Dimensional
Gage Block Calibration
The ORNL Metrology Laboratory maintains a wide range of dimensional calibration and inspection capabilities. The ORNL Metrology Laboratory provides NVLAP-accredited calibrations for gauge blocks (up to 4 inches), micrometers and calipers (up to 12 inches), thread wires, ring gauges, plug gauges, and thread plug gauges. The ORNL Metrology Laboratory can also provide a wide range of non-accredited, but fully-NIST-traceable calibrations and inspection services for the following:
- Gage Blocks up to 4 inches (NVLAP-Accredited)
- Vision Measuring Machine inspections
- CMM Inspections
- Roundness
- Surface Finish
- Optical Comparator Inspections
- Length using Mahr-Federal Length Measuring Machine
- Mocrometers (NVLAP-Accredited)
- Calipers (NVLAP-Accredited)
- Height Gages
- Metal Scales
- Ring Gages (NVLAP-Accredited)
- Plug Gages (NVLAP-Accredited)
The tables below list our accredited capabilities. Our entire Scope of Accreditation can be found at the following link.
If you have questions about our dimensional and inspection capabilities, please contact the ORNL Metrology Laboratory for additional information.
NVLAP Code: 20/D03
Gage Blocks
Range in Inches |
Best Uncertainty in µ inches note 1 |
Remarks |
0 to 4 |
5.7 +1.1L |
L in inches for Steel |
0 to 4 |
5.8 + 0.6L |
L in inches for Chrome Carbide |
NVLAP Code: 20/D05
Micrometers (0 to 12 inches)
Resolution |
Best Uncertainty |
Remarks |
0.0005 inch |
44 µ inches |
comparison to gage blocks |
0.0001 inch |
85 µ inches |
comparison to gage blocks |
0.001 inch |
820 µ inches |
comparison to gage blocks |
Calipers (0 to 12 inches)
Resolution |
Best Uncertainty |
Remarks |
0.0001 inch |
85 µ inches |
comparison to gage blocks |
0.001 inch |
820 µ inches |
comparison to gage blocks |
NVLAP Code: 20/D07
Measuring Wires
Range in inches (TPI) |
Best Uncertainty |
Remarks |
0.007217 (80) to 0.144338(4) |
13 µ inches |
ulm 300 and master wires |
NVLAP Code: 20/D11
Plain Ring gauges
Range |
Best Uncertainty |
Remarks |
0.5 to 4.0 inches |
12 µ inches |
ulm 300 and master rings |
Plain Plug Gauges
Range |
Best Uncertainty |
Remarks |
0.5 to 4.0 inches |
15 µ inches |
ulm 300 and gage blocks |
NVLAP Code: 20/D14
Thread plugs up to 4 inches, 4 to 80 TPI
Parameter |
Best Uncertainty |
Remarks |
major diameter |
15 µ inches |
ulm 300 and gage blocks |
pitch diameter |
55 µ inches |
ulm 300 and thread wires |
thread pitch |
390 µ inches |
optical comparator |
flank angles |
5 arc minutes |
optical comparator and angle blocks |
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