First, identify what size threads you want on the outside of the component with the thread nominal size column. The chart below is used for creating male threads on a component to create a bolt or threaded pipe. Based on this size, you should use the corresponding drill size for the hole. First, identify what screw size you will be using. The chart below is used for tapping female threads into a component. This bonded ring seal is sandwiched in-between a shoulder on the male fitting and the face of the female fitting and is squeezed in place. It is a parallel thread fitting that uses a bonded seal ring to do the sealing. BSPP: BSPP (British Standard Parallel Pipe) is most popular in the UK, Europe, Asia, Australia, New Zealand and South Africa.Thus an NPT male will sometimes fit into a BSPT fitting or vice versa but they will not seal.
Another important difference is that for many BSPT pipe sizes the thread pitch is different than NPT. The angle across the flanks of threads (if you sliced the fitting in half long-ways and measured the angle from root to crest to root) is 55 degrees instead of 60 degrees as it is for NPT.
BSPT: BSPT (British Standard Pipe Taper) is similar to NPT except there are important differences. This thread is similar to NPSF but somewhat larger internal only, and straight. NPSI: Dryseal USA (American) Standard Intermediate Internal Straight Pipe Thread. Contact at the crest and root avoids spiral leaks and ensures pressure-tight joints without the use of a lubricant or sealer. The significant feature of the Dryseal thread is regulated truncation at the crest and root to ensure metal to metal contact coincident with or prior to flank contact. NPSF: Dryseal USA (American) Standard Fuel Internal Straight Pipe Thread. A thread sealant prevents leakage of fluids in a threaded pipe connection, learn more about this by reading our thread sealants article. Because of this, they will require sealants to make the connection leakproof. Being straight, NPSM pipes do not seal as effectively as tapered NPT pipes do. However, a male NPT pipe will not fit in a female NPSM pipe. NPSM is sometimes used for fluid power systems and male NPTF pipes will seal with an NPSM female pipe. NPSM: National Pipe Straight Mechanical (NPSM) has a straight thread, unlike NPT, which is tapered. Do keep in mind that straight pipe threads, unlike tapered pipe threads do not offer any sealing function. Also designated "IPS Threads" or "Iron Straight Threads". NPSC: National Pipe Straight Coupling. The main physical differences between NPT and NPTF are the flatness of the peaks and valleys of the threads. NPTF: The American National Standard “Dry Seal” Pipe Threading (NPTF) is self-sealing. An NPT thread requires a sealing agent such as lubricant or tape in order not to leak any fluid it conveys. NPT: American National Standard Pipe Threading (ANSI) distinction. Metric threads come in two different pitch sizes for a given diameter: coarse pitch and fine pitch. As a result, coarse threads are identified by diameter only while fine threads are recognized by diameter as well as pitch size. Coarse threads have the default pitch size whereas fine threads have smaller pitch sizes and are used less often. Metric Threads come in different pitch sizes for a given diameter: coarse pitch and fine pitches. The V-shaped thread form has a 60° flank angle and male and female threads are both parallel. Metric Thread: Metric is one of the first internationally agreed general-purpose thread types. For more information read our articles on thread design and thread standards. Below are the meanings of the various abbreviations and a short description of each. In the charts, you will see many different abbreviations for threads, knowing the meaning of each will help you determine which size of tap to use for your application. This may appear complicated, but again, our tap drill chart will help you match the appropriate tap drill size. This is the thread count, also known as the threads per inch (TPI), that the screw is engineered for. Pitch: It is necessary to understand the pitch of your screw or bolt. This is the distance between the two outer ridges of the threads. Major diameter: Each screw size has just one major diameter. Standard sizes are used mainly for North American users, while metric bolts are often used in Europe. 
Screw sizes come in two different measurement classifications called Standard (SAE) and Metric. Standard or metric: When using a tap drill conversion chart, make sure you know what size fastener you’re using.Tamesons selection of thread cutting toolsīefore we start cutting our threads there are a few factors that we need to know to guarantee we cut correctly:
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