Thread Gages | Gage Assembly
1-800-232-4243 (GAGE)
Thread Gages2020-09-21T14:54:05-05:00

Thread Gage Manufacturer

Gage Assembly was established in 1953. We manufacture standard and special thread plug and thread ring gages for virtually every type of thread. American inch, metric thread gages, acme, buttress, straight and tapered pipe thread gages, left hand, pre-plate, whitworth, multiple lead thread plug, and thread rings are all available. Size capabilities run from 000-120 threads per inch to 15 ½ inch diameter and one thread per inch.

Do you have a part with an odd external or internal thread size or special pitch diameter? Gage Assembly Company can help. Gage Assembly offers standard gages in stock and fast delivery on special-order thread gages, including adjustable thread rings and thread setting plugs. Get a quote here.

At Gage Assembly, we produce some of the finest gages on the market.

Are you looking for that extra treatment to ensure your gages last as long as possible?
Ask about our hard chrome plating services for our gages.

Frequently Asked Questions About Thread Gages

What is a thread gage?
Fixed limit thread gages are designed to simply tell you if your threaded component is in or out of tolerance.

What is a thread plug gage?
Thread plug gages check the internal thread of a threaded part. The “Go” plug gage should enter the threaded part. The “Not Go” should not enter the part. This simple process confirms the part is in tolerance. This applies for both metric and American inch sizes.

How do I check an external thread on my part?
External threads are checked using thread ring gages. Thread ring gages may be solid or adjustable design. The “Go” thread ring should allow the external threaded part to enter. The “Not Go” thread ring should not allow the external threaded part to enter. This simple process confirms the part is in tolerance. This applies for both metric and American inch sizes.

Can I check an internal threaded hole with a thread setting plug?
No. A thread setting plug is used only to set thread ring gages of the same size and pitch diameter.

How Thread Gages are Made

Other Gage Assembly Products

Find Your Right Gage and Order Today

Nominal Size Handle Size
.060   0 – 80 000
.073   1 – 64 000
.073   1 – 72 000
.086   2 – 56 000
.086   2 – 64 000
.099   3 – 48 000
.099   3 – 56 000
.112   4 – 40 00
.112   4 – 48 00
.125   5 – 40 00
.125   5 – 44 00
.138   6 – 32 00
.138   6 – 40 00
.164   8 – 32 0
.164   8 – 36 0
.190   10 – 24 0
.190   10 – 32 0
.216   12 – 24 0
.216   12 – 28 0
1/4 – 20 1
1/4 – 28 1
5/16 – 18 1
5/16 – 24 1
3/8 – 16 2
3/8 – 24 2
7/16 – 14 2
7/16 – 20 2
1/2 – 13 2
1/2 – 20 2
9/16 – 12 3
9/16 – 18 3
5/8 – 11 3
5/8 – 18 3
3/4 – 10 3
3/4 – 16 3
7/8 – 9 4
7/8 – 14 4
1 – 8 4
1 – 12 4
1 – 14 4
1-1/8 – 7 4
1-1/8 – 12 4
1-1/4 – 7 5
1-1/4 – 12 5
1-3/8 – 6 5
1-3/8 – 12 5
1-1/2 – 6 5
1-1/2 – 12 5
Nominal Size Handle Size
M   1.6 x 0.35 000
M   2 x 0.4 000
M   2.5 x 0.45 000
M   3 x 0.5 00
M   3.5 x 0.6 00
M   4 x 0.7 0
M   5 x 0.8 0
M   6 x 1.0 1
M   8 x 1.25 1
M   8 x 1.0 1
M   10 x 1.5 2
M   10 x 1.25 2
M   10 x 1.0 2
M   10 x 0.75 2
M   12 x 1.75 2
M   12 x 1.5 2
M   12 x 1.25 2
M   12 x 1.0 2
M   14 x 2.0 3
M   14 x 1.5 3
M   15 x 1.0 3
M   16 x 2.0 3
M   16 x 1.5 3
M   17 x 1.0 3
M   18 x 1.5 3
M   20 x 2.5 3
M   20 x 1.5 3
M   20 x 1.0 3
M   22 x 2.5 4
M   22 x 1.5 4
M   24 x 3.0 4
M   24 x 2.0 4
M   25 x 1.5 4
M   27 x 3.0 4
M   27 x 2.0 4
M   30 x 3.5 5
M   30 x 2.0 5
M   30 x 1.5 5
M   33 x 2.0 5
M   35 x 1.5 5
M   36 x 4.0 5
M   36 x 2.0 5
M   39 x 2.0 5-1/2

Inch

Nominal Size Handle Size
12 – 32 0
1/4 – 32 1
5/16 – 32 1
3/8 – 32 2
7/16 – 28 2
1/2 – 28 2
9/16 – 24 3
5/8 – 24 3
11/16 – 24 3
3/4 – 20 3
13/16 – 20 3
7/8 – 20 4
15/16 – 20 4
1 – 20 4
1-1/16 – 18 4
1-1/8 – 18 4
1-3/16 – 18 5
1-1/4 – 18 5
1-5/16 – 18 5
1-3/8 – 18 5
1-7/16 – 18 5
1-1/2 – 18 5
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