M30×1.5 thread: 30 × 1.5 mm
Threads › M30×1.5
M30×1.5 is an ISO metric fine thread: 30 mm major diameter, 1.5 mm pitch, 60° form. Clearance hole 31 mm (close) or 33 mm (normal).
| Standard | ISO metric fine |
|---|---|
| Major diameter | 30 mm |
| Pitch | 1.5 mm |
| Thread angle | 60° |
| Minor diameter, bolt | 28.16 mm |
| Minor diameter, nut | 28.38 mm |
| Tap drill | Not listed. Check your tap maker's chart. |
| Clearance hole | 31 mm close, 33 mm normal |
| 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 M30×1.5 in BenchsmithAdd to order list
What the call-out means
M | ISO metric |
30 | Major diameter, mm |
× 1.5 | 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
Close in size, won't mate
- Tr30×6Ø30 mm, 6 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.