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UN THREAD GAUGES – IMPORTANCE AND USAGE

December 19, 2018 by Frank Xu  

To familiarize…

Thread gauges, as we all know and have heard of, are used to measure the pitch of a screw thread. Although they do not provide the exact value of the pitch of a screw thread, but they provide a very good approximation of the desired parameter. There are various kinds of thread gauges available in the market. They are metric thread gauges, UN thread gauges which are also known as Unified National thread gauges, NPT thread gauges, ACME thread gauges, etc. In this article, we will dive deeper into UN thread gauges including their types, sizes and how they prove useful in mechanical and manufacturing industries.

UN Thread Gauges

UN thread gauges stands for Unified National thread gauges or Unified Constant Pitch thread gauges. Its standard tolerance for plug 2B and ring 2A can be given as internal thread tolerance class being 1B, 2B, 3B and external thread tolerance class being 1A, 2A, 3A. For regular applications in the manufacturing and mechanical industry like manufacturing of certain parts, which can be either bolts, nuts, screws or fasteners, classes 2A and 2B can be seen being used more commonly. In case of certain manufacturing purposes where a closer tolerance is desired, classes 3A and 3B can be put into application. The easiest and the most convenient or liberal classes that are used are 1A and 1B. These are used when the thread is slightly dirty or a bit bruised. These are also used when some part is to be assembled quickly and easily and a liberal allowance is required for such a purpose to be achieved.

Specifications of UN Thread Gauges

One can buy UN thread gauges very easily at various online and offline platforms. Many a times, one can get great offers and discounts from various suppliers online. Many suppliers are there in the online market which supply UN thread gauges which are made from the material which is GCr15 bearing steel oil hardened tool steel. It is actually very suitable because it has high wear resistance and hence, longer durability. The hardness of such a material can be assumed to be somewhere between 58 HRC to 62 HRC.

Buying the Right Size of UN Thread Gauges

It is very important to buy the right size of the UN thread gauges, as many a times, very accurate pitch length is required and if it is measured incorrectly, it could lead to huge losses in the mechanical and manufacturing industries and lead to customer dissatisfaction. There is a range of sizes available for thread gauges. UN thread gauges come in various sizes like 5/16-20 UN, 7/8-12 UN, 15/16-32 UN, 1”-16 UN, 1 1/16”-28 UN, 5 7/8”-16 UN, etc. One must know the purpose he is buying the thread gauge for and then buy the right size of the thread gauge, so that the purpose of buying is wholly achieved.
 
Similarly, other thread gauges are also available in different sizes according to the purpose.

 

Frank Xu is the author of this article on ACME thread gauges. Find more information, about NPT thread gauges.

Metric Taps, simple but highly useful tools

December 14, 2018 by Frank Xu  

We don’t notice it too often, but the heavy machinery and technology that we are using today wouldn’t have been possible without the use of nuts and bolts. From the very beginning of mankind, nut and bolts have been used for various purposes. Earlier, large bolts made of wood were used. They wore out with time and couldn’t be used with heavy loads. With the evolution of machinery, the requirement for attaching heavy parts lead to the production of metal nuts and bolts, which resisted breakage more efficiently and could bear heavier loads. Since then, various sizes and shapes of nuts and bolts have been manufactured.

 

So, how are these wonderful tools made? Well the answer to this question is another highly tool called dies and metric tap (or simply taps). A tap is used to cut threads on the inner surface of a hole, creating the female part which acts like a nut. Now-a-days, there are many types of taps available in the market to cater the various needs of the customer. Some of the most important ones are discussed below.

 

1. Bottoming tap (or plug tap) - This type of tap has almost no tapers (not more than 1-1.5). This taper is used when we need to cut threads in a hole which has already been threaded by a more tapered tap. However, due to the absence of tapers, this tap can’t be used to create a new tap from the beginning. This can only be used to deepen the thread to the bottom.

 

2. Intermediate tap (or second tap) - The number of tapered threads for this type of threads may vary from 3 to 5. These taps are used to create new threads in an untapped hole.

 

3. Taper tap (hand tap) - This type of tap has relatively larger no of taps ranging from 8 to 10. Owing to this type of tapering, this tap gives a very smooth and gradual cutting effect. This is highly useful when the material to be threaded is too tough or is delicate.

 

4. Power tap (swarf) - These taps are designed to be used manually. They must be rotated in the reverse direction at regular period to prevent the crowding of metal chips in the hole which can damage the tap as well as the threads cut. To prevent this, spiral taps have been introduced which automatically drives out the chip. They are generally used for fast, automated taping operations due to their appreciable performance on blind holes.

 

5. Forming tap- This tap is quite different from the other kinds of taps discussed above in the way of making threads in the hole. While the other taps carved threads into the holes by actually cutting out metal chips, the forming tap does no cutting at all. It literally ‘forces’ the hole surface inwards, transforming it into the form of threads. This type of tap due to its harsh way of working, requires to be properly lubricated during the taping process. Also, it can be used ONLY with relatively softer materials like mild steel and aluminium. This way of taping is used when it is necessary to avoid metal chips which can produce difficulty in the taping process.

 

With this large variety of taps available, it is very important to choose the right type of metric thread tap in accordance with the type of threading required, the material to be threaded, size of threads required, the mode of threading, and other such factors.

 

Gaugestools, a metric taps and dies supplier, provides a rich range of taps and dies which will surely fulfill your need for any type of taps and dies.

