M5 Bolt Size and Thread Specifications
Quick answer
M5 bolts measure 5mm major diameter with 0.8mm coarse pitch in standard tables.
They are common in appliances, light structures, and shop jigs.
Use the specifications below and the tap drill calculator whenever pitch differs from coarse.
M5 is a popular metric size for machinery, automotive, and general hardware. With a 5 mm nominal diameter and 0.8 mm pitch, it fits between M4 and M6 in strength and availability. Spanish reference: perno M5. For tap drill size, thread types, and thread identifier workflows, pair this page with tools as you verify threads.
Specifications
| Specification | Value |
|---|---|
| Nominal diameter | 5 mm |
| Standard pitch | 0.8 mm |
| Tap drill size | 4.2 mm |
| Closest imperial equivalent | #10-24 |
Hex head size
| Bolt size | Hex head size |
|---|---|
| M5 | 8 mm |
Common uses
M5 bolts are used in machinery, automotive components, electronics, furniture, and structural applications where a medium-small fastener is required. Cross-check loads with the bolt size chart and screw size conversion when you mix metric and inch bins.
Related tools
Related charts
M5 vs M6 bolt size
Shank diameter and pitch set tap drill, hex key, and strength for each ISO size. Compare values in the tables above with the M6 bolt size page when you resize hardware.
Use the bolt size chart when you compare hex and shank columns across sizes.
Metric vs UNC thread size
Metric threads list diameter in millimeters and pitch in millimeters per thread; UNC lists nominal inch diameter and threads per inch. They are not interchangeable—taps, dies, and gauges differ.
Read metric vs unc thread context when series labels are unclear.
Use screw size conversion when you must match stocked parts.
M5 specifications and tools
How to choose the right bolt size
Choosing the correct bolt size depends on load, material, and thread type. Larger diameters increase strength, while thread pitch affects holding force.
Use the bolt size chart to compare shank and hex dimensions before you standardize hardware.
Use tap drill size guidance when you plan tapped holes.
Use the thread identifier when stamped sizes are missing.
FAQ
What is the standard pitch for an M5 bolt?
The standard pitch for M5 is 0.8 mm.
What drill size should be used for tapping M5 threads?
For M5 x 0.8 thread, use a 4.2 mm tap drill.
What imperial screw is closest to M5?
#10-24 is the closest imperial equivalent to M5.