and primary measurement position.
Indicator 2 · Vertical Carrier
Define range, resolution, vertical contact geometry, carrier location and larger-component clearances.
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 complete K2-40 inspection configuration.
Optional · Part No. 278-40
K2-40 Variable Speed Motor Assembly
Universal Punch publishes 278-40 as the K2-40 Variable Speed Motor Assembly with a published 19 in / 482 mm base plate.
Current motor-drive documentation identifies a 24 VDC · 0–10 rpm · variable-speed · forward/reverse architecture. Confirm transformer, foot-switch and current electrical accessories when quoting.
Ask About Motorizing the K2-40 →Model Selection
Choose the large-capacity model from measurement access.
K2-40 vs. K1-40
| Feature | K2-40 | K1-40 |
|---|---|---|
| Indicator Positions | 2 | 2 |
| Nominal Part Diameter | 3/4–4 in | 3/4–4 in |
| Maximum Part Length | 8 in / 203 mm | 8 in / 203 mm |
| Primary Carrier | Standard | Standard |
| Second Carrier | Vertical Carrier | Side Carrier |
| Published Shipping Weight | 18.5 lb / 8.4 kg | 18.5 lb / 8.4 kg |
K1-40 and K2-40 serve essentially the same large-capacity size class.
Select between them primarily by the required direction of the second indicator:
Side Carrier for K1-40 and Vertical Carrier for K2-40.
K2-40 vs. G2-40
K2-40
Dual Indicator
Standard Carrier + Vertical Carrier
Two configurable measurement positions around one large-capacity supported rotational setup.
G2-40
Vertical Carrier Architecture
One vertical-access measurement architecture
Choose when one Vertical Carrier inspection position is sufficient.
View G2-40 →K2-40 vs. KK2-40
K2-40
2 Measurement Positions
Standard Carrier + Vertical Carrier.
Choose when Standard and Vertical access satisfy the inspection plan.
KK2-40
3 Measurement Positions
Standard Carrier + Side Carrier + Vertical Carrier.
Choose when the large component additionally requires an independent Side Carrier position.
View KK2-40 →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 nominal | 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 K2-40 around the complete inspection requirement.
The K2-40 is a configurable inspection system. Final application depends on gage selection, support geometry, both indicator positions, accuracy and calibration requirements, and rotational method.
1 · Select K2-40
Confirm the large -40 component envelope and
Standard + Vertical Carrier dual-indicator architecture.
2 · Select support geometry
Choose -40 main rollers and top contact from the actual support journals,
clearances and measurement features.
3 · Configure both indicators
Determine Standard and Vertical Carrier positions, indicator ranges,
resolutions, styli, mounts and fine adjustment.
4 · Define accuracy & calibration
Specify Standard Black requirements and the calibration or traceability documentation needed for the inspection plan.
5 · Select rotation
Choose manual rotation or the optional 278-40 variable-speed motor package around the production workflow.
6 · Review the complete application
Validate the setup from the component drawing rather than selecting accessories independently.
K2-40 Technical FAQ
Common engineering questions about the K2-40.
What is the Universal Punch K2-40?
The Universal Punch K2-40 is a large-capacity dual-indicator concentricity gage for cylindrical components from 3/4–4 in (20–102 mm nominal customer-facing range) in diameter and up to 8 in (203 mm) long. It combines a Standard Carrier with a Vertical Carrier so two configurable indicator positions can be arranged around one supported rotational setup.
What does K2-40 mean?
K2 identifies the Universal Punch dual-indicator architecture using a Standard Carrier plus Vertical Carrier. The -40 suffix identifies the large component class used for nominal 3/4–4 in cylindrical parts.
What size parts can the K2-40 inspect?
The customer-facing nominal K2-40 range is 3/4–4 in (approximately 20–102 mm) in diameter with part lengths up to 8 in (203 mm). Current parts documentation also references the -40 metric class as 20–105 mm. Confirm the actual component diameter and current production capability when quoting.
