Is there any way that I can find the method to calibrate my thread plug gauge.

I intend to do it internally (in-house) but I don't have the outer diameter spec and the pitch spec for M2x0.4, M3x0.5 and M5x0.8 type

I wish to have a table of minimum and maximum spec forboth outer diameter and pitch diameter including the wire gauge diameter.

You may want to check Machinery handbook. I believe this book will have the required dimensions and tolerances. There is also a BS standard. You may find the standards reference in the book.

Here is a web page with various pitch diameter table.
Thread Pitch Diameter Table (http://www.ring-plug-thread-gages.com/PDChart/metric_plugs.htm)

If you purchase metric “3 wire set”, you can measure pitch diameter in house using your regular micrometer. (Low cost)

There are more sophisticated measuring equipments like horizontal/ Universal metroscope that can perform more precise measurements,floating carriage micrometers with fiducial indicators.
Regards,
Govind.

Thanks Govind,

But still I have an enquiry.

Normal gauge will wear-and-tear and become worn out after long time usage. They would be a plus or minus on the specification. Please advice

Thanks Govind,

But still I have an enquiry.

Normal gauge will wear-and-tear and become worn out after long time usage. They would be a plus or minus on the specification. Please advice

Yes, if you refer the machinery handbook, BS standards you will notice both manufacturing & Wear allowances for “Go” end and manufacturing allowance for “No Go end”.
Regards,
Govind.

It has been over 20 years since I last did these calculations. I was not able to respond with specific details yesterday night.

Here is a webpage from one of the Indian manufacturer that I have used in the past. This page has lots of standards references.

Thread Standards (http://www.bakergauges.com/HTML/products_ThreadGauges.htm)

Basic Dimension refers to standards pertaining to thread dimensions
Gauging Practice refers to standards pertaining to gauge dimensions (manufacturing, wear allowances)

Hope this helps.

Regards,
Govind.

Is there any way that I can find the method to calibrate my thread plug gauge.

I intend to do it internally (in-house) but I don't have the outer diameter spec and the pitch spec for M2x0.4, M3x0.5 and M5x0.8 type

I wish to have a table of minimum and maximum spec forboth outer diameter and pitch diameter including the wire gauge diameter.

You first need to identify which standard gages have been procured to. British Standards for Gages differ from ANSI/ASME B1 Gage Standards used here in the United States. Also how much is your company willing to invest in inspection equipment and environmental controls to do this calibration?

You’re looking at a Super Mic, Master Gage Block of Grade 0.5 or 1 and a room with a controlled temperature of 68 Degrees F (20 C) for starters.

Thanks for you all, Govind and Jeff.

The details is sufficient enough.:agree1:

Since I'm working with the Japanese company, they are using the JIS standard and I have a lot of trouble to refer on the standard since it has been written in Japanese.

Thanks to you all:agree::thanx: