How do I know what size spanner I need?
Modern spanner sizes refer to the distance across the flats of the hexagonal nut or bolt they would fit. A 17mm spanner therefore fits a nut 17mm across its flats and this is normally a nut to fit a 10mm diameter bolt (M10).
How do you calculate the spanner size of a bolt?
If the bolt size is up to M14,
- Spanner size =(Bolt size*1.5)+1.
- Eg. If Bolt size is M8, Then spanner size is (8*1.5)+1 =13.
- If bolt size is above M14,
- Spanner size = (Bolr size *1.5)
- Eg. If bolt size is M16, Then spanner size is (16*1.5) = 24.
What size bolt is a 12mm head?
Metric Shoulder Bolt Dimensions
| Shoulder Diameter (A) | Thread (C) | Head Diameter (E) |
|---|---|---|
| 8mm | 6mm x 1.0 | 13mm |
| 10mm | 8mm x 1.25 | 16mm |
| 12mm | 10mm x 1.5 | 18mm |
| 16mm | 12mm x 1.75 | 24mm |
What diameter is M12?
Thread Geometry – Metric Coarse
| Thread | Major Diameter | Pitch Diameter |
|---|---|---|
| M12 | 12.0 | 10.863 |
| M14 | 14.0 | 12.701 |
| M16 | 16.0 | 14.701 |
| M18 | 18.0 | 16.376 |
What size thread is a 12mm nut?
| Product details | |
|---|---|
| Diameter: | 12mm |
| Thread pitch: | 1.75mm |
| Width across the flats: | 19mm |
| Width across the flats Min: | 18.67mm |
What size hole do I need for an M12 bolt?
Metric Threads
| Thread | Drill size for tapping standard metric threads | Clearance hole |
|---|---|---|
| M8 | 6.8 | 9 |
| M10 | 8.5 | 11 |
| M12 | 10.2 | 13.5 |
| M14 | 12 | 15.5 |
What is 11mm in standard?
Metric / Standard Wrench Conversion Chart
| Bolt Diameter | Metric | Standard |
|---|---|---|
| 1/4″ | 11mm | 7/16″ |
| 5/16″ | 13mm | 1/2″ |
| 3/8″ | 14mm | 9/16″ |
| 7/16″ | 16mm | 5/8″ |
