HL-20 Extended Shaft Concentricity Gage
Precision concentricity and runout inspection for shafts up to 24 inches long.
The Universal Punch HL-20 is an Extended Shaft Concentricity Gage with a Vertical Carrier for long cylindrical components from 3/8–2 in (10–50 mm) in diameter and up to 24 in (610 mm) long.
Its extended base and H/HL support architecture provide the inspection envelope needed for longer shafts while preserving configurable indicator positioning over the feature being measured.
The -20 platform for exceptionally long shafts.
HL identifies Universal Punch's Extended Shaft Gage architecture. -20 identifies the 3/8–2 in / 10–50 mm diameter class.
The HL-20 is intended for parts that fit the -20 diameter envelope but require substantially more axial inspection capacity than standard short-part or standard-shaft configurations.
When shaft length becomes the defining requirement.
The HL-20 doubles the published maximum shaft-length capacity of the H-20 while remaining in the same 3/8–2 in diameter class.
Long shafts change the inspection problem.
Extended cylindrical components require more than additional base length. Stable rotational inspection depends on the actual geometry of the shaft and the relationship between support surfaces and the feature being checked.
Capacity built around 24-inch shafts.
| Specification | HL-20 Published Data |
|---|---|
| Model | HL-20 |
| Gage Type | Extended Shaft Gage |
| Carrier | Vertical Carrier |
| Part Diameter | 0.37–2 in / 10–50 mm |
| Part Length | 0.18–24 in / 4.7–610 mm |
| Gage Length | 24.5 in / 622 mm |
| Gage Width | 5.5 in / 140 mm |
| Gage Height | Approx. 9 in / 229 mm |
| Shipping Weight | 26.5 lb / 12 kg |
Configure the support geometry around the actual shaft.
Universal Punch publishes dedicated H/HL shaft-support hardware and a dedicated 120-20HS Full Plain Short Roller Set for the -20 H-family size class. The published short roller length is 0.8 in / 22 mm.
Support selection should be based on the usable journals and surrounding component geometry rather than nominal diameter alone.
- support-journal diameter and width
- shoulder and flange clearance
- splines, threads, grooves and tapers
- shaft stiffness and overhang
- distance between support points
- location of the feature being inspected
Put the measurement probe where the print requires it.
The HL-20 uses a Vertical Carrier to position the indicator above the supported shaft. Universal Punch publishes multiple analog and digital indicators along with dovetail mounts, swivel supports, extension holders and precision fine-adjustment accessories.
Specify the accuracy required by the inspection plan.
Universal Punch publishes Standard Black and Precision Gold Concentricity Gaging System classifications and states that its systems are calibrated and directly traceable to N.I.S.T.
For an HL-20 order, confirm the required accuracy classification, indicator resolution and calibration documentation during quoting.
Controlled rotation for extended-shaft inspection.
Manual Timing-Belt Drive
Universal Punch documentation describes a manual Drive Timing Belt Pulley System that provides smooth component rotation during inspection. H/HL-specific -20 timing belt sets are also published.
HL-20 Variable Speed Motor Assembly
29 in / 737 mm base plate
Published motorized system: 24 VDC · 0–10 rpm · variable speed · forward/reverse.
Universal Punch also publishes an international 110/220 VAC transformer for the 24 VDC system and an industrial foot-switch option.
Ask About Motorizing the HL-20 →Choose the architecture from the part geometry.
HL-20 vs. H-20
| Feature | H-20 | HL-20 |
|---|---|---|
| Diameter | 3/8–2 in / 10–50 mm | 3/8–2 in / 10–50 mm |
| Maximum Part Length | 12 in / 305 mm | 24 in / 610 mm |
| Carrier | Vertical Carrier | Vertical Carrier |
| Architecture | Standard Shaft Gage | Extended Shaft Gage |
| Published Shipping Weight | 8.5 lb / 3.9 kg | 26.5 lb / 12 kg |
HL-20 vs. G2-20
Side Checker Gage
3/8–2 in / 10–50 mm
Vertical Carrier · up to 6 in / 152 mm part length.
View G2-20 →Extended Shaft Gage
3/8–2 in / 10–50 mm
Vertical Carrier · up to 24 in / 610 mm part length.
HL Series Comparison
| Model | Part Diameter | Maximum Length | Published Shipping Weight |
|---|---|---|---|
| HL-10 | 1/8–1 in / 3–25 mm | 24 in / 610 mm | 24.5 lb / 11.1 kg |
| HL-20 | 3/8–2 in / 10–50 mm | 24 in / 610 mm | 26.5 lb / 12 kg |
| HL-40 | 3/4–4 in / 20–102 mm | 24 in / 610 mm | 29.5 lb / 13.5 kg |
Configure the system in three engineering decisions.
Universal Punch describes its Concentricity Gaging System as three main components: select the gage model, select the main rollers, then select the indicator(s) and accessories.
Common engineering questions about the HL-20.
What is the Universal Punch HL-20?
The Universal Punch HL-20 is an Extended Shaft Concentricity Gage with a Vertical Carrier for cylindrical shafts from 3/8–2 in (10–50 mm) in diameter and up to 24 in (610 mm) long.
What is the maximum shaft length for the HL-20?
The published maximum part length is 24 in (610 mm).
What diameter range does the HL-20 handle?
The published HL-20 diameter range is 3/8–2 in (10–50 mm).
What is the difference between the H-20 and HL-20?
Both serve the 3/8–2 in diameter class and use Vertical Carrier architecture. The H-20 supports shafts up to 12 in long, while the HL-20 extends the published maximum shaft length to 24 in.
What is the difference between the G2-20 and HL-20?
The G2-20 is a Side Checker Gage for parts up to 6 in long. The HL-20 is an Extended Shaft Gage for shafts up to 24 in long.
How much does the HL-20 weigh?
Published shipping weight is 26.5 lb (12 kg).
Can the HL-20 use digital indicators?
Yes. Universal Punch publishes multiple analog and digital test indicator options along with indicator mounts, swivel supports, extensions and fine-adjustment accessories.
What accuracy classifications are available for the HL-20 model class?
Universal Punch publishes Standard Black at better than or equal to 4 microns and states that Precision Gold at better than or equal to 2 microns is available for -10 and -20 model classes. The exact ordered configuration should be confirmed when quoting.
Is the HL-20 NIST traceable?
Universal Punch documentation states that its Concentricity Gaging Systems are calibrated and directly traceable to N.I.S.T.
Can the HL-20 be motorized?
Yes. Universal Punch publishes the 275-20 HL-20 Variable Speed Motor Assembly with a 29 in (737 mm) base plate.
What speed does the motorized HL-20 operate at?
The published variable-speed system is 24 VDC, 0–10 rpm, with forward and reverse control.
Send the print. We’ll help define the gaging configuration.
For an HL-20 application, Universal Punch can use the actual shaft geometry and measurement requirement to help determine support arrangement, carrier position, indicator system, accessories and manual or motorized rotation.
- part drawing or CAD print
- overall shaft length
- maximum diameter
- support-journal diameters
- usable support widths
- distance between supports
- shoulders and flanges
- splines, grooves and threads
- inspection feature
- datum relationship
- tolerance and required resolution
- manual or motorized preference