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D371 Sutton Tools Carbide Bit - 12xD - R30 - IK
D371 Sutton Tools Carbide Bit - 12xD - R30 - IK
D371 Sutton Tools Carbide Bit - 12xD - R30 - IK
D371 Sutton Tools Carbide Bit - 12xD - R30 - IK

Sutton D371 0300 3mm 12xD Solid Carbide Drill, AlCrN tip, Internal Coolant

$637.00
$637.00
Inc. GST

Available

The Sutton D371 is a 12xD solid carbide (VHM) drill with internal coolant supply, a 30° right-hand helix (R30) and a 135° Form C point. It carries an AlCrN tip coating, has an HA shank to DIN 6535 and is for materials up to 1200 N/mm². This range has 83 sizes from 3 to 12 mm.

The strong core and the micro geometry and surface conditioning are designed for optimal chip control, and the internal coolant supply carries coolant to the cutting edges through the drill. The AlCrN tip finish is designed for maximum tool life. The drill diameter (d1) tolerance is m7 and the shank diameter (d2) tolerance is h6. At 12xD this is the long-reach drill in the carbide internal-coolant family, for deeper holes than the 3xD to 8xD drills.

Where this product is used

  • Deep-hole drilling to 12 × Ø with internal coolant, in toolroom, machine shop, production, maintenance and fabrication work.
  • Materials up to 1200 N/mm², including steels, stainless steels and cast irons, with the material groups rated in the speed table below.
  • Rated Optimal in the application guide: non-alloy steels; low-alloy steels; high-alloy and tool steels.
  • Rated Effective: austenitic stainless steel; duplex stainless steel; malleable cast iron; chilled and hardened cast iron.
  • Rated Optimal for some grades and Effective for others: grey cast iron; nodular cast iron.
  • Hole depths to 12 × Ø. Step feeding or pecking is required beyond 3 × Ø.

Design features

  • 12xD solid carbide drill with internal coolant supply.
  • Strong core with micro geometry and surface conditioning for optimal chip control.
  • AlCrN tip for maximum tool life.
  • R30: 30° right-hand helix.
  • 135° Form C point.
  • HA shank to DIN 6535; d1 tolerance m7, d2 tolerance h6.
  • For materials up to 1200 N/mm².
  • 83 sizes from 3 to 12 mm.

Finish

AlCrN (aluminium chromium nitride) tip coating. AlCrN has a microhardness of 3200 HV and thermal stability up to about 1100 °C (2012 °F). It suits low-alloy and high-tensile steels, hardened steels up to 54 HRC, high-speed machining, and minimum quantity lubrication (MQL) or dry machining.

Sizes and item numbers

Every size in this range, with its Sutton item number. The inch column shows the fractional equivalent where the size has one. Lengths are in millimetres.

