Starrett 120 Series Dial Slide Calipers for Accurate Measurement with Fitted Plastic Case and SLC – White Face, 0-150mm Range, 0.02mm Graduations – 120AM-150 W/SLC

Price: $300.99
(as of May 10, 2024 22:01:32 UTC – Details)


The Starrett 120AM-150 dial caliper measures 0 to 150 mm with 0.02 mm accuracy, and comes with a mail-in card to request the standard letter of certification (SLC). Once the card has been mailed in, Starrett sends the SLC with caliper model and serial numbers, ensuring that the exact caliper purchased has met National Institute of Standards and Technology master standards. 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 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 the 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.
Is Discontinued By Manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 9.7 x 3.4 x 1 inches; 8.8 ounces
Item model number ‏ : ‎ 120AM-150 W/SLC
Date First Available ‏ : ‎ July 30, 2010
Manufacturer ‏ : ‎ Starrett
ASIN ‏ : ‎ B000VDXJ18

Get The Job Done Right – This dial has a positive split-gear anti-backlash control, knife-edge contacts for both inside and outside measurements, one hand use with the thumb-operated, fine adjustment roll, direct reading, reliable and accurate graduations
Made From Robust Materials – This Dial indicator is made of hardened stainless steel bar, measuring surfaces, rack, gears, and depth rod; has lock screw for dial bezel and lock screw for holding sliding jaw in position.
Wide Range Of Selection – It offers a variety of each of the major classes; mechanical dial, electronic display, lever style test and back plunger. Each type has its own unique strengths.
Made For You – It offers everything you need, including a broad line of each indicator type, an extensive range of accessories to configure and position the gage, and as needed, an indicator-based, custom engineered solution.
The Finest Quality Available – Starrett indicators and gages have been the go-to choice for precision measurement for over a century. Our tools are carefully crafted to provide the most accurate readings possible.