Vermont Thread Gage

(A2LA Cert. No. 3821.01) 06/06/2025 Page 2 of 3 Parameter/Equipment Range CMC2, 3 (±) Comments Tapered Thread Plug – Major Diameter Simple Pitch Diameter Taper Lead Flank Angle Up to 12 in Up to 12 in Up to 12 in Up to 12 in 180° (97 + 7L) µin (76 + 6L) µin (110 + 9L) µin 130 µin 4.3´ 6´ Mikrokator, gage blocks, taper blocks Mikrokator, gage blocks, 3-wire method PD measurements Zeiss Contourecord Zeiss Contourecord Optical comparator Tapered Thread Ring – Pitch Diameter Standoff Minor Diameter Up to 12 in Up to 12 in Up to 12 in (210 + 17L) µin (0.0034 + 0.000 28L) in (140 + 9L) µin Master plugs Tapered Plain Plug – Major Diameter Taper Up to 12 in Up to 12 in (110 + 6L) µin (150 + 9L) µin Mikrokator, gage blocks, taper blocks OD measurements Tapered Plain Ring – Minor Diameter Taper Up to 12 in Up to 12 in (140 + 7L) µin (330 + 1L) µin Master plug Zeiss Contourecord

(A2LA Cert. No. 3821.01) 06/06/2025 Page 3 of 3 Parameter/Equipment Range CMC2, 3 (±) Comments Hex, Square, and Rectangular Plugs – Across Flats Across Corners Up to 0.0999 in (0.1000 to 3) in Up to 0.0999 in (0.1000 to 3) in 51 µin (37 + 5L) µin 98 µin (50 + 3L) µin Mikrokator, gage blocks Length – Gage and Step Height Up to 4 in (120 + 8L) µin Gage blocks, indicator w/ stand ________________________________ 1 This laboratory offers commercial calibration service. 2 Calibration and Measurement Capability Uncertainty (CMC) is the smallest uncertainty of measurement that a laboratory can achieve within its scope of accreditation when performing more or less routine calibrations of nearly ideal measurement standards or nearly ideal measuring equipment. CMC’ s represent expanded uncertainties expressed at approximately the 95 % level of confidence, usually using a coverage factor of k = 2. The actual measurement uncertainty of a specific calibration performed by the laboratory may be greater than the CMC due to the behavior of the customer’s device and to influences from the circumstances of the specific calibration. 3 In the statement of CMC, L is the numerical value of the nominal length of the device measured in inches. 4 This scope meets A2LA’s P112 Flexible Scope Policy.