Bolts and screws are integral parts of fastening or putting together things. Several people assume that these two materials are the same, but they are different. Physically, they look similar. They are still unique fasteners in terms of application.
Screws are very versatile, making them a popular choice among people. The threads provide a sturdy grip, allowing them to meet the requirements of any project. They come in several types and sizes, which you can use in metal and wood. Other types are used for drywall and concrete. Screws are self-tapping, but you still have the option to drill a hole for it. Should you decide to go with the latter, it is less time-consuming to drill all holes first before installing the screws.
Summary
Metric & Standard Bolt & Sc...
Metric & standard bolt screw sizes are determined by length and thread count. The easiest way to figure those out is to consult our screw size chart below. However, here’s a quick overview from the chart:
- The M2 screw size has a diameter of 1/16 inch.
- The M4 screw size has a diameter of 7/64 inches.
- The M5 screw size has a diameter of 1/8 inch.
- The M6 screw size has a diameter of 9/64 inches.
- The M8 screw size has a diameter of 5/32 inches.
- The M10 screw size has a diameter of 3/16 inches.
Table of Contents
- How do you determine screw size?
- How do I identify screw size?
- Buying Guide
- Types
Standard & metric screw size chart
Here’s the standard & metric screw size chart you need to help you find the right products at the shop! It doesn’t matter if you’re working outside or on furniture. ASME is the organization that is in charge of a lot of the standardization work. These standards dictate things like thickness and screw thread.
| STANDARD SCREW SIZES & THREADDIAMETER CHART | ||||||
| Size | Millimeter | Inch | Nearest Fraction | Major diameter | Pitch diameter | Minor diameter |
| #0 | 1.5 | 0.06 | 1/16 | |||
| #1 | 1.8 | 0.07 | 5/64 | |||
| #2 | 2 | 0.08 | 3/32 | |||
| #3 | 2.3 | 0.09 | 7/64 | |||
| #4 | 2.8 | 0.11 | 7/64 | |||
| #5 | 3.1 | 0.12 | 1/8 | |||
| #6 | 3.3 | 0.13 | 9/64 | |||
| #8 | 4.2 | 0.16 | 5/32 | |||
| #9 | 4.5 | 0.177 | 11/64 | |||
| #10 | 4.8 | 0.19 | 3/16 | |||
| #12 | 5.5 | 0.21 | 7/32 | |||
| #14 | 6.3 | 0.24 | ¼ | |||
| 8-32 | 0.164 | 0.1437 | 0.1257 | |||
| 6-32 | 0.138 | 0.1177 | 0.0997 | |||
| 4-40 | 0.1112 | 0.0958 | 0.0813 | |||
| 10-24 | 0.19 | 0.1629 | 0.1389 | |||
| 10-32 | 0.19 | 0.1697 | 0.1517 | |||
| 2-56 | 0.086 | 0.0744 | 0.0662 |
M2 screw size
We use the M2 screw in small items, such as electrical equipment, cameras, and mobile phones. They’re also common in laptops and the like. The “M” corresponds to the outer diameter in the metric system, so an M2 has a diameter of 2mm. Do keep in mind that in reality, the actual diameter would vary between 1.9mm to 2mm because of manufacturing tolerances.
n. Some manufacturers offer non-standard pitches, so it is best to reach out to them for any concerns in customization. If the measurement reads M2 x 8, the diameter is 2mm and has a length of 8mm.
Brass, nylon, stainless steel, steel, aluminum, and titanium are a few of the materials used in fabricating this type.
M4 screw size
An M4 screw is slightly larger than an M2. The M4 comes in several lengths but shares the same diameter of 4mm. The M4 screw size in inches is the equivalent of 0.15748.
M5 screw size
The M5 screw size has a diameter of 5mm. The M5’s dimensions are significantly thicker than an M4 but can be used in several applications. Some have an anti-corrosive finish to prevent rust from building up.
The M5 screw size in inches is the equivalent of 0.19685 inches.
M6 screw size
The diameter of an M6 screw is 6mm. It comes in several thread pitches, such as 12-24 and 10-32. A sample application of an M6 is attaching the equipment to the vertical uprights of a rack. We typically use the threads mentioned above in rack applications.
M8 screw size
An M8 screw has a diameter of 8mm. It has a pitch thread of 1.00mm for fine and 1.25mm for standard.
