Turned Shafts
Evaluate rotational accuracy on medium-diameter cylindrical parts.
Universal Concentricity Gaging System
Model B-20
B-20
Concentricity Gage
Medium-diameter rotational inspection with more working envelope.
The Universal Punch B-20 supports cylindrical parts from 3/8 in to 2 in (10–50 mm) in diameter and up to 6 in (152 mm) long.
Universal Punch B-20 · Medium-diameter concentricity inspection platform
3/8 in – 2 in
Published part diameter
Up to 6 in
Published part length
B-20
Medium-diameter platform
Why B-20
Built for the point where small-part gaging needs more room.
The B-20 is the next step beyond the B-10 for cylindrical parts that require a larger published diameter range, additional part length, or a more comfortable medium-diameter inspection envelope.
The platform retains the Universal Punch concentricity-gaging architecture: precision roller support, an adjustable top-arm yoke, a fine-adjustment indicator carrier, and controlled manual rotation through the timing-belt drive system.
01
Larger Published Envelope
3/8 in–2 in diameter
Up to 6 in part length
Up to 6 in part length
02
Controlled Rotation
Manual timing-belt drive
Smooth inspection workflow
Smooth inspection workflow
03
Adjustable Measurement
Fine-adjustment carrier
Position along the carrier rod
Position along the carrier rod
04
Application Review
Roller-family selection
Configure from the actual part print
Configure from the actual part print
Published B-20 envelope
Technical dimensions, without the clutter.
Use these published B-20 dimensions as the starting point for model selection. Final roller support, indicator access, and setup should be matched to the actual part and inspection requirement.
Part diameter range
3/8–2 in
10–50 mm
Maximum part length
Up to 6 in
152 mm
Gage length
12.5 in
318 mm
Gage width
4.5 in
114 mm
Shipping weight
6.4 lb
2.9 kg
Top-arm yoke
Adjustable multi-position clamping system
Indicator carrier
Fine-adjustment carrier system
Standard drive
Manual timing-belt pulley rotation
Carrier positioning
Adjustable along the carrier rod assembly
Engineered rotational inspection
The Universal system is built around four controllable elements.
Rather than treating the gage as a generic bench fixture, the B-20 combines support, stabilization, indicator positioning, and controlled rotation into one modular inspection platform.
01
Precision Roller Support
Selected around diameter, geometry, and measurement access.
02
Adjustable Top-Arm Yoke
Stabilizes the part while preserving inspection access.
03
Fine-Adjustment Carrier
Positions the indicator at the required measurement location.
04
Timing-Belt Rotation
Provides smooth manual part rotation through the inspection cycle.
01Precision Roller SupportConfigure support around the part.
02Adjustable Top-Arm YokeStabilize the part for inspection.
03Fine-Adjustment CarrierPosition the indicator precisely.
04Timing-Belt RotationRotate the part smoothly.
01
Precision Roller Support
Support the part on the roller family selected for its diameter, geometry, and measurement access.
02
Adjustable Top-Arm Yoke
Position the multi-position top-arm yoke to stabilize the part during rotational inspection.
03
Fine-Adjustment Indicator Carrier
Move the carrier to the measurement location, position the indicator, and establish the reference reading.
04
Manual Timing-Belt Rotation
Rotate the part smoothly through the timing-belt drive and observe indicator variation through the inspection cycle.
Roller configuration
Support geometry is part of the measurement strategy.
Universal Punch publishes multiple main-roller families. The correct roller geometry depends on the actual support surface, adjacent features, and where the indicator must contact the part.
120FP
Full Plain Rollers
Broad cylindrical support for the medium-size roller family.
120HP
Half Plain Rollers
Reduced roller width where additional clearance near a feature is helpful.
120QP
Quarter Plain Rollers
Narrower support geometry for localized contact and measurement access.
CUSTOM
Special Main Rollers
Application-specific roller geometry when a standard configuration does not fit the part.
If the part has a shoulder, thread, reduced support land, interrupted surface, or restricted indicator access, send the print to Universal Punch before choosing the roller set.
Confirm My Roller Setup
Configuration & support
A gage is only as useful as the setup around the part.
Universal Punch can review the inspection task and help determine the appropriate B-20 configuration, roller support, indicator arrangement, accessories, and service requirements.
01
Additional roller sets
02
Indicator upgrades
03
Calibration standards
04
Custom fixtures
05
Engineering review of your print
Applications
Where the B-20 fits.
The B-20 is intended for repeatable rotational inspection of medium-diameter cylindrical components. Application fit depends on the support surface, feature being checked, measurement location, and part envelope.
Ground Spindles
Verify repeatable runout and concentricity on precision ground components.
Fasteners & Specials
Inspect larger fasteners, specials, and formed components.
Incoming Inspection
Compare suppliers, lots, and setups with repeatable variable readings.
Production QA
Use at the bench or in quality for fast in-process verification.
Custom Programs
Configure rollers and accessories around the measurement task.
B-10 vs B-20
Choose the platform by the part envelope.
B-10 remains the smaller platform. B-20 is the logical step when the required diameter range and part length move beyond the B-10 envelope.
Small-diameter extended model
B-10
1/8–1 in
Diameter
Up to 4 in
Part length
Medium-diameter model
B-20
3/8–2 in
Diameter
Up to 6 in
Part length
Selection rule: move to B-20 when the part requires more diameter range, more length, or a medium-diameter working envelope that the B-10 does not provide.
B-20 FAQ
Common questions before model selection.
Use these answers as a starting point. Final suitability should be confirmed against the actual part, support geometry, measurement location, and inspection requirement.
What size parts can the B-20 inspect?
The published B-20 range is 3/8 in to 2 in (10 mm to 50 mm) in part diameter with part lengths up to 6 in (152 mm).
What are the published B-20 gage dimensions?
Universal publishes a B-20 gage length of 12.5 in (318 mm), gage width of 4.5 in (114 mm), and shipping weight of 6.4 lb (2.9 kg).
How is the B-20 different from the B-10?
The B-10 covers 1/8 in to 1 in diameter and parts up to 4 in long. The B-20 increases the published envelope to 3/8 in to 2 in diameter and parts up to 6 in long.
How does the Universal concentricity gage system rotate the part?
Universal describes a manual drive timing-belt pulley system as a standard feature across its concentricity gaging system, providing smooth controlled part rotation during inspection.
What roller options are available?
Universal publishes Full Plain, Half Plain, Quarter Plain, Zero Style, Extra Thin Zero, and special roller families. Final roller selection should be confirmed against the actual part geometry.
Can Universal Punch help configure a B-20?
Yes. Send the part print, diameter, length, support surfaces, feature being checked, and inspection objective so Universal Punch can review the application.
Is calibration or service support available?
Universal Punch supports gaging, calibration, and application review. Use the Quality or Contact sections of the site for current service and documentation information.
Application engineering
Send us the part. We’ll help configure the gage.
Send the print, diameter, length, support surfaces, feature being inspected, and any tolerance or reporting requirement. Universal Punch can help determine whether B-20 is the right platform and how it should be configured.