Hinge Size Converter: Inches to mm
A code such as 4x3x3.0 is height × width in inches, then leaf thickness in millimetres. One inch is 25.4mm, so 4 × 3 is 101.6 × 76.2mm. The same code can still differ between materials, so check the leaf size each model lists below.
43 matches
| Model | Inches | Leaf size | Thickness | Bearings | Material |
|---|---|---|---|---|---|
| 3x2.5x2.5-2BB | 3" × 2.5" | 76.2 × 63.5mm | 2.5mm | 2 × ball bearing | Stainless Steel (304/201) |
| 3x3x2.5-2BB Rounded | 3" × 3" | 76.2 × 76.2mm | 2.5mm | 2 × ball bearing | Stainless Steel (304/201) |
| 4x3x2.5-1BB | 4" × 3" | 101.6 × 76.2mm | 2.5mm | 1 × ball bearing | Stainless Steel (304/201) |
| 4x3x2.5-2BB Centre Pivot | 4" × 3" | 100 × 75mm | 2.5mm | 2 × ball bearing | Stainless Steel (304/201) |
| 4x3x2.5-2BB Offset Pivot | 4" × 3" | 100 × 73mm | 2.5mm | 2 × ball bearing | Stainless Steel (304/201) |
| 4x3x2.5-4BB | 4" × 3" | 101.6 × 76.2mm | 2.5mm | 4 × ball bearing | Stainless Steel (304/201) |
| 4x3x3.0-0BB | 4" × 3" | 100 × 70mm | 3mm | 0 × ball bearing | Brass |
| 4x3x3.0-0BB Welded Knuckle | 4" × 3" | 101.6 × 76.2mm | 3mm | 0 × ball bearing | Stainless Steel (304/201) |
| 4x3x3.0-2BB Offset Pivot | 4" × 3" | 100 × 75mm | 3mm | 2 × ball bearing | Stainless Steel (304/201) |
| 4x3x3.0-2BB Rounded | 4" × 3" | 101.6 × 76.2mm | 3mm | 2 × ball bearing | Stainless Steel (304/201) |
| 4x3x3.0-2BB US | 4" × 3" | 101.6 × 76.2mm | 3mm | 2 × ball bearing | Stainless Steel (304/201) |
| 4x3x3.0-2DD | 4" × 3" | 101.6 × 76.2mm | 3mm | 2 × copper gasket | Brass |
| 4x3x3.0-4BB | 4" × 3" | 101.6 × 76.2mm (stainless) / 100 × 75mm (brass) | 3mm | 4 × ball bearing | Stainless Steel (304/201) / Brass |
| 4x3x3.0-4BB Rounded | 4" × 3" | 101.6 × 76.2mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) / Brass |
| 4x3x3.0-4BB US | 4" × 3" | 101.6 × 76.2mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) |
| 4x3x3.3-2BB | 4" × 3" | 100 × 79mm | 3.3mm | 2 × ball bearing | Brass |
| 4x3.5x3.0-2BB US | 4" × 3.5" | 101.6 × 89mm | 3mm | 2 × ball bearing | Stainless Steel (304/201) |
| 4x3.5x3.0-4BB | 4" × 3.5" | 101.6 × 89mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) / Brass |
| 4x3.5x3.0-4BB US | 4" × 3.5" | 101.6 × 89mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) |
| 4x3.5x4.0-2DD | 4" × 3.5" | 101.6 × 89mm | 4mm | 2 × copper gasket | Brass |
| 4x4x2.5-3D | 4" × 4" | 103 × 102mm | 2.5mm | — | Iron / Zinc Alloy |
| 4x4x3.0-2BB US | 4" × 4" | 101.6 × 101.6mm | 3mm | 2 × ball bearing | Stainless Steel (304/201) |
| 4x4x3.0-4BB | 4" × 4" | 101.6 × 101.6mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) / Brass |
| 4x4x3.0-4BB Double Security Stud | 4" × 4" | 101.6 × 101.6mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) |
| 4x4x3.0-4BB US | 4" × 4" | 101.6 × 101.6mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) |
| 4.5x4x3.0-2BB US | 4.5" × 4" | 114.3 × 101.6mm | 3mm | 2 × ball bearing | Stainless Steel (304/201) |
| 4.5x4x3.5-2BB US | 4.5" × 4" | 114.3 × 101.6mm | 3.5mm | 2 × ball bearing | Stainless Steel (304/201) |
| 4.5x4.5x3.5-2BB US | 4.5" × 4.5" | 114.3 × 114.3mm | 3.5mm | 2 × ball bearing | Stainless Steel (304/201) |
| 5x3x2.5-2BB Offset Pivot | 5" × 3" | 125 × 78mm | 2.5mm | 2 × ball bearing | Stainless Steel (304/201) |
| 5x3x3.0-2DD | 5" × 3" | 127 × 76.2mm | 3mm | 2 × copper gasket | Brass |
| 5x3x3.0-4BB | 5" × 3" | 127 × 76.2mm (stainless) / 125 × 75mm (brass) | 3mm | 4 × ball bearing | Stainless Steel (304/201) / Brass |
| 5x3x3.0-4BB Rounded | 5" × 3" | 127 × 76.2mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) |
| 5x3x4.0-4BB | 5" × 3" | 127 × 76.2mm | 4mm | 4 × ball bearing | Brass |
| 5x3.5x3.0-2BB Offset Pivot | 5" × 3.5" | 125 × 82mm | 3mm | 2 × ball bearing | Stainless Steel (304/201) |
| 5x3.5x3.0-4BB | 5" × 3.5" | 127 × 89mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) / Brass |
| 5x3.5x4.0-2DD | 5" × 3.5" | 127 × 89mm | 4mm | 2 × copper gasket | Brass |
| 5x4x3.0-4BB | 5" × 4" | 127 × 101.6mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) / Brass |
| 5x4x3.0-4BB Double Security Stud | 5" × 4" | 127 × 101.6mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) |
| 6x3.5x3.0-4BB | 6" × 3.5" | 152.4 × 89mm | 3mm | 4 × ball bearing | Stainless Steel (304/201) / Brass |
| 6x4x3.5-4BB | 6" × 4" | 152.4 × 101.6mm | 3.5mm | 4 × ball bearing | Stainless Steel (304/201) |
| 6x4x3.5-4BB Single Security Stud | 6" × 4" | 152.4 × 101.6mm | 3.5mm | 4 × ball bearing | Stainless Steel (304/201) |
| 8x4x3.5-4BB Single Security Stud | 8" × 4" | 203.2 × 101.6mm | 3.5mm | 4 × ball bearing | Brass |
| 8x4x3.5-6BB | 8" × 4" | 203.2 × 101.6mm | 3.5mm | 6 × ball bearing | Stainless Steel (304/201) |
How to measure
- Measure the leaf flat and open, height along the knuckle and width across both leaves.
- Measure thickness at the leaf, not at the knuckle.
- Routing in an existing door must match the new leaf, so compare the millimetre figure, not only the code.
Questions buyers ask
Is a 4x3 hinge always 101.6 × 76.2mm?
Not always. Some brass hinges with the same code measure 100 × 75mm. Each model below lists its own leaf size.
What does BB mean in a hinge code?
Ball bearings. 4BB means four ball bearings in the knuckle; 0BB means none.