K1-40 Dual Indicator Concentricity Gage
Two configurable measurement positions for larger cylindrical components.
The Universal Punch K1-40 is a large-capacity dual-indicator concentricity gage designed for cylindrical parts from 3/4–4 in (20–102 mm) in diameter and up to 8 in (203 mm) long.
Its defining K1 architecture combines a Standard Carrier with a Side Carrier, providing two configurable indicator contact positions around the same supported rotating component.
Correct model selection depends not only on component size, but also on where the inspection features are located and how each indicator must approach the part.
The large -40 dual-indicator gage with Standard + Side Carrier access.
K1 identifies Universal Punch's dual-indicator architecture using a Standard Carrier plus Side Carrier.
-40 identifies the larger Universal Punch size class for customer-facing applications from 3/4–4 in / 20–102 mm in diameter.
The K1-40 is intended for larger cylindrical components where two indicator positions are useful around one supported rotational setup and the second measurement location benefits from lateral access.
Two indicators are valuable because they create two measurement-access positions.
The defining benefit of the K1-40 is not simply that two indicators are present. It is the ability to configure a Standard Carrier measurement position and a second lateral Side Carrier position around one rotational setup.
Standard Carrier
Provides the primary configurable indicator position. Final contact location, stylus direction, range and resolution should be selected from the drawing and inspection plan.
Side Carrier
Provides lateral access to the rotating component. This second carrier position is the defining measurement-access feature of the K1 architecture.
The primary measurement position for the K1-40.
The Standard Carrier supports the first configurable indicator position around the rotating component. The final position should be derived from the actual print—not simply copied from a product photograph.
Lateral access is the feature that separates K1-40 from K2-40.
The second K1-40 indicator is configured using a Side Carrier. This creates lateral measurement access to the supported component.
Because both models occupy the same large -40 capacity class, the decisive difference is measurement access and carrier architecture, not diameter and length alone.
Large -40 capacity with dual measurement access.
Use the customer-facing capacity below for model selection. Final roller, carrier, indicator, accuracy and drive configuration should be confirmed when quoting.
| Specification | K1-40 Published Data |
|---|---|
| Model | K1-40 |
| Gage Type | Dual Indicator Concentricity Gage |
| Carrier Configuration | Standard Carrier + Side Carrier |
| Part Diameter | 3/4–4 in / 20–102 mm |
| Maximum Part Length | 8 in / 203 mm |
| Overall Gage Length | 14.5 in / 368 mm |
| Gage Width | 8 in / 203 mm |
| Approximate Height | 8 in / 203 mm |
| Published Shipping Weight | 18.5 lb / 8.4 kg |
A larger gage does not remove the need for correct support geometry.
Both K1-40 indicator positions reference the same supported rotational setup. Stable component support is therefore fundamental to the measurement system.
Evaluate journal diameter and width, shoulders, flanges, threads, splines, grooves, steps, diameter transitions, unsupported span, measurement location and component stiffness.
Confirm. Support. Position. Rotate. Interpret.
Represent the -40 accuracy class precisely.
K1-40 belongs to Universal Punch's large -40 model class. Current documentation should control how the accuracy classification is presented.
Final measurement performance depends on the exact gage configuration, support system, indicator selection, inspection procedure and calibration documentation.
Configure the two K1-40 measurement positions independently.
The two K1-40 indicators do not have to perform identical measurement roles. Each position should be configured around its individual inspection objective.
Choose the rotational method around the inspection workflow.
Manual Rotation
Universal Punch literature describes a manual timing-belt pulley system for smooth, controlled rotational inspection.
Component support, top contact, rotation and both indicator positions work together as one K1-40 inspection configuration.
K1-40 Variable Speed Motor Assembly
Universal Punch publishes 277-40 as the K1-40 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 current transformer, foot-switch and electrical options when quoting.
Ask About Motorizing the K1-40 →Size identifies the platform. Carrier access identifies the architecture.
K1-40 vs. K2-40
| Feature | K1-40 | K2-40 |
|---|---|---|
| Indicator Positions | 2 | 2 |
| Part Diameter | 3/4–4 in / 20–102 mm | 3/4–4 in / 20–102 mm |
| Maximum Part Length | 8 in / 203 mm | 8 in / 203 mm |
| Primary Carrier | Standard | Standard |
| Second Carrier | Side Carrier | Vertical Carrier |
| Published Shipping Weight | 18.5 lb / 8.4 kg | 18.5 lb / 8.4 kg |
K1-40 vs. G1-40
Dual Indicator
Standard Carrier + Side Carrier
Two configurable measurement positions around the same supported large-part rotational setup.
Side Checker
Side Carrier inspection architecture
Choose when one Side Carrier measurement position is sufficient.
View G1-40 →K1-40 vs. KK1-40
2 Measurement Positions
Standard Carrier + Side Carrier.
Choose when two configurable indicator positions satisfy the inspection plan.
3 Measurement Positions
Standard Carrier + Side Carrier + Side Carrier.
Choose when an additional independent lateral measurement position is required.
