Machinery's Handbook, 31st Edition
780
TUBULAR INSIDE MICROMETERs Table 6. Type II, Class 3, Style B, Inside Tubular Fixed Micrometer Head Inch
Tolerance
Range of Micrometer Head (inch)
Range (inch) 2 to 2 2 to 3 3 to 3 3 to 4 4 to 4 4 to 5
Micrometer Head (inch)
Length Rods (inch)
0 to 0.500 0 to 0.500 0 to 0.500 0 to 0.500 0 to 0.500 0 to 0.500 0 to 1.000
0.0002 0.0002 0.0002 0.0002 0.0002 0.0002 0.0002
0.0003 0.0003 0.0003 0.0003 0.0003 0.0003 0.0004
5 to 12 (1 inch increments)
Metric
Tolerance
Range of Micrometer Head (mm)
Range (mm) 50 to 63 63 to 75 75 to 88
Micrometer Head (mm)
Length Rods (mm)
0 to 13 0 to 13 0 to 13 0 to 13 0 to 13 0 to 13 0 to 25
0.005 0.005 0.005 0.005 0.005 0.005 0.005
0.007 0.007 0.007 0.007 0.007 0.007 0.010
88 to 100 100 to 113 113 to 125
125 to 300 (25mm increments)
Type III, Micrometer Depth Gage.— The Type III micrometer depth gage shall be sim ilar in design and function to Fig. 16 below. The Type III depth micrometer consists of a micrometer head, base and interchangeable depth rods. The unit shall be further provided with a ratchet or friction thimble, a clamp ring, spindle lock nut or lever-type spindle lock.
5
0 2
20 0
Fig. 16. Type III: Micrometer Depth Gage Micrometer Head: The micrometer head shall be provided in a measuring range of 0–1.000 inch or 0–25 mm. The resolution of the instrument shall be 0.001 inch / 0.01 mm, 0.0001 inch / 0.002 mm (with vernier scale) or 0.00005 inch / 0.001 mm (units equipped
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