SMART STEP EU+ HSS twist drill bit DIN 338
Twist drill bit SMART STEP EU+ HSS DIN 338
DRL-TWST-MET-DIN338-HSS-SMARTSTEP-D7,5MM
ZEBRA SMART STEP
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Extremely unequal pitch (EU+)
- Up to 50 % longer service life
- Significantly more comfortable drilling with less vibration, even less effort required and perfect tool guidance (up to 60 % less torque)
- Up to 20 % lower energy consumption
- Up to 15 % faster drilling progress
Precise, circular holes in a wide range of materials including wood, plastic and acrylic, without tearing or splintering
Extremely comfortable drilling
- Precise spot drilling without running off-centre
- Simple drilling or enlarging of an existing drill hole
- Angled drilling possible
- No rattling or catching, even in thin-walled material
- Burr-free hole exit
Significantly faster drilling will less effort compared to conventional HSS twist drill bits
Ideal for drilling out rivets and stud bolts
The first twist drill bit to enable precise, hand-held drilling up to dia. 20 mm without pre-drilling; even enables precise holes up to dia. 26.5 mm without pre-drilling when used in a box column drill
- Shank reduced to dia. 12.7 mm from > 13.0 mm drill bit diameter for use in all standard 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
- Minimal effort required to loosen and tighten the drill chuck
Available exclusively from WÜRTH
Product packaging made from 100 % PCR (recycled plastic from household waste) and 100 % recyclable
- For blind holes, please note the extended drill tip (see dimension l3)!
- The steps of the innovative point geometry drill gradually to achieve the required diameter. To achieve this, the chip is broken into small individual chips by several main cutting edges, thus ensuring optimal chip removal. The result is highly precise, circular drilling.
- The use of several cutting edges at the same time enables very fast, comfortable working and a long service life.
Datasheets(X)
- Ideal for use in cordless drills as well as on hand-held, box column and pillar drills
- For use in steel up to 1,000 N/mm², cast iron, aluminium, copper, brass, bronze, hard and soft wood, plastic (e.g. acrylic glass, HPL, screen printing plates) and composite materials (e.g. plastic profiles with steel core)
- High drill hole quality and significantly longer service life compared to conventional twist wood drill bits.
- Perfect for rivet holes, drilling out stud bolts, drilling sheet metal and thin-walled profile materials (e.g. aluminium/window profiles) and for drilling on round and sloping surfaces, such as pipes.
- Ideal for high-precision, comfortable and fast working in solid materials (e.g. in steel with strength of up to 1,000 N/mm², aluminium and plastics).
- Ideal for large drill hole diameters
Suitable for machine type | Drill, Cordless screwdrivers, Pedestal drilling machine |
Material to be processed | Steel, Cast iron, Non-ferrous metal, Wood, Hardwood |
Quality | ZEBRA-Premium |
Standard / drilling depth | DIN 338 / 5xD |
Diameter (Ø) | 7.5 mm |
Length (l1) | 109 mm |
Chip flute length (l2) | 69 mm |
Drill tip length (l3) | 8.4 mm |
