HSS DIN 338 SMART STEP twist drill bit
Twist drill HSS DIN 338 SMART STEP
DRL-TWST-MET-DIN338-HSS-SMARTSTEP-D2,5MM
ZEBRA SMART STEP
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The original SMART STEP: the first twist drill bit with stepped drill bit tip geometry (from dia. 2.5 mm)
Precise, circular drilling
Extremely comfortable drilling
- Saves pre-drilling, precise tapping without running off centre
- Angled drilling possible
- Simple boring or enlarging of an existing drill hole
Significantly faster than conventional twist drill bits with point thinning
Ideal for drilling out rivets and stud bolts
The first twist drill bit to enable precise, hand-guided drilling up to dia. 20 mm without pre-drilling, and when used on a box column drill, even allows precise drilling up to dia. 26.5 mm without pre-drilling
From drill diameter > 13.0 mm, shank reduced to dia. 12.7 mm for use in all common 3-jaw drill chucks
3-flat shank (from dia. 4 mm)
- No spinning in the drill chuck: faster, more comfortable working
- Optimal power transmission
- Protects the drill chuck from damage
- Little effort required to loosen and tighten the drill chuck
Product packaging made of 100 % PCR (recycled plastic from household waste), 100 % recyclable and Cradle to Cradle Certified® Bronze
For blind bores, please note the extended drill tip (see dimension l3)!
Datasheets(X)
- Perfect for rivet holes, drilling out stud bolts, for drilling sheet metal and thin-walled profile materials (e.g. aluminium/window profiles).
- High quality of drill holes and significantly longer service life compared to conventional twist wood drill bits for drilling holes in wood.
- Ideal for high-precision, comfortable and quick work in solid materials (e.g. in steel with strength of up to 1000 N/mm², aluminium and plastics).
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Suitable for machine type | Drill |
Material to be processed | Steel |
Quality | ZEBRA-Premium |
Standard / drilling depth | DIN 338 / 5xD |
Diameter (Ø) | 2.5 mm |
Length (l1) | 57 mm |
Chip flute length (l2) | 30 mm |
Drill tip length (l3) | 1.6 mm |
Shank diameter | 2.5 mm |
Shank style | Cylindrical |
Surface | Multiple refined |
Cutting material | HSS |
Type | SMART STEP |
Service life (points system) | 3 of 4 points |
Drilling speed (point system) | 4 of 4 points |
Bore hole quality (point system) ( ) | 4 of 4 points |
Versatility (points system) | 3 of 4 points |
Drilling behaviour (point system) | 4 of 4 points |
Suitable for drill (points system) | 4 of 4 points |
Suitable for cordless drills (points system) | 4 of 4 points |
Suitable for upright drilling machine (points system) | 4 of 4 points |
Self-centring | Yes |
Suitable for tensile strength up to | 1000 N/mm² |
Material of sub-group | General structural steels |
