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Starrett 27 Series Inside Joint Caliper, Steel, Flat Leg

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Product Specifications
Manufacturer Series Number
27 Series
Specific Uses For Product
Inside
Item Shape
Flat
Material Type
Steel
Style Name
Inside
Brand Name
Starrett
System of Measurement
Inch/Metric

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Key Features

  • Joint design allows for tension adjustment
  • Tension does not change with leg movement
  • Legs made from high-grade steel for ruggedness
  • Caliper opens to approximately 1/3 greater than leg size
  • Curved tips transfer the measurement of the internal size of an object

Product Description

The Starrett 27-12 improved firm-joint inside caliper has a leg length of 12” (300 mm) but opens to approximately one-third larger than the leg length. The joint allows for tension adjustment, while the tension will not change if the legs move. The legs are made from a high-grade steel and are ruggedly constructed and well-finished.

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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