Shank style | 3-face shank |
Surface | Multiple refined |
Cutting material | HSS |
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, Non-alloyed tempering steels, Cast iron, Ductile iron, Malleable cast iron, Magnesium alloys, Copper, low-alloyed, Brass, short-chipping, Brass, long-chipping, Plastics, thermoset, Plastics, thermoplastic |
For dia. 16.0-20.0 | |||||||||||||||
Material designation | Tensile strength | from dia. 16.0 | from dia. 20.0 | ||||||||||||
≤ dia. 8 | > dia. 8 | ≤ dia. 10 | > dia. 10 | ||||||||||||
vc | n | f | n | f | n | f | n | f | |||||||
from | to | from | to | from | to | from | to | from | to | ||||||
General structural steels | ≤ 850 N/mm² | 18 | 27 | 716 | 1074 | 0,03 | 358 | 537 | 0,04 | 573 | 859 | 0,035 | 286 | 430 | 0,042 |
Unalloyed hardened steels | ≤ 850 N/mm² | 18 | 27 | 716 | 1074 | 0,03 | 358 | 537 | 0,04 | 573 | 859 | 0,035 | 286 | 430 | 0,042 |
Low-alloy hardened steels | ≤ 850 N/mm² | 18 | 27 | 716 | 1074 | 0,03 | 358 | 537 | 0,04 | 573 | 859 | 0,035 | 286 | 430 | 0,042 |
Unalloyed hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 597 | 915 | 0,028 | 298 | 457 | 0,038 | 477 | 732 | 0,031 | 238 | 366 | 0,04 |
Low-alloy hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 597 | 915 | 0,028 | 298 | 457 | 0,038 | 477 | 732 | 0,031 | 238 | 366 | 0,04 |
Alloyed hardened steels | ≤ 1,200 N/mm² | 10 | 15 | 398 | 597 | 0,028 | 199 | 298 | 0,038 | 318 | 477 | 0,031 | 159 | 238 | 0,04 |
Nitriding steels | ≤ 1,200 N/mm² | 10 | 15 | 398 | 597 | 0,028 | 199 | 298 | 0,038 | 318 | 477 | 0,031 | 159 | 238 | 0,04 |
Tool steels | ≤ 1,200 N/mm² | 10 | 15 | 398 | 597 | 0,028 | 199 | 298 | 0,038 | 318 | 477 | 0,031 | 159 | 238 | 0,04 |
High-speed steels | ≤ 1,200 N/mm² | 10 | 15 | 398 | 597 | 0,028 | 199 | 298 | 0,038 | 318 | 477 | 0,031 | 159 | 238 | 0,04 |
Cast iron | ≤ 350 HB | 15 | 23 | 597 | 915 | 0,028 | 298 | 457 | 0,038 | 477 | 732 | 0,031 | 238 | 366 | 0,04 |
Nodular graphite and malleable iron | ≤ 350 HB | 15 | 23 | 597 | 915 | 0,028 | 298 | 457 | 0,038 | 477 | 732 | 0,031 | 238 | 366 | 0,04 |
Aluminium | ≤ 600 N/mm² | 35 | 45 | 1393 | 1791 | 0,03 | 696 | 895 | 0,04 | 1114 | 1433 | 0,035 | 557 | 716 | 0,042 |
Thermosetting plastics | 15 | 23 | 597 | 915 | 0,03 | 298 | 457 | 0,04 | 477 | 732 | 0,035 | 238 | 366 | 0,042 | |
Thermoplastic plastics | 15 | 23 | 597 | 915 | 0,03 | 298 | 457 | 0,04 | 477 | 732 | 0,035 | 238 | 366 | 0,042 | |
Soft and light wood | 21 | 30 | 836 | 1194 | 0,033 | 418 | 597 | 0,044 | 668 | 955 | 0,038 | 334 | 477 | 0,046 | |
Compact and hard wood | 18 | 27 | 716 | 1074 | 0,032 | 358 | 537 | 0,041 | 573 | 859 | 0,036 | 286 | 430 | 0,043 |
For dia. 10.0-12.5 | |||||||||||||||
Material designation | Tensile strength | from dia. 10.0 | from dia. 12.5 | ||||||||||||
≤ dia. 6 | > dia. 6 | ≤ dia. 6.5 | > dia. 6.5 | ||||||||||||
vc | n | f | n | f | n | f | n | f | |||||||
from | to | from | to | from | to | from | to | from | to | ||||||
General structural steels | ≤ 850 N/mm² | 18 | 27 | 955 | 1433 | 0,027 | 573 | 859 | 0,035 | 881 | 1322 | 0,027 | 458 | 687 | 0,038 |
Unalloyed hardened steels | ≤ 850 N/mm² | 18 | 27 | 955 | 1433 | 0,027 | 573 | 859 | 0,035 | 881 | 1322 | 0,027 | 458 | 687 | 0,038 |
