M3 is our thinnest size of machine screw. Our M3 machine screws are made from a durable carbon steel and include a nut for tightening metal surfaces together. The M3 machine screw has a thread diameter of 3 millimetres, the M stands for millimetres followed by the size – in this case 3 mm. We stock different lengths and head types such as countersunk or pan head depending on the fitting you need.
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| Thread Size | Major Diameter (mm) | Minor Diameter (mm) |
|---|---|---|
| M3 | 3.0 | 2.459 |
| M3.5 | 3.5 | 2.850 |
| M4 | 4.0 | 3.242 |
| M4.5 | 4.5 | 3.688 |
The M3 is a thinner screw with a finer thread than the #6-32 UNC. This makes it more suitable for fastening into smaller parts and thinner materials requiring good strength in a limited space.
What does M3 mean in bolts? ›The M3 machine screw has a thread diameter of 3 millimetres, the M stands for millimetres followed by the size – in this case 3 mm.
Which is bigger M3 or M4 screws? ›Note - Metric screw diameters usually start with "M" (M3, M4, M5...), for this chart you can just drop the 'M' from the front and add an extra at the back (M3 = 3mm, M4 = 4mm...).
What does the M in M3 screw stand for? ›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.
What size is the head of a M3 screw? ›M3 (3mm) Thread Size. 5.5mm Head Diameter (D)
What size drill bit for a M3 screw? ›| Thread | Drill size for tapping standard metric threads | Clearance hole |
|---|---|---|
| M3 | 2.5 | 3.4 |
| M3.5 | 2.9 | 3.9 |
| M4 | 3.3 | 4.5 |
| M5 | 4.2 | 5.5 |
A 6x32 is a machine screw (not for wood) with 32 threads per inch of it's length, diameter of just under 1/8″ and is meant to thread into a metal nut or a tapped hole in metal. There are also 6 x 40, a finer 40 per inch twist.
What are M3 5 screws used for? ›Most commonly used within the electrical trade, M3. 5 thread screws provide a tamper-proof fixing for access control panels and electrical sockets, for example in hospitals, schools, mental health facilities and prisons.
How to identify machine screws? ›In general machine screws are identified by a description which includes the diameter of the screw body, the threads pitch, the length of the screw below the head (except for flat head which are from the top of the head), the head style and the material.
Metal screws were called machine, or machinery, screws since they were made of metal and mated with threaded holes.
What is the difference between a machine screw and a bolt? ›Machine screws may look like bolts, but they aren't necessarily the same. Machine screws have a slotted head, whereas bolts have a hex head. With a slotted head, machine screws can be installed using a screwdriver, such as a Philips head or flat-heat screwdriver.
How to read machine screw sizes? ›Screws have three basic measurements: gauge, threads per inch, and shaft length in inches. So, you may also see a measurement like 6-32 x 1 1/2". This means it's a #6 diameter, with 32 threads per inch (almost double the normal thread count as a standard wood screw) and an inch and a half long.
Are there M3 screws? ›M3 screw and bolt sizes for the more common ones we deal with. This will give information about the maximum screw head heights and head diameters as well as the driver size needed to install or remove them.
How do I tell what size screw I have? ›To measure the diameter of screws and bolts, you measure the distance from the outer thread on one side to the outer thread on the other side. This is called the major diameter and will usually be the proper size of the bolt.
What size are M3 thumb screws? ›| Technical Summary | ||
|---|---|---|
| d | nominal diameter | M3 |
| ds | shoulder width | 6 |
| h | height | 7.5 |
| k | head height | 2.5 |
M3 (3mm) Thread Size. 2.4mm Nut Thickness (H) 5.5mm Socket Size (J)
What size are M3 low head cap screws? ›| Thread d | M3 | |
|---|---|---|
| da | max. | 3,6 |
| ds | nominal=max. | 3 |
| min. | 2,86 | |
| dw | min. | 4,84 |
M3 (3mm) Thread Size. 6mm Head Diameter (D)
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