The BI-POINT™ Internal Thread Gage is a widely adjustable thread measuring instrument. Only two frame sizes are required to measure from #10 (M5) through 5″ (M125). One goes from # 10 through 2½” and the other from 2⅝” through 5″. The measurement resolution is .0001″. It can be used bench mounted or hand held.
A specific set of gaging fingers is required for each thread size. The BI-POINT™ Gage can be changed from one thread size to another in less than three minutes. The following gaging fingers are available:
ANSI/ASME Gage #
Pitch Diameter (per size)
Minor Diameter (per size)
“VARIMINOR” (.190″-2.5″ adjustable)
Runout (P.D. to minor)
Lead and Flank Angle
The BI-POINT™ Gage meets all of the requirements of ANSI/ASME B 1.3M, MIL-S-7742, and MIL-S-8879.
The BI-POINT™ Gage is set using a solid threaded master ring gage. The master ring has three certified sizes on it: pitch diameter, functional diameter, and minor diameter. The gaging fingers must be set to the corresponding master ring certified size. The result of a long form Gage Repeatability and Reproducibility Study for the BI-POINT™ Gage was 13% with the pitch diameter gaging fingers and 15% with the functional diameter gaging fingers.