Cutting values | ||||||||||||
For dia. 1.0-2.5 | ||||||||||||
Material designation | Tensile strength | From dia. 1.0 | From dia. 2.0 | From dia. 2.5 | ||||||||
vc | n | f | n | f | n | f | ||||||
from | to | from | to | from | to | from | to | |||||
Steels | ||||||||||||
General structural steels | ≤ 850 N/mm² | 25 | 37 | 7,958 | 9,549 | 0,016 | 3,979 | 4,775 | 0,050 | 3,183 | 3,820 | 0,063 |
Unalloyed heat-treated steels | ≤ 850 N/mm² | 25 | 37 | 7,958 | 9,549 | 0,016 | 3,979 | 4,775 | 0,050 | 3,183 | 3,820 | 0,063 |
Low-alloy heat-treated steels | ≤ 850 N/mm² | 25 | 37 | 7,958 | 9,549 | 0,016 | 3,979 | 4,775 | 0,050 | 3,183 | 3,820 | 0,063 |
Unalloyed heat-treated steels | ≤ 1,000 N/mm² | 22 | 31 | 7,003 | 7,958 | 0,014 | 3,501 | 3,979 | 0,040 | 2,801 | 3,183 | 0,050 |
Low-alloy heat-treated steels | ≤ 1,000 N/mm² | 22 | 31 | 7,003 | 7,958 | 0,014 | 3,501 | 3,979 | 0,040 | 2,801 | 3,183 | 0,050 |
Alloyed heat-treated steels | ≤ 1,000 N/mm² | 10 | 20 | 3,183 | 5,093 | 0,012 | 1,592 | 2,546 | 0,032 | 1,273 | 2,037 | 0,040 |
Nitriding steels | ≤ 1,000 N/mm² | 10 | 20 | 3,183 | 5,093 | 0,012 | 1,592 | 2,546 | 0,032 | 1,273 | 2,037 | 0,040 |
Tool steels | ≤ 1,000 N/mm² | 10 | 20 | 3,183 | 5,093 | 0,012 | 1,592 | 2,546 | 0,032 | 1,273 | 2,037 | 0,040 |
High-speed steels | ≤ 1,000 N/mm² | 10 | 20 | 3,183 | 5,093 | 0,012 | 1,592 | 2,546 | 0,032 | 1,273 | 2,037 | 0,040 |
Cast metals | ||||||||||||
Cast iron | ≤ 350 HB | 22 | 31 | 8,913 | 10,186 | 0,018 | 4,456 | 5,093 | 0,063 | 3,565 | 4,074 | 0,080 |
Spheroidal graphite and malleable iron | ≤ 350 HB | 22 | 31 | 7,003 | 7,958 | 0,018 | 3,501 | 3,979 | 0,063 | 2,801 | 3,183 | 0,080 |
Non-ferrous metal | ||||||||||||
Aluminium | ≤ 600 N/mm² | 40 | 60 | 12,732 | 19,099 | 0,018 | 6,366 | 9,549 | 0,063 | 5,093 | 7,639 | 0,080 |
Plastics | ||||||||||||
Plastics, thermosetting | 20 | 37 | 6,366 | 9,549 | 0,016 | 3,183 | 4,775 | 0,050 | 2,546 | 3,820 | 0,063 | |
Plastics, thermoplastic | 20 | 37 | 4,777 | 9,549 | 0,016 | 3,183 | 4,775 | 0,050 | 2,546 | 3,820 | 0,063 | |
Wood | ||||||||||||
Softwood | 25 | 37 | 7,958 | 9,549 | 0,016 | 3,979 | 4,775 | 0,050 | 3,183 | 3,820 | 0,063 | |
Hardwood | ||||||||||||
Hardwood | 22 | 31 | 7,003 | 7,958 | 0,014 | 3,501 | 3,979 | 0,040 | 2,801 | 3,183 | 0,050 |
Cutting values | ||||||||||||
For dia. 3.15-5.0 | ||||||||||||
Material designation | Tensile strength | From dia. 3.15 | From dia. 4.0 | From dia. 5.0 | ||||||||
vc | n | f | n | f | n | f | ||||||
from | to | from | to | from | to | from | to | |||||
Steels | ||||||||||||
General structural steels | ≤ 850 N/mm² | 25 | 37 | 2,526 | 3,032 | 0,080 | 1,989 | 2,387 | 0,100 | 1,831 | 2,197 | 0,115 |
Unalloyed heat-treated steels | ≤ 850 N/mm² | 25 | 37 | 2,526 | 3,032 | 0,080 | 1,989 | 2,387 | 0,100 | 1,831 | 2,197 | 0,115 |
