Martin D80E68 Type C3 Double Strand Solid Bushed Roller Chain Sprocket, 0.875 to 3.313 in Dia Bore, 22.23 in OD, #80 Chain, 68 Teeth, 1 in Pitch, Steel
QD (quick detachable) is a sprocket where a tapered bushing is bolted into the taper bore that is machined in the sprocket. When installed this bushing is compressed onto the shaft providing a tight grip.
Martin Roller Chain Sprocket, Type C3 Double Strand Solid Bushed, 0.875 to 3.313 in Bore, 22.23 in OD, #80 Chain, 68 Teeth, 1 in Pitch, 21.653 in Pitch Diameter, 6-1/4 in Diameter Hub, 1.71 in Length Through Bore, QD® E Bushing, Steel
| Bushing Type | : | QD® E |
| Bore Diameter | : | 0.875 to 3.313 in |
| Outside Diameter | : | 22.23 in |
| Chain Size | : | #80 |
| Number of Teeth | : | 68 |
| Pitch | : | 1 in |
| Material | : | Steel |
| Hub Diameter | : | 6-1/4 in |
| Type | : | Type C3 Double Strand Solid Bushed |
| Length Through Bore | : | 1.71 in |
| Pitch Diameter | : | 21.653 in |
VIDEO LINK
https://www.youtube.com/watch?v=fSomOMNB_-Q