Sutton 8.5mm D304 3xD Carbide Drill Bit - Metric - VHM
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The Sutton D304 is a 3 × Ø solid carbide drill with a bright (uncoated) finish. It has 15° right-hand helix flutes (R15), a 135° 4 facet Form C point and a plain cylindrical shank.
Rigid twist drill with slow spiral 15 degree flutes; suitable for harder steel, tool steel and cast iron.
This is the metric range: 26 sizes from 1 to 12 mm, with flute lengths of 13 to 54 mm and overall lengths of 38 to 92 mm.
Where this product is used
- Harder steel, tool steel and cast iron, the materials this rigid slow-spiral carbide drill is made for.
- Materials rated Optimal for this drill: non-alloy steels; low-alloy steels; high-alloy and tool steels; ferritic and martensitic stainless steels; precipitation-hardening stainless steel; grey cast iron; nodular cast iron; malleable cast iron; aluminium and magnesium cast alloys over 12% Si; and chilled and hardened cast iron.
- Also rated Effective: duplex stainless steel; wrought aluminium and magnesium alloys; cast aluminium and magnesium alloys (up to 12% Si); and thermosetting and fibre-reinforced plastics.
- Rated Optimal for some grades and Effective for others: copper alloys, brass and bronze; and hardened steel (45 to 62 HRC).
- Hole depths to 3 × Ø. Step feeding or pecking is required beyond 3 × Ø.
Finish
Bright (uncoated). The bright finish is for general-purpose applications.
Cutting speeds and feeds
Cutting speeds (Vc) and feed numbers for this drill are from the Sutton High Performance catalogue application guide. The table lists the material groups covered. Optimal ratings are shown in bold and Effective ratings in regular type. 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 0.45 %C, quenched and tempered (250 HB) | Optimal | 80 | 4 | 4,240 rpm / 0.1 mm/rev | 2,550 rpm / 0.16 mm/rev |
| Non-alloy steel, about 0.75 %C, annealed (270 HB) | Optimal | 80 | 4 | 4,240 rpm / 0.1 mm/rev | 2,550 rpm / 0.16 mm/rev |
| Non-alloy steel, about 0.75 %C, quenched and tempered (300 HB) | Optimal | 55 | 3 | 2,920 rpm / 0.08 mm/rev | 1,750 rpm / 0.12 mm/rev |
| Low-alloy steel, quenched and tempered (275 HB) | Optimal | 70 | 3 | 3,710 rpm / 0.08 mm/rev | 2,230 rpm / 0.12 mm/rev |
| Low-alloy steel, quenched and tempered (300 HB) | Optimal | 55 | 3 | 2,920 rpm / 0.08 mm/rev | 1,750 rpm / 0.12 mm/rev |
| Low-alloy steel, quenched and tempered (350 HB) | Optimal | 40 | 3 | 2,120 rpm / 0.08 mm/rev | 1,270 rpm / 0.12 mm/rev |
| High-alloy, cast and tool steel, annealed (200 HB) | Optimal | 55 | 3 | 2,920 rpm / 0.08 mm/rev | 1,750 rpm / 0.12 mm/rev |
| High-alloy, cast and tool steel, hardened and tempered (325 HB) | Optimal | 40 | 3 | 2,120 rpm / 0.08 mm/rev | 1,270 rpm / 0.12 mm/rev |
| Corrosion-resistant steel, ferritic / martensitic, annealed (200 HB) | Optimal | 40 | 3 | 2,120 rpm / 0.08 mm/rev | 1,270 rpm / 0.12 mm/rev |
| Corrosion-resistant steel, martensitic, quenched and tempered (240 HB) | Optimal | 40 | 3 | 2,120 rpm / 0.08 mm/rev | 1,270 rpm / 0.12 mm/rev |
| Duplex stainless steel (250 HB) | Effective | 25 | 3 | 1,330 rpm / 0.08 mm/rev | 795 rpm / 0.12 mm/rev |
| Precipitation-hardening stainless steel (250 HB) | Optimal | 25 | 3 | 1,330 rpm / 0.08 mm/rev | 795 rpm / 0.12 mm/rev |
| Grey cast iron, ferritic / pearlitic (180 HB) | Optimal | 90 | 3 | 4,770 rpm / 0.08 mm/rev | 2,860 rpm / 0.12 mm/rev |
| Grey cast iron, pearlitic (260 HB) | Optimal | 80 | 3 | 4,240 rpm / 0.08 mm/rev | 2,550 rpm / 0.12 mm/rev |
