Precision concentricity and runout inspection for shafts up to 12 inches long.
The Universal Punch H-20 is a Standard Shaft Concentricity Gage with a Vertical Carrier,
designed for cylindrical shafts and elongated components that require substantially more inspection length than a conventional -20 platform.
Published capacity is 3/8–2 in (10–50 mm) diameter with part lengths up to 12 in (305 mm).
The H-20 combines the -20 diameter class with dedicated H/HL shaft-support architecture, allowing long cylindrical components to be supported while the indicator is positioned vertically over the required inspection feature.
H-20 · Standard Shaft Gage · Vertical Carrier. The -20 shaft platform is published for 10–50 mm diameter parts up to 305 mm long.
Part Diameter3/8–2 in10–50 mm
Part LengthUp to 12 in305 mm
ArchitectureStandard ShaftVertical Carrier
Shipping Weight8.5 lb3.9 kg
What Is the H-20?
A purpose-built concentricity gage for longer shafts.
The H-20 extends the Universal Punch -20 concentricity-gaging class specifically for longer cylindrical parts.
H identifies the Standard Shaft Gage architecture, while -20 identifies the
3/8–2 in / 10–50 mm diameter class.
Where many standard -20 Universal Punch platforms publish a maximum part length of approximately 6 in,
the H-20 increases published capacity to 12 in / 305 mm. It is therefore selected when a part remains within the -20 diameter class but requires a substantially longer support and inspection envelope.
H-20 long-shaft architecture. The extended shaft platform allows widely spaced support and measurement locations within the published 12 in part-length envelope.
Standard Shaft Architecture
Select the H-20 when diameter fits the -20 class but shaft length drives the application.
Long-shaft inspection is not only a question of nominal diameter. The support journals, distance between support locations,
shoulders, splines, grooves, threads, shaft stiffness, overhang and measurement feature all influence the final H-20 configuration.
01
Identify the inspection feature
Define the diameter, shoulder, journal or other rotational feature being evaluated and its datum relationship.
02
Identify support journals
Select stable cylindrical surfaces and confirm usable support widths around adjacent geometry.
03
Position the Vertical Carrier
Place the indicator above the required feature with appropriate stylus direction, range and clearance.
04
Control long-shaft support
Use H/HL roller and support accessories appropriate to journal spacing, overhang and the component drawing.
Selection principle: choose H-20 based on both diameter and shaft length—not diameter alone.
Published H-20 General Data
The -20 shaft platform extends part length to 12 inches.
Model
H-20
Gage Type
Standard Shaft Gage
Carrier
Vertical Carrier
Part Diameter
0.37–2 in / 10–50 mm
Part Length
0.18–12 in / 4.7–305 mm
Gage Length
12.5 in / 318 mm
Gage Width
5.5 in / 140 mm
Gage Height
Approx. 9 in / 229 mm
Shipping Weight
8.5 lb / 3.9 kg
Customer-facing capacity: use the cleaner selection specification of 3/8–2 in (10–50 mm) diameter and up to 12 in (305 mm) part length.
Vertical measurement access. Indicator style, stylus geometry and carrier position should be selected from the actual measurement feature and tolerance.
H / HL Shaft Roller System
Dedicated short rollers support the shaft-gaging architecture.
Current Universal Punch parts documentation separates the H and HL families from the general Full Plain / Half Plain / Quarter Plain roller listing and publishes dedicated Full Plain Short Roller Sets for H-10, H-20 and H-40.
H-10 Full Plain Short Set110-10HS · 0.6 in / 16 mm
H-20 Full Plain Short Set120-20HS · 0.8 in / 22 mm
H-40 Full Plain Short Set140-40HS · 1.0 in / 25 mm
H-20 dedicated shaft roller set
120-20HSFull Plain Short Roller Set · approx. 0.8 in / 22 mm roller length
Support geometry must come from the actual shaft.
The correct H-20 setup depends on journal width, shoulders, splines, grooves, threads, bearing surfaces,
distance between support points, shaft stiffness, overhang and the feature being inspected.
