Surface Set Core Bits
Surface Set Core Bits
Roschen's line of surface set core bits meets the needs of drilling companies operating in differing ground conditions. With a choice of diamond grades ranging from coarse to fine, and a variety of profiles, choosing the appropriate surface set core bit is now easier than ever.
The following chart describes the main grades if diamonds available. Please note that the grade represents the number of stones per carat (SPC) and not the quality of the stones. Other grades of diamonds are also available for custom orders.
Choose a synthetic diamond tool for a more economical solution or opt for a natural diamond if you need greater cutting ability. For drilling in hard to very hard ground, a diamond impregnated crown is always a good choice. Whatever the case, you can always count on one of our representatives to help you pick the best product for your needs.
Profiles
SEMI-ROUND
Standard profile, ideal for most ground conditions.
ROUND
Preferred profile for harder, abrasive ground conditions with rocks.
STEP
A profile that provides a faster rate of penetration, but is a bit more fragile especially in fractured ground. Generally used with wireline core barrel systems.
PILOT
A profile that provides good stability, and a good rate of penetration and recovery. Ideal for soft to medium ground.
ANGLED PILOT
A very durable profile that provides good stability. Ideal for ground that is very fractured.
FACE DISCHARGE
A profile that helps in the recovery of core samples in very fragile ground.
| Wireline diamond core bits specifications | ||
| SIZE | CORE Ø | HOLE Ø |
| AQTK | 35.5 mm (1-3/8 in) | 48 mm (1-7/8 in) |
| BQ | 36.4 mm (1-7/16 in) | 60 mm (2-3/8 in) |
| BQTK | 40.7 mm (1-5/8 in) | 60 mm (2-3/8 in) |
| NQ | 47.6 mm (1-7/8 in) | 75.7 mm (3 in) |
| NQTK (NQ2") | 50.6 mm (2 in) | 75.7 mm (3 in) |
| NQ3 | 45 mm (1-3/8 in) | 75.7 mm (3 in) |
| HQ | 63.5 mm (2-1/2 in) | 96 mm (3-3/8 in) |
| HQ3 | 61.1 mm (2-3/8 in) | 96 mm (3-3/8 in) |
| PQ3 | 85 mm (3-3/8 in) | 122.6 mm (4-7/8 in) |
| PQ3 | 83 mm (3-1/4 in) | 122.6 mm (4-7/8 in) |
Best regards,
Phiger Leo
Direct Line: 0086-137-6419 5009
WeChat/WhatsApp:: +86-137-6419 5009
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ROSCHEN@ GROUP LIMITED
ROBERT ROSCHEN@ LIMITED
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HEFEI ROSCHEN@ TOOL CO., LTD.
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SHANGHAI ROSCHEN@ INTERNATIONAL CO., LTD.
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