Starrett - Inside Micrometers

These sets of inside micrometers are ideal for a wide range of precision inside measurements in aircraft, metalworking, and other industries.

Each set consists of a satin-chrome micrometer head which can be used in combination with any one or more of a series of rigid, tubular steel measuring rods to obtain the required length.

The micrometer head is a modification of our No. 63, which has a 2" (50 mm) range. The head has a basic length of 4" (100 mm) which can be lengthened to 6" (150 mm) by means of its measuring range.

• For inside measurements from 6-294" (150-7350 mm) (longer sizes are also available on special order)
• Interchangeable tubular steel measuring rods and extension rods are lightweight with extreme rigidity. Rods screw into each other and seat against hardened ground and lapped surfaces necessary for high accuracy. Rod diameter 5/8" (16 mm)
• Rods are provided with insulated handles to minimize expansion from hand heat. All rods marked with length
• All rod anvil contacts are hardened and ground
• All measuring rod anvil contacts are adjustable (plain extension rods are not adjustable)
• Adjustable, ground steel supporting collars (placed in "V" grooves when used in the horizontal position)

Inside Micrometers
No. 128 Series Sets - Range: 6-294"
No. 128M Series Sets - Range: 150-7350mm

J.W. Donchin Co.
Ph: 773-261-2182 • Fax: 773-261-2867 • Email: sales@jwdonchin.com