Low-alloy heat-treated steels | ≤ 850 N/mm² | 25 | 37 | 2,526 | 3,032 | 0,080 | 1,989 | 2,387 | 0,100 | 1,831 | 2,197 | 0,115 |
Unalloyed heat-treated steels | ≤ 1,000 N/mm² | 22 | 31 | 2,223 | 2,526 | 0,063 | 1,751 | 1,989 | 0,080 | 1,611 | 1,831 | 0,092 |
Low-alloy heat-treated steels | ≤ 1,000 N/mm² | 22 | 31 | 2,223 | 2,526 | 0,063 | 1,751 | 1,989 | 0,080 | 1,611 | 1,831 | 0,092 |
Alloyed heat-treated steels | ≤ 1,000 N/mm² | 10 | 20 | 1,011 | 1,617 | 0,050 | 796 | 1,273 | 0,063 | 733 | 1,172 | 0,072 |
Nitriding steels | ≤ 1,000 N/mm² | 10 | 20 | 1,011 | 1,617 | 0,050 | 796 | 1,273 | 0,063 | 733 | 1,172 | 0,072 |
Tool steels | ≤ 1,000 N/mm² | 10 | 20 | 1,011 | 1,617 | 0,050 | 796 | 1,273 | 0,063 | 733 | 1,172 | 0,072 |
High-speed steels | ≤ 1,000 N/mm² | 10 | 20 | 1,011 | 1,617 | 0,050 | 796 | 1,273 | 0,063 | 733 | 1,172 | 0,072 |
Cast metals | ||||||||||||
Cast iron | ≤ 350 HB | 22 | 31 | 2,829 | 3,234 | 0,100 | 2,228 | 2,546 | 0,125 | 2,050 | 2,343 | 0,144 |
Spheroidal graphite and malleable iron | ≤ 350 HB | 22 | 31 | 2,223 | 2,526 | 0,100 | 1,751 | 1,989 | 0,125 | 1,611 | 1,831 | 0,144 |
Non-ferrous metal | ||||||||||||
Aluminium | ≤ 600 N/mm² | 40 | 60 | 4,042 | 6,063 | 0,100 | 3,183 | 4,775 | 0,125 | 2,546 | 3,820 | 0,125 |
Plastics | ||||||||||||
Plastics, thermosetting | 20 | 37 | 2,021 | 3,032 | 0,080 | 1,592 | 2,387 | 0,100 | 1,464 | 2,197 | 0,115 | |
Plastics, thermoplastic | 20 | 37 | 2,021 | 3,032 | 0,080 | 1,592 | 2,387 | 0,100 | 1,464 | 2,197 | 0,115 | |
Wood | ||||||||||||
Softwood | 25 | 37 | 2,526 | 3,032 | 0,080 | 1,989 | 2,387 | 0,100 | 1,831 | 2,197 | 0,115 | |
Hardwood | ||||||||||||
Hardwood | 22 | 31 | 2,223 | 2,526 | 0,063 | 1,751 | 1,989 | 0,080 | 1,611 | 1,831 | 0,092 |
Cutting values | ||||||||||||
For dia. 6.3-10.0 | ||||||||||||
Material designation | Tensile strength | From dia. 6.3 | From dia. 8.0 | From dia. 10.0 | ||||||||
vc | n | f | n | f | n | f | ||||||
from | to | from | to | from | to | from | to | |||||
Steels | ||||||||||||
General structural steels | ≤ 850 N/mm² | 25 | 37 | 1,642 | 1,971 | 0,163 | 1,294 | 1,552 | 0,208 | 1,035 | 1,242 | 0,260 |
Unalloyed heat-treated steels | ≤ 850 N/mm² | 25 | 37 | 1,642 | 1,971 | 0,163 | 1,294 | 1,552 | 0,208 | 1,035 | 1,242 | 0,260 |
Low-alloy heat-treated steels | ≤ 850 N/mm² | 25 | 37 | 1,642 | 1,971 | 0,163 | 1,294 | 1,552 | 0,208 | 1,035 | 1,242 | 0,260 |
Unalloyed heat-treated steels | ≤ 1,000 N/mm² | 22 | 31 | 1,446 | 1,642 | 0,130 | 1,138 | 1,294 | 0,163 | 910 | 1,035 | 0,208 |
Low-alloy heat-treated steels | ≤ 1,000 N/mm² | 22 | 31 | 1,446 | 1,642 | 0,130 | 1,138 | 1,294 | 0,163 | 910 | 1,035 | 0,208 |
Alloyed heat-treated steels | ≤ 1,000 N/mm² | 10 | 20 | 657 | 1,050 | 0,104 | 517 | 828 | 0,130 | 413 | 662 | 0,163 |
