How to Calculate a Bolt Thread Length
At Arun Fasteners we are often asked about the thread length on differing size Hex Head Bolts. Below is a helpful guide.
NOTE: It is measured from UNDER the head
Bolt Thread Length
|
0 to 125mm |
2 x Diameter + 6mm |
|
125 to 200mm |
2 x Diameter + 12mm |
|
200+mm |
2 x Diameter + 25mm |
We’ve listed below a range of bolt sizes as an example:
| Bolt Size | Thread Length |
|---|---|
|
M8 x 70 |
22mm |
|
M10 x 180 |
24mm |
|
M12 x 200 |
49mm |
|
M14 x 280 |
53mm |
|
M16 x 190 |
44mm |
|
M18 x 300 |
61mm |
|
M20 x 140 |
65mm |
|
M22 x 360 |
69mm |
|
M24 x 100 |
54mm |
Here are some examples of some Bolts we stock-
NOTE: It is measured from UNDER the head
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