Internal Variable Gages
Bi-Point™ Gage
The BI-POINT™ Internal Thread Gage is a widely adjustable thread measuring instrument with three frame sizes required to measure from #10 through 2-1/2″, from 2-5/8″ through 5″ and from 5-1/8″ through 8″. 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:
| Thread Characteristic | ANSI/ASME Gage # |
| Functional Diameter | 4.1 |
| Pitch Diameter (per size) | 4.5 |
| Minor Diameter (per size) | 5.2 |
| “VARIMINOR” (.190″-2.5″ adjustable) | 5.2 Variable |
| Runout (P.D. to minor) | 4.7 |
| Lead and Flank Angle | 4.8 |
The BI-POINT™ Gage meets all of the requirements of ANSI/ASME B 1.3, SAE AS8879
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.
