FYOU PMEC, provides Internal Flush (I.F.) Plain Taper Ring and Plug Gages per API specification 7-2 for sizes from 2 to 6-5/8 inches in diameter. All working gages are manufactured and certified using a certified API reference master gage as required by the standard
| API SPEC7-2 INTERNAL FLUSH（I.F）PLAIN TAPER RING &PLUG GAGES | |||||
| SIZE | T.P.I | T.P.F | THD FORM | TAPER | ANGLE |
| 2 7/8 FH | 5 | 3 | V-0.040 | 1:4 | 60° |
| 3 1/2 FH | 5 | 3 | V-0.040 | 1:4 | |
| 4 FH (NC40) | 4 | 2 | V-0.065 | 1:6 | |
| 4 1/2 FH | 5 | 3 | V-0.040 | 1:4 | |
| 5 1/2 FH | 4 | 2 | V-0.050 | 1:6 | |
| 6 5/8 FH | 4 | 2 | V-0.050 | 1:6 | |
| 2 IF | 4 | 2 | V-0.065 | 1:6 | |
| 2 3/8 IF(NC26) | 4 | 2 | V-0.065 | 1:6 | |
| 2 7/8 IF(NC31) | 4 | 2 | V-0.065 | 1:6 | |
| 3 1/2 IF(NC38) | 4 | 2 | V-0.065 | 1:6 | |
| 4 IF(NC46)(4 1/2 XH) | 4 | 2 | V-0.065 | 1:6 | |
| 4 1/2 IF(NC50)(5 XH) | 4 | 2 | V-0.065 | 1:6 | |
| 5 1/2 IF | 4 | 2 | V-0.065 | 1:6 | |
| 6 5/8 IF | 4 | 2 | V-0.065 | 1:6 | |
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