CoroDrill® 861
CoroDrill® 861 provides the high stability essential for drilling deep holes, with high speed and efficiency, up to 30xD.
Excellent chip evacuation
ACM (Advanced Chip Management) flute geometry ensures sufficient flute space along the whole length of the tool and encourages small and manageable chips. Unique surface treatment provides a very smooth surface in the flutes to decrease torque.
Accurate, deep holes
Accurate deep holes to depths of up to 30 × drill diameter, without pecking
Greater productivity
High speeds and feeds allow greater productivity to reduce cost per hole
- Achievable hole tolerance H8−H9
- Drilling depths: 12−30 × drill diameter
- Clamp with high precision chucks only
- A wide range of workpiece materials
- Conventional drilling, cross holes, angled faces
- Automotive: crankshafts, engine blocks, cylinder heads
Product variants
861-GP
- Recommended to use on drill lengths above 12xD
- Shallow point angle, 150°Initial contact with the chisel of the deep hole drillBetter point location – improves centringLess wear – prevents secondary chisel damageIncreased accuracy
- Body tolerance p7Creating a bushing effect without interference fitPrevents outer corner damage
861-GM
- For drilling deep holes to depths up to 30xD diameter without pecking
- Covering a wide range of materials
- Proven application method for cross holes and angled face drilling
- Includes pilot drill
- Depth and diameter capability12xD, Ø 3.0 – 20.0 mm (0.118 – 0.787 inch)15xD, Ø 3.0 – 12.0 mm (0.118 – 0.472 inch)20xD, Ø 3.0 – 12.0 mm (0.118 – 0.472 inch)30xD, Ø 3.0 – 8.0 mm (0.132 – 0.315 inch)
- Hole tolerance IT8 – IT9
- Grade GC34
- Internal coolant
CoroChuck 930
Use CoroChuck 930 with your CoroDrill 861 to maintain efficient production through quick and easy tool set ups and changes.
Deep hole - Drilling strategy
For maximum performance and productivity, Sandvik Coromant recommend applying a machining strategy when using CoroDrill 861-GM.
Highlights
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Reconditioning
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Sandvik Coromant UK
+44 (0)121 368 0305