Metric Bolt Head/Wrench Size
| Bolt Diameter (mm) | Head/Wrench Size (mm) | Head/Wrench Size (mm) | Head/Wrench Size (mm) | Head/Wrench Size (mm) |
| ANSI/ISO | DIN | JIS | DIN/ISO Heavy Hex | |
| 4 | 7 | 7 | 7 | - |
| 5 | 8 | 8 | 8 | - |
| 6 | 10 | 10 | 10 | - |
| Size | Clearance Hole mm | Tapping Drill (std Pitch) |
|---|---|---|
| M10 | 11 | 8.5 mm |
| M12 | 14 | 10.25 mm |
| M16 | 18 | 14 mm |
| M20 | 22 | 17.5 mm |
How do you measure the size of a bolt?
Method 2 Method 2 of 3: Finding the Thread Pitch Download Article
- Turn your bolt gauge over to find the thread gauge. ...
- Rub the bolt on different sized thread gauges. Run the threads of the bolt along the thread gauge of the appropriate type (standard or metric).
- Stop when the thread gauge grabs the threads of the bolt. ...
- Make a note of the thread pitch. ...
What do the numbers in a bolt size mean?
What do bolt numbers mean?
- Read the first letter of the size. This the largest diameter: the measurement of the screw on the thread.
- Read the second number. This is either the number of threads per unit of the distance between threads; also known as the "thread pitch".
- Read the third number, generally the one following the "x."
What is the most common bolt size?
Common Bolt Sizes. The most common sizes for wheel lug nuts are 7/16-inch, 1/2-inch, 9/16-inch, 5/8-inch, 12 mm, and 14 mm. In addition to these sizes, automotive engines may also have 1/4-inch, 5/16-inch, and 3/8-inch bolts. 1/4-Inch Impact Wrench
What is the standard size of a bolt?
Metric bolts are referenced using “M” sizes, such as the M8 bolt size. The size of a metric bolt is specified using pitch, diameter, and length in millimeters. For example, in M8-1.0*20, the “M” means the Metric thread designation, the digit 8 refers to the Nominal diameter (in millimeters), 1.0 refers to the pitch, and 20 refers to the length.
What size is a 10 mm bolt?
Metric Shoulder Bolt DimensionsShoulder Diameter (A)Thread (C)Head Diameter (E)6mm5mm x 0.810mm8mm6mm x 1.013mm10mm8mm x 1.2516mm12mm10mm x 1.518mm3 more rows
What size is M6 in MM?
6 mmM6 refers to a metric 6 mm screw. The outside diameter of the threads is 6 mm. The standard metric rack screw is actually an M6 x 0.1 mm. The number 0.1 mm refers to 0.1 threads per millimeter.
What size is a 16mm bolt?
Metric bolts are made fractionally under their stated size, for instance an M16 bolt will have a shank diameter of typically 15.97mm. This means that a 16mm bolt will fit through a 16mm hole but to allow for misalignment between parts it is common practice to drill bolt holes slightly larger.
Is M6 or M8 bigger?
The size of a metric screw or bolt is specified as diameter, pitch and length, in millimeters (millimeters is abbreviated "mm"). For nuts, size will appear as diameter and pitch....Table 3.MetricClosest InchM6-1.01/4-28 (Larger)M7-1.01/4-28 (Smaller)M8-1.255/16-18 (Smaller)M10-1.53/8-16 (Smaller)16 more rows
What is M in bolt size?
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.
What size is an M8 bolt in mm?
Dimensions for DIN931 Hex Head BoltDiameter (d)PitchAcross Flats (s)M50.8mm8mmM61.0mm10mmM71.0mm11mmM81.25mm13mm17 more rows
What is M12 bolt size?
M12 bolts are a metric sized bolt with a 12mm thread diameter. They have many applications but are often used to fasten metal to wood or to join different types of timber together.
What size is a 20mm bolt?
Metric Hex Bolt DimensionsNOMINAL SIZE (D)BODY DIAMETERm1414.0013.73m1616.0015.73m2020.0019.67m2424.0023.6713 more rows•Jul 2, 2015
Does M10 mean 10mm?
If the size is M10 x 25, that would mean that the diameter is 10 mm.
How do you read bolt sizes?
0:212:23How to Measure Screws & Bolts - US & Metric Sizing | Fasteners 101YouTubeStart of suggested clipEnd of suggested clipSo when you read a bolt that says quarter 20 by 2 that means quarter inch diameter 20 TPI that'sMoreSo when you read a bolt that says quarter 20 by 2 that means quarter inch diameter 20 TPI that's threads per inch which would be here.
What size is a 8.8 bolt?
The diameter of the 8.8 Jh Bolt range from 20mm to 100mm. They can come with different finishes as well. The zinc plated, hot dip galvanized and plain finishes are available for different application needs. The 8.8 Metric Bolt is one of the standards adopted.
What do bolt size numbers mean?
The number 1 or number larger than one, or number one or number larger than one followed by a fraction, is the diameter of the shaft. The number following the hyphen is the number of threads per inch; that is, the number of threads on the shaft itself, per inch of shaft length. Same as for smaller parts.
What is pitch in bolts?
But it is easier to specify the components by a single size designation since the bolt and nut are mating components.) 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.
What is nominal diameter?
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.
How do you determine screw size?
When looking into and determining screw size, there are two things you need to understand – the length and the thread count. The latter is also commonly referred to as threads per inch (TPI) or thread pitch. We use the TPI to determine the thread’s fineness. The number will also tell if a screw can thread through a bolt.
How do I identify screw size?
Identifying sizes can be tricky if you don’t know how to read them. They are represented in an alphanumeric code, which is difficult to understand if you are not familiar with it. Codes such as “1/8-10 x 4/6”, “M5-0.4 x 15”, and “4-30 x 0.10” may seem overwhelming and meaningless at the same time, but it is the most vital information.
What do the numbers mean on screw sizes?
If you often do DIY, one of the popular items you are using is screws. It comes in several sizes, which you can find in the packaging. Finding the correct size can be a daunting task if you don’t know the imperial or metric system. A conversion table would be handy if you often convert between these two systems.
Metric System
The metric system was based on the meter, a system of measurement whose origin was in France in the 1970s. When taking the length of a screw, we use meters.
Standard System
The standard system, otherwise known as the imperial system, was introduced in the British Weights and Measures Act 1824. It evolved through a series of amendments in the said act. For some time, the imperial system had been the standard measurement system. However, by the late 20th century, several countries have adopted the metric system.
Buying Guide
Now that we have discussed some of the basics, it is time to guide you through what you need to know. Finding the right type and specifications will hold materials together nicely.
Types
Depending on the application, they come in different forms and sizes. Here are some of the most common ones.
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