Side-by-Side Comparison
Tool Drives & Bit Shanks
Circular Saw Arbors & Blades vs. Socket Square Drive Sizes
Comparing 2 standards across 13 specifications. 13 key differences identified.
Comparing:
Circular Saw Arbors & Blades
Socket Square Drive Sizes
Circular saw blade arbors (center mounting bore holes) are standardized into 5/8-inch (15.88 mm with diamond knockout for worm-drive saws), 1-inch (25.4 mm for table/miter saws), 20 mm, and 30 mm (European standard), paired with Alternate Top Bevel (ATB) or Triple Chip Grind (TCG) tooth geometries.
Square socket drives are standardized under ISO 1174-1 and ASME B107 into five standardized fractional inch drive square tiers: 1/4-inch, 3/8-inch, 1/2-inch, 3/4-inch, and 1-inch, each defining maximum safe working torque limits, retaining ball detent locations, and pin-hole locks.
Specification Comparison Table
13 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
ANSI B7.1 / EN 847-1 / ISO 293 / OSHA 1926.304 | ISO 1174-1 (Hand Tools) / ISO 1174-2 (Power / Impact Tools) / ASME B107.4M |
|
7-1/4" Circular Saw Arbor
|
5/8" (15.875 mm) round bore with diamond knockout insert (worm-drive framing saws) | — |
|
10" / 12" Table & Miter Saw Arbor
|
5/8" (10-inch North American) or 1.00" (25.4 mm 12-inch heavy-duty saws) | — |
|
European Standard Arbor (EN 847)
|
20.0 mm (cordless/plunge saws) and 30.0 mm (stationary table & panel saws) | — |
|
Standard Kerf Thickness
|
Full Kerf: 1/8" (3.18 mm) | Thin Kerf: 3/32" (2.38 mm for cordless power savings) | — |
|
ATB Tooth Grind
|
Alternate Top Bevel (15°–20° bevel) | Clean cross-cutting across wood grain | — |
|
TCG Tooth Grind
|
Triple Chip Grind (trapezoidal tooth + flat raker) | Melamine, laminates, non-ferrous aluminum | — |
|
1/4-Inch Drive (6.3 mm)
|
— | Drive Square: 6.35 mm | Torque Limit: ~30 to 45 N·m (22–33 lbf·ft) | Typical Socket Range: 4 mm to 14 mm (5/32" to 9/16") |
|
3/8-Inch Drive (10.0 mm)
|
— | Drive Square: 9.53 mm | Torque Limit: ~150 to 200 N·m (110–148 lbf·ft) | Typical Socket Range: 8 mm to 22 mm (5/16" to 7/8") |
|
1/2-Inch Drive (12.5 mm)
|
— | Drive Square: 12.70 mm | Torque Limit: ~500 to 650 N·m (370–480 lbf·ft) | Typical Socket Range: 10 mm to 36 mm (3/8" to 1-1/2") |
|
3/4-Inch Drive (20.0 mm)
|
— | Drive Square: 19.05 mm | Torque Limit: ~1,400 to 1,800 N·m (1,030–1,330 lbf·ft) | Semi-truck, tractor, structural bolting |
|
1-Inch Drive (25.0 mm)
|
— | Drive Square: 25.40 mm | Torque Limit: ~2,800 to 3,500 N·m (2,060–2,580 lbf·ft) | Heavy earthmoving machinery, mining, industrial |
|
Retaining Mechanisms
|
— | Spring-loaded steel ball detent (Chrome hand sockets) vs Pin-hole & rubber O-ring (Impact power sockets) |