M10
The M10 screw has the widest diameter among these six kinds. It has a diameter of 10mm and comes in several lengths.The M12 is even wider and can shoulder heavier loads.
How do you determine screw size?
When looking into and determining screw size dimensions, 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. To measure screw size, we take its diameter. If the measurement says 1/4-20, it means it has a diameter of 1/4 inch and 20 threads per inch. A ruler is all you need to determine thread count and size.
The first step in measuring the length is finding a surface to lay it down on an even surface. Start measuring wherever the head would rest when fully embedded into something. In some cases, you may need to hang it off the edge of a surface to lay it flat. Ones with a pan, round, or truss head should be measured from the bottom of the head to the tip. Ones with a flat or oval head should be measured from the top to the tip. Hex head ones are an exception to this rule, which means you need to measure from the bottom of the head.
Now that you know how to take the measurement, the next step is to place the ruler down the axis to get the thread count. For accuracy, count the first thread as zero. Within one inch of the length, count the number of thread gaps. Once you have these values, you can now divide the length by the number of thread gaps. If there are four thread gaps in a one-inch length, the thread pitch would be 0.250 inches (one inch / 4 thread gaps = 0.250 inches). In other words, the gap in between each thread is 0.250 inches, and it has a Thread Per Inch (TPI) of four.
Lay it down on a flat surface again. Using a ruler or measuring tape, get the measurement from one side of a thread to the other to get the diameter. The diameter in the imperial system is represented in either fraction of an inch or a gauge number. If you are using the metric system, use the cm or mm side of the ruler to measure the diameter. Keep in mind that when purchasing ones with measurements that are listed in the metric system, the initial number is the diameter.
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 is the significance of knowing these things if you can walk into the hardware store and ask the sales clerk for assistance? Well, there is not always someone available to assist you. Sometimes, they do not know much about it. You may get false or inaccurate information. When it comes to things as intricate as sizes, knowing the bare minimum helps. It can save you from buying the wrong type, leading to unnecessary expenses and wasted time and effort. It can even cause a failed project.
- Step 1: Identifying the first number of the size
The first number is the largest diameter measurement of the thread. For example, a 4-30 x 0.10 has a diameter of 0.112 inches. It is because 0.060 + (4 x 0.013) = 0.112 inches.If it is larger than ten, it is expressed as a fraction of an inch. For example, a 1/8-10 x 4/6 has a diameter of 1/8 of an inch.
Should you see the letter M, it means the measurement is in millimeters. For example, M5-0.4 x 10 has a major diameter of 5 mm.
- Step 2: Reading the second number
The second number expresses the number of threads per unit of distance in between these threads. You can also refer to it as the thread pitch. If you have a 4-30 x 0.10, the threads per inch (TPI) is 30.In the metric system, the threads are expressed in millimeters per thread. An M5-0.4 x 15 has a thread for every 0.4 mm.
- Step 3: Reading the third number
The third number is typically the one after the x, and it prescribes the length of the screw. You measure them all from the bottom of the head down to the tip. The only exception from the rule is flathead screws, which sit flush on the surface. You should measure this type from the top of the head down to the tip. An M5-0.4 x 15 has a length of 15 mm.
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.
Several companies indicate the metric and imperial size on the packaging, which is helpful to most consumers. The challenge often comes when purchasing online. Most retailers do not indicate both system sizes on the product page. Why? It makes the product page too long.
Imperial Sizes
The gauge indicates the diameter. A larger number means a bigger diameter, whereas a smaller number means a smaller diameter. For example, a number 3 is smaller than a number 11.
The gauge sizes do not have a direct connection with the actual head size. When measuring the length of a flathead screw, start on top of the head down to the stem. On the other hand, start from the bottom of the head down to the stem for other types. The gauge and length determine the size.
To calculate the gauge and head sizes, you can use the formula below.
Gauge = (Head diameter in sixteenths of an inch X 2) – 2
Metric Sizes
Generally, the metric system is easier to understand. It may take additional time to adjust if you are already comfortable with the imperial system. Instead of using gauges in expressing diameter, the metric system uses millimeters. On the other hand, it still uses millimeters to measure length.
The gauge (imperial) is approximately the head’s size in millimeters (metric). However, there is no correlation or scientific explanation here.
