Thread Gauges- An Indispensable Part of the Metrology Facet

Out of all the horrible things in life, gulping down a bad cup of tea tops the list. The tea time ended on a rather bad note. My raised brows were enough to give my assistant the signal. The bill of quotation had everything listed with utmost precision.  Materials, manpower, electricity costs, we had everything in place. However, the time my eyes turned to Inspection and Measurement, I was downright disappointed. The sheet did anything but impress me. How is it humanely possible to miss out on ACME thread gauges?

It took me a good fifteen minutes to blast on him. Can you imagine sending the engine parts without the examination? This incident actually was an epitome of irresponsibility and complacency. A metal working factory needs to follow guidelines with utmost dedication. Any rule breaking and we lose the contract. Naturally, he commenced the search as well as the research part.

He dared to enter my cabin only a week later. The time he was well equipped with all the possible information. He handed over a sheet and insisted me to read it when free. Since we were looking forward to having updated gauges on board, he did the study accordingly. Facts I can pick up from the memory lane:

· Surprisingly, even UNS thread gauges have a tendency to get worn out. They say constant usage on the shop floor plays the culprit. Calibration in the Standards Room is the only resort available during such situations. Checking their usable size range also becomes quite easy!

· Do you know the above instrument also goes by the name of male gauge? Apparently, their dimensions can be physically measured within no time.

Reason: the pitch diameter has the amending ability when it comes to metrological; measurements.

· Not to leave out on the structure aspect, it normally has a cylindrical body with threaded ends. Yes, there is most certainly no room for complication.

· Most importantly, they enter the picture with a go/no-go testing. Now that seemed like a point worth marketing to all my fellow mates!

· What is more is that they are manufactured to Class X tolerance and given a certificate of accuracy. Talk about accreditation by the American National Standards Institute (ANSI)!

· The fact that their operation is handled electrically or by electrical batteries is highly commendable.

· , on the other hand, also has a different name. No guesses for it is also called as ‘UNC thread gauges’. If at all someone tells you to delve into this topic, make sure not to freak out. Explain that it is basically a ‘nut’ with closer tolerances. For the very same reason, their inspection is done by their plug counterpart. This also gives rise to the concept of ‘Check Plug Gauges’.

As I put my glasses down, I tried to detect my assistant’s work devotion level. The document could easily pass off as one of those comprehensive research papers! The next thing I know I was filling my online cart with the tinkering instruments.   

Build your Garage Storage with Thread Gauges

Having a knack of carpentry and building frames in the past encouraged me to build my own garage storage. At first, I was not that confident enough to perform this task as I had left the practice of such works for quite a few years. With good observation skills, I had gathered the knowledge of carpentry and frames but hardly practiced it. Now, that I was in need of a storage in my garage, I decided to do it myself. It was not an easy decision because the process involved a lot of difficulties. That was the time, the thread gauges proved to be the best help to solve all my difficulties. Gauges are actually a tool that helped me to measure the major and minor diameter, pitch diameter, and per inch of the threaded part of the nuts and screws.

I wanted a build a garage that stored all my equipments and materials that included some loose stuff, plastic bins, lids, etc. we want to get some standard thread gages for usual thread checking. for example,  7/16-28 UNEF ring gage    1/2-28 UNEF plug gage      9/16-24 UNEF ring gage     5/8-24 UNEF plug gage  also planned for a corner of the storage to hang my heavy-lift bike, wheel barrow holder and much more. My plan was very well-structured and I was determined to execute it as it was. For this, I got all the tools and materials which included drill, shape measure, circular saw, extension ladder, nuts, lag screws, corner braces and many more. I managed to get all the materials as per my ideas, needs and requirements. I started my work by measure the ceiling and my garage top. With this I was likely to determine the space that the shelves would occupy. The first thing that I started with was attaching the corner braces to place the shelves. Here, I noticed one of the biggest mistakes in my whole plan. To fix the braces, I had to make use of the screws and nuts. I could only attach the braces efficiently if the screws and nuts were fixed appropriately. The screws were just not fixing as I was unaware of the length of the nuts and the space enabled in the corners.

