Side-by-Side Comparison
Tool Drives & Bit Shanks
Drill Bit Shank Types & Sizing vs. Router & Tool Collet Sizes
Comparing 2 standards across 14 specifications. 14 key differences identified.
Comparing:
Drill Bit Shank Types & Sizing
Router & Tool Collet Sizes
Drill bit shanks are standardized under ISO 296, DIN 338, and proprietary power tool systems into Straight Round Shanks, 1/4" Quick-Change Hex Shanks (ISO 1173), SDS-Plus (10 mm / 2-groove), SDS-Max (18 mm / 3-groove), and Morse Taper (MT1–MT5) industrial spindle shanks.
Woodworking router collets and CNC machining spindles use precision slotted spring chucks standardized into fractional inch (1/4", 1/2") and metric (6 mm, 8 mm, 12 mm) wood router standards, alongside industrial ER Collets (ER11 to ER40, DIN 6499) with radial runout tolerances under 0.005 mm.
Specification Comparison Table
14 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
ISO 1173 / ISO 296 / DIN 338 / Bosch SDS Standard | DIN ISO 15488 (ER Collets) / DIN 6499 / ANSI Standards |
|
Straight Round Shank
|
Universal smooth cylindrical shank held in 3-jaw keyed or keyless chucks (0.5 mm to 13.0 mm / 1/2") | — |
|
1/4-Inch Hex Shank (Form E 6.3)
|
6.35 mm (1/4") with power ball detent groove (ISO 1173 Form E 6.3) | Prevents bit spin-out in impact drivers | — |
|
SDS-Plus Shank (10 mm)
|
10 mm diameter shank with 2 open drive splines + 2 closed ball-locking grooves | Rotary hammers up to 4 kg | — |
|
SDS-Max Shank (18 mm)
|
18 mm diameter heavy-duty shank with 3 open splines | Heavy demolition hammers and core drilling (5+ kg) | — |
|
Morse Taper 2 (MT2)
|
Taper 1:20.020 | Large diameter: 17.780 mm (0.700") | Drill presses, metal lathes, magnetic base drills | — |
|
Morse Taper 3 (MT3)
|
Taper 1:19.922 | Large diameter: 23.825 mm (0.938") | Industrial radial arm drills | — |
|
1/4-Inch Router Collet (6.35 mm)
|
— | Standard on trim routers and compact palm routers (up to 1.25 HP) | Light edge profiling |
|
1/2-Inch Router Collet (12.70 mm)
|
— | Standard on full-size plunge and table routers (2.25 HP to 3.25 HP) | 4× higher torsional rigidity than 1/4" |
|
Metric Router Standards (EU/UK)
|
— | 6 mm, 8 mm, 12 mm collet sleeves (8mm is popular for European mid-size plunge routers) |
|
ER11 Collet (CNC)
|
— | Outer Dia: 11.5 mm | Length: 18.0 mm | Clamping Range: 0.5 mm to 7.0 mm (Hobby/Desktop CNC) |
|
ER20 Collet (CNC)
|
— | Outer Dia: 21.0 mm | Length: 31.5 mm | Clamping Range: 1.0 mm to 13.0 mm (2.2 kW Spindles) |
|
ER32 Collet (Industrial)
|
— | Outer Dia: 33.0 mm | Length: 40.0 mm | Clamping Range: 2.0 mm to 20.0 mm (Production VMC Milling) |
|
Maximum Total Runout (TIR)
|
— | Standard Grade: ≤ 0.015 mm (0.0006") | Precision Grade (UP): ≤ 0.005 mm (0.0002") |