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.
For the most accurate length, measure using millimeters from where the screw head sits to the tip. You don’t always measure from the top of the head. It depends on where the head would sit on the surface. Use a ruler or a measuring tape to get the most accurate measurement.
Here are some points to keep in mind when getting the length:
- Screw heads rest differently on surfaces. If the head is flat, it will most likely sit flush. Otherwise, there will be a bump.
- For flat-headed ones, measure from the tip to the top to get the length.
- For round-headed ones, measure from the tip to the bottom of the head. The rounded head will stick out from the surface, which should not be included when measuring.
- For any other types that are not countersunk, measure from the flat underside to the tip.
Once you have the length, it is time to get the diameter. Use millimeters to measure from one side of a thread to the other. If the packaging has measurements indicated in the metric system, the first digit represent the diameter. For example, 4.0 means the screw has a diameter of 4 millimeters (mm).
Lastly, you need to measure the distance from one thread to another. It’s also referred to as the pitch. In the metric system, we use pitch instead of thread spacing. To get this final measurement, use a ruler or measuring tape. In most cases, the pitch would only measure less than 1 mm. It is recorded in a decimal point of an mm.
In summary, diameter is listed first before the length. For example, 4.0 x 50 means the screw has a diameter of 4 mm and a length of 50 mm.
Standard System
The standard system is otherwise known as the imperial system. It was introduced in the British Weights and Measures Act of 1824. It evolved through a series of amendments in the said act. For some time, the imperial system had been the standard measurement system. By the late 20th century, several countries have adopted the metric system. Presently, Canada and the United Kingdom are countries still using the imperial unit system.
The imperial system uses inches when getting the length from the tip to where the head rests and the diameter. The measurement should start wherever the head rests.
When getting the length using inches, here are some points to keep in mind:
- Take the length of a flat head from the tip to the top of the head.
- For round-headed ones that are not countersunk, measure from the flat underside to the tip.
- For round-headed ones that are countersunk, start measuring where the countersunk and the oval top meet in the middle. To put it simply, this is where the oval top would rest on the surface.
- For flat-headed ones that are countersunk, measure from the tip to the top of the head.
Take the diameter by measuring the thread’s width in fractions of an inch using a measuring tape or ruler. A gauge number or fraction of an inch represents the diameter in the imperial system.
- A gauge number represents the fraction of an inch in diameter. To know the diameter, you need to refer to a gauge guide to match the gauge with a fraction of an inch.
- For example, a #0 gauge is 1/16 inch in diameter. A #1 gauge is 5/64 inch, and a #2 gauge is 3/32 inch.
Lastly, count the threads in one inch to get the thread spacing value. To get an accurate measurement, lay the screw next to a measuring tape or ruler and count the number of threads. The thread count in the imperial system ranges from 35 to 40 threads per inch. Thread pitch and thread spacing mean the same thing, so don’t get those two confused.
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.
Cement Board
The cement board type is fully threaded, securing the backer board to subfloors or wall studs. The coating prevents corrosion from happening as a result of mortar and moisture. You can use it in metal and wood.
Wood
A wood screw has a pointed tip that aids in wood-to-wood fastening. One part has coarse threads, while the other is an unthreaded shank. It helps in fastening wood pieces together.A common type is the pan head with a round head.
Deck
Deck screws are for fencing and decks, but they can also be used for similar outdoor projects. Composite deck ones have fine threads and a small head. On the other hand, wood deck ones have an unthreaded shank and a coarse-threaded portion.
Drywall
Drywall screws are for interior projects, specifically for securing drywall. Fine-threaded drywall ones work best with metal studs, while coarse-threaded ones work with wood studs. Do keep note drywall ones cannot support tile and cement board.
Lag
We use a lag screw to fasten components that handle a heavy load. It has a hex head, so you need a socket and ratchet or a wrench to secure it in place.
Structural Wood
Structural wood screws have an unthreaded shaft and coarse threads. Structural wood ones may appear similar to wooden ones, but they are more durable.
Sheet Metal
Sheet metal screws secure sheet metal. They are fully threaded and are available for use with self-drilling points and pre-drilled holes.
Machine
Machine screws are fully threaded, which you can use in fastening metal pieces together. The two main types are socket cap screws and socket sets. The has a cylindrical, raised, hex-socket head, while the latter is headless.
