Sutton D202LH10M 10 Piece Left Hand Cobalt Jobber Drill Set - Metric
Available
The Sutton D202LH10M is a 10 piece left hand cobalt jobber drill set, 1 to 10 mm in 1 mm steps, supplied in a plastic case. The drills are made from 5% cobalt high speed steel (HSS-Co) with a colour temp finish, 30° left-hand helix flutes (L30) and a 118° standard point, and are made to DIN 338.
Left-hand drills run counter-clockwise, for screw machine applications where the spindle rotates counter-clockwise. The shorter drilling length is designed for rigidity. They can also drill out broken bolts and studs when used with a screw extractor: a left-hand drill tends to back the broken fastener out as it cuts. Each drill is a D202 item, so single replacements can be ordered by the item number in the contents table.
What is in the set
The set contains 10 left-hand drills in a plastic case: 1 to 10 mm in 1 mm steps. 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 | 1 mm | D202 0100 | 12 | 34 |
| 2 | 2 mm | D202 0200 | 24 | 49 |
| 3 | 3 mm | D202 0300 | 33 | 61 |
| 4 | 4 mm | D202 0400 | 43 | 75 |
| 5 | 5 mm | D202 0500 | 52 | 86 |
| 6 | 6 mm | D202 0600 | 57 | 93 |
| 7 | 7 mm | D202 0700 | 69 | 109 |
| 8 | 8 mm | D202 0800 | 75 | 117 |
| 9 | 9 mm | D202 0900 | 81 | 125 |
| 10 | 10 mm | D202 1000 | 87 | 133 |
Where this product is used
- Screw machine and other applications where the spindle rotates counter-clockwise.
- Drilling out broken bolts and studs, together with screw extractors.
- General-purpose drilling in steel, aluminium and copper or brass.
- Materials rated Optimal for this drill: wrought aluminium and magnesium alloys.
- Also rated Effective: annealed high-alloy and tool steel; ferritic / pearlitic grey cast iron; ferritic nodular cast iron; cast aluminium and magnesium alloys (up to 12% Si); aluminium and magnesium cast alloys over 12% Si; copper alloys, brass and bronze; thermosetting and fibre-reinforced plastics; and chilled cast iron.
- Rated Optimal for some grades and Effective for others: non-alloy steels; and low-alloy steels.
Finish
The colour temp finish is a colour-tempered surface that identifies the tool as cobalt high speed steel. The 5% cobalt content improves abrasion and heat resistance for increased strength at higher cutting temperatures.
Cutting speeds and feeds
Cutting speeds (Vc) and feed numbers for the D202 come from the Sutton Application Guide, which covers 18 material groups for this drill. The guide prints the rating as Optimal or Effective, and the table keeps that split. The rpm and feed columns show what the speed and feed number work out to at Ø6 mm and Ø10 mm (speed in rpm = Vc × 1000 ÷ (π × Ø)). Treat these as starting values and adjust for the machine, set-up and coolant.
| Material (VDI 3323 group) | Rating | Vc (m/min) | Feed no. | Ø6 mm: rpm / feed | Ø10 mm: rpm / feed |
|---|---|---|---|---|---|
| Non-alloy steel, about 0.15 %C, annealed | Optimal | 12 | 5 | 635 rpm / 0.125 mm/rev | 380 rpm / 0.19 mm/rev |
| Non-alloy steel, about 0.45 %C, annealed | Optimal | 10 | 5 | 530 rpm / 0.125 mm/rev | 320 rpm / 0.19 mm/rev |
| Non-alloy steel, about 0.45 %C, quenched and tempered | Effective | 8 | 5 | 425 rpm / 0.125 mm/rev | 255 rpm / 0.19 mm/rev |
| Non-alloy steel, about 0.75 %C, annealed | Effective | 8 | 5 | 425 rpm / 0.125 mm/rev | 255 rpm / 0.19 mm/rev |
| Low-alloy steel (under 5% alloying), annealed | Optimal | 8 | 5 | 425 rpm / 0.125 mm/rev | 255 rpm / 0.19 mm/rev |
