Gauge family 01 / 11

Metric thread plug & ring gauges, manufactured in Pune.

DIN ISO 1502Metric 60° · DIN ISO 1502 / ANSI ASME B1.16M

A metric thread gauge is a GO / NOT-GO inspection tool that checks whether a metric screw thread, such as M10 × 1.5, is within its tolerance class. Accusize manufactures metric thread plug gauges for internal threads and ring gauges for external threads in Pune, to DIN ISO 1502.

Metric thread plug and ring gauges manufactured to DIN ISO 1502. GO and NOT-GO members verify pitch diameter and functional fit across the full metric range.

Thread plugs

1 – 480 mm

Thread rings

1 – 500 mm

Representative sizes & classes
Diameter	Pitch	Plug class	Ring class
M1	0.25 mm	5H	6h
M2	0.40 mm	6H	6g
M3	0.50 mm	6H	6g
M4	0.70 mm	6H	6g

GO gauge

Enters and passes the complete length of the thread, screwed by hand without excessive force.

NOT-GO gauge

May not enter more than two turns from either end, screwed by hand without excessive force.

Ground on our Matrix thread grinders and verified on TRIMOS H4 before every certificate is issued.

Quote this gauge Ask on WhatsApp

About this gauge

Metric thread gauges: what they are and how to choose

A metric thread plug gauge checks an internal thread such as a tapped hole or a nut. A metric thread ring gauge checks an external thread such as a bolt or a stud. Both are different from a thread pitch gauge (leaf gauge), which only identifies the pitch. A GO / NOT-GO gauge decides whether the thread is actually in tolerance.

Metric threads are specified by diameter, pitch and a tolerance class, commonly 6H for internal and 6g for external threads. Confirm the class on your drawing before ordering, because a tighter class changes the gauge.

Accusize makes standard and special metric thread gauges to drawing, each with a NABL accredited test certificate. We supply across India and take enquiries from outside India.

Common questions

Questions about Metric thread gauges

What are metric thread gauges?

A metric thread gauge is a GO / NOT-GO inspection tool that checks whether a metric screw thread, such as M10 × 1.5, is within its tolerance class.

Which standard does it follow?

Manufactured to DIN ISO 1502.

What range is available?

Available ranges: Thread plugs 1 – 480 mm; Thread rings 1 – 500 mm.

How does GO / NOT-GO acceptance work?

The GO member must enter and pass the complete length of the thread by hand, without excessive force. The NOT-GO member may not enter more than two turns from either end.

What is the difference between a thread plug gauge and a thread pitch gauge?

A thread plug gauge is a GO / NOT-GO limit gauge that decides whether an internal thread is within tolerance. A thread pitch gauge only identifies the pitch of a thread and does not check the tolerance.

Which tolerance class do metric thread gauges use?

Metric gauges are made to the class on your drawing. 6H for internal and 6g for external threads is the most common. Share the class when you request a quote.

Do you supply outside Pune?

Yes. We supply across India and take enquiries from outside India too. See the where we supply page for details.

How do I request a quote?

Share the thread size and standard on our quote page and we will confirm class, availability and pricing within one business day.

Need metric thread gauges?

Share your thread, standard or drawing and get the right acceptance class, certified. We supply across India and take enquiries from outside India too, see where we supply.

Request a quote All products