Thread measure  or Thread determine in 3 steps

 

In order to be able to measure a thread or determine the thread, you need a thread gauge, also called a thread template, and a caliper gauge. With these two measuring tools it is quick and easy to measure a thread and then the thread size can be determined exactly. Two pieces of information are necessary to determine the thread size. The diameter (for screws the outer diameter and for nuts the inner diameter) and the thread pitch. The thread pitch is the distance between two thread tips measured in mm. For inch threads, the thread pitch is the number of threads per inch (25.4mm) of thread length.

 

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Which thread do I have?

We show you here how to measure the thread size or determine the thread. In three simple steps you will quickly get the result.

  1. Thread diameter measurement
  2. Measure thread pitch
  3. Determine thread according to thread table

Step 1: Measure thread diameter or measure thread size

Determine thread diameter, determine thread type, measure thread
Thread diameter measurement

 

If you want to measure the thread diameter, the first step is to determine the diameter or inner diameter of the thread with the caliper gauge. Via the diameter you can now determine whether it is an inch thread or a metric thread. 1 inch = 25.4mm. In the table below you can find out the thread diameter and thus determine which thread it is.

 

 

Step 2: Measure thread pitch or determine thread pitch

Determine thread, measure thread, thread template, thread gauge, determine thread type
Measure thread pitch with a thread template or thread gauge

 

 

If you want to measure the thread pitch or determine the thread pitch, a thread gauge or thread template is used. You check with the individual thread templates until you have found exactly the one that fits exactly into the thread. See the picture on the left below. You can now read off the exact thread pitch from the template. The thread pitch is thus exactly determined.

 

A thread gauge is shown in the picture at the top left. Below is shown as an example of how to correctly apply the thread gauge.

 

Once you have determined the thread pitch, you go to the next step, you need to measure the thread size or you need to determine the thread diameter.

 

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Step 3: Determine thread according to the "Measure thread" table

 

In the table below, you will find the thread diameter and the thread pitch for all common thread sizes. You can thus determine the thread size in the thread table. If you want to determine a screw or simply determine the thread type, you can also specify as described above and determine the exact data in the table. In the first "Measure thread table", you will find the technical data for metric threads M1 to M60. In the second table below, for inch UNC thread.

 

Metric thread sizes table

 

Thread measure table

Metric threads M1 to M60

 

Thread size: Thread pitch in mm:

Thread diameter in mm:

(nominal thread diameter)

M1

0,25 1,00

M1.2

0,25 1,20

M1.4

0,30 1,40

M1.6

0,35 1,60

M1.7

0,35 1,70

M1.8

0,35 1,80

M2

0,40 2,00
M2.3 0,40 2,30
M2.5 0,45 2,50
M2.6 0,45 2,60
M3 0,50 3,00
M3.5 0,60 3,50
M4 0,70 4,00
M5 0,80 5,00
M6 1,00 6,00
M7 1,00 7,00
M8 1,25 8,00
M9 1,25 9,00
M10 1,50 10
M11 1,50  11
M12 1,75 12

M14

2,00 14
M16 2,00 16
M18 2,50 18
M20 2,50 20
M22 2,50 22
M24 3,00 24
M27 3,00 27
M30 3,50 30
M33 3,50 33
M36 4,00 36
M39 4,00 39
M42 4,50 42
M45 4,50 45
M48 5,00 48
M52 5,00 52
M56 5,50 56
M60 5,50 60

*All data without guarantee.