I got really panicky for the shelves would not hold if the nuts were not in place. My friend suggested using UN thread plug gauges. These gauges are meant to measure the internally threaded part of the nut. As my friend suggested I got a couple of these types of gauges that made my work much easier than before. As I also needed to use the screws in abundance, I did not want to face the same problem again. My friend informed me about thread ring gauges that are specifically meant to measure the externally threaded part of the screws. Without any extra efforts, I was able to pass the gauges throughout the entire length of the screws and nuts that gave the exact measurement of the tools. With the help of gauges and all the other tools, I was finally able to fix all my shelves and holders efficiently.  

Gauges made my work really very easy and since then, these tools have been a part of every carpentry activity I took up.  

Buy Good Quality Thread Gauges On Customized Orders

As a plumber I dealt with many kinds of tools every day. There were several tools associated with pipes which meant to check the right size and fittings of each kind of fixture. Every day I dealt with many leakage issues and there were many situations where I had to replace a broken pipe with a completely new set. At time fixing them was not so easy task it required understanding the measurements and actual size of the threads of the pipes. Mostly the repair works were occurred in kitchens and bathrooms. The piping needed UN thread gauges to know the real size of corresponding fitting.

I always relied on my tool box for good services to the clients.  Wherever I went my tool box was the only thing that accompanied me. Inside the kit were different kinds of instruments varying according to the size. I had collected them from various shops and now I did not remember the last time I purchased an instrument. Later, I realized that one of the smallest tools was missing and I needed it urgently. I looked into many shops but could not find one anywhere. Finally, I found an online portal that sold UNS thread ring gauges of any size and diameter. For me it was a relief to know that there were ring gauges available in custom made sizes. I had to immediately order one, as I had a client urgently calling to check with a leakage problem.

This was the first time I was purchasing a gauge online. They sold only quality products which were certified with calibration. Everything I wanted for my tool box I found it here. It was a multipurpose website and given my profession I was in need of different types of gauges tools.  In this profession the main components were having the right size of tools and gauges. However, there were times when I did not find them in any of the local hardware shops. Even if a particular shop sold such products they were not the right type I was looking for. I was tired of looking for right set of thread plug gauges which most shops had limited stock. finally I choose 1/2″-13 UNC plug gage 9/16″-12 UNC plug gage  5/8″-11 UNC plug gage  3/4″-10 UNC plug gage

I also decided to buy by sending them specifications of the required products for daily use. It was a good decision as I was fond of collecting as many tools for my convenience.  Whenever I was on site dealing with a fixture issue, I always had my instruments on which I could rely on to complete my task quickly.

On many occasions I felt the need of having different types of gauges but always was deprived of one because the shops did not have sufficient stock. After I came to know about this site, I made at least four or five orders from them. All the tools were shipped to my front door without any damage on the product. I was aware of the high quality raw materials utilized in the making of these gauges. I never really had any bad days after the purchase made from this site. 

Fix Nuts and Bolts Conveniently with the Help of Thread Gauges

I had never done any kind of constructive work before but had fun looking people do it. I had a keen interest in learning the civil works that were done by engineers or mechanics. As my field of study was completely different from that of my interest, I did not try to attempt such activities. Once some repair work was needed in the cabinets of my kitchen, I called a plumber for the purpose. As I was a good observer, I observed each and every action that he performed. While observing, I noticed that he was using thread gauges to measure the deepness of the nuts and bolts that he was fixing. I even asked the plumber certain questions for my knowledge about the works done by him.

The other day, I was in need of a small storage unit or a cabinet to be placed in my room. This time I decided to try it out on my own. I thought that this is the correct time to turn my observatory skills into practicality and test them. To build a wooden storage, I got all the necessary equipments so that later I do not find any inconvenience. Wooden ply, measuring tape, planning blades, screws, nuts, drill, and duct tape was all that I brought to my place. I began by planning out the structure of the unit and accordingly cutting wood ply into parts. Till here I could conveniently perform my task exactly the way craftsmen do. I was quite happy with my work as I had never thought of doing such activities on my own.

