M4 Bolt Size and Thread Specifications
M4 is a common small metric fastener used in machinery, automotive trim, electronics, and general hardware. A 4 mm nominal diameter with 0.7 mm pitch offers a good balance of strength and compact size.
Specifications
| Specification | Value |
|---|---|
| Nominal diameter | 4 mm |
| Standard pitch | 0.7 mm |
| Tap drill size | 3.3 mm |
| Closest imperial equivalent | #8-32 |
Hex head size
| Bolt size | Hex head size |
|---|---|
| M4 | 7 mm |
Common uses
M4 bolts are used in machinery, automotive assemblies, electronics, furniture hardware, and light structural components. They are widely available and easy to source.
Related tools
Related charts
FAQ
What is the standard pitch for an M4 bolt?
The standard pitch for M4 is 0.7 mm.
What drill size should be used for tapping M4 threads?
For M4 x 0.7 thread, use a 3.3 mm tap drill.
What imperial screw is closest to M4?
#8-32 is the closest imperial equivalent to M4.