Description
247, 247M Series Micrometer
Ball Attachments
Inch / mm
Starrett outside micrometers and micrometer heads having
spindle sizes listed below can be instantly converted for
measuring wall thickness of tubing, split and full
bearings,
sleeves and other parts with rounded surfaces by means of
the 247 ball attachment
Features
• Easily applied by snapping on to end of either anvil or
spindle, thus permitting two attachments to be used together
• Balls are hardened, measure 200" and 5mm in diameter, and move
freely in the retainer, insuring positive contact with anvil and spindle
• The diameters, 200" or 5mm, of each ball used must be
subtracted from the micrometer reading
Ball Attachments
Inch / mm
Starrett outside micrometers and micrometer heads having
spindle sizes listed below can be instantly converted for
measuring wall thickness of tubing, split and full
bearings,
sleeves and other parts with rounded surfaces by means of
the 247 ball attachment
Features
• Easily applied by snapping on to end of either anvil or
spindle, thus permitting two attachments to be used together
• Balls are hardened, measure 200" and 5mm in diameter, and move
freely in the retainer, insuring positive contact with anvil and spindle
• The diameters, 200" or 5mm, of each ball used must be
subtracted from the micrometer reading