Low-alloy hardened steels | ≤ 850 N/mm² | 18 | 27 | 955 | 1433 | 0,027 | 573 | 859 | 0,035 | 881 | 1322 | 0,027 | 458 | 687 | 0,038 |
Unalloyed hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 796 | 1220 | 0,025 | 477 | 732 | 0,031 | 734 | 1126 | 0,025 | 382 | 585 | 0,035 |
Low-alloy hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 796 | 1220 | 0,025 | 477 | 732 | 0,031 | 734 | 1126 | 0,025 | 382 | 585 | 0,035 |
Alloyed hardened steels | ≤ 1,200 N/mm² | 10 | 15 | 530 | 796 | 0,025 | 318 | 477 | 0,031 | 489 | 734 | 0,025 | 254 | 382 | 0,035 |
Nitriding steels | ≤ 1,200 N/mm² | 10 | 15 | 530 | 796 | 0,025 | 318 | 477 | 0,031 | 489 | 734 | 0,025 | 254 | 382 | 0,035 |
Tool steels | ≤ 1,200 N/mm² | 10 | 15 | 530 | 796 | 0,025 | 318 | 477 | 0,031 | 489 | 734 | 0,025 | 254 | 382 | 0,035 |
High-speed steels | ≤ 1,200 N/mm² | 10 | 15 | 530 | 796 | 0,025 | 318 | 477 | 0,031 | 489 | 734 | 0,025 | 254 | 382 | 0,035 |
Cast iron | ≤ 350 HB | 15 | 23 | 796 | 1220 | 0,025 | 477 | 732 | 0,031 | 734 | 1126 | 0,025 | 382 | 585 | 0,035 |
Nodular graphite and malleable iron | ≤ 350 HB | 15 | 23 | 796 | 1220 | 0,025 | 477 | 732 | 0,031 | 734 | 1126 | 0,025 | 382 | 585 | 0,035 |
Aluminium | ≤ 600 N/mm² | 35 | 45 | 1857 | 2388 | 0,027 | 1114 | 1433 | 0,035 | 1714 | 2204 | 0,027 | 891 | 1146 | 0,038 |
Thermosetting plastics | 15 | 23 | 796 | 1220 | 0,027 | 477 | 732 | 0,035 | 734 | 1126 | 0,027 | 382 | 585 | 0,038 | |
Thermoplastic plastics | 15 | 23 | 796 | 1220 | 0,027 | 477 | 732 | 0,035 | 734 | 1126 | 0,027 | 382 | 585 | 0,038 | |
Soft and light wood | 21 | 30 | 1114 | 1592 | 0,03 | 668 | 955 | 0,038 | 1028 | 1469 | 0,03 | 535 | 764 | 0,041 | |
Compact and hard wood | 18 | 27 | 955 | 1433 | 0,03 | 573 | 859 | 0,036 | 881 | 1322 | 0,03 | 458 | 687 | 0,038 |
Key | |
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. |
For dia. 24.0-26.5 | |||||||||||||||
Material designation | Tensile strength | from dia. 24.0 | from dia. 26.5 | ||||||||||||
≤ dia. 12 | > dia. 12 | ≤ dia. 12 | > dia. 12 | ||||||||||||
vc | n | f | n | f | n | f | n | f | |||||||
from | to | from | to | from | to | from | to | from | to | ||||||
General structural steels | ≤ 850 N/mm² | 18 | 27 | 477 | 716 | 0,038 | 238 | 358 | 0,042 | 477 | 716 | 0,038 | 216 | 320 | 0,042 |
Unalloyed hardened steels | ≤ 850 N/mm² | 18 | 27 | 477 | 716 | 0,038 | 238 | 358 | 0,042 | 477 | 716 | 0,038 | 216 | 320 | 0,042 |
Low-alloy hardened steels | ≤ 850 N/mm² | 18 | 27 | 477 | 716 | 0,038 | 238 | 358 | 0,042 | 477 | 716 | 0,038 | 216 | 320 | 0,042 |
Unalloyed hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 398 | 610 | 0,035 | 199 | 305 | 0,04 | 398 | 610 | 0,035 | 180 | 276 | 0,04 |
Low-alloy hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 398 | 610 | 0,035 | 199 | 305 | 0,04 | 398 | 610 | 0,035 | 180 | 276 | 0,04 |
Alloyed hardened steels | ≤ 1,200 N/mm² | 10 | 15 | 265 | 398 | 0,035 | 132 | 199 | 0,04 | 265 | 398 | 0,035 | 120 | 180 | 0,04 |
Nitriding steels | ≤ 1,200 N/mm² | 10 | 15 | 265 | 398 | 0,035 | 132 | 199 | 0,04 | 265 | 398 | 0,035 | 120 | 180 | 0,04 |
Tool steels | ≤ 1,200 N/mm² | 10 | 15 | 265 | 398 | 0,035 | 132 | 199 | 0,04 | 265 | 398 | 0,035 | 120 | 180 | 0,04 |