When I began to put all the material together on the basis of screw and nuts, there appeared a problem. The task of fixing the door was becoming a real mess because I was not able to figure how to fix the nuts and screw properly. The problem was the threads present down the neck of the nuts and bolts. Because of those threads all my work was paused and I just sat down scratching my head wondering should be done. After thinking a lot, I remembered that while fixing my kitchens’ cabinet, the artisan used a gauge to fix it. It just slipped out of my mind while purchasing all the other tools. I went to the store and asked for UN thread ring gauges that are used for checking the acceptance of a screw’s external threaded part. The shopkeeper asked if I needed thread plug gauges as well. I was not aware of this type as I was just a beginner. I tried to enquire about the material from him to which I acknowledged that these gauges are used to check the acceptance of the internal threaded part of the nuts.

I bought both the types of gauges home and resumed working. the detailed thread gages I bought are :

5/16-20 UN thread gauge 5/16-28 UN ring gage 3/8-20 UN plug gage 3/8″-28 UN ring gage 7/16-16 UN plug gage    7/16-32 UN thread gauge 1/2-16 UN ring gage By using these equipments, I could easily check the correctness of pitch diameter. This made my work easier than before and I could fix all the parts and doors conveniently.  It was really an amazing experience. I got to learn a lot of new things.       

Buy Best Quality Thread Gauges from Reputed Manufacturers Online

I wanted to invest in a gauge as I own a production shop where the screws and the nuts have to be inspected for acceptance. As it is my own business, I have to be careful about the money I invest in it. These thread gauges are mainly used in the shop for acceptance gauging of threaded parts. These have to be checked properly so that I ended up purchasing the right products. There are different types of gauges which need to be used for the process. UNC thread gages, UNEF thread gages, Metric thread gages etc.On searching online, you will come across many manufacturers and suppliers who offer a wide range of tinkering instruments. To choose the right type, you need to first know which type would suit your requirement.

These manufacturers offer thread ring and plus gauges. These include GO / NOGO, RH/LH (right hand and left hand). The solid ring gauge can be made use of to check the acceptance of a screw which is an externally threaded part. Usually the GO and NO-GO rings are separate pieces. This helps to check the correctness of the thread through depth and pitch diameter. The adjustable ones are also ring shaped which have a split and an adjusting and locking screw feature which helps for fine tuning.

Thread plus gauges can be used to inspect the acceptance of a nut that is an internally threaded part. It will be double ended for small threading parts. One end will carry the GO gauge while the other end will carry the NO-GO.  There are usually two separate pieces for larger parts. This type helps to check the accuracy of the pitch diameter.

There are some factors you need to consider while looking for a manufacturer –

· A professional supplier should have a good stock of the gauges that the customers would require. They should be available in varied sizes to meet different customer needs. if you need 1/4"-18 NPT ring gage, the supplier can supply, if you need 1/2"-14 NPT plug gage, the supplier can supply, if you need 3/4"-14 NPT ring gage, the supplier can supply, if you need   1 1/2"-11.5 NPT thread gages, the supplier also can supply!

· They are very particular about the quality of products they offer. They adhere to strict quality control in the manufacturing process. They ensure to test equipments to provide the best to customers.

· It is always good to look for manufacturers of NPT thread ring gauges who provide customize production services to meet unique customer requirements. They provide plugs or rings as per your specifications. When I wanted to purchase these products, I was not able to find rings as per my requirement. This is when I came across a manufacturer who offered customized production services and ensured to deliver the product I was looking for.

· There may be times when you will need products quickly. For such times, you need to ensure to choose a supplier who offers quick delivery of products on an urgent basis. This does not require you to wait not affecting any of your processes.

· You need to check the customers they have provided services to, to get an idea of their quality and popularity in the industry. A good portfolio directly signifies high quality service.

