Metric Stud Bolt To Nut Size Chart

Our metric stud bolt to nut table is meant to help determine the correct size bolt or nut for your purpose. Definitions of terms are located below the chart. Use the dimensions of your bolt to determine the appropriate size nut. The bolt chart provides both US and metric sizes.

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Coarse Thread

NOM.
DIA.
PITCH
mm
DIAMETER
mm
DIAMETER
inch
NUT
Size
M10 1.5 10 0.3937 17
M12 1.75 12 0.4724 19
M14 2 14 0.5512 22
M16 2 16 0.6299 24
M18 2.5 18 0.7087 27
M20 2.5 20 0.7874 30
M22 2.5 22 0.8661 32
M24 3 24 0.9449 36
M27 3 27 1.063 41
M30 3.5 30 1.1811 46
M33 3.5 33 1.2992 50
M36 4 36 1.4173 55
M39 4 39 1.5354 60
M42 4.5 42 1.6535 65
M45 4.5 45 1.7717 70
M48 5 48 1.8898 75
M52 5 52 2.0472 80
M56 5.5 56 2.2047 85
M60 5.5 60 2.3622 90
M64 6 64 2.5197 95
M68 6 68 2.6772 100
M72 6 72 2.8346 105
M76 6 76 2.9921 110
M80 6 80 3.1496 115
M85 6 85 3.3464 120
M90 6 90 3.5433 130
M100 6 100 3.937 145
M110 6 110 4.3307 155
M125 6 125 4.9212 180
M140 6 140 5.5118 200
M160 6 160 6.2992 230

Fine Thread

NOM.
DIA.
PITCH
mm
DIAMETER
mm
DIAMETER
inch
NUT
Size
M16 1.5 16 0.6299 24
M18 2 18 0.7087 27
M18 1.5 18 0.7087 27
M20 2 20 0.7874 30
M20 1.5 20 0.7874 30
M22 2 22 0.8661 32
M22 1.5 22 0.8661 32
M24 2 24 0.9499 36
M24 1.5 24 0.9499 36
M27 2 27 1.063 41
M27 1.5 27 1.063 41
M30 2 30 1.1811 46
M30 1.5 30 1.1811 46
M33 2 33 1.2992 50
M33 1.5 33 1.2992 50
M36 3 36 1.4173 55
M36 1.5 36 1.4173 55
M39 3 39 1.5354 60
M42 3 42 1.6535 65
M45 3 45 1.7717 70
M48 3 48 1.8898 75
M52 3 52 2.0472 80
M56 4 56 2.2047 85
M60 4 60 2.3622 90
M64 4 64 2.5197 95
M68 4 68 2.6772 100
M72 4 72 2.8346 105
M76 4 76 2.9921 110
M80 4 80 3.1496 115
M85 4 85 3.3464 120
M90 4 90 3.5433 130
M100 4 100 3.9370 145
M110 4 110 4.3307 155
M125 4 125 4.9212 180

DEFINITIONS

NOMINAL DIAMETER (NOMINAL BOLT DIAMETER)
The diameter equal to the external diameter of the threads or the overall diameter of the part. (Nominal diameter is more of a label than a size. For example, a bolt and nut may be described as being ½” diameter. But neither the external threads of the bolt nor the internal threads of the nut are exactly .500 in diameter. In fact, the bolt diameter is a little smaller and the nut diameter a little larger. But it is easier to specify the components by a single size designation since the bolt and nut are mating components.)

PITCH (THREAD PITCH)
Pitch is the distance from the crest of one thread to the next or the distance from one thread groove to the next, measured from crest to crest. Pitch is also described as the number of threads per inch.

DIAMETER (BODY DIAMETER)
The smallest or largest pitch diameter that fits onto a screw or into a nut, including all of the form deviations such as lead, thread angle, taper, and roundness. Functional diameter is a measure of the ability to assemble the thread.

THREAD (BOLT THREADS)
A raised, helical rib or ridge around the interior or exterior of a cylindrically shaped object. Threads are found on screws, nuts, and bolts.

THREADS PER INCH
The decimal equivalent of the number of threads in an inch.

COARSE THREADS & FINE THREADS
Coarse threads are those with larger pitch (fewer threads per axial distance), and fine threads are those with smaller pitch (more threads per axial distance). Coarse threads have a larger threadform relative to screw diameter, whereas fine threads have a smaller threadform relative to screw diameter.

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