High-speed steels | ≤ 1,200 N/mm² | 10 | 15 | 265 | 398 | 0,035 | 132 | 199 | 0,04 | 265 | 398 | 0,035 | 120 | 180 | 0,04 |
Cast iron | ≤ 350 HB | 15 | 23 | 398 | 610 | 0,035 | 199 | 305 | 0,04 | 398 | 610 | 0,035 | 180 | 276 | 0,04 |
Nodular graphite and malleable iron | ≤ 350 HB | 15 | 23 | 398 | 610 | 0,035 | 199 | 305 | 0,04 | 398 | 610 | 0,035 | 180 | 276 | 0,04 |
Aluminium | ≤ 600 N/mm² | 35 | 45 | 928 | 1194 | 0,038 | 464 | 597 | 0,042 | 928 | 1194 | 0,038 | 420 | 540 | 0,042 |
Thermosetting plastics | 15 | 23 | 398 | 610 | 0,038 | 199 | 305 | 0,042 | 398 | 610 | 0,038 | 180 | 276 | 0,042 | |
Thermoplastic plastics | 15 | 23 | 398 | 610 | 0,038 | 199 | 305 | 0,042 | 398 | 610 | 0,038 | 180 | 276 | 0,042 | |
Soft and light wood | 21 | 30 | 557 | 796 | 0,041 | 278 | 398 | 0,046 | 557 | 796 | 0,041 | 252 | 360 | 0,046 | |
Compact and hard wood | 18 | 27 | 477 | 716 | 0,038 | 238 | 358 | 0,043 | 477 | 716 | 0,038 | 216 | 320 | 0,043 |
Cutting values for SMART STEP EU+ HSS DIN 338 twist drill bit | ||||||||||||
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 | |||||
General structural steels | ≤ 850 N/mm² | 18 | 27 | 5732 | 8598 | 0,01 | 2866 | 4299 | 0,012 | 2292 | 3439 | 0,015 |
Unalloyed hardened steels | ≤ 850 N/mm² | 18 | 27 | 5732 | 8598 | 0,01 | 2866 | 4299 | 0,012 | 2292 | 3439 | 0,015 |
Low-alloy hardened steels | ≤ 850 N/mm² | 18 | 27 | 5732 | 8598 | 0,01 | 2866 | 4299 | 0,012 | 2292 | 3439 | 0,015 |
Unalloyed hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 4777 | 7324 | 0,008 | 2388 | 3662 | 0,01 | 1910 | 2929 | 0,012 |
Low-alloy hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 4777 | 7324 | 0,008 | 2388 | 3662 | 0,01 | 1910 | 2929 | 0,012 |
Alloyed hardened steels | ≤ 1,200 N/mm² | 10 | 15 | 3184 | 4777 | 0,008 | 1592 | 2388 | 0,01 | 1273 | 1910 | 0,012 |
Nitriding steels | ≤ 1,200 N/mm² | 10 | 15 | 3184 | 4777 | 0,008 | 1592 | 2388 | 0,01 | 1273 | 1910 | 0,012 |
Tool steels | ≤ 1,200 N/mm² | 10 | 15 | 3184 | 4777 | 0,008 | 1592 | 2388 | 0,01 | 1273 | 1910 | 0,012 |
High-speed steels | ≤ 1,200 N/mm² | 10 | 15 | 3184 | 4777 | 0,008 | 1592 | 2388 | 0,01 | 1273 | 1910 | 0,012 |
Cast iron | ≤ 350 HB | 15 | 23 | 4777 | 7324 | 0,008 | 2388 | 3662 | 0,01 | 1910 | 2929 | 0,012 |
Nodular graphite and malleable iron | ≤ 350 HB | 15 | 23 | 4777 | 7324 | 0,008 | 2388 | 3662 | 0,01 | 1910 | 2929 | 0,012 |
Aluminium | ≤ 600 N/mm² | 35 | 45 | 11146 | 14331 | 0,01 | 5573 | 7165 | 0,012 | 4458 | 5732 | 0,015 |
Thermosetting plastics | 15 | 23 | 4777 | 7324 | 0,01 | 2388 | 3662 | 0,012 | 1910 | 2929 | 0,015 | |
Thermoplastic plastics | 15 | 23 | 4777 | 7324 | 0,01 | 2388 | 3662 | 0,012 | 1910 | 2929 | 0,015 | |
Soft and light wood | 21 | 30 | 6688 | 9554 | 0,012 | 3344 | 4777 | 0,014 | 2675 | 3821 | 0,017 | |
Compact and hard wood | 18 | 27 | 5732 | 8598 | 0,01 | 2866 | 4299 | 0,013 | 2292 | 3439 | 0,015 |
For dia. 6.3-8.0 | |||||||||
Material designation | Tensile strength | from dia. 6.3 | from dia. 8.0 | ||||||
vc | n | f | n | f | |||||
from | to | from | to | from | to | ||||
General structural steels | ≤ 850 N/mm² | 18 | 27 | 909 | 1364 | 0,027 | 716 | 1074 | 0,03 |