Support journal width
Shoulder clearance
Spline / groove location
Support-point spacing
Shaft stiffness
Inspection feature
Engineering principle: two shafts with the same diameter can require different support geometry. Select the roller and accessory system from the print, not the nominal diameter alone.
H-20 Short Roller120-20HSDedicated Full Plain Short Roller Set for the -20 H/HL shaft class.Standard -20 Top Roller170-203/4 × 9/32 in · 19 × 7 mm, published as standard for -20 models.Long-Shaft SupportH / HL AccessoriesDedicated support, carrier, stop and end-support components are published for the shaft families.
Indicator Configuration
Configure the measurement system around the tolerance.
Universal Punch publishes a broad selection of analog and digital test indicators together with indicator mounts,
swivel supports and carrier attachments. The H-20 should therefore be configured around the actual inspection requirement rather than being locked into one indicator type.
H-20 shaft support and measurement detail. Long-shaft support, carrier position and indicator contact should be treated as one inspection system.
H & HL Accessories
The H-20 is a configurable shaft-inspection system, not simply a fixture.
Universal Punch publishes a dedicated H/HL accessory family for long-shaft applications. This expands the H-20 beyond its base frame and allows support and measurement access to be configured around actual component geometry.
Shaft Support
Support and end-control options
Published H/HL categories include support roller assemblies, wide end roller supports, end roller supports, fixed carbide Vee assemblies, stops and pusher components.
Measurement Access
Carrier and indicator options
Published H/HL categories include horizontal indicator carriers, front horizontal carriers, vertical indicator carriers, fine-adjustment attachments, vertical roller checker carriers and end dial-test-indicator carriers.
Why this matters: a 12-inch shaft may require very different support spacing and measurement access than another shaft of the same diameter. The H-20 platform is designed to be configured around those differences.
Published Accuracy Classes
The -20 class is published in Standard Black and Precision Gold accuracy tiers.
Standard Black
Standard production classification
≤4 µm0.00016 in published accuracy
Current parts documentation states that the Concentricity Gaging System classifications are calibrated and directly traceable to NIST.
Precision Gold · -10 / -20 Classes
Higher published accuracy classification
≤2 µm0.000079 in published accuracy
Because H-20 is a -20 model, it is within the model class for which Precision Gold is published. Confirm the final ordered H-20 configuration and calibration package when quoting.
Manual Part Rotation
Smooth controlled shaft rotation is fundamental to rotational inspection.
Universal Punch documents a manual timing-belt pulley drive architecture that provides smooth part rotation during inspection.
The H/HL accessory list also publishes dedicated timing-belt sets for H and HL models.
As the supported shaft rotates, the indicator tracks variation at the selected measurement feature. Roller support, shaft loading, indicator contact and rotation method should all be treated as part of one measurement setup.
Standard conceptManual rotation
Drive architectureTiming-belt pulley
H / HL supportDedicated belt sets
Optional upgradeVariable-speed motor
Optional Powered Rotation
A dedicated H-20 variable-speed motor assembly is currently published.
Current Universal Punch parts documentation lists Part No. 274-20 — H-20 Variable Speed Motor Assembly
with a 17 in / 432 mm base plate. The current drive-system section identifies
24 VDC / 0–10 rpm operation with forward/reverse control and 110/220 VAC transformer support.
H-20 vs. G2-20: both are -20 Vertical Carrier configurations, but H-20 is the Standard Shaft architecture and doubles the published maximum part length from 6 in to 12 in.
Standard Shaft
H-20
Up to 12 in / 305 mm long 8.5 lb / 3.9 kg shipping weight
Extended Shaft
HL-20
Up to 24 in / 610 mm long 26.5 lb / 12 kg published shipping weight
Universal Punch documents the H-20 as part of a complete modular concentricity gaging system.
Universal Punch documentation defines the Concentricity Gaging System around three choices: select the gage model, select the main rollers, and select the indicator(s) / accessories.
For an H-20 application, that means selecting the -20 Standard Shaft platform, configuring H/HL shaft support around the actual journals, and then configuring the indicator and drive system around the feature and tolerance.
