Bolt Size Chart report

BoltsBolts are one of the most indispensable parts of hardware. We can see or use bolts in many places in daily life. But there are different types and sizes of bolts, and their uses also differ. Do you know how to check the bolt size? However, the surface of most bolts has not been marked with a model number.

Bolts are externally threaded fasteners used with a nut. It will not rotate in the assembly process but is tightened by turning the nut. Nuts and bolts are essential fastenings, critical in the safe assembly of machinery, equipment, furniture, and much more. The right bolt size must be used in most circumstances.

If you are searching for more details about bolt sizes, please continue reading the following articles. This article will provide a complete guide of bolts, which involves bolts definition, dimensions, and the standard bolt sizes chart in metric and imperial.

Bolt Size Guide

Metric nuts and bolts are commonly referenced using 'M' sizes: M3, M8, M12. But the size of a metric fastener is more accurately specified using the diameter, pitch, and length dimensions in millimeters. For nut size, the measurements used are simply diameter and pitch.

For example, metric bolt specification: M8-1.0 x 20.

  • The letter ‘M’ indicates that this bolt uses a metric thread.
  • The number '8' refers to the nominal diameter of the bolt shaft in millimeters.
  • The number 1.0 is the thread pitch of the bolt, which is the distance between threads in millimeters.
  • And the final figure, 20, is the length in millimeters.

bolt sizing

Nominal Bolt Size

The diameter is equal to the external diameter of the threads. The bolt diameter is a little smaller, and the nut diameter slightly larger. But it is easier to specify the components by a single size designation since the bolt and nut are mating components.

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. It is also described as the number of threads per inch.

Length

The length of a metric bolt is measured in the same way as imperial, inch-based bolts and fasteners. Socket head, pan head, button head, and hex head bolts are measured from the underside of the bolt head to the end of the shaft. For flat head bolts, the length includes the bolt head height, and for dome head bolts, the length is measured from the thickest, highest point on the curved head.

Bolt Size Charts

Coarse threads are with a larger pitch, and fine threads are with a smaller pitch. The following metric stud bolt size table is meant to help determine the correct size bolt or nut for your purpose. The bolt size charts provide coarse and fine thread sizes in both US and metric sizes.

bolts and nuts

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

Metric Bolt Dimensions Chart

Check out the standard bolts size chart in metric or imperial below.

Nominal Bolt SizeCourse thread PitchFine thread PitchShank Diameter Max.Width Across Flats Max.Head Thickness Max.
M610.756104.15
M81.2518135.45
M101.51.2510166.58
M121.751.2512187.68
M1421.514218.98
M1621.5162410.18
M202.51.5203012.715
M2432243615.215

Imperial Bolt Dimensions Chart

Nominal Bolt SizeThreads per inch (UNC)Threads per inch (UNf)Shank Diameter Max.Width Across Flats Max.Head Thickness Max.
1/420280.250.4380.163
5/1618240.310.50.211
3/816240.3750.5620.243
7/1614200.440.6250.291
1/21320.0.50.750.323
5/811180.6250.930.403
3/410160.751.120.483
7/89140.8751.310.563
181411.50.627

Hole Sizes for Metric Bolts

The defined diameter of metric bolts is slightly larger than the actual diameter of the bolt shaft. So an M8 bolt would have a shaft diameter that’s a little under 8mm, which means that the bolt should fit through an 8mm hole. The following table provides examples of clearance hole sizes, standard or coarse thread pitches, along fine thread pitches and their corresponding tapping hole sizes.

SizeClearance Hole mmThread Pitch (std)Tapping Drill (std Pitch)Thread Pitch (fine)Tapping Drill (fine pitch)
M55.50.84.2 mm
M66.51.05.0 mm0.755.25 mm
M891.256.75 mm1.07 mm
M10111.58.5 mm1.0 or 1.259.0 or 8.75 mm
M12141.7510.25 mm1.510.5 mm
M16182.014 mm1.516.5 mm
M20222.517.5 mm1.520.5 mm
M24263.021 mm2.022 mm
M30323.526.5 mm2.028 mm

In the above brief guide, we introduce the standard bolt size charts, which will hopefully help dispel any confusion.


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