Details
The gauge uses three progressive outer diameter (OD) steps to quickly classify whether the pipe's internal diameter is too small, perfect (within tolerance), or too large.
For 12 mm OD Pipe
Step 1 10.5 mm Go (Minimum Limit) Must enter the pipe. If it does not fit, the pipe ID is too small (under-sized) and fails inspection.
Step 2 10.7 mm Go (Target/Max Limit) Should enter the pipe smoothly. This verifies the pipe meets the standard operational size or optimal clearance limit.
Step 3 > 10.75 mm No-Go (Reject Limit) Must NOT enter the pipe. If this step slips into the pipe, the pipe ID is too large (over-sized) and fails inspection.
For 16 mm OD Pipe
Step 1 14.2 mm Go (Minimum Limit) Must enter the pipe. If it does not fit, the pipe ID is too small (under-sized) and fails inspection.
Step 2 14.4 mm Go (Target/Max Limit) Should enter the pipe smoothly. This verifies the pipe meets the standard operational size or optimal clearance limit.
Step 3 > 14.45 mm No-Go (Reject Limit) Must NOT enter the pipe. If this step slips into the pipe, the pipe ID is too large (over-sized) and fails inspection.
For 20 mm OD Pipe
Step 1 18.0 mm Go (Minimum Limit) Must enter the pipe. If it does not fit, the pipe ID is too small (under-sized) and fails inspection.
Step 2 18.2 mm Go (Target/Max Limit) Should enter the pipe smoothly. This verifies the pipe meets the standard operational size or optimal clearance limit.
Step 3 > 18.25 mm No-Go (Reject Limit) Must NOT enter the pipe. If this step slips into the pipe, the pipe ID is too large (over-sized) and fails inspection.
For 25 mm OD Pipe
Step 1 22.6 mm Go (Minimum Limit) Must enter the pipe. If it does not fit, the pipe ID is too small (under-sized) and fails inspection.
Step 2 22.8 mm Go (Target/Max Limit) Should enter the pipe smoothly. This verifies the pipe meets the standard operational size or optimal clearance limit.
Step 3 > 22.85 mm No-Go (Reject Limit) Must NOT enter the pipe. If this step slips into the pipe, the pipe ID is too large (over-sized) and fails inspection.