Item no. Ø d1 (mm) Ø (in) Overall length l1 (mm) Flute length l2 (mm) Shank d2 (mm)
D371 0300 3 - 90 50 6
D371 0310 3.1 - 90 50 6
D371 0320 3.2 - 90 50 6
D371 0330 3.3 - 90 50 6
D371 0350 3.5 - 90 50 6
D371 0360 3.6 - 90 50 6
D371 0370 3.7 - 90 50 6
D371 0380 3.8 - 102 64 6
D371 0390 3.9 - 102 64 6
D371 0400 4 - 102 64 6
D371 0410 4.1 - 102 64 6
D371 0420 4.2 - 102 64 6
D371 0430 4.3 - 102 64 6
D371 0440 4.4 - 102 64 6
D371 0450 4.5 - 102 64 6
D371 0460 4.6 - 102 64 6
D371 0470 4.7 - 102 64 6
D371 0480 4.8 - 116 78 6
D371 0490 4.9 - 116 78 6
D371 0500 5 - 116 78 6
D371 0510 5.1 - 116 78 6
D371 0520 5.2 - 116 78 6
D371 0530 5.3 - 116 78 6
D371 0540 5.4 - 116 78 6
D371 0550 5.5 - 116 78 6
D371 0560 5.6 - 116 78 6
D371 0570 5.7 - 116 78 6
D371 0580 5.8 - 116 78 6
D371 0590 5.9 - 116 78 6
D371 0600 6 - 116 78 6
D371 0610 6.1 - 146 108 8
D371 0620 6.2 - 146 108 8
D371 0630 6.3 - 146 108 8
D371 0640 6.4 - 146 108 8
D371 0650 6.5 - 146 108 8
D371 0660 6.6 - 146 108 8
D371 0670 6.7 - 146 108 8
D371 0680 6.8 - 146 108 8
D371 0690 6.9 - 146 108 8
D371 0700 7 - 146 108 8
D371 0710 7.1 - 146 108 8
D371 0720 7.2 - 146 108 8
D371 0730 7.3 - 146 108 8
D371 0740 7.4 - 146 108 8
D371 0750 7.5 - 146 108 8
D371 0760 7.6 - 146 108 8
D371 0770 7.7 - 146 108 8
D371 0780 7.8 - 146 108 8
D371 0790 7.9 - 146 108 8
D371 0800 8 - 146 108 8
D371 0810 8.1 - 162 120 10
D371 0820 8.2 - 162 120 10
D371 0830 8.3 - 162 120 10
D371 0840 8.4 - 162 120 10
D371 0850 8.5 - 162 120 10
D371 0860 8.6 - 162 120 10
D371 0870 8.7 - 162 120 10
D371 0880 8.8 - 162 120 10
D371 0890 8.9 - 162 120 10
D371 0900 9 - 162 120 10
D371 0910 9.1 - 162 120 10
D371 0920 9.2 - 162 120 10
D371 0930 9.3 - 162 120 10
D371 0940 9.4 - 162 120 10
D371 0950 9.5 - 162 120 10
D371 0960 9.6 - 162 120 10
D371 0970 9.7 - 162 120 10
D371 0980 9.8 - 162 120 10
D371 0990 9.9 - 162 120 10
D371 1000 10 - 162 120 10
D371 1010 10.1 - 204 156 12
D371 1020 10.2 - 204 156 12
D371 1030 10.3 - 204 156 12
D371 1040 10.4 - 204 156 12
D371 1050 10.5 - 204 156 12
D371 1060 10.6 - 204 156 12
D371 1080 10.8 - 204 156 12
D371 1090 10.9 - 204 156 12
D371 1100 11 - 204 156 12
D371 1110 11.1 - 204 156 12
D371 1150 11.5 - 204 156 12
D371 1160 11.6 - 204 156 12
D371 1200 12 - 204 156 12

Cutting speeds and feeds

The application guide gives cutting speeds (Vc) and feed numbers for this drill, with Optimal ratings in bold and Effective ratings in regular type; the Rating column shows the same 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 (125 HB) Optimal 80 8 4,240 rpm / 0.24 mm/rev 2,550 rpm / 0.37 mm/rev
Non-alloy steel, about 0.45 %C, annealed (190 HB) Optimal 80 8 4,240 rpm / 0.24 mm/rev 2,550 rpm / 0.37 mm/rev
Non-alloy steel, about 0.45 %C, quenched and tempered (250 HB) Optimal 60 7 3,180 rpm / 0.19 mm/rev 1,910 rpm / 0.3 mm/rev
Non-alloy steel, about 0.75 %C, annealed (270 HB) Optimal 60 7 3,180 rpm / 0.19 mm/rev 1,910 rpm / 0.3 mm/rev
Non-alloy steel, about 0.75 %C, quenched and tempered (300 HB) Optimal 50 6 2,650 rpm / 0.16 mm/rev 1,590 rpm / 0.24 mm/rev
Low-alloy and cast steel (under 5% alloying), annealed (180 HB) Optimal 60 7 3,180 rpm / 0.19 mm/rev 1,910 rpm / 0.3 mm/rev
Low-alloy steel, quenched and tempered (275 HB) Optimal 60 7 3,180 rpm / 0.19 mm/rev 1,910 rpm / 0.3 mm/rev
Low-alloy steel, quenched and tempered (300 HB) Optimal 50 6 2,650 rpm / 0.16 mm/rev 1,590 rpm / 0.24 mm/rev
High-alloy, cast and tool steel, annealed (200 HB) Optimal 50 6 2,650 rpm / 0.16 mm/rev 1,590 rpm / 0.24 mm/rev
Austenitic stainless steel, age hardened (180 HB) Effective 40 5 2,120 rpm / 0.12 mm/rev 1,270 rpm / 0.19 mm/rev
Duplex stainless steel (250 HB) Effective 30 4 1,590 rpm / 0.1 mm/rev 955 rpm / 0.16 mm/rev
Grey cast iron, ferritic / pearlitic (180 HB) Optimal 80 8 4,240 rpm / 0.24 mm/rev 2,550 rpm / 0.37 mm/rev
Grey cast iron, pearlitic (260 HB) Effective 70 8 3,710 rpm / 0.24 mm/rev 2,230 rpm / 0.37 mm/rev
Nodular cast iron, ferritic (160 HB) Optimal 60 7 3,180 rpm / 0.19 mm/rev 1,910 rpm / 0.3 mm/rev
Nodular cast iron, pearlitic (250 HB) Effective 60 7 3,180 rpm / 0.19 mm/rev 1,910 rpm / 0.3 mm/rev
Malleable cast iron, ferritic (130 HB) Effective 60 7 3,180 rpm / 0.19 mm/rev 1,910 rpm / 0.3 mm/rev
Malleable cast iron, pearlitic (230 HB) Effective 60 7 3,180 rpm / 0.19 mm/rev 1,910 rpm / 0.3 mm/rev
Chilled cast iron (400 HB) Effective 70 8 3,710 rpm / 0.24 mm/rev 2,230 rpm / 0.37 mm/rev