· It is essential that you purchase from a manufacturer that has good customer reviews. This is one thing I searched well on the internet as I knew that if the customers of a company are satisfied, the product will be of good quality. 

Working with the Best Thread Ring Gauges Manufacturers

As a plumbing professional, I have worked with endless number of nuts and bolts. The size of these little parts does not reflect their significance in any way in my line of work. The most important thing about them is ensuring that they are perfect down to every threaded part. Speaking of threaded, it is exactly this aspect that holds such immense importance. When it comes to plumbing every little part needs to be precise to be able to complete a project successfully and ensure its durability. There is no place for substandard work and this is exactly why when my set of thread gauges started wearing off, I decided to look for a new manufacturer to supply them.

I have always used a number of thread gauges manufacturer by different companies. However, this time I wanted to buy a set of diverse types of gauges and ensure that they were standardized and could be easily replaced if they do not fit the specifications. I need 

1 5/16″-6 UNC ring plug gage   1 3/8″-6 UNC  ring plug gage   1 1/2″-6 UNC  ring plug gage  1 3/4″-5 UNC  ring plug gage  to check the my threaded parts

 I looked for a manufacturer online, and after reviewing a few, settled on researching this particular company further. They had an impressive experience of catering to a variety of industries and manufacturing a huge variety of thread gauges fro ring gauges to thread plug gauges. I was looking for GO and NO GO types of gauges for all the different products. They also stocked a variety of sizes and tolerance and almost every standard size could be ordered.

I decided to go ahead and ask for a quote. It was as simple as specifying the diameter and pitch that was needed, whether it was to be right or left-handed, plug or ring, and the quantity required. They were super responsive and replied with the estimates immediately. I was delighted to know that they offered really good deals. Also, since they provided a long list of thread gauges I was looking forward to consider them even for future purchases. Another notable thing was the company was an international supplier. They catered to companies from America, Canada, Mexico, Peru, Argentina, Brazil, Holland and even the Middle East.

One of the reasons I opted for them was that they offered same day express delivery. This was great since I could start working with my new tools immediately and test them too. I was looking forward to use the metric thread gauge in future after reviewing how the quality of the products offered was. I was pleased at the pace of the service provided and the delivery was quick as promised. The thread gauges themselves seemed of high industry standard.

After putting the gauges through much use I can safely say this company manufactures incredible products. I would highly recommend their production shop tools like thread gauges and thread taps. I am greatly looking forward to my next purchase the metric thread gauge. Apart from top notch products, their excellent service and speedy delivery were the winners. Their convenient payment options made it easier to place an order and avail their swift service. If your machinery needs tinkering, this is the shop to go for!

What is the difference between UN and UNJ

WHERE

The J series thread is defined in specification ANSI/ASME SAE AS8879 (formerly MIL-S-8879) and in ANSI/ASME B1.15

WHY
The rounded root of a UNJ external thread greatly improves fatigue strength over that of a flat root UN thread. It seems that sharp cuts at the minor diameter of the external screw thread create stress points where fractures can begin and which ultimately cause failure of the external thread. An additional benefit is that the rounded root of the UNJ thread reduces the rate of threading tool crest wear. The internal thread does not get the same rounded root treatment because the internal thread usually has more mass around the thread and is nearly impervious to stress fracturing. If you have a situation where the internal thread is made in a thin wall part and stress fracturing is a concern; there is an internal thread rounded root option option available, but it is not officially codified.

CLASS-OF-FIT
Typically and historically the J-series of thread has been Class-of-fit 3A and 3B. This is the only class designated in ANSI/ASME SAE AS8879. Not as common is Class-of-Fit 2A and 2B which are permitted and defined in ANSI B1.15. If you have a requirement for a J-series thread it would be best to verify the class-of-fit if it is not designated on the product drawing.

