M12 Bolt Size and Thread Specifications
M12 is a large metric bolt size used in structural, automotive, and heavy machinery applications. A 12 mm nominal diameter with 1.75 mm pitch provides high strength and is common in flanges and critical joints.
Specifications
| Specification | Value |
|---|---|
| Nominal diameter | 12 mm |
| Standard pitch | 1.75 mm |
| Fine pitch | 1.5 mm |
| Tap drill size | 10.2 mm |
| Closest imperial equivalent | 1/2-13 |
Hex head size
| Bolt size | Hex head size |
|---|---|
| M12 | 19 mm |
Common uses
M12 bolts are used in structural connections, automotive suspension and drivetrain, machinery flanges, and anywhere high clamp force is required. They are standard in many industrial and automotive specifications.
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FAQ
What is the standard pitch for an M12 bolt?
The standard pitch for M12 is 1.75 mm. Fine pitch is 1.5 mm.
What drill size should be used for tapping M12 threads?
For M12 x 1.75 coarse thread, use a 10.2 mm tap drill.
What imperial bolt is closest to M12?
1/2-13 UNC is the closest imperial equivalent to M12.