UNC thread sizes table

 

Thread measure table

UNC (coarse thread) Flank angle 60°

 

Inch

as fractional value

Gear number

per inch (inch)

Thread diameter in mm

(nominal thread diameter)

Nr. 00 (UNC 00-90) 90 1,194 mm
Nr. 1 (UNC 1-64) 64 1,854 mm
Nr. 2 (UNC 2-56) 56 2,184 mm
Nr. 3 (UNC 3-48) 48 2,515 mm
Nr. 4 (UNC 4-40) 40 2,845 mm
Nr. 5 (UNC 5-40) 40 3,175 mm
Nr. 6 (UNC 6-32) 32 3,505 mm
Nr. 8 (UNC 8-32) 32 4,166 mm
Nr. 10 (UNC 10-24) 24 4,826 mm
Nr. 12 (UNC 12-24) 24 5,486 mm
1/64"   0,397 mm
1/32"   0,794 mm
1/16"   1,588 mm
1/8"   3,175 mm
1/4" 20 6,350 mm
5/16" 18 7,938 mm
3/8" 16 9,525 mm
7/16" 14 11,112 mm
1/2" 13 12,700 mm
9/16" 12 14,288 mm
5/8" 11 15,875 mm
11/16" 11 17,462 mm
3/4" 10 19,050 mm
13/16" 10 20,638 mm
7/8" 9 22,225 mm
15/16" 9 23,812 mm
1" 8 25,400 mm
1 1/8" 7 28,575 mm
1 1/4" 7 31,750 mm
1 3/8" 6 34,925 mm
1 1/2" 6 38,100 mm
1 9/16"   39,688 mm
1 5/8" 5 41,275 mm
1 3/4" 5 44,450 mm
2"   50,800 mm
2 1/4"   57,150 mm
2 1/2"   63,500 mm

* All data without guarantee.

UNF thread sizes table

 

UNF inch thread table

UNF (fine thread) flank angle 60°

 

Technical data:

Tightening torque

Torque component in (Nm)

Inch

as fractional value

Gear number

per inch (inch)
Thread Ø
outside in (mm)

Grade 1

(corresponds to approx. 4.6)

Grade 2

(corresponds to approx. 5.6)

Grade 5

(corresponds to approx. 8.8)

Grade 8

(corresponds to approx.ca.10.9)

Nr. 000 (UNF 000-120) 120 0,864 mm        
Nr. 00 (UNF 00-96) 96 1,194 mm        
Nr. 0 (UNF 0-80) 80 1,524 mm        
Nr. 1 (UNF 1-72) 72 1,854 mm        
Nr. 2 (UNF 2-64) 64 2,184 mm        
Nr. 3 (UNF 3-56) 56 2,515 mm        
Nr. 4 (UNF 4-48) 48 2,845 mm        
Nr. 5 (UNF 5-44) 44 3,175 mm        
Nr. 6 (UNF 6-40) 40 3,505 mm        
Nr. 8 (UNF 8-36) 36 4,166 mm        
Nr. 10 (UNF 10-32)

32

4,763 mm        
Nr. 12 (UNF 12-28) 28 5,486 mm        
1/64"   0,397 mm        
1/32"   0,794 mm        
1/16"   1,587 mm        
1/8"   3,175 mm        
1/4" 28 6,350 mm 4 7 11 16
5/16" 24 7,938 mm 9 14 23 33
3/8" 24 9,525 mm 16 26 41 58
7/16" 20 11,112 mm 26 41 65 92
1/2" 20 12,700 mm 39 62 100 141
9/16" 18 14,288 mm 56 88 142 201
5/8" 18 15,875 mm 79 123 199 282
11/16"   17,462 mm        
3/4" 16 19,050 mm 137 216 348 494
13/16"   20,638 mm        
7/8" 14 22,225 mm 217 290 556 786
15/16"   23,812 mm        
1" 12 25,400 mm 332 442 848 1199
1 1/8" 12 28,575 mm 471 626 1201 1696
1 1/4" 12 31,750 mm 655 873 1673 2365
1 3/8" 12 34,925 mm 883 1177 2255 3187
1 1/2" 12 38,100 mm 1158 1543 2959 4181
1 9/16"   39,688 mm        
1 5/8"   41,275 mm 1485 1980 3794 5362
1 3/4"   44,450 mm 1869 2491 4776 6747
2"   50,800 mm 2823 3764 7215 10194
2 1/4"   57,150 mm 4057 5410 10369 14653
2 1/2"   63,500 mm 5608 7477 14332 20251

 

You can find more information about inch thread here.

 

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