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Explore MSD 8 inch DTH bits in 203–305 mm diameters with MSD8A, DHD380, QL80, MISSION80, and SD8 shanks. Compare configurations.
MSD supplies 8 inch DTH bits with MSD8A, DHD380, QL80, MISSION80, and SD8 shank options, covering confirmed bit diameters from 203 to 305 mm. The listed configurations include concave and convex-concave face designs, with differences in button layouts, button shapes, spline counts, and weights across the available shanks and diameters.
| Image | Diameter (mm) | Face Design | Gauge Buttons | Front Buttons | Button Shape | Splines | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 203 | Concave Face | 10×Ø18 mm | 4×Ø18 mm + 10×Ø16 mm | Domed | 10 | 48.5 | |
| 216 | Concave Face | 10×Ø18 mm | 4×Ø18 mm + 10×Ø16 mm | Domed | 10 | 52.1 | |
| 230 | Concave Face | 12×Ø18 mm | 12×Ø18 mm + 6×Ø16 mm | Domed | 10 | 54.8 | |
| 235 | Concave Face | 12×Ø18 mm | 12×Ø18 mm + 6×Ø16 mm | Domed | 10 | 55.5 | |
| 254 | Concave Face | 12×Ø18 mm | 12×Ø18 mm + 8×Ø16 mm | Domed | 10 | 62.4 | |
| 275 | Convex-Concave Face | 12×Ø18 mm | 8×Ø16 mm + 19×Ø16 mm | Domed | 10 | 69 | |
| 305 | Convex-Concave Face | 15×Ø18 mm | 12×Ø16 mm + 23×Ø16 mm | Domed | 10 | 77.6 |
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Read MoreMSD supplies 8 inch DTH bits with MSD8A, DHD380, QL80, MISSION80, and SD8 Bit Shank options. The confirmed product range includes 203, 216, 230, 235, 254, 275, and 305 mm bit diameters.
The listed configurations include concave and convex-concave face designs. Gauge-button and front-button configurations vary mainly by diameter, button shape and spline count vary by Bit Shank, and weight varies by both diameter and Bit Shank. The complete configuration should therefore be checked rather than selecting the bit from the nominal 8 inch classification alone.
The confirmed 8 inch DTH bit range includes five Bit Shank options: MSD8A, DHD380, QL80, MISSION80, and SD8.
Each Bit Shank group is currently listed in 203, 216, 230, 235, 254, 275, and 305 mm diameters.
The required Bit Shank must be confirmed against the exact DTH hammer model or the existing drilling system. A similar nominal hammer or bit size does not establish that different Shank systems are interchangeable.
203 and 216 mm configurations — Use a Concave Face, 10 × Ø18 mm Gauge Buttons, and 4 × Ø18 mm plus 10 × Ø16 mm Front Buttons.
230 and 235 mm configurations — Use a Concave Face, 12 × Ø18 mm Gauge Buttons, and 12 × Ø18 mm plus 6 × Ø16 mm Front Buttons.
254 mm configurations — Use a Concave Face, 12 × Ø18 mm Gauge Buttons, and 12 × Ø18 mm plus 8 × Ø16 mm Front Buttons.
275 mm configurations — Use a Convex-Concave Face and 12 × Ø18 mm Gauge Buttons. They use 27 × Ø16 mm Front Buttons in total.
305 mm configurations — Use a Convex-Concave Face and 15 × Ø18 mm Gauge Buttons. They use 35 × Ø16 mm Front Buttons in total.
The exact grouped notation for the 275 and 305 mm Front Buttons should be checked in the parameter table for the selected Bit Shank.
The 203–254 mm configurations use Concave Face designs, while the 275 and 305 mm configurations use Convex-Concave Face designs. Gauge-button quantities and Front Button configurations also change as the listed diameter increases.
MSD8A and DHD380 — Listed with Domed buttons and 10 splines.
QL80 — Listed with Domed buttons and 16 splines.
MISSION80 — Listed with Spherical buttons and 12 splines.
SD8 — Listed with Spherical buttons and 8 splines.
The parameter table uses Domed and Spherical as distinct button-shape descriptions.
The listed weights vary by both diameter and Bit Shank:
MSD8A and DHD380 — 48.5–77.6 kg.
QL80 — 48.2–77.3 kg.
MISSION80 — 41.2–71.3 kg.
SD8 — 41.3–70.5 kg.
The nominal 8 inch classification is only the first selection step. The DTH bit must use the Bit Shank required by the exact hammer model. The confirmed pairings are MSD8A hammer with MSD8A shank, DHD380 with DHD380, QL80 with QL80, M80 with MISSION80, and SD8 with SD8.
Bit Shank matching alone does not confirm the complete configuration. The selected bit diameter must also be checked against the confirmed hole range of the exact hammer model. The current hammer data confirms Ø198–254 mm for MSD8A, Ø195–254 mm for DHD380, Ø195–254 mm for QL80, Ø195–245 mm for M80, and Ø195–254 mm for SD8.
The listed 203, 216, 230, and 235 mm configurations fall within the confirmed hole ranges of all five corresponding hammer models.
The 254 mm MISSION80 configuration and all listed 275 and 305 mm configurations are not covered by the confirmed hole ranges of the five current 8 inch hammer models shown on MSD's hammer page. They require separate confirmation against another verified hammer configuration, special system, or project requirement.
They should not be assumed to match solely because the nominal size or Bit Shank designation is the same.
For replacement orders, provide the complete hammer model, current bit marking, required Bit Shank, required bit diameter, finished hole diameter, and product photos or drawings before the configuration is confirmed.
These 8 inch DTH bit configurations may be reviewed for mining blast-hole, water-well, construction, foundation, and infrastructure drilling projects where the required diameter and complete drilling system are suitable.
Final selection should be based on the exact hammer model, Bit Shank, confirmed hole range, rock formation, drill string, rig, compressor, and operating conditions. The current parameter data does not assign a specific Face Design or Button Shape to a particular formation or guarantee a particular drilling result.
To confirm a suitable 8 inch DTH bit, provide the following information:
Required Bit and Finished Hole Diameter — Required bit diameter and finished hole diameter in millimeters.
DTH Hammer Model — Exact hammer model used in the drilling system.
Bit Shank — Required MSD8A, DHD380, QL80, MISSION80, or SD8 Shank.
Current Product Information — Current bit model or marking, where available.
Reference Materials — Photos or drawings of the current bit and Shank.
Required Configuration — Required Face Design, Button Layout, or other configuration details, if already known.
Working Conditions — Rock formation, abrasiveness, drilling application, hole depth, and drill-rig model. Also provide compressor rated pressure and discharge capacity when MSD is reviewing the hammer and complete drilling system.
Order Requirement — Required quantity.
For replacement orders, the existing hammer model, Bit Shank, current bit details, and confirmed hammer hole range should take priority over the general 8 inch classification.
MSD is a China-based manufacturer of rock drilling tools supplying DTH hammers, DTH drill bits, drilling components, and related products.
MSD focuses on reliable quality, correct tool selection, and technical support. The objective is not only to supply a bit in the requested diameter, but also to help confirm the appropriate hammer model, Bit Shank, diameter, and configuration for the customer's drilling system, helping reduce mismatch risk, unnecessary downtime, and the overall drilling cost per meter.
Technical content reviewed by MSD Engineering Team. | MSD — 23+ years of rock drilling tools manufacturing expertise | ISO 9001 Certified | Exporting to 40+ countries
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