Metric thread gauges
are a significant tool that helps in creating appropriate thread angles to hold or join several things. Talking of engineering, thread taps and gauges play an irreplaceable part in this domain. With the help of taps, you can create perfect threads with an appropriate angle to attach the screw.
But, how will you know how long should the tap be? For this, you need to have sound equipment which will suffice the need of measuring length, breath, diameter, thread angles, etc. To do this, it is imperative to have an in-depth knowledge about gauges.
Let’s discuss some of it in the following sections.
What are the different types of metric thread gauges?
Here is a list below of the thread gauges which you need the most –
— UNF thread gauges
— UNC thread gauges
These are the few of them that you will need most. But, amongst all these, if you are into engineering, there are few things more to know that will make your process of measuring, creating threads and fixing things easier.
UN, UNC and UNF thread gauges — terminologies
When it comes to measuring unit, it is of extreme importance that you understand the basic difference otherwise working on it can be quite difficult. This is exactly what you are to learn here.
As per the definition in ANSI/ASME, UN series is the new introduction to replace the old N-series of taps and threads. UNC refers to Unified Coarse or National Coarse in retailing. Whereas, UNF refers to Unified Fine or National Fine in retailing.
What are the aspects you need to know for calculating metric thread gauges?
It is not like seeing the size and measuring with a scale. When performing any metric thread calculation, there are different logistics that you must keep in mind –
i. To calculate diameter
There are 5 measuring data that you need to check – major diameter; pitch diameter, minor diameter, over wires, wires diameter.
ii. To calculate thread builder
This calls for 4 data if the number of Starts is 1. Here are the data that you need to check – Basic diameter, thread per inch, designation and class. You can change the class per requirement. For example: In UNC, unlike UNF thread gauges
, the basic class is 2A but for finer thread calculation to the setting can be changed to 1A class.
iii. To calculate V- shape
Calculating V shape is very simple only when you have the following data –
Pitch, real pitch, crest flat, crest radius max, root flat, root radius, thread depth and flank length.
iv. To calculate Tolerances
Tolerances are the measurement to calculate the strength. With this, engineers decide which screw is to place where (this is why a small door hinge screw is different from railway track screw). Things you must check are – Allowances, major diameter, pitch diameter, minor diameter and length of engagement.
v. To calculate Lead angle
This determines the slant angle of a screw. Keeping this in mind; here is what you need to know – major diameter, pitch diameter, and minor diameter.
If you want to get the best and most appropriate metric thread gauges for your work, then do not compromise with the quality. Always buy it from the authentic industrial place. Start your engineering creations now!