Multi-Material
You can use a multi-material one in several materials, such as drywall or sheet metal. Wood and plastic ones are also good options.
Concrete
A concrete screw is what you need for fastening concrete. Some require you to pre-drill, while others are self-tapping. It allows you to drill directly into the surface without pre-drilling.
Drive Types
Phillips and slotted drives are the two main types. Some are a combination that works for either type.
There is also the Allen drive, which has a six-sided socket. The square drive (Robertson drive) and star drive (Torx) have a head that minimizes camming out.
Thread Types
Fine-threaded screws are best used with pre-tapped holes. The closer distance between these threads allows a tight hold. However, it would take a longer time to remove or install.
Coarse-threaded ones have a wider space between threads. We often use it with softer materials, such as drywall or wood. It is easy to install and remove.
Here’s a good resource on . Make sure you get the right screw length, thread diameter, and screw threads for your project. We also have a resource on Phillips head options.
FAQ
What is the screw size number?
This is an indication of how big it is, as well as the threads per inch. From this number, you can gather a lot of information.
How big is a #8 screw?
4.2mm in diameter.
What size is an M3 screw?
3.0mm in diameter.
What size is an M2 screw?
2.0mm in diameter.
Time needed:5 minutes.
How do I identify a screw size?
- Put the screw on a flat surface.
You will want the entire thing to lay flat, which means the head will need to lie off of the edge of a table or other surface.
(Video) Review of RUIQING 600pcs M6 M5 M4 M3 Nuts and Bolts, Screw & Bolt Assortment Sets - On the axis, you will want to place the ruler.
Start at the first thread, which gets the number zero.
- Within 1 inch of the screw, you’ll start counting the thread gaps.
- Find the TPI by dividing the thread gaps by the 1-inch length.
If there are 6 thread gaps, divide 1 inch by 6, resulting in thread gaps of .1667 inches.
- As it is lying flat, measure across the diameter.
The outermost part is where you will want to measure from. If you are doing measurements on a worn one, you’ll get inaccurate results.
FAQs
Which screw is bigger M5 or M6? ›
...
Table 3.
| Metric | Closest Inch |
|---|---|
| M4-0.7 | 8-36 (Larger) |
| M5-0.8 | 10-32 (Smaller) |
| M6-1.0 | 1/4-28 (Larger) |
| M7-1.0 | 1/4-28 (Smaller) |
The “M” designation for metric screws indicates the outer diameter of the screw in millimetres, so for an M2 screw, the outer diameter is 2mm. However, in practice the actual diameter might be between 1.9mm-2mm due to manufacturing tolerances.
What does M4 M6 mean for screws? ›m4 .7 pitch =3.3 hole. m5 .8 pitch =4.2 hole. m6 1.0 pitch=5.0 hole. all taps have size and pitch on them hope this has helped.
What size bolt is M4? ›The M4 machine screw has a thread diameter of 4 millimetres, in simple terms the M stands for millimetres followed by the size – in this case 4 mm.
What size is a M10 bolt? ›| NOMINAL SIZE (D) | BODY DIAMETER | ACROSS THE FLATS |
|---|---|---|
| m10 | 10.00 | 15.73 |
| m12 | 12.00 | 17.73 |
| m14 | 14.00 | 20.67 |
| m16 | 16.00 | 23.67 |
M10-1.0 x 20
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.
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.
What size screw is M2 6mm? ›The M2 x 6mm Slotted Pan Head Screws (DIN 85) - Stainless Steel (A2) has the following features: 1.3mm Head Length (H) DIN 85 Manufacturing Standard. 6mm Length (L)
What does M stand for in screw sizes? ›The standard metric rack screw is called M6 x 1. The 'M' means it's metric. The '6' is the outside diameter measured in millimeters, and the '1' is the distance between adjacent threads, also in millimeters. Metric threads are used outside of the USA, and commonly in products by HP and other global entities.
How do you tell if a screw is M2 or M3? ›The actual diameter of an M3 screw is usually about 2.9mm, an M2. 5 screw is 2.4mm and an M2 is 1.9mm. So if you are measuring the screw yourself and your caliper says the screw diameter is 2.4mm you have to order an M2.