This first-party model page brings together H-20 capacity, shaft roller information, H/HL accessories, indicator options, published accuracy classes and motorized-drive information so engineers can evaluate the complete platform in one place.
Current Model SelectionH-20 · Standard Shaft Gage · Vertical Carrier
10–50 mm / -20 model class with 12 in published shaft capacity.
Dedicated H-20 Roller System120-20HS · Full Plain Short Rollers
Approx. 0.8 in / 22 mm roller length for the H-20 shaft class.
Published Standard Top Roller170-20 · 3/4 × 9/32 in · 19 × 7 mm
Published standard top roller for -20 models.
Accuracy ClassesStandard Black ≤4 µm · Precision Gold ≤2 µm
Precision Gold is published for -10 / -20 model classes; confirm the final ordered H-20 calibration configuration.
Current Motorized Option274-20 · H-20 Variable Speed Motor Assembly
17 in / 432 mm base with current 24 VDC / 0–10 rpm variable-speed architecture.
H-20 Technical FAQ
Questions engineers, quality teams and buyers ask before specifying a long-shaft concentricity gage.
The Universal Punch H-20 is a Standard Shaft Concentricity Gage with a Vertical Carrier for cylindrical shafts from 3/8–2 in (10–50 mm) in diameter and up to 12 in (305 mm) long.
The published H-20 diameter class is 3/8–2 in (10–50 mm), with part lengths up to 12 in (305 mm).
Universal Punch publishes a maximum part length of 12 in (305 mm) for the H-20.
Universal Punch publishes an H-20 shipping weight of 8.5 lb (3.9 kg).
Current general data lists approximately 12.5 in (318 mm) gage length, 5.5 in (140 mm) width and approximately 9 in (229 mm) height.
Both are -20 Vertical Carrier configurations for 3/8–2 in (10–50 mm) diameter parts. The H-20 is a Standard Shaft Gage with up to 12 in (305 mm) published part-length capacity, while the G2-20 Side Checker is published for part lengths up to 6 in (152 mm).
Both serve the 3/8–2 in (10–50 mm) diameter class. H-20 accommodates parts up to 12 in (305 mm) long, while HL-20 extends the published length capacity to 24 in (610 mm).
Yes. Current Universal Punch parts documentation identifies dedicated H/HL Full Plain Short Roller Sets, including Part No. 120-20HS for the H-20 size class.
Current parts documentation lists Part No. 120-20HS as the Full Plain Short Roller Set for the H-20 size class, with approximately 0.8 in (22 mm) roller length.
Current Universal Punch parts documentation identifies Part No. 170-20, 3/4 × 9/32 in (19 × 7 mm), as the standard top roller for -20 models.
Current Universal Punch documentation publishes Standard Black at better than or equal to 4 microns (0.00016 in). Precision Gold is published for -10 and -20 model classes at better than or equal to 2 microns (0.000079 in); the final ordered H-20 configuration and calibration package should be confirmed when quoting.
Universal Punch current parts documentation states that the Concentricity Gaging System classifications are calibrated and directly traceable to NIST.
Yes. Current Universal Punch parts documentation includes analog and digital test indicators together with multiple mounts, swivel supports and H/HL carrier accessories.
Yes. Current parts documentation lists the H-20 Variable Speed Motor Assembly, Part No. 274-20, with a 17 in (432 mm) base plate.
The current Universal Punch variable-speed drive architecture is documented at 24 VDC with a 0–10 rpm range and forward/reverse control.
Send the part drawing, shaft diameter, overall length, support journal diameters and widths, nearby shoulders or splines, feature being measured, measurement direction, tolerance, required indicator resolution, calibration requirements and whether manual or motorized rotation is preferred.
Configure the H-20 Around the Actual Shaft
The shaft drawing—not the model number alone—determines the final inspection system.
Send Universal Punch the part drawing, shaft diameter, overall length, support journal diameters and widths,
nearby shoulders, splines, grooves or threads, feature being measured, measurement direction, tolerance,
required indicator resolution, calibration requirements, production or inspection volume, and whether manual or motorized rotation is preferred.