| Low-alloy steel, quenched and tempered (275 HB) | Effective | 8 | 4 | 425 rpm / 0.1 mm/rev | 255 rpm / 0.16 mm/rev |
| High-alloy and tool steel, annealed | Effective | 8 | 5 | 425 rpm / 0.125 mm/rev | 255 rpm / 0.19 mm/rev |
| Grey cast iron, ferritic / pearlitic | Effective | 12 | 6 | 635 rpm / 0.16 mm/rev | 380 rpm / 0.24 mm/rev |
| Nodular cast iron, ferritic | Effective | 12 | 6 | 635 rpm / 0.16 mm/rev | 380 rpm / 0.24 mm/rev |
| Wrought aluminium and magnesium, non heat treatable | Optimal | 25 | 5 | 1,330 rpm / 0.125 mm/rev | 795 rpm / 0.19 mm/rev |
| Wrought aluminium and magnesium, heat treatable | Optimal | 25 | 5 | 1,330 rpm / 0.125 mm/rev | 795 rpm / 0.19 mm/rev |
| Cast aluminium and magnesium (up to 12% Si), non heat treatable | Effective | 18 | 4 | 955 rpm / 0.1 mm/rev | 575 rpm / 0.16 mm/rev |
| Cast aluminium over 12% Si | Effective | 12 | 6 | 635 rpm / 0.16 mm/rev | 380 rpm / 0.24 mm/rev |
| Copper alloys, free cutting (Pb > 1%) | Effective | 20 | 4 | 1,060 rpm / 0.1 mm/rev | 635 rpm / 0.16 mm/rev |
| Brass (CuZn, CuSnZn) | Effective | 15 | 4 | 795 rpm / 0.1 mm/rev | 475 rpm / 0.16 mm/rev |
| Bronze (CuSn) | Effective | 15 | 4 | 795 rpm / 0.1 mm/rev | 475 rpm / 0.16 mm/rev |
| Thermosetting and fibre-reinforced plastics | Effective | 25 | 3 | 1,330 rpm / 0.08 mm/rev | 795 rpm / 0.125 mm/rev |
| Chilled cast iron | Effective | 10 | 5 | 530 rpm / 0.125 mm/rev | 320 rpm / 0.19 mm/rev |
Feed rates (mm/rev) for the feed numbers above:
| Ø (mm) | Feed no. 3 (mm/rev) | Feed no. 4 (mm/rev) | Feed no. 5 (mm/rev) | Feed no. 6 (mm/rev) |
|---|---|---|---|---|
| 2 | 0.03 | 0.04 | 0.05 | 0.06 |
| 3 | 0.045 | 0.055 | 0.07 | 0.09 |
| 4 | 0.06 | 0.075 | 0.09 | 0.12 |
| 5 | 0.07 | 0.09 | 0.11 | 0.14 |
| 6 | 0.08 | 0.1 | 0.12 | 0.16 |
| 8 | 0.1 | 0.13 | 0.16 | 0.2 |
| 10 | 0.12 | 0.16 | 0.19 | 0.24 |
| 12 | 0.15 | 0.18 | 0.23 | 0.28 |
| 16 | 0.19 | 0.23 | 0.29 | 0.36 |
| 20 | 0.23 | 0.28 | 0.34 | 0.42 |
| 25 | 0.27 | 0.33 | 0.41 | 0.5 |
| 32 | 0.33 | 0.41 | 0.5 | 0.6 |
| 38 | 0.38 | 0.46 | 0.56 | 0.68 |
| 45 | 0.43 | 0.52 | 0.64 | 0.76 |
| 52 | 0.48 | 0.58 | 0.7 | 0.84 |
| 63 | 0.56 | 0.67 | 0.8 | 0.96 |
Drilling notes
- Step feeding or pecking is required for drilling greater than 3 x Ø.
- When drilling a cast or black (not machined) surface, reduce the drilling speed by 20%.
- For hole depths greater than 7 x Ø, pre-drill a pilot hole first for more accurate hole position and to stop the drill wandering. The pilot can be drilled with a short, rigid drill about 3 x Ø deep at reduced feed.
Accuracy
The D202 drill diameter is made to h8 (point tolerance h8): the drill may be at nominal diameter 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 | D202LH10M |
| Catalogue code | D202 (Left Hand Cobalt Jobber Drill) |
| Pieces | 10 |
| Sizes | 1 to 10 mm in 1 mm steps |
| Case | Plastic |
| Material | High Speed Steel Cobalt (HSS Co, 5% cobalt) |
| Finish | Colour temp |
| Flute geometry | 30° left-hand helix (L30) |
| Point | 118° standard |
| Shank | Straight shank (form A) |
| Standard | DIN 338 |
| Diameter tolerance | h8 |
Related drilling products
Compare other Sutton drills: D202 left hand jobber drill (single sizes), D163 DHJ cobalt jobber and D109 SM2 cobalt jobber drill set. Browse all Metric Jobber Drill 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.
Couldn't load pickup availability
Secure Checkout. We do not store credit card details