 

Contact :

Chenchuan Tools Co.,LTD

Chenbei Industry Zone,

Longgang Road,

Huangshi,Hubei

China, 435202

Phone:  0714-7321211

Fax  :  0714-7321210

 

Metric Taps, simple but highly useful tools

December 14, 2018 by Frank Xu  

We don’t notice it too often, but the heavy machinery and technology that we are using today wouldn’t have been possible without the use of nuts and bolts. From the very beginning of mankind, nut and bolts have been used for various purposes. Earlier, large bolts made of wood were used. They wore out with time and couldn’t be used with heavy loads. With the evolution of machinery, the requirement for attaching heavy parts lead to the production of metal nuts and bolts, which resisted breakage more efficiently and could bear heavier loads. Since then, various sizes and shapes of nuts and bolts have been manufactured.

So, how are these wonderful tools made? Well the answer to this question is another highly tool called dies and metric tap (or simply taps). A tap is used to cut threads on the inner surface of a hole, creating the female part which acts like a nut. Now-a-days, there are many types of taps available in the market to cater the various needs of the customer. Some of the most important ones are discussed below.

1. Bottoming tap (or plug tap) - This type of tap has almost no tapers (not more than 1-1.5). This taper is used when we need to cut threads in a hole which has already been threaded by a more tapered tap. However, due to the absence of tapers, this tap can’t be used to create a new tap from the beginning. This can only be used to deepen the thread to the bottom.

2. Intermediate tap (or second tap) - The number of tapered threads for this type of threads may vary from 3 to 5. These taps are used to create new threads in an untapped hole.

3. Taper tap (hand tap) - This type of tap has relatively larger no of taps ranging from 8 to 10. Owing to this type of tapering, this tap gives a very smooth and gradual cutting effect. This is highly useful when the material to be threaded is too tough or is delicate.

4. Power tap (swarf) - These taps are designed to be used manually. They must be rotated in the reverse direction at regular period to prevent the crowding of metal chips in the hole which can damage the tap as well as the threads cut. To prevent this, spiral taps have been introduced which automatically drives out the chip. They are generally used for fast, automated taping operations due to their appreciable performance on blind holes.

5. Forming tap- This tap is quite different from the other kinds of taps discussed above in the way of making threads in the hole. While the other taps carved threads into the holes by actually cutting out metal chips, the forming tap does no cutting at all. It literally ‘forces’ the hole surface inwards, transforming it into the form of threads. This type of tap due to its harsh way of working, requires to be properly lubricated during the taping process. Also, it can be used ONLY with relatively softer materials like mild steel and aluminium. This way of taping is used when it is necessary to avoid metal chips which can produce difficulty in the taping process.

With this large variety of taps available, it is very important to choose the right type of metric thread tap in accordance with the type of threading required, the material to be threaded, size of threads required, the mode of threading, and other such factors.

Gaugestools, a metric taps and dies supplier, provides a rich range of taps and dies which will surely fulfill your need for any type of taps and dies.

 

Contact :

Chenchuan Tools Co.,LTD

Chenbei Industry Zone,

Longgang Road,

Huangshi,Hubei

China, 435202

Phone:  0714-7321211

Fax  :  0714-7321210

 

UN THREAD GAUGES – IMPORTANCE AND USAGE

December 12, 2018 by Frank Xu  

To familiarize

Thread gauges, as we all know and have heard of, are used to measure the pitch of a screw thread. Although they do not provide the exact value of the pitch of a screw thread, but they provide a very good approximation of the desired parameter. There are various kinds of thread gauges available in the market. They are metric thread gauges, UN thread gauges which are also known as Unified National thread gauges, NPT thread gauges, ACME thread gauges, etc. In this article, we will dive deeper into UN thread gauges including their types, sizes and how they prove useful in mechanical and manufacturing industries.

UN Thread Gauges

UN thread gauges stands for Unified National thread gauges or Unified Constant Pitch thread gauges. Its standard tolerance for plug 2B and ring 2A can be given as internal thread tolerance class being 1B, 2B, 3B and external thread tolerance class being 1A, 2A, 3A. For regular applications in the manufacturing and mechanical industry like manufacturing of certain parts, which can be either bolts, nuts, screws or fasteners, classes 2A and 2B can be seen being used more commonly. In case of certain manufacturing purposes where a closer tolerance is desired, classes 3A and 3B can be put into application. The easiest and the most convenient or liberal classes that are used are 1A and 1B. These are used when the thread is slightly dirty or a bit bruised. These are also used when some part is to be assembled quickly and easily and a liberal allowance is required for such a purpose to be achieved.

Specifications of UN Thread Gauges

One can buy UN thread gauges very easily at various online and offline platforms. Many a times, one can get great offers and discounts from various suppliers online. Many suppliers are there in the online market which supply UN thread gauges which are made from the material which is GCr15 bearing steel oil hardened tool steel. It is actually very suitable because it has high wear resistance and hence, longer durability. The hardness of such a material can be assumed to be somewhere between 58 HRC to 62 HRC.

Buying the Right Size of UN Thread Gauges

 

It is very important to buy the right size of the UN thread gauges, as many a times, very accurate pitch length is required and if it is measured incorrectly, it could lead to huge losses in the mechanical and manufacturing industries and lead to customer dissatisfaction. There is a range of sizes available for thread gauges. UN thread gauges come in various sizes like 5/16-20 UN, 7/8-12 UN, 15/16-32 UN, 1”-16 UN, 1 1/16”-28 UN, 5 7/8”-16 UN, etc. One must know the purpose he is buying the thread gauge for and then buy the right size of the thread gauge, so that the purpose of buying is wholly achieved.

Similarly, other thread gauges are also available in different sizes according to the purpose.

 

Frank Xu is the author of this article on Trapezoidal thread gauge. Find more information, about Whiworth thread gauge .