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This sounds like an easy question, but the answer depends on which type of thread call-out you are trying to read.
There are multiple types of screw threads and each has its own call-out; but many are similar in syntax.
The most common screw thread style in the USA is the UN-series. These screw threads are specified in ANSI/ASME B.1.
An example of a UN-series thread call-out is:
1/4"-20 UNC-2A
Decoded it is:
Nominal Major Diameter (1/4")-Threads-per-inch (20) Type of thread (UN) Sub-thread-series (C)-Class-of-fit (2A)
An example of the M-series thread call-out is:
M16x1.5-6g
Decoded it is:
Type of thread (M) Nominal major diameter (16) Thread pitch (1.5) class-of-fit (6g)
For more detailed information here is a link to a nice PDF book which gives very clear basic information on screw threads: http://www.ring-plug-thread-gages.com/ti_starret.pdf.
I do hope that you found this information helpful.
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∙ 11y ago
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Which simple machines are made of other simple machines?
screws have something called a thread, and this thread wraps around the screw. You can call the thread a kind of ramp, because this thread prevents the screw from falling off.
Angle of thread for different thread?
The angle of a thread of a screw is an angle between the threads and it is the defining factor for the shape of the screw thread.
What is single thread of screw thread?
when lead of the screw is equal to the pitch it is called single threaded screw
What is the function of screw thread?
it is what allows the screw to grip into the material its being screwed into. a screw without a thread is a nail
Thread used in screw jack?
acme thread
Can a screw thread be the same as a gear?
Yes, a parallel sided screw thread is in effect a worm gear.
What is the relationship between a nut thread and a screw thread?
when a spiral groove is cut over a hole, then it is nut thread. when a spiral groove is cut over a shaft, then it is screw thread.
What is micrometer screw?
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 does the A signify in the thread call out of 250-20UNC-2A?
A refers to the external thread of a screw or bolt. B means internal thread, specified for nuts and inserts. For example a 2A bolt uses a 2B nut
What is screw thread?
This is a tool that is used to measure the pitch diameter of a screw. This tool looks like a standard micrometer except that the anvils are specially configured to reach into the screw thread groove and touch the pitch diameter of the screw thread. The screw thread micrometer does not measure any other aspect of the screw thread. It does not measure the: pitch; threads-per-inch; major diameter; minor diameter; flank angles; lead; helix angle.
What are some examples of a screw in everyday life?
If you mean 'Screw Thread' I will give examples, but first understand that the word screw is a process. It is something you can do. We often say 'Screw these pieces together'. Now some examples :- Top of a toothpaste tube with a screw on lid. top of a jar of food with a screw on lid . A screw thread inside a water tap handle. Most common of all of course is a wood screw, and a metal thread screw or bolt.. Also the screw thread on the cap of a bottle of soft drink.
Why the instrument is named Screw gauge?
The instrument is called a screw gauge, or more often a micrometer, because it uses a screw to amplify a very small movement so that it can easily be read. The heart of the screw gauge is a very accurately ground thread, usually of 0.5mm pitch, so that the axial movement of the screw corresponds to a much larger movement of a barrel which carries a scale. The instrument can be difficult to read because two readings have to be added, one measuring to 0.5mm the linear motion of the screw, and the other on the barrel giving the 1/100 ths. To some extent this instrument has been superseded by the electronic digital version, which does not incorporate a screw thread. A different gauge, called a thread gauge, comprises a set of metal blades with serrated edges which can be used to identify different screw threads by matching the right blade to the thread by trial and error.
