M8×1 thread: 8 × 1 mm
Threads › M8×1
M8×1 is an ISO metric fine thread: 8 mm major diameter, 1 mm pitch, 60° form. Tap drill 7 mm. Clearance hole 8.4 mm (close) or 9 mm (normal).
| Standard | ISO metric fine |
|---|---|
| Major diameter | 8 mm |
| Pitch | 1 mm |
| Thread angle | 60° |
| Minor diameter, bolt | 6.77 mm |
| Minor diameter, nut | 6.92 mm |
| Tap drill | 7 mm |
| Clearance hole | 8.4 mm close, 9 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 M8×1 in BenchsmithAdd to order list
What the call-out means
M | ISO metric |
8 | Major diameter, mm |
× 1 | 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
- M81.25 mm pitch
Close in size, won't mate
- Tr8×1.5Ø8 mm, 1.5 mm pitch
- 5/16-18 UNCØ7.94 mm, 18 TPI
- 5/16-24 UNFØ7.94 mm, 24 TPI
- 5/16 BSWØ7.94 mm, 18 TPI
- 5/16-14 ACMEØ7.94 mm, 14 TPI
- G1/16Ø7.72 mm, 28 TPI
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.