Fowler52-485-006-0, Inch Tapered Thickness Gages 26 Leaf Set

As a couple of other reviewers have done, I measured all of the gages with a 1/2 10 thousandths micrometer to check the accuracy of the set. I found all the values to be pretty good but wanted to know what the specifications were. The description is not for this set of gages but for a bore micrometer so I went to the Fowler site and found that this set is supposed to meet US Federal Specifications. After some searching I found the US Federal Specifications which are given in GGG-G-17C but found the actual values from Starrett on an RS website. After comparing all the measurements I found 2 that would not pass (but were very close) which can be seen in the attached picture of the spreadsheet that I used.While doing my measurements I found that I had to clean a lot of "grit" from the gages before they would read correctly. Even after several cleaning an re-checking the measurements, there were two of the gages that did not pass; the 0.009" and the 0.017 which were off by 0.00003" and 0.00006" from GGG-G-17C respectively. Even though they didn't meet this specification, they are more than accurate enough for normal use.As another reviewer found the average deviation from the marked value was 0.00018". All the values save one were slightly higher.To make sure that I was not being unfair to the two gages that didn't meet the specification, I remeasured them using a Federal-Mahr Maxum 100 thousandths thickness gage and got the same values within 0.00005 as my micrometer had gotten so I feel confident in my original measurement.The 0.005" gage also had a burr on the edge that caused a mis-measurement but I scraped it with my fingernail a couple times and it came right in.I checked the consistency of the thickness at 3 points along its length and all the gages were good. Note: this measurement was done in mm.While I was doing all the checking, I also checked to make sure that the markings for the metric and inches were the same value when inter-converted. All the marking showed the same valued in both metric and imperial. I have had this problem with another set of gages that caused all kinds of problems.Also note, there is no individual serial number so one will have to be generated to be put into a metrology system.All in all these are a very good set of gages for the price but they must be thoroughly cleaned before any high-precision use.

I pay big for my metrology tools. I have $1300 in 0-4” Mitutoyo quantumics. ( which are amaZing)I also know when it doesn’t pay to shell out cash for a name. This is one of those instances! They are ground to .0002” and for a feeler gage that is all you can ask. It is tapered at the ends making it much easier to slip it under parts. It is oiled to prevent rust. It is well made. It is all I wanted in a feeler set and it’s like $22!!! Great deal. Usually I steer clear of Fowler as it could be made in Germany or China. It is a lottery that is no fun to play. Almost everything Fowler they just farm out to the lowest bidder and slap their name on it. In this case these are legit and very well made.

good tool for checking two stroke piston ring gaps thanks great product

I needed this for work. Everywhere I looked was quite expensive and did not have as many leaves. This one was very reasonably priced and had more leaves than the higher priced ones. It works great!!!