J-40 Low Profile Concentricity Gage
Large-part concentricity and runout inspection in a compact Surface Plate / Comparator architecture.
The Universal Punch J-40 is the large-capacity model in the J-Series low-profile concentricity-gage family. It is designed for cylindrical components from 3/4–4 in (20–102 mm) in diameter and up to 8 in (203 mm) long.
The J-40 combines Universal Punch's -40 large-diameter inspection class with a compact Surface Plate or Comparator Gage architecture for applications where large component capacity and a relatively small inspection footprint are both important.
The large-capacity low-profile gage in the J Series.
J Series identifies Universal Punch's compact low-profile Surface Plate / Comparator inspection architecture. -40 identifies the large-diameter model class.
The J-40 is intended for components that require significantly more diameter capacity than the J-20, but do not require the long shaft-oriented base architecture of the H or HL families.
Large component capacity without a long shaft-gage base.
The J-40 is designed for applications where engineers need the large -40 diameter class but still prefer a compact Surface Plate / Comparator inspection platform.
When the J-40 is the right architecture
Large -40 capacity in the compact J-Series platform.
| Specification | J-40 Published Data |
|---|---|
| Model | J-40 |
| Gage Type | Low Profile / Surface Plate / Comparator Gage |
| Part Diameter | 3/4–4 in / 20–102 mm |
| Maximum Part Length | 8 in / 203 mm |
| Overall Gage Length | 8.5 in / 216 mm |
| Published Shipping Weight | 9.2 lb / 4.2 kg |
The correct J-40 setup starts with the support geometry.
Universal Punch publishes multiple main-roller geometries for the -40 class so support can be configured around the actual component rather than overall diameter alone.
Current Universal Punch model documentation identifies 230-40, approximately 1 × 5/16 in (25 × 8 mm), as the current standard -40 top roller.
Build the measurement system around the drawing.
Universal Punch concentricity gages are configurable systems. Indicator resolution, range, stylus length, contact direction and mounting arrangement should all be chosen from the actual tolerance and inspection feature.
Specify the measurement requirement—then configure the gage.
Universal Punch's concentricity-gaging program supports precision rotational inspection, configurable indicators and calibration / traceability requirements.
Accuracy claims should always correspond to the exact ordered J-40 configuration, indicator system and calibration documentation.
Configure rotation around the inspection process.
Manual Rotation
The standard Universal Punch concentricity-gage architecture uses controlled manual part rotation so the indicator can monitor radial variation around the measured feature.
Stable support geometry, top contact, rotational control and indicator contact should be treated as one complete measurement system.
J-40 Variable Speed Motor Assembly
Universal Punch publishes a dedicated 276-40 J-40 Variable Speed Motor Assembly.
Current documentation identifies a 13 in / 318 mm base plate. Confirm the current voltage, speed-control package, transformer and foot-switch options when quoting.
Ask About Motorizing the J-40 →Use capacity first. Then choose the right inspection architecture.
J-40 vs. J-20
| Feature | J-20 | J-40 |
|---|---|---|
| Architecture | Surface Plate / Comparator | Surface Plate / Comparator |
| 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 |
| Published Shipping Weight | 4.4 lb / 2.0 kg | 9.2 lb / 4.2 kg |
J-40 vs. G2-40
Surface Plate / Comparator
3/4–4 in / 20–102 mm
Up to 8 in / 203 mm part length.
Choose when a compact low-profile Surface Plate / Comparator architecture matches the inspection environment.
Side Checker · Vertical Carrier
-40 large-diameter class
Up to 8 in / 203 mm part length.
Choose when a Vertical Carrier Side Checker configuration provides better access to the measurement feature.
View G2-40 →J-40 vs. H-40
Compact Low-Profile Platform
Surface Plate / Comparator architecture.
Maximum published part length: 8 in / 203 mm.
Standard Shaft Gage
Vertical Carrier shaft-gage architecture.
Maximum published part length: 12 in / 305 mm.
View H-40 →J-Series Capacity Progression
| Model | Part Diameter | Maximum Part Length | Architecture |
|---|---|---|---|
| JSLP-10 / JLP-10 / J-10 | 1/8–1 in / 3–25 mm | 4 in / 102 mm | Low Profile / Comparator |
| J-20 | 3/8–2 in / 10–50 mm | 6 in / 152 mm | Surface Plate / Comparator |
| J-40 | 3/4–4 in / 20–102 mm | 8 in / 203 mm | Surface Plate / Comparator |
Configure the J-40 in three engineering decisions.
The Universal Punch Concentricity Gaging System is best understood as a configurable inspection platform: choose the model, choose the support rollers, then configure the measurement hardware.
Common engineering questions about the J-40.
What is the Universal Punch J-40?
The Universal Punch J-40 is a low-profile Surface Plate or Comparator Concentricity Gage for cylindrical components from 3/4–4 in (20–102 mm) in diameter and up to 8 in (203 mm) long.
What is the J-40 used for?
The J-40 is used for precision concentricity and rotational runout inspection when a large-capacity, compact Surface Plate / Comparator gage architecture is appropriate.
What diameter range does the J-40 handle?
The customer-facing published J-40 diameter range is 3/4–4 in (20–102 mm).
What is the maximum part length for the J-40?
The published maximum part length is 8 in (203 mm).
How much does the J-40 weigh?
The published J-40 shipping weight is 9.2 lb (4.2 kg).
What main roller styles are available for the J-40 size class?
Universal Punch publishes Full Plain, Half Plain and Quarter Plain main roller configurations for the -40 model class. Final support geometry should be selected from the actual component drawing.
What is the standard -40 top roller?
Current Universal Punch model documentation identifies 230-40, approximately 1 × 5/16 in (25 × 8 mm), as the current standard -40 top roller. Final production configuration should be confirmed when ordering.
Can the J-40 use digital indicators?
Universal Punch offers multiple analog and digital indicator options together with mounts, extensions and fine-adjustment accessories. The exact indicator should be selected from the required resolution, range, contact direction and stylus reach.
Is the J-40 NIST traceable?
Universal Punch supports NIST-traceable measurement and calibration within its concentricity-gaging program. Confirm the required calibration documentation for the ordered configuration.
Can the J-40 be motorized?
Yes. Universal Punch publishes Part No. 276-40 as the J-40 Variable Speed Motor Assembly. Confirm the current electrical package and accessories when quoting.
What is the difference between the J-40 and G2-40?
Both occupy the large -40 capacity class, but they use different architectures. The J-40 is a low-profile Surface Plate / Comparator Gage, while the G2-40 is a Side Checker Gage with a Vertical Carrier.
What is the difference between the J-40 and H-40?
The J-40 is a compact Surface Plate / Comparator Gage for parts up to 8 in long. The H-40 is a Standard Shaft Gage with a Vertical Carrier for longer shaft-style parts up to 12 in long.
Send the print. Let the component define the inspection setup.
Universal Punch can use the actual component geometry and measurement requirement to help determine the appropriate J-40 support rollers, top contact, indicator system, calibration requirements and manual or powered rotational configuration.
- part drawing or CAD print
- maximum part diameter
- overall part length
- support-journal diameters
- usable support widths
- shoulders and flanges
- threads and grooves
- inspection feature
- datum relationship
- tolerance
- required indicator resolution
- manual or motorized preference