ChgImposs Metric & Imperial & US Screw Gauge SAE Whitworth 55 Degree & Metric 60 Degree & & US 60 Degree Thread Pitch Gauge for Industrial Measurement

I bought this for my husband, and he says it’s excellent quality and very accurate. It’s well-made, easy to use, and includes everything needed for precise measurements. He’s very happy with it, so I definitely recommend it

For anyone trying to reverse engineer or design parts for specific applications, this is a must have tool in you're arsenal. For those who don't know, any thread is designated primarily by two values, the nominal/major diameter, and the thread pitch/designation. The nominal diameter is simply the outer diameter of the thread, the largest diameter you can measure (For example, an .25in screw(imperial) is .25in in diameter or an m5(metric) is 5 mm in diameter). This is easy to measure with a ruler or a pair of calipers (Note that the measured size will be slightly smaller than the actual value due to tolerances, remember to round up). The designation or pitch on the other hand is slightly more difficult. The pitch/designation refers to the distance between each thread. There are ways to do so without the proper tool, but it is incredibly difficult. This tool will save you so much time, especially for how affordable it is. Its small, compact and made with good materials. It now lives in my pencil case since it adds a negligible amount of weight and size. With all of the different pitches/designations available, its incredibly functional and is able to measure a large range of sizes. Using it is quite simple, measure the out diameter to determine metric or imperial threading, then use the associated gauges on the tool and line them on on the threads you are measuring and hold it up to a light source, if a considerable amount of light passes through, its not the right size. Continue trying different sizes until you have reached a size that doesn't have most or any light pass through. Then read the number on the gauge and that's your size! I 100% recommend adding this tool to your kit.

sizing could be better listed

I saw "Metric & Imperial" and thought, ok, there will be normal freedom units. But I also saw Whitworth and thought, why not, can't hurt. But I think that the "Imperial" the description refers to is the Whitworth form - which if you think about it is a threadform that is not metric, i.e. it is _one of_ the "imperial" threadforms. That's what you get: metric and British Standard Whitworth. With that out of the way, I'm the perfect customer for this product because I already own a couple of perfectly functional thread gauges for normal American 60deg teeth per inch. I only lacked the metric part. And since I had normal American units covered, it seemed fine to add exotic antique British threads to my capabilities. I think that this Whitworth form (the first standardized threadform I believe) would be useful if you were an antique restorer/collector. Old bicycles, engines, machine tools, etc. had these threads. I think you could use this to check normal American hardware store bolts for threads per inch, but I would be cautious about holding it up to the light and trying to match the exact thread shape. The metric side, the reason I bought it, seems good. I even liked the fact that they stamped the German word for "metric" - if you live in the USA, using metric is like taking a foreign vacation to a nice place anyway. Some people complained about the visibility of the markings. My eyesight is normally not great for stuff like this yet I can see the markings with out my normal magnifier just fine. They are not weakly printed but appear to be durably stamped. I checked an M4, M5, and M6 coarse threads and they all seemed exactly correct. I can't attest that all of the values are good, but these are the most common three I'm concerned about. For the price, this tool is a bargain.

Looks good, should work out perfectly! Easy to use, easy to read. Good price. Work for several different threads.

The product documentation is correct (or not wrong) but the technical terms are confusing because of the history of screw thread standards. Most USA users will want to measure Unified Thread Standard (UTS also known with more precision as UNC/UNF/UNEF course / fine / extra-fine), and this gauge set includes a *VERY SMALL SET* of these, in the middle tier of the device: just six of them, 8, 10, 11, 14, 19, 28 TPI (threads per inch). UTS threads have 60-degree angles and the standard combined and superseded USS ("coarse") and SAE ("fine") threads: the terms USS and SAE are still used informally, and they are valid in the sense that they refer to a subset of threads in the current UTS standard. This gauge includes a much wider set of metric gauges, labeled with decimal points, e.g., 0.25, 1.0, referring to metric thread pitches (these are 60-degree angles). In USA, one encounters metric fasteners pretty often, but not nearly as often as UTS fasteners. This gauge also includes a wider set of BSW (British Standard Whitworth) gauges, labeled with a TPI plus the suffix "G". British fasteners are uncommon in the US. These gauges have 55-degree angles. While they can be used to measure the TPI of the 60-degree UTS screws most common in the USA, they are harder to match, because they don't give you as clear a visual confirmation that the gauge fits the thread you are trying to determine. A well-made thread gauge this size is $40-$50. For the price, this is a fine gauge, if you understand its limited usefulness in the USA. The stamped labels are faint, hard to see, compared to a better gauge.

correspond a la commande

estan bien hacen su funcion

The gauge is an excellent tool in one's tool-box and very handy for ascertaining threads in pipes, bolts and nuts. It is also useful when preparing a cutting tool for machining threads on studs as per size and requirements

good compact design ideal for checking threads to match the correct size, ideal for metric and imperial, matches the thread perfectly great value for money.

Good item