- Product category：Conventional PDC Bits
- Name：8-1/2"ST615
- Product Type：08711
- Hits：1550
Introduction
8-1/2" ST615/ M223
Recommended Operating Parameters
| Blade Count | 5 Sprial Blades |
| Primary Cutter Size | Ф16 mm |
| Face Cutters（Count） | Ф16 mm ( 16 ) |
| Cone Cutters（Count） | Ф16 mm ( 6 ) |
| Gauge Cutters（Count） | Ф16 mm ( 9 ) |
| Back-Up Cutters（Count） | Ф13 mm ( 15 ) |
| Nozzles | 5 Standard Series (SP) |
| Gauge Length | 2.5", Options available |
| Junk Slot Area | 15 in2 |
| Bit Connection | 4-1/2" API REG |
| Bit Length | Make-Up: 11.8" Overall: 16.1" |
| Fishing Neck | Diameter: 6.8" Length: 5.4" |
Recommended Operating Parameters
| Flow Rate | 21~38 LPS |
| Rotary Speed | 60~330 RPM |
| Weight-on-Bit | 20~110 KN |
| Max. Weight-on-Bit | 130 KN |
| Make-Up Torque | 16.6~23.7KN.m |