Binder Rings vs. Filofax 6-Hole
Comparing 2 standards across 13 specifications. 13 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 Filofax 6-Hole Standard (invented by Norman & Hill in London in 1921) is the global benchmark for personal ring planners, organizing 6 holes into two distinct 3-hole groups spaced 19.05 mm (0.75 in) apart. Available in standardized Personal (51 mm gap), A5 (70 mm gap), and Pocket (19 mm continuous) formats.
Specification Comparison Table
13 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 Grouping Structure
|
— | Two groups of 3 holes (19.05 mm / 3/4 in spacing within each 3-hole cluster) |
|
Personal Size Center Gap
|
— | 51 mm (2.0 in) gap between clusters — 19-19-51-19-19 mm (95 × 171 mm paper) |
|
A5 Size Center Gap
|
— | 70 mm (2.75 in) gap between clusters — 19-19-70-19-19 mm (148 × 210 mm paper) |
|
Pocket Size Spacing
|
— | Uniform 19.05 mm continuous spacing — 19-19-19-19-19 mm (81 × 120 mm paper) |
|
A5 Interchangeability
|
— | The middle holes of the two clusters (at 70+19+19 = 108 mm) align with US 3-hole spacing on some desk punches |
|
Primary Applications
|
— | Filofax, FranklinCovey, Gillio, Moterm, Kikki.K ring planners |