How To Read Locating Hole Notation
A pattern such as 4-11-63 normally means 4 locating holes, 11mm hole diameter and 63mm pitch circle diameter. Some blades use more than one locating hole pattern, so a drawing or sample blade is the safest confirmation.
Common Reference Table
| Blade Specification | Common Locating Hole | Observed Alternatives |
|---|---|---|
| 250*32*2.0/1.7(1.75) | 4-11-63 | 4-9-50 |
| 285*32*2.0/1.7(1.75) | 4-11-63 | 4-9-50 |
| 285*40*2.0/1.75 | 4-11-80 | |
| 300*32*2.0/1.7(1.75) | 4-11-63 | 4-9-50 |
| 315*32*2.25/2.0 | 4-11-63 | 4-9-50 |
| 315*40*2.25/2.0 | 4-11-90; 4-15-80 | |
| 330*32*2.25/2.0 | 4-11-63 | 4-9-50 |
| 360*32*2.6/2.25 | 4-11-63 | 4-9-50 |
| 360*40*2.6/2.25 | 4-11-90; 4-16-80 | |
| 400*50*2.6/2.25 | 4-12.8-90; 2-16-80 | |
| 425*50*2.7/2.25 | 4-11-90; 4-16-80 | 2-14-90; 2-21-90 |
| 460*50*2.7/2.25 | 4-14-90; 4-21-90 | 4-11-90; 2-14-90; 2-21-90; 4-16-80 |
| 520*50*3.0/2.5 | 4-14-90; 2-11-90; 2-16-80 | 4-17-90; 4-16-80 |
| 560*50 | 4-21-120 | 4-20-90 |
| 630*80*3.4/2.7 | 4-22-120; 4-23-160 | 4-23-120; Apollo equipment reference |
What To Confirm Before Production
Confirm outer diameter, bore, plate thickness, kerf, number of locating holes, hole diameter, PCD, rotation direction and whether the machine flange has special grooves or pin positions.
Best Evidence To Send
Send a clear photo of the old blade, a close-up of the bore and locating holes, the machine flange photo, a hand drawing with measurements or the original blade drawing. This avoids wrong fit and production delay.