Feed rates (mm/rev) for the feed numbers above, by drill diameter:

Ø (mm) Feed no. 4 (mm/rev) Feed no. 5 (mm/rev) Feed no. 6 (mm/rev) Feed no. 7 (mm/rev) Feed no. 8 (mm/rev)
2 0.04 0.05 0.06 0.075 0.095
3 0.055 0.07 0.09 0.11 0.135
4 0.075 0.09 0.115 0.14 0.18
5 0.09 0.11 0.135 0.17 0.21
6 0.1 0.125 0.16 0.19 0.24
8 0.13 0.16 0.2 0.25 0.31
10 0.16 0.19 0.24 0.3 0.37
12 0.18 0.23 0.28 0.34 0.42

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 optimal positional accuracy and hole size, the use of spot drills is recommended prior to drilling the desired hole; see Sutton's spotting drill range (D175).
  • 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 drill diameter (d1) tolerance is m7 and the shank diameter (d2) tolerance is h6.

Key specifications

Specification Detail
Catalogue code D371 (12xD solid carbide drill, internal coolant)
Type Solid carbide drill bit, IK internal coolant
Material Solid carbide (VHM)
Finish AlCrN (aluminium chromium nitride) tip coating
Flute geometry R30: 30° right-hand helix
Point 135° Form C
Shank HA, DIN 6535 plain cylindrical
Drill diameter tolerance (d1) m7
Shank tolerance (d2) h6
Drilling depth up to 12 × Ø
Suitable for materials up to 1200 N/mm²
Sizes in this range 83 sizes, 3 to 12 mm

Related drilling products

Compare other Sutton solid carbide drills: D335 8xD, D332 5xD through-coolant and D329 3xD through-coolant. Browse all carbide drill bits. Need help choosing? Our drilling guides cover drill types and materials.
Product Highlights −

The Sutton D371 is a 12xD solid carbide (VHM) drill with internal coolant supply, a 30° right-hand helix (R30) and a 135° Form C point. It carries an AlCrN tip coating, has an HA shank to DIN 6535 and is for materials up to 1200 N/mm². This range has 83 sizes from 3 to 12 mm.

The strong core and the micro geometry and surface conditioning are designed for optimal chip control, and the internal coolant supply carries coolant to the cutting edges through the drill. The AlCrN tip finish is designed for maximum tool life. The drill diameter (d1) tolerance is m7 and the shank diameter (d2) tolerance is h6. At 12xD this is the long-reach drill in the carbide internal-coolant family, for deeper holes than the 3xD to 8xD drills.

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