View KK1-40 →K1-20 vs. K1-40
| Feature | K1-20 | K1-40 |
|---|---|---|
| Architecture | Standard + Side | Standard + Side |
| Part Diameter | 3/8–2 in / 10–50 mm | 3/4–4 in / 20–102 mm |
| Maximum Part Length | 6 in / 152 mm | 8 in / 203 mm |
| Overall Gage Length | 12.5 in / 318 mm | 14.5 in / 368 mm |
| Published Shipping Weight | 14.8 lb / 6.8 kg | 18.5 lb / 8.4 kg |
K1-Series Capacity Progression
| Model | Part Diameter | Maximum Part Length | Architecture |
|---|---|---|---|
| K1-10 | 1/8–1 in / 3–25 mm | 4 in / 102 mm | Standard + Side Carrier |
| K1-20 | 3/8–2 in / 10–50 mm | 6 in / 152 mm | Standard + Side Carrier |
| K1-40 | 3/4–4 in / 20–102 mm | 8 in / 203 mm | Standard + Side Carrier |
Configure K1-40 in three engineering decisions.
Universal Punch's Concentricity Gaging System is best understood as a configurable inspection platform: select the model, select the component support, then configure the measurement hardware and rotation.
Current production information takes precedence over historical literature.
Universal Punch has decades of published concentricity-gage literature. Some legacy documents may contain older roller references, dimensional conventions or accessory configurations.
This transparency is intentional. A manufacturer authority page should distinguish current production guidance from historical documentation rather than silently merging conflicting specifications.
Common engineering questions about the K1-40.
What is the Universal Punch K1-40?
The Universal Punch K1-40 is a dual-indicator concentricity gage for cylindrical components from 3/4–4 in (20–102 mm) in diameter and up to 8 in (203 mm) long. It combines a Standard Carrier with a Side Carrier so two configurable indicator positions can be arranged around the same supported rotating component.
What does K1-40 mean?
K1 identifies the Universal Punch dual-indicator architecture using a Standard Carrier plus Side Carrier. The -40 suffix identifies the large 3/4–4 in (20–102 mm) component class.
What size parts can the K1-40 inspect?
The customer-facing published K1-40 capacity is 3/4–4 in (20–102 mm) in diameter with part lengths up to 8 in (203 mm).
What are the published overall dimensions of the K1-40?
Published Universal Punch general data for the K1/K2-40 platform 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 K1-40 weigh?
The published K1-40 shipping weight is 18.5 lb (8.4 kg).
Why does the K1-40 use two indicators?
The K1-40 provides two configurable measurement-access positions around the same supported rotational setup. The first uses the Standard Carrier and the second uses the Side Carrier. The actual characteristics being inspected depend on the drawing, datum structure, indicator locations and inspection method.
What is the difference between K1-40 and K2-40?
Both are large -40 dual-indicator gages with similar published capacity. K1-40 uses a Standard Carrier plus Side Carrier, while K2-40 uses a Standard Carrier plus Vertical Carrier. Choose the model from the required second-indicator access direction.
What is the difference between K1-40 and G1-40?
G1-40 is a Side Checker architecture using Side Carrier measurement access. K1-40 combines a Standard Carrier measurement position with an additional Side Carrier position for dual-indicator inspection.
What is the difference between K1-40 and KK1-40?
K1-40 provides two configurable indicator positions using Standard plus Side Carrier architecture. KK1-40 extends that concept to three measurement positions using a Standard Carrier plus two Side Carriers.
What main roller configurations are available for K1-40?
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 component drawing and usable cylindrical support lands.
What is the standard -40 top roller?
Current Universal Punch parts documentation identifies 230-40, approximately 1 × 5/16 in (25 × 8 mm), as the current standard -40 top roller. Historical documentation has published other -40 top-contact configurations, so final production configuration should be confirmed when quoting.
Is K1-40 Precision Gold eligible?
Current Universal Punch documentation identifies Precision Gold for applicable -10 and -20 model classes. K1-40 is a -40 model, so it should not be represented as a Precision Gold model without a specific current engineering confirmation.
What accuracy does Universal Punch publish for K1-40?
Universal Punch publishes its Standard Black concentricity-gage classification as better than or equal to 4 µm (0.00016 in). Final accuracy, indicators and calibration documentation should be confirmed for the exact ordered K1-40 configuration.
Is the K1-40 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 K1-40 be motorized?
Yes. Universal Punch publishes Part No. 277-40 as the K1-40 Variable Speed Motor Assembly with a published 19 in (482 mm) base plate. Confirm the current electrical package and accessories when quoting.
What does the K1-40 measure?
The K1-40 does not inherently define two fixed measurement characteristics. What each indicator evaluates is determined by the component support, indicator contact locations, datum structure, tolerance and inspection procedure.
What information should I send Universal Punch for a K1-40 quote?
Send the component drawing, maximum part diameter and length, usable support journals, support-land widths, shoulders, flanges, threads or grooves, both measurement locations, datum relationship, tolerance, desired indicator resolution, calibration requirements and manual or motorized preference.
Send the drawing and both measurement locations.
Universal Punch can use the actual component geometry and inspection requirement to help determine the appropriate K1-40 roller support, Standard Carrier position, Side Carrier position, indicators, calibration documentation and manual or motorized 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
- datum relationship
- tolerance / indicator resolution
- calibration requirements
- manual or motorized preference
- production inspection requirements
Compare K1-20, K2-40, G1-40, and KK1-40 when selecting component capacity, measurement access and number of indicator positions.