Sutton 0.5mm D153 Black Magic Stub Drill Bit - Metric - Cobalt TiAlN

The Sutton D153 is a Black Magic R40 VA stub drill (designation VA) made from 5% cobalt high speed steel (HSS-Co) with a TiAlN coating. It has 40° right-hand helix flutes (R40), a 4 facet point (140° up to 1.95 mm, 130° from 2.0 to 4.0 mm and 120° from 4.1 mm) and an endmill shank, d2 to h7, and is made to DIN 1897.

Black Magic is a high performance drill for austenitic stainless steels and most long chipping materials. The optimised geometry is designed to avoid work hardening and give high productivity, the endmill shank gives greater accuracy, and the TiAlN coating is for longer tool life.

This range has 180 sizes from 0.5 to 20 mm, with flute lengths of 3 to 66 mm and overall lengths of 38 to 131 mm. Further sizes in the Sutton size table are available on request as special manufacture, subject to lead time, and 0.01 mm steps up to 6.0 mm can also be made to order. The size table shows the inch equivalent where a size matches a fractional inch.

Where this product is used

• Shallow, rigid drilling on CNC machines and drill presses, where the short stub length keeps the drill stiff.
• Austenitic stainless steels and most long chipping materials, where the optimised geometry is designed to avoid work hardening.
• Materials rated Optimal for this drill: austenitic stainless steel; duplex stainless steel; precipitation-hardening stainless steel; wrought aluminium and magnesium alloys; cast aluminium and magnesium alloys (up to 12% Si); and free-cutting copper alloys, bronze.
• Also rated Effective: annealed low-alloy steel, low-alloy steel, quenched and tempered (275 HB); thermosetting and fibre-reinforced plastics; and titanium alpha alloys, annealed titanium alpha / beta alloys, annealed titanium beta alloys.
• Rated Optimal for some grades and Effective for others: non-alloy steels; and ferritic and martensitic stainless steels.
• Hole depths up to 3 × Ø. Step feeding or pecking is required beyond 3 × Ø.

Finish

Titanium aluminium nitride (TiAlN) has a microhardness of 3300 HV and is stable to about 900 °C (1652 °F). It is used on abrasive and difficult-to-machine materials such as stainless steel, at higher speeds and feeds, and with reduced or no coolant.

Cutting speeds and feeds

Cutting speeds (Vc) and feed numbers for this drill come from the Sutton High Performance catalogue application guide, which lists 21 material groups for this drill. The guide prints Optimal ratings in bold and Effective ratings in regular type, and the table below 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.

Feed rates (mm/rev) for the feed numbers above:

Sizes and item numbers

Every size in the range, with its Sutton item number, flute length (l2) and overall length (l1).

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, use a spot drill before drilling the hole; the Sutton D175 and D176 spotting drills are made for this.
• 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 size table gives the drill diameter (d1) tolerance as h8 and the shank tolerance as h7. An h8 drill diameter may be at nominal or smaller, never larger.

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

Related drilling products

Compare other Sutton drills: D151 CNC stub, D155 R40 UNI SPM stub and D177 DXS stub. Browse all Stub 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.