HSS recommended rpm per drill and material type
Recommended RPM per drill diameter and material type
Drill Diameter
Free-Cut Stainless
Grey Cast Iron
Mild Steel
Aluminium Copper
Brass
2
3501 2801 2334 2122 2000 1750 1550 1500 1400 1273 1167 1077 1000
2228 1783 1485 1350 1273 1114
5252 4202 3501 3183 3001 2626 2401 2200 2101 1910 1751 1616 1501 1313 1167 1050
6366 5093 4244 3845 3638 3183 2829 2620 2546 2315 2122 1959 1819 1592 1415 1273 1107
6366 4093 4244 3858 3638 3183 2829 2650 2546 2315 2122 1959 1819 1592 1415 1273 1107
6366 5093 4244 4010 3858 3183 2829 2625 2546 2315 2122 1959 1819 1592 1415 1273 1061
2.5
3
3.2 3.5
4
4.5 4.8
990 925 891 810 743 686 637 557 495 446 371
5
5.5
6
6.5
7 8 9
875 778 700 584
10 12
875
LUBRICATION WHEN USING DRILLS
SHARPENING DRILL BITS
•
It is recommended that lubrication is used as the drilling process produces friction between the drill bit and the material being drilled, this causes wear on the drill bit. When lubrication is used it will extend the life of the drill, and help to maintain the sharp edge and reduce the risk of breakage.
•
It is possible to sharpen drill bits - care should be taken in ensuring the correct cutting angles are maintained during the re sharpening process.
•
WANT TO KNOW MORE? Scan the QR Code to access more information and images.
Drill Bits Flyer. Feb 2023. Information is subject to change without notice. Images are for illustration purposes only. The L.S. Starrett Company Ltd. Oxnam
Road, Jedburgh, TD8 6LR T: +44 (0)1835 863501 E: sales@starrett.co.uk
www.starrett.co.uk
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