INTERNAL SCREW THREAD
The UNJ for internal threads is identical to the UN thread except that the UNJ minor diameter is slightly larger than the UN minor diameter. This is to allow the minor diameter of the internal thread to clear large root radius of the UNJ external thread. If a UNJ bolt is screwed into a UN nut there will in most cases be an interference fit at the thread minor diameter.

EXTERNAL SCREW THREAD
Both UNJ and UN are used for external threads.

External UNJ threads per SAE AS8879 have a rounded controlled root radius at the minor diameter. The minimum root radius is calculated at 0.15011p and the maximum root radius is calculated at 0.18042p. The root contour shall have a smooth, continuous, non-reversing contour and shall blend tangentially into the flanks and any straight segment. The radius is larger than the UNR style

External UN threads per ANSI/ASME B1.1
Paragraph 1.3: UN threads have "a flat or optional rounded root contour" at the minor diameter.
Paragraph 2.3.1: UN threads have "a flat root contour" at the minor diameter, but "a rounded root contour cleared beyond the 0.25P flat width of the basic profile is optional"..."to provide for some threading tool crest wear."

PRODUCT COMPATIBILITY
UN Bolt into UN Nut = No problems.
UNJ Bolt into UNJ Nut = No problems.
UN Bolt into UNJ Nut = No assembly problems; functional problems are possible.*
UNJ Bolt into UN Nut = In most cases an interference fit at the thread minor diameter; functional problems are possible.*

SCREW THREAD WORK PLUG GAGES
UN = UNJ
The only difference between the internal UNJ thread and the standard UN threaded is that the UNJ thread has a larger minor diameter. The thread work plug gage does not check the minor diameter of the thread, thus when checking the threads, standard UN style Work Plug Gages are used. If UNJ gages are ordered from a gage maker, the gage maker will supply the standard UN gage members with a handle marked UNJ. The minor diameter of internal threads should be checked with plain pin gages.

SCREW THREAD RING GAGES
2A or 3A GO: UN ≠ UNJ
2A NOGO UN =or≠ UNJ (Varies by size/pitch; assume ≠.)
3A NOGO UN = UNJ
Because of the large root radius on the minor diameter of the external thread, the UNJ GO ring gage is supplied with an enlarged minor designed to clear the root radius. The GO ring gage is the only gage that is modified specifically for the UNJ specification and the only difference between the UNJ GO and the UN GO thread gages is the minor diameter. The UN GO ring gage if used to measure the UNJ thread the gage will reject the part because of the minor diameter interference. The UNJ NOGO ring gage is identical to the UN NOGO ring gage except that it may be marked with a "J". The minor diameter of the NOGO ring gage is relieved to just below the pitch diameter, and because of this the standard UN NOGO gage will clear the minor diameter of both the UN and UNJ external threads.

SCREW THREAD SET PLUG GAGES
UN = UNJ
The set plug members used for the UNJ series threads are identical to the set plugs used for the UN series. If UNJ gages are ordered from a gage maker, the gage maker will supply the standard UN gage members with a handle marked UNJ. This is because set plug gages do not check the minor diameter of the ring gage they are setting. The minor diameter of the ring gage should be checked with plain pin gages after the ring has been properly set with the set plug.

HOW TO CHECK THE ROOT RADIUS
Use an optical comparator to check the UNJ external thread form root radius at the minor diameter. The thread radius must be smoothly blended with the flank angles leaving no sharp groove or edge at the root of the thread.

THREAD NOMENCLATURE
UN = Basic Unified National thread series
UNJ = Basic Unified National thread series with external thread controlled root radius
UNS = Special Unified National thread series
UNJS = Special Unified National thread series with external thread controlled root radius
UNC = Unified National Coarse thread series
UNJC = Unified National Coarse thread series with external thread controlled root radius
UNF = Unified National Fine thread series
UNJF = Unified National Fine thread series with external thread controlled root radius
UNEF = Unified National Extra Fine thread series
UNJEF = Unified National Extra Fine thread series with external thread controlled root radius

NOTES:

gaugestools can provide UN thread gages and UNJ thread gages