M39 Metric Thread Dimensions and Pitch
Below are the key dimensions for M39 metric threads: pitch, tap drill and clearance drill according to ISO 724:2023.
M39 Coarse (standard) |
|---|
| M39 Pitch: 4mm |
| M39 Tap Drill: 35mm |
| M39 Clearance Drill: 42mm |
M39 Metric Thread
Step onto our M39 Metric Thread Page, your ultimate resource for quick assessments on M39 metric threads. We've compiled an extensive collection of data for all standard metric threads you'll need for your parts, outlining crucial metrics like thread pitch, tap drill, and clearance drill. It's a one-stop-shop for engineers, machinists, and hobbyists seeking precise and reliable details.
M39 Coarse Pitch Dimensions
| Nominal Size | d=D | p | r | d2=D2 | d3 | D1 | h3 | H1 | Tap Drill |
|---|---|---|---|---|---|---|---|---|---|
| M39 | 39 | 4 | 0.577 | 36.402 | 34.093 | 34.67 | 2.454 | 2.165 | 35 |
M39 Fine Pitch Dimensions
All dimensions stated in are mm (millimetre)
ISO Metric Thread profile
Major Diameter
The Major Diameter is the largest diameter on the thread and is measured from the thread crest to crest (peak of the thread).
Pitch
This is the distance (mm) from one thread to the next, this can be measured from tip to tip or groove to groove. Pitch can also be defined as TPI, which stands for threads per inch.
Minor Diameter
Minor Diameter is the smallest diameter on the thread and is measured from the thread root to root (Bottom of the thread).
Thread Angle
The angle between the thread faces. 60 degrees in the example above.
Right-Hand Thread
The thread will assemble when rotated clockwise. "righty tighty lefty loosely"
Left-Hand Thread
The thread will assemble when rotated counter-clockwise.
Frequently asked questions
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