Calibrated No.4 x 48TPI UNF Go/No-Go Left Hand Thread Plug Gauge 2B (JBO)
Premium German made UNF Left Hand Go/No-Go Thread Plug Gauge. For checking to a 2B tolerance. These JBO gauges are supplied with Level 1 calibration certificates which include a simple pitch diameter determined on one level. For UKAS Calibration please enquire.