Nitriding steels | ≤ 1,000 N/mm² | 10 | 20 | 657 | 1,050 | 0,104 | 517 | 828 | 0,130 | 413 | 662 | 0,163 |
Tool steels | ≤ 1,000 N/mm² | 10 | 20 | 657 | 1,050 | 0,104 | 517 | 828 | 0,130 | 413 | 662 | 0,163 |
High-speed steels | ≤ 1,000 N/mm² | 10 | 20 | 657 | 1,050 | 0,104 | 517 | 828 | 0,130 | 413 | 662 | 0,163 |
Cast metals | ||||||||||||
Cast iron | ≤ 350 HB | 22 | 31 | 1,840 | 2,102 | 0,208 | 1,448 | 1,655 | 0,260 | 1,158 | 1,325 | 0,325 |
Spheroidal graphite and malleable iron | ≤ 350 HB | 22 | 31 | 1,446 | 1,642 | 0,208 | 1,138 | 1,294 | 0,260 | 910 | 1,035 | 0,325 |
Non-ferrous metal | ||||||||||||
Aluminium | ≤ 600 N/mm² | 40 | 60 | 2,021 | 3,032 | 0,160 | 1,592 | 2,387 | 0,200 | 1,273 | 1,910 | 0,250 |
Plastics | ||||||||||||
Plastics, thermosetting | 20 | 37 | 1,314 | 1,971 | 0,163 | 1,035 | 1,552 | 0,208 | 828 | 1,242 | 0,260 | |
Plastics, thermoplastic | 20 | 37 | 1,314 | 1,971 | 0,163 | 1,035 | 1,552 | 0,208 | 828 | 1,242 | 0,260 | |
Wood | ||||||||||||
Softwood | 25 | 37 | 1,642 | 1,971 | 0,163 | 1,294 | 1,552 | 0,208 | 1,035 | 1,242 | 0,260 | |
Hardwood | ||||||||||||
Hardwood | 22 | 31 | 1,446 | 1,642 | 0,130 | 1,138 | 1,294 | 0,163 | 910 | 1,035 | 0,208 |
Cutting values | ||||||
For dia. 12.5 | ||||||
Material designation | Tensile strength | From dia. 12.5 | ||||
vc | n | f | ||||
from | to | from | to | |||
Steels | ||||||
General structural steels | ≤ 850 N/mm² | 25 | 37 | 796 | 955 | 0,250 |
Unalloyed heat-treated steels | ≤ 850 N/mm² | 25 | 37 | 796 | 955 | 0,250 |
Low-alloy heat-treated steels | ≤ 850 N/mm² | 25 | 37 | 796 | 955 | 0,250 |
Unalloyed heat-treated steels | ≤ 1,000 N/mm² | 22 | 31 | 700 | 796 | 0,200 |
Low-alloy heat-treated steels | ≤ 1,000 N/mm² | 22 | 31 | 700 | 796 | 0,200 |
Alloyed heat-treated steels | ≤ 1,000 N/mm² | 10 | 20 | 319 | 509 | 0,156 |
Nitriding steels | ≤ 1,000 N/mm² | 10 | 20 | 319 | 509 | 0,156 |
Tool steels | ≤ 1,000 N/mm² | 10 | 20 | 319 | 509 | 0,156 |
High-speed steels | ≤ 1,000 N/mm² | 10 | 20 | 319 | 509 | 0,156 |
Cast metals | ||||||
Cast iron | ≤ 350 HB | 22 | 31 | 891 | 1,019 | 0,313 |
Spheroidal graphite and malleable iron | ≤ 350 HB | 22 | 31 | 700 | 796 | 0,313 |
Non-ferrous metal | ||||||
Aluminium | ≤ 600 N/mm² | 40 | 60 | 1,019 | 1,528 | 0,250 |
Plastics | ||||||
Plastics, thermosetting | 20 | 37 | 636 | 955 | 0,250 | |
Plastics, thermoplastic | 20 | 37 | 636 | 955 | 0,250 | |
Wood | ||||||
Softwood | 25 | 37 | 796 | 955 | 0,250 | |
Hardwood | ||||||
Hardwood | 22 | 31 | 700 | 796 | 0,200 |
Legend |
vc = cutting speed [m/min] |
f = feed (mm/r) |
n = rotation speed [rpm] |
The suggested cutting values are reference values and must be adapted to the respective conditions. |
Select RAL-colour code
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