Why are both 20–102 mm and 20–105 mm associated with K2-40?
The nominal 3/4–4 in customer-facing range converts to approximately 20–102 mm, while current Universal Punch parts documentation uses a 20–105 mm metric class reference for the -40 platform. Both refer to the large -40 model family. Confirm the exact production envelope for the application when quoting.
What are the published overall dimensions of the K2-40?
Published K1/K2-40 general data lists approximately 14.5 in (368 mm) overall length, 8 in (203 mm) width and approximately 8 in (203 mm) height.
How much does the K2-40 weigh?
The published K2-40 shipping weight is 18.5 lb (8.4 kg).
Why does the K2-40 use two indicators?
K2-40 provides two configurable measurement-access positions around the same supported rotational setup. The first uses a Standard Carrier and the second uses a Vertical Carrier. What each indicator evaluates depends on the drawing, support geometry, datum structure and inspection method.
What is the difference between K2-40 and K1-40?
K2-40 and K1-40 share the large -40 capacity class and both use two indicator positions. K2-40 uses Standard plus Vertical Carrier architecture, while K1-40 uses Standard plus Side Carrier architecture. Select between them primarily by the required direction of the second indicator.
What is the difference between K2-40 and G2-40?
G2-40 uses a Vertical Carrier inspection architecture. K2-40 adds a Standard Carrier measurement position so two indicator positions can be configured around the same supported rotational setup.
What is the difference between K2-40 and KK2-40?
K2-40 uses Standard plus Vertical Carrier architecture for two measurement positions. KK2-40 adds an independent Side Carrier position, creating Standard plus Side plus Vertical Carrier measurement access.
What main roller configurations are published for K2-40?
Universal Punch publishes Full Plain 140-40FP, Half Plain 140-40HP and Quarter Plain 140-40QP main roller configurations for the -40 model class. Final support geometry should be selected from the actual usable cylindrical support lands on the component.
What is the standard -40 top roller?
Universal Punch documentation identifies 230-40, approximately 1 × 5/16 in (25 × 8 mm), as the standard -40 top roller. Other -40 top roller sizes are also published. Confirm final top-contact geometry against the actual component.
Is K2-40 a Precision Gold gage?
Current Universal Punch documentation identifies Precision Gold for applicable -10 and -20 model classes only. K2-40 is a -40 model and should therefore be represented under the Standard Black classification unless a different current production capability is specifically confirmed by Universal Punch.
What accuracy classification applies to K2-40?
Universal Punch publishes Standard Black at better than or equal to 4 µm (0.00016 in). Final performance and calibration documentation should be confirmed for the exact ordered K2-40 configuration.
Is the K2-40 NIST traceable?
Universal Punch documentation states that its Concentricity Gaging Systems are calibrated and directly traceable to N.I.S.T. Confirm the calibration certificate and documentation required for the ordered configuration.
Can the K2-40 be motorized?
Yes. Universal Punch publishes Part No. 278-40 as the K2-40 Variable Speed Motor Assembly with a published 19 in (482 mm) base plate. Confirm current electrical accessories and options when quoting.
What information should I send Universal Punch for a K2-40 quote?
Send the component drawing, maximum part diameter and length, usable support journals, support-land widths, shoulders, flanges, threads, splines or grooves, both measurement locations, required vertical access, datum relationship, tolerance, desired indicator resolution, calibration requirements and manual or motorized preference.
Configure the K2-40 Around Your Part
Send the drawing and both measurement locations.
Universal Punch can review the component geometry and inspection requirement to help determine K2-40 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
- support-journal diameters
- support-land widths
- shoulders and flanges
- threads, splines and grooves
- measurement location #1
- measurement location #2
- required vertical indicator access
- datum relationship
- inspection tolerance
- indicator resolution
- calibration requirements
- manual or motorized preference
- production inspection volume
Request a K2-40 Quote →
Explore Concentricity Gages
Compare K1-40, G2-40, KK2-40, and K2-20 when selecting measurement access and component capacity.