ISO 838 (2-Hole) vs. US 2-Hole Top Punch
Comparing 2 standards across 9 specifications. 9 key differences identified.
ISO 838 (DIN 821) is the international standard for 2-hole paper punching, specifying two circular holes spaced exactly 80.0 mm ± 0.5 mm apart with a diameter of 6.0 mm ± 0.5 mm, positioned 12.0 mm ± 1.0 mm from the binding edge of the sheet. It is the universal standard for ring binders and lever arch files across Europe, Asia, Africa, and Latin America.
The US 2-Hole Top Punch (standardized at 2.75 inches / 69.85 mm center-to-center spacing) is the North American standard for punching the short top edge of US Letter or US Legal documents. Paired with 2-prong metal fasteners, heavy classification pressboard folders, and clipboard arches, it is standard for medical charts and legal court exhibits.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Center-to-Center Hole Spacing
|
80.0 ± 0.5 mm (3.15 in) | 2.75 in (69.85 mm) |
|
Hole Diameter
|
6.0 ± 0.5 mm (0.24 in) | 5/16 in (7.94 mm) standard or 9/32 in (7.14 mm) |
|
Edge Distance to Hole Center
|
12.0 ± 1.0 mm (0.47 in) | 0.375 in (9.53 mm) from top edge |
|
Centering Standard
|
Holes are centered symmetrically along the paper's long edge (A4) or short edge (A5) | — |
|
Target Paper Pairing
|
ISO 216 A4 (210 × 297 mm) and A5 (148 × 210 mm) | — |
|
Binder Compatibility
|
2-ring binders, European lever arch files (Leitz Ordner, Esselte, Rexel) | — |
|
Placement Orientation
|
— | Centered along the top 8.5-inch edge of US Letter or US Legal sheets |
|
Fastener Pairing
|
— | 2-prong metal compressor fastener prongs (2.75 in base) |
|
Primary Applications
|
— | Hospital patient medical charts, courtroom deposition binders, real estate mortgage closings |