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

Available in multiple versions

32 customer reviews

Price: $181.73 - $437.68
Sale: Lower price available on select options
Product Specifications
Brand Name Starrett
System of Measurement Inch
Material Type Stainless Steel
Manufacturer Series Number 120 Series
Specific Uses For Product Inside , Outside
Tip Description Standard
UNSPSC Code 41111600

The Starrett dial caliper has sharp black graduations every 0.100" on the ... Read full product description

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Range Resolution Measurement Accuracy Part Number Part Number
The Amazon Standard Item Number (ASIN) uniquely identifies the item in the Amazon catalog.
Price Quantity
0-12" 0.001" +/-0.001" 120Z-12 B0002FUMMO
0-12" 0.001" +/-0.001" 120Z-12 W/SLC B001B0QE6W
0-12" 0.001" +/-0.001" 120-12 B001B0TG58
0-12" 0.001" +/-0.001" 120-12 W/SLC B001B0VH32
0-6" 0.001" +/-0.001" 120A-6 B00002254I
0-6" 0.001" +/-0.001" B120A-6 B0002FUMN8
0-6" 0.001" +/-0.001" R120A-6 B0002FUMNI
0-6" 0.001" +/-0.001" 120X-6 B000E62LVG
0-6" 0.001" +/-0.001" 120A-6 W/SLC B002JGSE74
0-9" 0.001" +/-0.001" 120AZ-9 B0002FUMO2
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Product Features

  • Precise dial graduations of 0.001", with one revolution equivalent to 0.100"
  • Thumb-operated fine adjustment roll for one-handed 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
  • Knife-edge contacts for inside and outside measurements

Special Offers and Product Promotions

Product Details

  • Shipping Information: View shipping rates and policies
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B009UX5WDI
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (32 customer reviews)
  • Product Warranty: For warranty information about this product, please click here

Product Description

The Starrett dial caliper has sharp black graduations every 0.100" on the no-glare, satin-finished stainless steel bar, and graduations on the dial every 0.001". One full revolution of the dial is equivalent to 0.100". These calipers have knife-edge contacts for measuring both inside dimensions (ID) and outside dimensions (OD). 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 of 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, and machining. 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 digital caliper takes a differential by zeroing the display at any point along the slide, with an LCD that displays a single value in English and/or metric units.

The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company was founded in 1880 and is headquartered in Athol, MA.

Customer Reviews

Most Helpful Customer Reviews

54 of 57 people found the following review helpful By Kevin Bentz on January 24, 2001
Part Number: 120A-6Measurement Accuracy: +/-0.001"Resolution: 0.001"Range: 0-6"
One of the reviewers referred to this caliper as being "heirloom quality". I feel that statement needs a bit of qualifying.
Starrett has recently (within the past couple of years) made some changes to this caliper. I'll let you be the judge as to whether it was a good move. I should preface this by saying that I own several Starrett tools and have plans to add more to my chest (my wallet permitting).
The first change that I'll speak to is with the dial housing. It has gone from being made from metal to plastic. I spoke w/a tech rep at Starrett who told me that It was a cost cutting measure as well as an attempt to make all the dials in their product line universal. He also said that he has fielded several customer complaints regarding this change. I have both versions of this caliper and the one with the plastic dial does not meet my expectations of "heirloom quality". It is a fine caliper but the plastic on this instrument detracts from the reputation for quality that Starrett has developed. However, the metal dial version of this tool, IMHO, embodies the qualities that Starrett is known for. I should also say that there is no functional difference, that I can find, between the two calipers.
The other refinements (of the plastic dial version) are merely asthetic. The jaws have a slightly different profile and the depth rod is slightly thicker. Nothing that would provide anything better functionally.
I hope that Starrett will return to producing calipers with a metal dial housing. If you can get your hands on one of these, then you will really have something that is "heirloom quality"
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30 of 32 people found the following review helpful By A Customer on May 3, 2001
Part Number: 120A-6Measurement Accuracy: +/-0.001"Resolution: 0.001"Range: 0-6"
I practically grew up in a machine shop with a father that would only buy top quality tools. While I feel that Starret is still a top quality tool I would have to agree with the previous reviewer about the bad decission to change to the plastic dial.That one little detail knocked this tool down from 5 stars to 4 stars. I would have been happy to pay the extra 10 bucks for a metal dial housing. While this may sound silly but this little detail would have cost them a sale if I compaired it side by side with Brown&Sharpe and Mitutoyo and either one had a metal dial housing. Also what happened to quality cases? When I think back to my dads tool boxes (20 yrs ago) all the tools seemed to have wooden finger joined boxes now you get plastic boxes ( not even plastic that is well designed). Finally I would like to say all things being considered this is a very good tool and I would recomend it.
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48 of 56 people found the following review helpful By Gary Yuen on July 8, 2003
Part Number: 120A-6Measurement Accuracy: +/-0.001"Resolution: 0.001"Range: 0-6"
Starrett instruments for years have had a well deserved reputation for quality. With that in mind, I ordered their 120A-6 caliper. Upon receiving it, I immediately noticed the dial was zeroed incorrectly in the 9 o'clock position. Either this caliper was damaged in transit to me, or it was assembled incorrectly.
I contacted Amazon regarding this and the service offered for replacement was fast and courteous. When my new replacement Starrett caliper arrived, I discovered it also had the dial set incorrectly at the 9 o'clock position. This led me to believe that both of the calipers had been assembled incorrectly at the factory.
My next step was to contact Starrett regarding this. They offered to adjust/repair my caliper, all the time still touting their quality and 100% inspection policy on everything leaving their factory, but as I packaged it up to ship to them, I reflected on not just the assembly of this product, but the fact that parts of it (the dial housing) were of inexpensive plastic, as noted by other reviewers. In my opinion, this is definitely not in keeping with a set of ... calipers.
I wound up shipping the Starrett back to Amazon for a refund. I wish Amazon would offer another brand of high end calipers for sale as I found the Starrett to be disappointing, especially so when considering Starrett is the only American made brand available.
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8 of 9 people found the following review helpful By J. Miller on April 4, 2010
Part Number: 120X-6Measurement Accuracy: +/-0.001"Resolution: 0.001"Range: 0-6"
i do not know why since starrett is known for its well made measuring equiptment, but these are the worst pair of calipers i have ever owned the needle scratchs the dial face and the replacement set was out of calibration so badly they will never be corrected. i had to send back the replacement pair for a refund. the whole thing has me asking if they really even were authentic starrett calipers.
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12 of 15 people found the following review helpful By W. D. Grey on November 14, 2008
Part Number: 120A-6Measurement Accuracy: +/-0.001"Resolution: 0.001"Range: 0-6"
I ordered the 120A-6 caliper expecting a wonderful piece of precision measuring equipment. Phillips Steel Company sent me the 1202-6 which is an expensive Chinese made POS. The caliper came in a nice Starrett box and plastic case. Inside the plastic case the caliper was nicely sealed in a plastic bag. The first time I opened the caliper, the needle didn't move. I closed the caliper, the needle still didn't move. Then I tilted the caliper in the process of putting it down on the table and the needle fell off the post inside the dial! Those are the facts, you make the call. BTW the folks at Phillips Steel Company were wonderful to deal with, the fault is in the computers at Amazon. Phillips doesn't even sell the 120A-6 through Amazon. As a courtesy I tried to explain this to Amazon, but the drone on the phone kept telling me to talk to Phillips Steel Company. The Amazon drone was dumber than a box of rocks. Returning the item for refund.
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