Well, quick answer is no. They are not the same and they are not interchangeable, although they can work under certain circumstances. The most important part is understanding the meaning of M8 and 5/16 to refer to the size of a metric screw or bolt, so then we can see why they aren’t the same thing!
What size thread is a 8mm bolt? Metric Shoulder Bolt Dimensions
| Shoulder Diameter (A) | Thread (C) | Thread Length (D) |
|---|---|---|
| 8mm | 6mm x 1.0 | 11.25mm |
| 10mm | 8mm x 1.25 | 13.25mm |
| 12mm | 10mm x 1.5 | 16.4mm |
| 16mm | 12mm x 1.75 | 18.4mm |
Similarly, Is M8 and 8mm the same thing? M8 is not exactly 8mm but it is sufficient from a non-engineering point of view as long as the thread pitch is correct. Luckily, most commonly available metric bolts have the same pitch. Regarding tolerance for common uses it can also often be ignored.
How do I know if I have a 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.
What size hole do you drill for a M8 bolt?
Metric Threads
| Thread | Drill size for tapping standard metric threads | Clearance hole |
|---|---|---|
| M5 | 4.2 | 5.5 |
| M6 | 5 | 6.6 |
| M8 | 6.8 | 9 |
| M10 | 8.5 | 11 |
What size is M8 screw in inches?
Table 3.
| Metric | Closest Inch |
|---|---|
| M8- 1.25 | 5/16-18 (Smaller) |
| M10-1.5 | 3/8-16 (Smaller) |
| M12-1.75 | 1/2-13 (Larger) |
| M14-2.0 | 9/16-12 (Larger) |
What size head is a M8 bolt? FLAT HEAD SOCKET CAP SCREW – METRIC
| Size | Head Diameter | Hexagon Socket Size |
|---|---|---|
| M4-0.7 | 8.96 | 2.50 |
| M5-0.8 | 11.20 | 3.00 |
| M6-1.0 | 13.44 | 4.00 |
| M8-1.25 | 17.92 | 5.00 |
What is M8 in standard? Thread Conversion Table
| 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″ |
What does M8 1.25 mean?
For metric fasteners, you will see a M8 x 1.25 or an M8 x 1. 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.
What size drill bit is AQ drill bit? Drill Bit Size Chart
| Size | Decimal Equivalent | Size |
|---|---|---|
| 83 | 0.012 | 8.30 mm |
| 82 | 0.0125 | 21/64″ |
| .32 mm | 0.0126 | 8.40 mm |
| 81 | 0.013 | Q |
What size is an M8 bolt in inches?
Table 3.
| Metric | Closest Inch |
|---|---|
| M8- 1.25 | 5/16-18 (Smaller) |
| M10-1.5 | 3/8-16 (Smaller) |
| M12-1.75 | 1/2-13 (Larger) |
| M14-2.0 | 9/16-12 (Larger) |
What does M8 mean? M8 means « Mate. » The abbreviation M8 is an informal term of endearment for a friend. Most often used between men, M8 can also be a term of general acknowledgement. M8 uses the number 8 to replace the letters « ate. » Here are some other terms that make use of this efficiency: D8 (Date)
Is an M8 bolt 8mm wide?
But, to answer your Q – an M8 bolt will fit in an 8mm hole.
What size bolt has a 36mm head?
Metric Hex Bolt Dimensions
| NOMINAL SIZE (D) | BODY DIAMETER | HEAD THICKNESS |
|---|---|---|
| m36 | 36.00 | 23.38 |
| m42 | 42.00 | 26.97 |
| m48 | 48.00 | 31.07 |
| m56 | 56.00 | 36.2 |
• Jul 2, 2015
How do you read thread size? Thread sizes are given in nominal sizes, not in the actual measurement. The exact measurement is slightly below the named or nominal size. For example, a 6mm bolt may measure 5.8mm or 5.9mm, but it is called 6mm bolt. It is also common to use “M” before the bolt size, such as M6 for a 6mm bolt.
How do I determine thread size?
What does it mean m8x1 25?
M means metric. 8 means 8mm nominal diameter (the thread will be less than 8 mm at the widest point) X 1.25 means 1.25 mm per thread (thanks the standard coarse pitch for this thread)
What size is 8mm drill bit? Metric Tap and Drill Bit Size Table
| Tap | Metric Drill | US Drill |
|---|---|---|
| 7mm x 1.0 | 6.1mm | 15/64″ |
| 8mm x 1.25 | 6.9mm | 17/64″ |
| 8mm x 1.0 | 7.1mm | – |
| 10mm x 1.5 | 8.7mm | – |
What size is a #60 drill bit?
Downloadable versions:
| Drill size | Diameter (in) | Diameter (mm) |
|---|---|---|
| #62 | 0.0380 | 0.9652 |
| #61 | 0.0390 | 0.9906 |
| 1 mm | 0.0394 | 1.0000 |
| #60 | 0.0400 | 1.0160 |
What size drill bit do I need for a 1/2 bolt? Use the same size drill bit as the diameter of the bolt. If you are using a 1/2″ diameter bolt use a 1/2″ drill bit.
What size is M8 bolt head?
Dimensions for DIN931 Hex Head Bolt
| Diameter (d) | Pitch | Across Flats (s) |
|---|---|---|
| M7 | 1.0mm | 11mm |
| M8 | 1.25mm | 13mm |
| M10 | 1.5mm | 17mm |
| M12 | 1.75mm | 19mm |
How big is a M8 bolt diameter?
| Size | Clearance Hole | Tapping Drill (fine pitch) |
|---|---|---|
| M6 | 6.5 | 5.25 mm |
| M8 | 9 | 7 mm |
| M10 | 11 | 9.0 or 8.75 mm |
| M12 | 14 | 10.5 mm |
What is equivalent to M8 bolt?
Fastener Conversion Chart
| Inch Equivalent | Metric Size-PitchISO and IFI Rec. | |
|---|---|---|
| 1/4- 20 | 1/4- 28 | M6x 1 |
| 5/16-18 | 5/16- 24 | M8x 1.25 |
| 3/8-16 | 3/8- 24 | M10x 1.5 |
| 7/16-14 | 7/16- 20 | M12x 1.75 |
How strong is M8 bolt? The first number gives the breaking strength of the steel in the bolt. In round terms it is in 10’s of kg per square millimeter of the bolt.
…
| Size | Pitch (std) | Pitch (fine) |
|---|---|---|
| M6 | 1.0 | 0.75 |
| M8 | 1.25 | 1.0 |
| M10 | 1.5 | 1.0 or 1.25 |
| M12 | 1.75 | 1.5 |
How strong are M8 screws?
From the table at right, for a strength class of 10.9 and a maximum allowable load of 200 kgf, the suitable bolt is a 318［kgf］M8. Therefore we select a 10 mm MSB10 with a M8 thread section. When the bolt is subjected to shear load, also use a dowel pin.