M39×3 thread: 39 × 3 mm
Threads › M39×3
M39×3 is an ISO metric fine thread: 39 mm major diameter, 3 mm pitch, 60° form.
| Standard | ISO metric fine |
|---|---|
| Major diameter | 39 mm |
| Pitch | 3 mm |
| Thread angle | 60° |
| Minor diameter, bolt | 35.32 mm |
| Minor diameter, nut | 35.75 mm |
| Tap drill | Not listed. Check your tap maker's chart. |
| Usual class | 6g bolt, 6H nut |
Minor diameters worked out from the basic profile: major Ø − 1.22687 × pitch (bolt) and − 1.08253 × pitch (nut).
Open M39×3 in BenchsmithAdd to order list
What the call-out means
M | ISO metric |
39 | Major diameter, mm |
× 3 | Pitch, mm. Given because it is a fine pitch |
-6g | Bolt tolerance class (usual) |
-6H | Nut tolerance class (usual) |
Measure it
Bolt: Measure across the crests of the bolt with the caliper jaws. Worn bolts read 0.1 to 0.3 under.
Nut or tapped hole: Measure across the tops of the threads inside the nut or hole with the inside jaws. That is the minor Ø. Worn or oversize holes read a little over.
Same diameter, other pitch
- M394 mm pitch
Close in size, won't mate
- 1-1/2-6 UNCØ38.1 mm, 6 TPI
- 1-1/2-12 UNFØ38.1 mm, 12 TPI
- 1-1/2 BSWØ38.1 mm, 6 TPI
- 1-1/2-4 ACMEØ38.1 mm, 4 TPI
- Tr40×7Ø40 mm, 7 mm pitch
One size up or down
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.