Binder Rings vs. Japanese Multi-Hole (JIS)
Comparing 2 standards across 14 specifications. 14 key differences identified.
Binder Ring Mechanisms (manufactured in Round Ring, Straight D-Ring, and Slanted Angle D-Ring profiles) are mechanical document holding spines sized by internal ring diameter from 0.5 inches (13 mm / 100 sheets) up to 4.0 inches (102 mm / 900 sheets). D-rings hold up to 25% more pages than round rings of the same nominal size by stacking pages against a flat vertical spine.
The Japanese Loose-Leaf standard (governed by JIS P 0138) specifies a fine multi-hole grid with an exact 9.5 mm (3/8 inch) pitch and 5.5 mm hole diameter, featuring 26 holes for B5 paper and 30 holes for A4 paper. Engineered by stationery manufacturers such as Kokuyo and Maruman, it eliminates paper tear-out entirely.
Specification Comparison Table
14 Parameters| Parameter / Spec | ||
|---|---|---|
|
0.5-inch Ring Capacity (13 mm)
|
Approx. 100 to 125 sheets (20 lb bond paper) | — |
|
1.0-inch Ring Capacity (25 mm)
|
Round Ring: 175 sheets | D-Ring: 220 to 250 sheets (+25% capacity) | — |
|
1.5-inch Ring Capacity (38 mm)
|
Round Ring: 275 sheets | D-Ring: 350 to 400 sheets | — |
|
2.0-inch Ring Capacity (51 mm)
|
Round Ring: 375 sheets | D-Ring: 480 to 540 sheets | — |
|
3.0-inch Ring Capacity (76 mm)
|
Round Ring: 450 sheets | D-Ring: 650 to 720 sheets | — |
|
4.0-inch Ring Capacity (102 mm)
|
D-Ring / Angle D-Ring only: 850 to 950 sheets (heavy-duty locking booster) | — |
|
Mounting Location
|
Round rings mount to spine; D-rings mount to back cover (enabling flat page opening) | — |
|
Hole Pitch (Center-to-Center)
|
— | 9.5 mm (0.374 in / approx. 3/8 in) |
|
Hole Diameter
|
— | 5.5 ± 0.5 mm |
|
Edge Margin to Hole Center
|
— | 6.5 ± 0.5 mm |
|
B5 Paper Hole Count
|
— | 26 holes (for 257 mm JIS B5 paper) |
|
A4 Paper Hole Count
|
— | 30 holes (for 297 mm ISO A4 paper) |
|
A5 Paper Hole Count
|
— | 20 holes (for 210 mm ISO A5 paper) |
|
Primary Applications
|
— | Kokuyo Campus Smart Ring binders, Maruman Giuris, King Jim multi-ring loose-leaf notebooks |