M3 Bolt Size and Thread Specifications
M3 is a small metric fastener used in electronics, small machinery, and precision assemblies. It provides a 3 mm nominal diameter with 0.5 mm pitch and is commonly used where space is limited.
Specifications
| Specification | Value |
|---|---|
| Nominal diameter | 3 mm |
| Standard pitch | 0.5 mm |
| Tap drill size | 2.5 mm |
| Closest imperial equivalent | #4-40 |
Hex head size
| Bolt size | Hex head size |
|---|---|
| M3 | 5.5 mm |
Common uses
M3 bolts are common in electronics enclosures, small machinery, cameras, and precision equipment. They are also used in furniture hardware and light structural applications.
Related tools
Related charts
FAQ
What is the standard pitch for an M3 bolt?
The standard pitch for M3 is 0.5 mm.
What drill size should be used for tapping M3 threads?
For M3 x 0.5 thread, use a 2.5 mm tap drill.
What imperial screw is closest to M3?
#4-40 is the closest imperial equivalent to M3.