Sutton 7.8mm D368 5xD Carbide Jobber Drill Bit - VHM
Available
The Sutton D368 is a 5 × Ø solid carbide jobber drill (listed as Tecline in the Sutton index) with a bright (uncoated) finish. It has 25° right-hand helix flutes (R25), a 118° Form C point and a straight shank. It is made to DIN 338.
Suitable for steels and abrasive applications; designed to allow high feed rates with good chip flow; four facet point ensures accurate holes.
This is the metric range: 87 sizes from 1 to 12.7 mm, with flute lengths of 13 to 101 mm and overall lengths of 34 to 151 mm.
Where this product is used
- Steels and abrasive applications at high feed rates with good chip flow, the use this drill is made for.
- Materials rated Optimal for this drill: wrought aluminium and magnesium alloys; cast aluminium and magnesium alloys (up to 12% Si); and aluminium and magnesium cast alloys over 12% Si.
- Also rated Effective: low-alloy steels; nodular cast iron; and thermosetting and fibre-reinforced plastics.
- Rated Optimal for some grades and Effective for others: non-alloy steels; and grey cast iron.
- Hole depths to 5 × 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 0.15 %C, annealed (125 HB) | Optimal | 55 | 6 | 2,920 rpm / 0.16 mm/rev | 1,750 rpm / 0.24 mm/rev |
| Non-alloy steel, about 0.45 %C, annealed (190 HB) | Optimal | 55 | 6 | 2,920 rpm / 0.16 mm/rev | 1,750 rpm / 0.24 mm/rev |
| Non-alloy steel, about 0.45 %C, quenched and tempered (250 HB) | Effective | 50 | 6 | 2,650 rpm / 0.16 mm/rev | 1,590 rpm / 0.24 mm/rev |
| Non-alloy steel, about 0.75 %C, annealed (270 HB) | Effective | 50 | 6 | 2,650 rpm / 0.16 mm/rev | 1,590 rpm / 0.24 mm/rev |
| Non-alloy steel, about 0.75 %C, quenched and tempered (300 HB) | Effective | 40 | 6 | 2,120 rpm / 0.16 mm/rev | 1,270 rpm / 0.24 mm/rev |
| Low-alloy and cast steel (under 5% alloying), annealed (180 HB) | Effective | 55 | 6 | 2,920 rpm / 0.16 mm/rev | 1,750 rpm / 0.24 mm/rev |
| Low-alloy steel, quenched and tempered (275 HB) | Effective | 50 | 6 | 2,650 rpm / 0.16 mm/rev | 1,590 rpm / 0.24 mm/rev |
| Low-alloy steel, quenched and tempered (300 HB) | Effective | 40 | 6 | 2,120 rpm / 0.16 mm/rev | 1,270 rpm / 0.24 mm/rev |
| Grey cast iron, ferritic / pearlitic (180 HB) | Optimal | 85 | 3 | 4,510 rpm / 0.08 mm/rev | 2,710 rpm / 0.12 mm/rev |
| Grey cast iron, pearlitic (260 HB) | Effective | 55 | 3 | 2,920 rpm / 0.08 mm/rev | 1,750 rpm / 0.12 mm/rev |
| Nodular cast iron, ferritic (160 HB) | Effective | 85 | 3 | 4,510 rpm / 0.08 mm/rev | 2,710 rpm / 0.12 mm/rev |
| Nodular cast iron, pearlitic (250 HB) | Effective | 55 | 3 | 2,920 rpm / 0.08 mm/rev | 1,750 rpm / 0.12 mm/rev |
| Wrought aluminium and magnesium alloy, non heat treatable (60 HB) | Optimal | 100 | 4 | 5,310 rpm / 0.1 mm/rev | 3,180 rpm / 0.16 mm/rev |
| Wrought aluminium and magnesium alloy, heat treatable (100 HB) | Optimal | 100 | 4 | 5,310 rpm / 0.1 mm/rev | 3,180 rpm / 0.16 mm/rev |
| Cast aluminium and magnesium alloy (up to 12% Si), non heat treatable (75 HB) | Optimal | 100 | 4 | 5,310 rpm / 0.1 mm/rev | 3,180 rpm / 0.16 mm/rev |
| Cast aluminium and magnesium alloy (up to 12% Si), heat treatable (90 HB) | Optimal | 80 | 4 | 4,240 rpm / 0.1 mm/rev | 2,550 rpm / 0.16 mm/rev |
| Aluminium and magnesium cast alloy over 12% Si (130 HB) | Optimal | 80 | 4 | 4,240 rpm / 0.1 mm/rev | 2,550 rpm / 0.16 mm/rev |
| Thermosetting and fibre-reinforced plastics | Effective | 120 | 3 | 6,370 rpm / 0.08 mm/rev | 3,820 rpm / 0.12 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. 6 (mm/rev) |
|---|---|---|---|
| 2 | 0.03 | 0.04 | 0.06 |
| 3 | 0.045 | 0.055 | 0.09 |
| 4 | 0.06 | 0.075 | 0.12 |
| 5 | 0.07 | 0.09 | 0.14 |
| 6 | 0.08 | 0.1 | 0.16 |
| 8 | 0.1 | 0.13 | 0.2 |
| 10 | 0.12 | 0.16 | 0.24 |
| 12 | 0.15 | 0.18 | 0.28 |
| 16 | 0.19 | 0.23 | 0.36 |
| 20 | 0.23 | 0.28 | 0.42 |
| 25 | 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.
Key specifications
| Specification | Detail |
|---|---|
| Catalogue code | D368 |
| Range | 5xD Carbide Jobber Drill |
| Material | Solid carbide (VHM) |
| Finish | Bright (uncoated) |
| Flute geometry | 25° right-hand helix (R25) |
| Point | 118° Form C |
| Shank | Straight shank |
| Standard | DIN 338 |
| Drill diameter tolerance (d1) | m7 |
| Designation | N |
| Drilling depth | up to 5 × Ø |
| Sizes in this range | 87 sizes, 1-12.7mm |
Related drilling products
Compare other Sutton drills: D326 5xD carbide, D323 3xD carbide, D304 3xD carbide and D310 3xD carbide (metric). 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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Sutton D368 R25 Carbide Jobber Drill Bits - DIN338 - VHM: 7.8
SKU: A0102429 | Model: D3680780
This is the 7.8mm diameter option of the Sutton D368 R25 Carbide Jobber Drill Bits - DIN338 - VHM. Key details for this option: flute length 75mm, overall length 117mm.
