SPI Hole-Mike, 3.2 - 3.6" - 10-745-8

Three point internal mikes for precise direct measurement of bore diameters.
Self aligning and self centering.
Carbide measuring anvils.
Suitable to measure to within .050" of bottom of blind hole, up to 4" capacity.
Feelers taper toward the back for positive reading of the front edge.
Ratchet stop provides uniform measuring pressure and assures highest reading accuracy.
In lieu of Setting Rings, Setting Frames are provided for diameter ranges above 4" dia.
Hole - Mike accuracy: 1.6" 4" ± .00012", 4" 8" ± .0002", 8" 12" ± .0004"
Setting Ring accuracy: 2" ± .0001", 2.8 & 3.6" ± .0002", 5 & 7" ± .0003", 9 & 11" ±.0005"

Specifications:

Type:	Mechanical Micrometer
Minimum Measuring Range (Decimal Inch):	3.2000"
Maximum Measuring Range (Decimal Inch):	3.6000"
Graduation (Decimal Inch):	.0002"
Accuracy (Decimal Inch):	.00025"
SPI Part Number:	10-745-8

Hole Mike