Contact Us

888-315-0175

We Offer Expert Mobile Calibration Services

RAD Torque Presents: 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 stud sizes.

Download Printable Version
Name(Required)

Coarse Thread Bolts

NOM.
DIA.
PITCH
mm
DIAMETER
mm
DIAMETER
inch
NUT
Size
M101.5100.393717
M121.75120.472419
M142140.551222
M162160.629924
M182.5180.708727
M202.5200.787430
M222.5220.866132
M243240.944936
M273271.06341
M303.5301.181146
M333.5331.299250
M364361.417355
M394391.535460
M424.5421.653565
M454.5451.771770
M485481.889875
M525522.047280
M565.5562.204785
M605.5602.362290
M646642.519795
M686682.6772100
M726722.8346105
M766762.9921110
M806803.1496115
M856853.3464120
M906903.5433130
M10061003.937145
M11061104.3307155
M12561254.9212180
M14061405.5118200
M16061606.2992230

Fine Thread Bolts

NOM.
DIA.
PITCH
mm
DIAMETER
mm
DIAMETER
inch
NUT
Size
M161.5160.629924
M182180.708727
M181.5180.708727
M202200.787430
M201.5200.787430
M222220.866132
M221.5220.866132
M242240.949936
M241.5240.949936
M272271.06341
M271.5271.06341
M302301.181146
M301.5301.181146
M332331.299250
M331.5331.299250
M363361.417355
M361.5361.417355
M393391.535460
M423421.653565
M453451.771770
M483481.889875
M523522.047280
M564562.204785
M604602.362290
M644642.519795
M684682.6772100
M724722.8346105
M764762.9921110
M804803.1496115
M854853.3464120
M904903.5433130
M10041003.9370145
M11041104.3307155
M12541254.9212180

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.

Call our bolting experts at 888-315-0175 with any torque questions.