| Model | Size | Hole Range | Top-Sub Thread (pin) | Bit Shank Options | GMP Bit Models |
|---|
| GMP-DHD35 | 3½" | 89–110 mm | API 2-3/8" Reg | DHD3.5 | GMP-B4 |
| GMP-DHD4 | 4" | 105–130 mm | API 2-3/8" Reg | DHD340A · QL40 · SD4 | GMP-B43 |
| GMP-DHD43 | 4¾" | 121–135 mm | API 2-3/8" Reg | DHD340A · QL40 | GMP-B43 |
| GMP-DHD5 | 5" | 130–152 mm | API 3½" Reg | DHD350R · QL50 | On request |
| GMP-DHD6 | 6" | 152–178 mm | API 3½" Reg | DHD360 · QL60 · SD6 | GMP-B65 · B7 · B725 · B75 |
| GMP-DHD65 | 6½" | 165–190 mm | API 3½" Reg | DHD360 · QL60 · SD6 | GMP-B65 · B7 · B725 · B75 |
| GMP-DHD7 | 7" | 178–203 mm | API 3½" / 4½" Reg | Specify when ordering | Matched to order |
| GMP-DHD8 | 8" | 203–254 mm | API 4½" Reg | DHD380 · QL80 · SD8 | GMP-B8 |
EN24/EN36
Alloy Steel Grade
10–25 bar
Working Pressure Range
API Reg
Top-Sub Thread (pin)
7–15 days
Custom Order Lead Time
A hammer's size is the smallest hole it drills; larger bits drill up to the range shown. OD, length, weight and air consumption for each model are on our model data sheet — available on request.
| Model | Size | Bit Ø | GMP Hammers | Fits Other Brands' Hammers (shank — hammer models) |
|---|
| GMP-B4 | 4" | 102 mm | GMP-DHD35 | DHD3.5 — Atlas Copco / Epiroc COP 35 · Mincon 3½" |
| GMP-B43 | 4¾" | 121 mm | GMP-DHD4 · DHD43 | DHD340A — Atlas Copco / Epiroc COP 44 · Numa Champion 40 · Mincon 4HR
QL40 — Sandvik RH460 (QLX40)
SD4 — Sandvik SD4 |
| GMP-B65 | 6½" | 165 mm | GMP-DHD6 · DHD65 | DHD360 — Atlas Copco / Epiroc COP 64 · Mincon 6DH360
QL60 — Epiroc COP 64 Gold · Atlas Copco QL60 · Mincon 6DH
SD6 — Sandvik SD6 |
| GMP-B7 | 7" | 178 mm | GMP-DHD6 · DHD65 | DHD360 — Atlas Copco / Epiroc COP 64 · Mincon 6DH360
QL60 — Epiroc COP 64 Gold · Atlas Copco QL60 · Mincon 6DH
SD6 — Sandvik SD6 |
| GMP-B725 | 7¼" | 184 mm | GMP-DHD6 · DHD65 | DHD360 — Atlas Copco / Epiroc COP 64 · Mincon 6DH360
QL60 — Epiroc COP 64 Gold · Atlas Copco QL60 · Mincon 6DH
SD6 — Sandvik SD6 |
| GMP-B75 | 7½" | 190 mm | GMP-DHD6 · DHD65 | DHD360 — Atlas Copco / Epiroc COP 64 · Mincon 6DH360
QL60 — Epiroc COP 64 Gold · Atlas Copco QL60 · Mincon 6DH
SD6 — Sandvik SD6 |
| GMP-B8 | 8" | 203 mm | GMP-DHD8 | DHD380 — Atlas Copco / Epiroc COP 84 · Numa P80 · Mincon 8DH
QL80 — Atlas Copco QL80
SD8 — Sandvik SD8 |
| GMP-OB9 OB | OB 9" | 229 mm | Casing system | Made to suit your overburden casing system — send us its make and size. |
| GMP-OB95 OB | OB 9½" | 241 mm | Casing system | Made to suit your overburden casing system — send us its make and size. |
YG8/YG11C
Carbide Button Grade
3 Profiles
Flat · Concave · Convex
4 Shanks
DHD · QL · SD · Mission
OB System
Overburden Drilling
How to choose: find your hammer — ours or another brand — then pick the hole size you need. Quote the model and shank, e.g. GMP-B65, DHD360 shank. All button bits come in flat, concave or convex face. OB = overburden bits for casing advancement in loose or unstable ground.
Other brand and model names are trademarks of their respective owners, shown only to indicate shank compatibility; GM Pneumatics is not affiliated with them.
