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Starrett 120M Series Dial Caliper, Stainless Steel, Metric, For Inside/Outside Measurements

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Product Specifications
Manufacturer Series Number
120M Series
Specific Uses For Product
Inside , Outside
Tip Description
Standard
Material Type
Stainless Steel
UNSPSC Code
41111600
Brand Name
Starrett
System of Measurement
Metric

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0-150mm   0.02mm White 1.5" Thumb roller, fine-adjustment, anti-backlash control, redemption card for Standard Letter of Certification 120AM-150 W/SLC B000VDXJ18 2 $207.01 Buy Options
0-150mm +/-0.03mm 0.02mm Yellow 1.5" Thumb roller, fine-adjustment, anti-backlash control 120MX-150 B003XU78NG 1 $303.00 Buy Options
0-150mm +/-0.03mm 0.02mm Yellow 1.5" Thumb roller, fine-adjustment, anti-backlash control 120AM-150 B000FMX3PM 3 $207.00 Buy Options
0-225mm +/-0.03mm 0.02mm Yellow 1.5" Thumb roller, fine-adjustment, anti-backlash control 120MZ-225 B001B0TG76 1 $352.00 Buy Options
0-225mm +/-0.03mm 0.02mm Yellow 1.5" Thumb roller, fine-adjustment, anti-backlash control 120M-225 B000VDXJ1S 1 $310.00 Buy Options
0-300mm +/-0.03mm 0.02mm Yellow 2.5" Thumb roller, fine-adjustment, anti-backlash control 120M-300 B001B0SKW8 1 $370.00 Buy Options
0-300mm +/-0.03mm 0.02mm Yellow 2.5" Thumb roller, fine-adjustment, anti-backlash control 120MZ-300 B000VDTHL4 2 $413.00 Buy Options
0-300mm +/-0.03mm 0.02mm Yellow 2.5" Thumb roller, fine-adjustment, anti-backlash control, redemption card for Standard Letter of Certification 120MZ-300 W/SLC B003XU78NQ 1 $453.00 Buy Options
0-300mm +/-0.03mm 0.02mm Yellow 2.5" Thumb roller, fine-adjustment, anti-backlash control, redemption card for Standard Letter of Certification 120M-300 W/SLC B003XU78MW 1 $410.00 Buy Options

Key Features

  • Precise dial graduations of 0.02 mm, with one revolution equivalent to 2 mm
  • Thumb-operated fine adjustment roll for one-hand use
  • Lock screw holds the sliding jaw in position, to ensure a consistent measurement
  • Rack teeth point down to keep foreign matter from clogging the gear, to help prevent measurement error
  • Knife-edge contacts for inside and outside measurements

Product Description

The Starrett 120AM-150 dial caliper measures 0 to 150 mm with 0.02 mm accuracy. This handy measuring tool allows for reliable and accurate readings with the sharp, black graduations on the no-glare, satin-finished bar, crisp lines on the yellow dial face, and knife edge contacts for inside and outside measurements.

One full revolution of the dial is equivalent to 2 mm. The jaw depths on this caliper are approximately 1-1/2” or 38 mm for the outside measuring jaws and 5/8" or 16 mm on the inside measuring jaws. The jaw depths on this caliper are approximately 1-1/2” or 38 mm for the outside measuring jaws and 5/8" or 16 mm on the inside measuring jaws. The knife-edge contacts can be used to scribe parallel lines on the workpiece. This caliper can be used with one hand through operating the fine adjustment roll with the thumb. The lock screw locks the dial bezel and holds the sliding jaw in position. The depth rod is integrated into the rack of the caliper, unlike many calipers which offer a detachable depth rod, or none at all. The hardened stainless steel components, including the bar, measuring surfaces, rack, gears, and depth rod, offer corrosion resistance, increased accuracy, and long life. Positive split gear anti-backlash control offers increased accuracy over standard gear configurations. Backlash is the amount of clearance between mated gear teeth in the caliper controls, which prevents the gear teeth from jamming. It is undesirable to have much backlash due to the lack of precision offered by the increased amount of play between gears. Certain gear designs can minimize or eliminate backlash; split gear systems actually split the gear into two gears, each half as thick as the original gear. One of these gears is then fixed to the shaft while the other gear is allowed to turn. The free-turning gear is connected to coil springs that rotate it until all the backlash in the control system has been eliminated. The rack teeth point down to keep foreign matter from clogging the gear operations. This prevents measurement errors where metal chips could interfere with proper caliper operation.

Calipers measure the distance between two opposing sides of an object. They make inside, outside, depth, or step measurements, according to their type. Calipers are commonly used in architecture, metalworking, mechanical engineering, machining, manufacturing, carpentry, and medicine. The simplest calipers have two legs to mark the two points and require a ruler to take the measurement. More complex calipers use two sets of jaws instead of legs and have up to two graduated scales. Vernier, dial, and digital calipers give direct and accurate readings and are functionally identical, having a calibrated scale with a fixed jaw, and another jaw with a movable pointer that slides along the scale. The vernier caliper has a scale sliding parallel to the main scale for an additional, fractional reading to improve measurement precision. The dial caliper has a circular dial with a pointer on a toothed gear rack replacing the second vernier scale. As with the vernier, this second measurement is added to the reading from the main scale to obtain the result. The dial caliper is used also for measuring size differential between two objects. The digital caliper takes the same sort of differential measurements as the dial caliper by zeroing the display at any point along the slide, with an LCD (replacing the dial) that displays a single, easily read value in both English and metric units. Some digital calipers can hold data readings between measurements and send them to data collection devices.

The L. S. Starrett Company was founded in 1880, originally manufacturing bench vises, squares, and other tools. They acquired other companies throughout the years, expanding their services into making precision measurement instruments and tools, such as calipers, micrometers, saw blades, and gauges. Starrett is headquartered in Athol, Massachusetts and has manufacturing facilities in Brazil, the United Kingdom, China, and other locations.

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