What does M8 mean? ›
Noun. m8 (plural m8s or m8's) (Internet slang, text messaging) Abbreviation of mate.
What size is M5 screw? ›The M5 screw size has a diameter of 5mm. The M5's dimensions are significantly thicker than an M4 but can be used in several applications. Some have an anti-corrosive finish to prevent rust from building up.
What is the difference between screw M4 and M8? ›The ISO metric bolt has its diameter as the numeral part of the name. So M8 has a diameter of 8mm compared to that of the M4 bolt.
What bolt size is M6? ›M6 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 1 mm. The number 1 mm refers to 1 threads per millimeter.
What size is M5? ›All M5 bolts have a head diameter of 8.5mm. Head Height of 5mm. Use a 4mm allan key.
Is M4 metric or standard? ›...
| Inches | Metric Size- Pitch, ISO and IFI Rec. | |
|---|---|---|
| 4- 40 | 4- 48 | M3 x 0.5 |
| 6- 32 | 6- 40 | M3.5 x 0.6 |
| 8- 32 | 8- 36 | M4 x 0.7 |
| 10- 24 | 10- 32 | M5 x 0.8 |
M- Indicates this bolt uses metric threads. 5- Refers to the nominal diameter of the bolt shaft in millimeters. X- Separates the Metric size of the threads and how long the bolt is. 18- This means the threaded part of the bolt is 18mm long.
Which is bigger M8 or M10? ›10mm is larger than 8mm. The second number is the thread pitch. The nut and the bolt need the same pitch.
What size nut is M5? ›M5 nuts have a diameter of 5 mm and should be used in conjunction with the relevant sized bolt, for a perfect fit. We stock different types of 5mm nut such as tee nuts, wing nuts and standard 5mm locking nuts.
Are M10 screws 10mm? ›M10 (10mm x 50mm) Hex Socket Button Machine Screw (Bolt) - Steel (Pack of 10)
What is M10 equivalent to? ›
| Metric coarse | Metric fine | BSF/BSW |
|---|---|---|
| M6 x 1 | M6 x 0.75 | 1/4" |
| M8 x 1.25 | M8 x 1 | 5/16" |
| M10 x 1.5 | M10 x 1.25 | 3/8" |
| M12 x 1.75 | M12 x 1.25 | 1/2" |
Most bolts come in pretty uniform lengths; and this is a good way to determine if the bolt is metric or standard. Measure the bolt length (not including the cap), and see if it's closer to a fraction of an inch, or a nice and round millimeter length that ends in 5 or 0.
What is the diameter of a M5 bolt? ›All M5 bolts have a head diameter of 8.5mm.
What is the difference between m8 and m10? ›The first number is the nominal diameter. 10mm is larger than 8mm. The second number is the thread pitch. The nut and the bolt need the same pitch.
What size is M5 bolt in inches? ›| Fastener Sizes in Inches | ||
|---|---|---|
| Metric & Inch Size | Diameter (inches) | Rounded to Nearest 64th (inches) |
| M5 | 0.1969 | 13/64 |
| #12 | 0.2160 | 7/32 |
| M6 | 0.2362 | 15/64 |
| Metric Pan Head Screw Size Options | ||
|---|---|---|
| Screw Size | Diameter | Material |
| M1 | M1 (1mm) | 304 Stainless |
| M1.2 | M1.2 (1.2mm) | 304 Stainless |
| M2 | M2 (2mm) | 304 Stainless |
As a rule of thumb, the diameter of the clearance hole is more than the diameter of the screw. The M3 screw's clearance hole is either 3.5 or 3.2mm. The M4 screw has a clearance hole of at least 4.2mm.
What screwdriver to use for m2 screw? ›*Please use a standard Phillips screwdriver (3.5mm) for disassembling the case; and a smaller Phillips screwdriver for installing the M. 2 solid state drive as it uses screws with a diameter of 1.85-1.98mm.
Is M8 a bolt or screw? ›M8 bolts are highly adaptable strong fixings which can be used in many applications, such as securing heavy timbers, metals or concrete. With a full or half threaded stem they can be used with either a nut or into a tapered hole. Available in a range of heads, lengths and pack sizes.
Is an M8 bolt 8mm wide? ›Each size is denoted by the letter 'M' followed by a number. This number indicates the outer diameter of the thread, measured in millimetres. As an example, a hex bolt with a thread size of M8 would have an outer diameter of 8mm.