| Nodular cast iron, ferritic (160 HB) | Optimal | 80 | 3 | 4,240 rpm / 0.08 mm/rev | 2,550 rpm / 0.12 mm/rev |
| Nodular cast iron, pearlitic (250 HB) | Optimal | 80 | 3 | 4,240 rpm / 0.08 mm/rev | 2,550 rpm / 0.12 mm/rev |
| Malleable cast iron, ferritic (130 HB) | Optimal | 80 | 3 | 4,240 rpm / 0.08 mm/rev | 2,550 rpm / 0.12 mm/rev |
| Malleable cast iron, pearlitic (230 HB) | Optimal | 80 | 3 | 4,240 rpm / 0.08 mm/rev | 2,550 rpm / 0.12 mm/rev |
| Wrought aluminium and magnesium alloy, non heat treatable (60 HB) | Effective | 100-160 | 4 | 5,310-8,490 rpm / 0.1 mm/rev | 3,180-5,090 rpm / 0.16 mm/rev |
| Wrought aluminium and magnesium alloy, heat treatable (100 HB) | Effective | 100-160 | 4 | 5,310-8,490 rpm / 0.1 mm/rev | 3,180-5,090 rpm / 0.16 mm/rev |
| Cast aluminium and magnesium alloy (up to 12% Si), non heat treatable (75 HB) | Effective | 100-160 | 4 | 5,310-8,490 rpm / 0.1 mm/rev | 3,180-5,090 rpm / 0.16 mm/rev |
| Cast aluminium and magnesium alloy (up to 12% Si), heat treatable (90 HB) | Effective | 100-160 | 4 | 5,310-8,490 rpm / 0.1 mm/rev | 3,180-5,090 rpm / 0.16 mm/rev |
| Aluminium and magnesium cast alloy over 12% Si (130 HB) | Optimal | 100-160 | 4 | 5,310-8,490 rpm / 0.1 mm/rev | 3,180-5,090 rpm / 0.16 mm/rev |
| Copper alloys, free cutting, Pb over 1% (110 HB) | Effective | 100-160 | 4 | 5,310-8,490 rpm / 0.1 mm/rev | 3,180-5,090 rpm / 0.16 mm/rev |
| Brass (CuZn, CuSnZn) (90 HB) | Optimal | 100-160 | 4 | 5,310-8,490 rpm / 0.1 mm/rev | 3,180-5,090 rpm / 0.16 mm/rev |
| Bronze (CuSn) (100 HB) | Effective | 100-160 | 4 | 5,310-8,490 rpm / 0.1 mm/rev | 3,180-5,090 rpm / 0.16 mm/rev |
| Thermosetting and fibre-reinforced plastics | Effective | 50-280 | 6 | 2,650-14,850 rpm / 0.16 mm/rev | 1,590-8,910 rpm / 0.24 mm/rev |
| Hardened steel, 45 HRC | Optimal | 40 | 2 | 2,120 rpm / 0.065 mm/rev | 1,270 rpm / 0.1 mm/rev |
| Hardened steel, 55 HRC | Effective | 30 | 2 | 1,590 rpm / 0.065 mm/rev | 955 rpm / 0.1 mm/rev |
| Chilled cast iron (400 HB) | Optimal | 80 | 3 | 4,240 rpm / 0.08 mm/rev | 2,550 rpm / 0.12 mm/rev |
Feed rates (mm/rev) for the feed numbers above:
| Ø (mm) | Feed no. 2 (mm/rev) | Feed no. 3 (mm/rev) | Feed no. 4 (mm/rev) | Feed no. 6 (mm/rev) |
|---|---|---|---|---|
| 2 | 0.025 | 0.03 | 0.04 | 0.06 |
| 3 | 0.035 | 0.045 | 0.055 | 0.09 |
| 4 | 0.045 | 0.06 | 0.075 | 0.12 |
| 5 | 0.055 | 0.07 | 0.09 | 0.14 |
| 6 | 0.065 | 0.08 | 0.1 | 0.16 |
| 8 | 0.085 | 0.1 | 0.13 | 0.2 |
| 10 | 0.1 | 0.12 | 0.16 | 0.24 |
| 12 | 0.12 | 0.15 | 0.18 | 0.28 |
| 16 | 0.15 | 0.19 | 0.23 | 0.36 |
| 20 | 0.18 | 0.23 | 0.28 | 0.42 |
| 25 | 0.22 | 0.27 | 0.33 | 0.5 |
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 tolerance is -0.025.
Key specifications
| Specification | Detail |
|---|---|
| Catalogue code | D304 |
| Range | 3xD Carbide Drill |
| Material | Solid carbide (VHM) |
| Finish | Bright (uncoated) |
| Flute geometry | 15° right-hand helix (R15) |
| Point | 135° 4 facet Form C |
| Shank | Plain cylindrical shank |
| Drill diameter tolerance (d1) | m7 |
| Shank tolerance | -0.025 |
| Designation | NH |
| Drilling depth | up to 3 × Ø |
| Sizes in this range | 26 sizes, 1-12mm |
Related drilling products
Compare other Sutton drills: D310 3xD carbide (metric), D323 3xD carbide, D326 5xD carbide and D368 5xD carbide jobber. Browse all Carbide Drill Bits. 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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