Coarse Thread Bolts
| 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 |
- 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 are the common metric bolt sizes?
- Diameter: the larger the number, the larger the fastener
- Pitch: the larger the number, the more coarse the thread (the fewer the threads per unit of measure); coarse is the most common metric thread and is assumed when pitch ...
- Length: the larger the number, the longer the fastener
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
How to read bolt measurements?
Read the next number to figure out the screw’s pitch.
- A M12 x 1.75 x 85 screw, for instance, has threads every 1.75 mm (0.069 in). The second number, 1.75, indicates the pitch.
- The metric labeling system doesn’t label coarse or fine screws, so you have to pay attention to the pitch. ...
- If you don’t see a pitch size listed, assume that you have a coarse screw. ...
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 do the numbers on metric bolts mean?
Taking a closer look at this description, let's explore its meaning: M = This designates the fastener is a metric size. 10 = The nominal diameter in millimeters. 1.0 = The thread pitch, or distance between threads, in millimeters. 20 = The fastener's length, in millimeters.
How are metric bolt sizes measured?
Fastener length is measured from where the material surface is assumed to be, to the end of the fastener. For fasteners where the head usually sits above the surface, the measurement is from directly under the head to the end of the fastener.
How are metric bolts labeled?
Metric fastener threads are also specified according to thread pitch, which is the distance between adjacent threads, again in millimeters. This is represented by the last number in a metric bolt's designation. For example, a bolt labeled M10 x 1.5 is a metric bolt with a 10 mm diameter and 1.5 mm between threads.
Does M10 mean 10mm?
Steel bolt with M10 metric thread. Metric threads are designated with a capital M plus an indication to their nominal outer diameter and their pitch: This bolt is M10 x 1.5 - which means the outside diameter is 10mm and the threads are 1.5mm apart (the most common thread pitch for M10).
How do I know if I have a M6 or M8 bolt?
The defined diameter of metric bolts is actually slightly larger than the actual diameter of the bolt shaft. So an M8 bolt would have a shaft diameter that's slightly under 8mm which means that the bolt should fit through an 8mm hole.
How do you read bolt specs?
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 does 8.8 mean on a metric bolt?
So, in English, a Property Class 8.8 bolt is a bolt with a nominal tensile strength of 800 MPa and a nominal yield strength that is 80% of that nominal tensile strength, so 640 MPa.
What does M14 mean on a bolt?
Metric Bolt DiameterThread PitchMetric Bolt DiameterM6M14Coarse Thread Pitch (mm)1.02.0Fine Thread Pitch (mm).751.5Extra Fine Thread (mm)
What does m12x1 25 mean?
M12 x 25 = 12 mm diameter, coarse thread is assumed (1.75 mm), 25 mm long. M12 is a matching coarse threaded nut. (To avoid confusion, we always include the thread pitch for both coarse and fine metric fasteners.)
What does M10x1 5 mean?
Understanding Inch & Metric Thread Callouts For example, an M10x1. 5 (coarse) thread has a 1.5mm pitch, while an M10x1. 25 (fine) thread has a 1.25mm pitch. To simplify metric thread callouts, the international (ISO) standard for metric threads eliminates the pitch callout on coarse threads.
What is M12 in mm?
Tap sizeBasic major dia (mm)Basic major dia (inch)M10 x 1.2510mm.3937M12 x 1.7512mm.4724M12 x 1.2512mm.4724M14 x 214mm.551224 more rows
What size bolt fits a 10mm nut?
Spanner and Allen Key SizesSizeSpannerAllen KeyM58 mm4 mmM610 mm5 mmM813 mm6 mmM1017 mm8 mm5 more rows
What is the size of a metric screw?
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. There is an exception though—if pitch isn't specified, the fastener is coarse threaded. Consider this size….
How to tell threads per inch?
Inch fasteners are described as threads per inch, which is sometimes mistakenly called pitch. If you need to know the threads per inch of a metric fastener, first convert pitch from millimeters to inches (multiply by 0.03937), then divide 1 by that number. Or, use the table below…. Table 1.
What is M12 thread?
M12 is a matching coarse threaded nut. (To avoid confusion, we always include the thread pitch for both coarse and fine metric fasteners.) If you normally work with inch fasteners, pitch can be a little confusing—pitch is the distance between adjacent threads. In the example above, a pitch of 1.0 means that from one thread to the next thread, ...