What is screw size M8? ›
The M8 machine screw has a thread diameter of 8 millimetres, in simple terms the M stands for millimetres followed by the size – in this case 8mm.
Is M5 the same as 5 mm? ›Bolts and nuts described as M5 means they are bolts or nuts with threaded 5 mm bodies. Additional numbers in the description indicate thread pitch and length.
Is #10 screw same as M5? ›A 10-32 and and M5 coarse screw are almost identical!
How do I know if my screw is M4? ›If your bolt is metric, then the diameter is stated using the letter "M". For example, if your bolt has a diameter of 4mm then it is called an 'M4 bolt' if your bolt is imperial then it will be measured in inches. for example if it measures 1/4", then the bolt diameter is simply 1/4". Which Thread do you Need?
What thread is a M8 screw? ›...
Metric Thread Pitch Table - Monster Bolts.
| Screw Size | Metric Thread Pitch (mm.) | |
|---|---|---|
| M4 | 0.70 | - |
| M5 | 0.80 | - |
| M6 | 1.00 | - |
| M8 | 1.25 | 1.0 |
As for width, the new M8 is wider than the M6 by a scant 0.27 inch. The folks at BMW did make the new M8 lower than the M6, with the M8 rising to 53.62 inches and the M6 reporting 54.10 inches.
What size is an M6 bolt? ›M6 Threads
The outside diameter of the threads is 6 mm. The standard metric rack screw is actually an M6 x 1 mm. The number 1 mm refers to 1 threads per millimeter. You can identify an M6 screw by measuring the diameter at slightly more than 7/32″ (0.2362″).
M M6 to M8 Adapter allows you to extend the functionality of your M6 screws that sometimes might not fit you screen. This allows your M6 screw to fit the M8 hole on the backside of your screen.
Is M8 6mm? ›...
Spanner and Allen Key Sizes.
| Size | Spanner | Allen Key |
|---|---|---|
| M5 | 8 mm | 4 mm |
| M6 | 10 mm | 5 mm |
| M8 | 13 mm | 6 mm |
| M10 | 17 mm | 8 mm |
M- Indicates this bolt uses metric threads. 5- Refers to the nominal diameter of the bolt shaft in millimeters. X- Separates the Metric size of the threads and how long the bolt is.
What size is M4 in mm? ›
| Thread Size | Nominal Diameter (mm) | Effective Diameter (mm) |
|---|---|---|
| M3 | 3.0 | 2.675 |
| M3.5 | 3.5 | 3.110 |
| M4 | 4.0 | 3.545 |
| M4.5 | 4.5 | 4.013 |
The M5 machine screw has a thread diameter of 5 millimetres. The M stands for millimetres followed by the size – in this case 5 mm.
What size bolt is M8? ›M8 screw size
An M8 screw has a diameter of 8mm. It has a pitch thread of 1.00mm for fine and 1.25mm for standard.
| Tap size | Basic major dia (mm) | Basic major dia (inch) |
|---|---|---|
| M4 x 0.7 | 4mm | .1575 |
| M5 x 0.8 | 5mm | .1969 |
| M6 x 1 | 6mm | .2362 |
| M8 x 1.25 | 8mm | .3150 |
| WRENCH OR SOCKET SIZE ACROSS FLATS | HEX NUTS STYLE 1 | HEAVY HEX NUTS |
|---|---|---|
| 15.00 | M10 x 1.5 | |
| 16.00 | M10 x 1.5 | |
| 18.00 | M12 x 1.75 | |
| 21.00 | M14 x 2 | M12 x 1.75 |
M10 nuts have a diameter of 10 mm and are one of the most common sizes of nut available. We stock different types of 10mm nut such as tee nuts, wing nuts and standard 10mm locking nuts.
What is the difference between M8 and M10 bolts? ›The M8 will measure about 8 mm in diameter, more likely, just a touch undersize, (. 31496") The M10, about 10 mm in diameter, (. 3937") and the M12 about 12 mm in diameter, (. 4724").
Is M8 coarse or fine? ›For thread pitch, the distance between two points is the second number meaning the higher the number the fewer threads there are. This means the M8 x 1.25 is the coarse threading and the M8 x 1 is the fine thread.