INSIZE Thread Plug Gauges Now Available from Great Lakes Carbide Supply

When thread quality matters, guessing is expensive. Whether you are checking tapped holes in production, verifying incoming parts, or tightening up inspection procedures, INSIZE thread plug gauges offer a practical and reliable way to confirm thread accuracy before parts leave the shop floor.

Great Lakes Carbide Supply now offers INSIZE precision thread plug gauges in both Metric and American Standard / Unified National sizes, available across a wide range of common shop threads.

What Are Thread Plug Gauges Used For?

Thread plug gauges are used to inspect internal threads. A typical set includes both a Go and No-Go gauge:

The Go gauge confirms that the thread is within the minimum acceptable limit and should enter the threaded hole smoothly.

The No-Go gauge checks the upper limit and should not fully enter the thread.

Together, these gauges help confirm that a tapped hole is functional, consistent, and within specification.

INSIZE Metric Thread Plug Gauges

INSIZE metric thread plug gauges are supplied as complete Go and No-Go sets and are made to ISO1502 standards. Each set is supplied with a manufacturer inspection certificate.

Available metric sizes include common coarse metric threads from small precision sizes up through larger industrial sizes, including examples such as:

M2 × 0.4
M3 × 0.5
M4 × 0.7
M5 × 0.8
M6 × 1.0
M8 × 1.25
M10 × 1.5
M12 × 1.75
M16 × 2.0
M20 × 2.5
M24 × 3.0
M30 × 3.5
M36 × 4.0

These gauges are well suited for machine shops, maintenance departments, fabrication shops, quality control rooms, and manufacturers working with metric fasteners or tapped components.

INSIZE American Standard Thread Plug Gauges

INSIZE American Standard thread plug gauges are available for common Unified National thread forms and are made to ANSI/ASME B1.2 standards. Like the metric gauges, these are supplied as Go and No-Go sets with a manufacturer inspection certificate.

Available UN thread options include common UNC, UNF, and UNEF sizes, including examples such as:

No. 0-80 UNF
No. 4-40 UNC
No. 6-32 UNC
No. 8-32 UNC
No. 10-24 UNC
No. 10-32 UNF
1/4-20 UNC
1/4-28 UNF
5/16-18 UNC
3/8-16 UNC
3/8-24 UNF
1/2-13 UNC
1/2-20 UNF
5/8-11 UNC
3/4-10 UNC
7/8-9 UNC
1-8 UNC
1-14 UNS

These gauges are a strong fit for shops working with North American fastener standards, repair work, production machining, inspection departments, and mixed metric/imperial manufacturing environments.

Other Thread Gauge Options

In addition to standard metric and American thread plug gauges, other gauge types may be available, including:

Metric Fine
Aerospace MJ
UNJ
STI
Petroleum thread gauges
Matching ring gauges

For less common thread forms or specialty applications, contact Great Lakes Carbide Supply and we can help check availability.

Why Buy INSIZE Thread Gauges from GLCS?

Great Lakes Carbide Supply serves customers across Canada from Ontario and Alberta. We support machinists, purchasing teams, maintenance departments, and manufacturers with practical tooling and inspection solutions.

INSIZE thread gauges are a cost-effective way to bring more confidence to your thread inspection process without overcomplicating the job. They are easy to use, clearly marked, and available in many of the sizes Canadian shops use every day.

Need Thread Gauges?

Contact Great Lakes Carbide Supply for pricing, availability, and support selecting the right INSIZE thread plug gauges for your application.

Great Lakes Carbide Supply Inc.
Serving all of Canada from Ontario & Alberta
519-391-0732
info@greatlakescarbidesupply.com