Unalloyed hardened steels | ≤ 850 N/mm² | 18 | 27 | 909 | 1364 | 0,027 | 716 | 1074 | 0,03 |
Low-alloy hardened steels | ≤ 850 N/mm² | 18 | 27 | 909 | 1364 | 0,027 | 716 | 1074 | 0,03 |
Unalloyed hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 758 | 1162 | 0,025 | 597 | 915 | 0,028 |
Low-alloy hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 758 | 1162 | 0,025 | 597 | 915 | 0,028 |
Alloyed hardened steels | ≤ 1,200 N/mm² | 10 | 15 | 505 | 758 | 0,025 | 398 | 597 | 0,028 |
Nitriding steels | ≤ 1,200 N/mm² | 10 | 15 | 505 | 758 | 0,025 | 398 | 597 | 0,028 |
Tool steels | ≤ 1,200 N/mm² | 10 | 15 | 505 | 758 | 0,025 | 398 | 597 | 0,028 |
High-speed steels | ≤ 1,200 N/mm² | 10 | 15 | 505 | 758 | 0,025 | 398 | 597 | 0,028 |
Cast iron | ≤ 350 HB | 15 | 23 | 758 | 1162 | 0,025 | 597 | 915 | 0,028 |
Nodular graphite and malleable iron | ≤ 350 HB | 15 | 23 | 758 | 1162 | 0,025 | 597 | 915 | 0,028 |
Aluminium | ≤ 600 N/mm² | 35 | 45 | 1769 | 2274 | 0,027 | 1393 | 1791 | 0,03 |
Thermosetting plastics | 15 | 23 | 758 | 1162 | 0,027 | 597 | 915 | 0,03 | |
Thermoplastic plastics | 15 | 23 | 758 | 1162 | 0,027 | 597 | 915 | 0,03 | |
Soft and light wood | 21 | 30 | 1061 | 1516 | 0,03 | 836 | 1194 | 0,033 | |
Compact and hard wood | 18 | 27 | 909 | 1364 | 0,03 | 716 | 1074 | 0,032 |
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 | |||||
General structural steels | ≤ 850 N/mm² | 18 | 27 | 1819 | 2729 | 0,017 | 1433 | 2149 | 0,02 | 1146 | 1719 | 0,025 |
Unalloyed hardened steels | ≤ 850 N/mm² | 18 | 27 | 1819 | 2729 | 0,017 | 1433 | 2149 | 0,02 | 1146 | 1719 | 0,025 |
Low-alloy hardened steels | ≤ 850 N/mm² | 18 | 27 | 1819 | 2729 | 0,017 | 1433 | 2149 | 0,02 | 1146 | 1719 | 0,025 |
Unalloyed hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 1516 | 2325 | 0,015 | 1194 | 1831 | 0,018 | 955 | 1464 | 0,021 |
Low-alloy hardened steels | ≤ 1,000 N/mm² | 15 | 23 | 1516 | 2325 | 0,015 | 1194 | 1831 | 0,018 | 955 | 1464 | 0,021 |
Alloyed hardened steels | ≤ 1,200 N/mm² | 10 | 15 | 1011 | 1516 | 0,015 | 796 | 1194 | 0,018 | 636 | 955 | 0,021 |
Nitriding steels | ≤ 1,200 N/mm² | 10 | 15 | 1011 | 1516 | 0,015 | 796 | 1194 | 0,018 | 636 | 955 | 0,021 |
Tool steels | ≤ 1,200 N/mm² | 10 | 15 | 1011 | 1516 | 0,015 | 796 | 1194 | 0,018 | 636 | 955 | 0,021 |
High-speed steels | ≤ 1,200 N/mm² | 10 | 15 | 1011 | 1516 | 0,015 | 796 | 1194 | 0,018 | 636 | 955 | 0,021 |
Cast iron | ≤ 350 HB | 15 | 23 | 1516 | 2325 | 0,015 | 1194 | 1831 | 0,018 | 955 | 1464 | 0,021 |
Nodular graphite and malleable iron | ≤ 350 HB | 15 | 23 | 1516 | 2325 | 0,015 | 1194 | 1831 | 0,018 | 955 | 1464 | 0,021 |
Aluminium | ≤ 600 N/mm² | 35 | 45 | 3538 | 4549 | 0,016 | 2786 | 3582 | 0,02 | 2229 | 2866 | 0,025 |
Thermosetting plastics | 15 | 23 | 1516 | 2325 | 0,016 | 1194 | 1831 | 0,02 | 955 | 1464 | 0,025 | |
Thermoplastic plastics | 15 | 23 | 1516 | 2325 | 0,016 | 1194 | 1831 | 0,02 | 955 | 1464 | 0,025 | |
Soft and light wood | 21 | 30 | 2123 | 3033 | 0,018 | 1672 | 2388 | 0,023 | 1338 | 1910 | 0,028 | |
Compact and hard wood | 18 | 27 | 1819 | 2729 | 0,018 | 1433 | 2149 | 0,022 | 1146 | 1719 | 0,027 |
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