Sutton D1760004 4 Piece 120° Spotting Drill Set - HSS-Co TiN - DIN 1897
Available
The Sutton D1760004 is a 4 piece 120° NC spotting drill set (6, 8, 10, 12 mm), made from 5% cobalt high speed steel (HSS-Co) with a TiN coating. The drills have straight shanks (shank form A) and are made to DIN 1897.
It is a precision set for machine use. The rigid design is for “seat” position accuracy, and the 120° point suits spotting ahead of a drill because it matches a typical drill point. Only drill to the depth of the point. Each drill is a D176 item, so single replacements can be ordered by the item number in the contents table.
What is in the set
The set contains 4 spotting drills: 6, 8, 10, 12 mm. Flute length (l2) and overall length (l1) are in millimetres.
| Piece | Drill size | Replacement item no. | Flute length l2 (mm) | Overall length l1 (mm) |
|---|---|---|---|---|
| 1 | 6 mm | D176 0600 | 25 | 66 |
| 2 | 8 mm | D176 0800 | 29 | 79 |
| 3 | 10 mm | D176 1000 | 32 | 89 |
| 4 | 12 mm | D176 1200 | 32 | 102 |
Where this product is used
- Spotting for a drill to follow: the 120° point matches a typical drill point.
- NC and CNC machine drilling, where the position of the hole is set by the spot.
- Workshop and machining kit: one set covering 6 to 12 mm.
- Materials rated Optimal for this drill: austenitic stainless steel; duplex stainless steel; wrought aluminium and magnesium alloys; and cast aluminium and magnesium alloys (up to 12% Si).
- Also rated Effective: annealed high-alloy and tool steel; ferritic and martensitic stainless steels; precipitation-hardening stainless steel; malleable cast iron; aluminium and magnesium cast alloys over 12% Si; thermosetting and fibre-reinforced plastics; Fe-based high-temperature alloys; annealed Ni / Co based high-temperature alloy, age-hardened Ni / Co based high-temperature alloy; titanium alpha alloys, annealed titanium alpha / beta alloys, annealed titanium beta alloys; hardened steel (45 HRC); and chilled cast iron.
- Rated Optimal for some grades and Effective for others: non-alloy steels; low-alloy steels; grey cast iron; nodular cast iron; and copper alloys, brass and bronze.
Finish
Titanium nitride (TiN) is a single-layer coating with a microhardness of 2300 HV and thermal stability to about 600 °C (1112 °F). It is a general-purpose coating for a wide range of materials, and is designed to give longer tool life than an uncoated tool and allow higher speeds and feeds.
Spot depth
A spotting drill makes a conical spot, so the depth of the spot is set by the point angle. For a 120° point the depth of the cone is spot diameter ÷ 3.46 (calculated from the point angle). The spot can be as large as the diameter of the drill itself.
| Spot diameter (mm) | Depth of point cone (mm) |
|---|---|
| 2 | 0.58 |
| 3 | 0.87 |
| 4 | 1.15 |
| 5 | 1.44 |
| 6 | 1.73 |
| 8 | 2.31 |
| 10 | 2.89 |
| 12 | 3.46 |
Drilling notes
- Drill only to the depth of the point.
- For optimal positional accuracy and hole size, spot the hole first.
- No separate speed table is published for the spotting drills. Use the D163 DHJ cobalt jobber drill speed table at the same diameter as a sensible reference for starting speed, adjusted for the machine, set-up and coolant.
Accuracy
The drill diameter (d1) tolerance is h8 and the shank tolerance is h9. An h8 drill diameter may be at nominal or smaller, never larger.
| Drill diameter (mm) | h8 tolerance (minus only, ISO 286-2) |
|---|---|
| 0.2 to 3 | 14 µm |
| 3 to 6 | 18 µm |
| 6 to 10 | 22 µm |
| 10 to 18 | 27 µm |
| 18 to 30 | 33 µm |
| 30 to 50 | 39 µm |
Troubleshooting
- Drill breaks. Dull point: sharpen; Drill has front taper due to wearing: sharpen; Insufficient lip clearance on point: grind correctly; Lip clearance too great: regrind to correct clearance angle.
- Outer corner breaks down. Flutes clogged with chips: remove drill from hole and clear the flutes; Cutting speed too high: reduce speed; Dry cutting, no lubricant at cutting edges: apply cutting fluid.
- Cutting edges chip. Lip clearance too great: regrind to correct clearance angle; Feed too heavy: reduce feed.
- Hole rough. Dull point: sharpen; Feed too heavy: reduce feed; Dry cutting, no lubricant at cutting edges: apply cutting fluid; Fixture/clamping not rigid: secure job firmly.
- Hole oversize. Unequal angle or uneven length of cutting edges: regrind to same lip lengths and angles; Spindle run-out / loose spindle: check machine.
Key specifications
| Specification | Detail |
|---|---|
| Set number | D1760004 |
| Catalogue code | D176 (120° NC Spotting Drill) |
| Pieces | 4 |
| Sizes | 6, 8, 10, 12 mm |
| Material | High Speed Steel Cobalt (HSS Co, 5% cobalt) |
| Finish | Titanium nitride (TiN) |
| Point | 120° |
| Shank | Straight shank (form A) |
| Standard | DIN 1897 |
| Drill diameter tolerance (d1) | h8 |
| Shank tolerance | h9 |
| Designation | N |
Related drilling products
Compare other Sutton drills: D176 120° spotting drill (single sizes), D175 90° spotting drill, D365 142° carbide spotting drill and D151 CNC stub drill. Browse all Spotting Drill Bit Sets. Need help choosing? Our guide to choosing the right drill bit and drill bit selection guide cover drill types and materials, and the speeds and feeds chart and cutting tool troubleshooting guide cover speeds and common problems.
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