What is the difference between pitch and length?
Length: the larger the number, the longer the fastener.
Is metric thread coarse or fine?
Fine metric fasteners can be more or less fine, depending on size. Coarse is the most common metric thread and, as we've mentioned, coarse is assumed when pitch isn't specified. See the table below…. Table 2. Comparison of metric and inch fastener threads. Size. Series. Thread. Pitch.
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.
What is the diameter of a bolt?
Also called Major diameter. The diameter of a bolt is the Shank diameter , expressed in millimetres for Metric bolts. Because this is approximately the same as the Major or Thread diameter the thread diameter measurement can be used for fully threaded bolts.
What is the thread pitch of a metric fastener?
Metric fasteners are specified with a thread pitch instead of a thread count. The thread pitch is the distance between threads expressed in millimetres (measured along the length of the fastener). For example a thread pitch of 1.5 means that the distance between one thread and the next is 1.5mm. In general smaller fasteners have finer thread so they have lower thread pitch.
Where is the length of a fastener measured?
Fastener length is measured from where the material surface is assumed to be, to the end of the fastener. For fasteners where the head usually sits above the surface, the measurement is from directly under the head to the end of the fastener.
What is the metric bolt size?
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. Sometimes, the pitch is omitted in the abbreviated format, such as M8-20, this means the bolt has a coarse thread. The bolt dimension can also be expressed in imperial units.
What is a bolt?
Bolts are a type of essential fastener that often assembled with nuts. Using a bolt with the right sizes is vital for jobs in various machinery and equipment. In this article, we’ll go through a complete guide of bolts, which involves bolts definition, types, dimensions explain, and the standard bolt sizes chart in metric and imperial.
Why are hex bolts used?
Hex bolts can be used for infrastructure that requires a strong fastener with high tensile strength properties, they can also be used in tight spaces with limited access because tools can access them from all angles, or fastening wood, steel, or other materials in bridges, buildings, and more construction projects.
What are hexagonal bolts made of?
Steel is one of the most common materials of bolts, but hex bolts may also be made with aluminum, copper, brass, titanium, or even plastic.
What is an anchor bolt?
Anchor bolt. With a threaded part in one end and non-threaded in another end, which can be made in L shape, Pin type, Wedge type, or other forms, often work with steel plates or stiffeners to connect structural and non-structural elements to the concrete, transfer tension forces and shear forces. Anchor bolts come in different types based on ...
What is the diameter of a M8 bolt?
The defined diameter of metric bolts is actually slightly larger than the actual diameter. So an M8 bolt would have a diameter that’s slightly under 8mm. 2.
What is an elevator bolt?
Elevator bolt. Similar to the carriage bolt but elevator bolt with a thin flat or countersunk head and a square undercut, used in conveyor system setups. The head diameter of elevator bolts is larger than other types, which can prevent the bolt from going through soft conveyor material.
What does it mean when a bolt is metric?
With an imperial bolt the more lines you have the higher the tensile the stronger the bolt. With the metric bolts the higher the number, the higher the tensile, the higher the strength.
How to tell metric and imperial bolts?
Telling the difference between a metric and imperial (inches) bolt is easy. If the bolt has lines on the head its standard or imperial. If the bolt has numbers on the head then it is metric. These markings indicate how strong the bolt is they call this tensile strength.
What is the main use of a metric ruler?
The main use of a metric ruler, is that if you divide the indicated number by 4, you get HO scale feet directly. That's what they're used for. Although inductances, capacitances, pressure and stress are measured in cms, you really can't use a ruler without some other construction to do these things. 1K views.
How to calculate metric tonne?
For the one that is larger than the kilogram, the metric tonne, multiply kilograms by 1000. From grams to kilograms, and from kilograms to tonnes, multiply by 1000. For the units of length; we use the metre as the standard unit of. Continue Reading.
How to tell if you need a metric or imperial spanner?
Bolts are classified by the diameter of the thread not the diameter of the head of the bolt. Now just by looking at the bolt head you’ll know whether you need a metric spanner or an imperial spanner.
What is the standard unit of measurement for mass?
The standard unit of measurement of mass is the kilogram. If you want to convert pounds to kilograms, and this is an approximate, divide by 2.2. The unit smaller than a kilogram is a gram. You just divide by 1000. For the one that is larger than the kilogram, the metric tonne, multiply kilograms by 1000.
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.
