Internal Flush (I.F)

Internal Flush (I.F)

Northern gauge manufactures API Internal Flush (I.F.) working, reference and regional master 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.

INTERNAL FLUSH (I.F.)
SIZE T.P.I. T.P.F. THD FORM
2 4 2 V-0.065
2-3/8 (NC26) 4 2 V-0.065
2-7/8 (NC31) 4 2 V-0.065
3-1/2 (NC38) 4 2 V-0.065
4 (NC46) (4-1/2 XH) 4 2 V-0.065
4-1/2 (NC50) (5 XH) 4 2 V-0.065
5-1/2 4 2 V-0.065
6-5/8 4 2 V-0.065