M9 Bolt Size and Thread Specifications
What is an M9 bolt?
An M9 bolt has 9 mm nominal diameter with typical coarse pitch 1.25 mm. It bridges M8 and M10 but is less common in general hardware assortments.
M9 is an intermediate metric size that is not as widely stocked as M8 or M10. Always verify pitch and strength class against the original part. Spanish reference: perno M9.
Specifications
| Specification | Value |
|---|---|
| Nominal diameter | 9 mm |
| Standard pitch (coarse) | 1.25 mm |
| Fine pitch | 1.0 mm |
| Tap drill size | 7.8 mm |
| Closest imperial equivalent | between M8 and M10 |
Hex head size
| Bolt size | Hex head size |
|---|---|
| M9 | 14 mm |
Common uses
Imported machinery, specialty equipment, and applications where documentation specifies M9.
Related tools
Related charts
FAQ
What is the standard pitch for an M9 bolt?
The common coarse pitch for M9 is 1.25 mm. Fine pitch is often 1.0 mm where specified.
What drill size should be used for tapping M9 threads?
For M9 x 1.25 coarse thread, use approximately a 7.8 mm tap drill. Use our Tap Drill Calculator for other pitches.
What imperial fastener is closest to M9?
between M8 and M10 is a practical reference for comparing M9 to inch hardware; verify fit for your application.
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