americanNPT pipe thread i want how much taper it has depends on the pipe size/diameter
One-piece cranks use 1/2" thread
One-piece cranks use 1/2" thread
SAE is American or standard thread and metric is everything else. The size or diameter is different and the pitch of the thread is different also.
3/4" garden hose threads (GHT).
Dufferin did not always use the same thread as a standard but it should be a 3/8 - 10.
18 mm standard thread.
Yes. 1/2 x 28 TPI RH
All thread pitches are standard inch size thread pitches. I can't be more specific than that since I don't know exactly which bolt you are talking about. An example for you is the starter bolts are a 3/8-16 pitch, which is standard coarse thread. Most body panel bolts are either 5/16-18 or 3/8-16 pitch, once again, standard coarse thread pitches.
Bolts are categorised by their thread size. The standard socket size for a bolt with a three quarter inch thread is 1 and one eighth inches. Heavy head bolts use a one and a quarter inch socket.
The ANSI B1.11 Microscope Objective Screw Threads standard covers the single screw thread size: 0.8000"-36 AMO. The standard lays out the screw thread parameters and the parameters for screw thread gauging. There is some mis-information published on the web related to this screw thread which is corrected at this webpage: http://www.ring-plug-thread-gages.com/ti-spec-ANSI-ASME-B1.11.htm
What is the thread size for a Winchester Model 90?