Silicone Hose Size Guide: Inches to Millimetres
Know the measurement in millimetres but shopping for silicone hose in inches? Use this quick-reference chart to compare sizes up to 5 inches.
The chart covers common reference sizes. It is not a stock availability list; check the individual product for available sizes and specifications.
| Size in inches | Exact conversion in mm |
|---|---|
| 1/4″ | 6.35 |
| 3/8″ | 9.525 |
| 1/2″ | 12.7 |
| 5/8″ | 15.875 |
| 3/4″ | 19.05 |
| 7/8″ | 22.225 |
| 1″ | 25.4 |
| 1 1/4″ | 31.75 |
| 1 1/2″ | 38.1 |
| 1 3/4″ | 44.45 |
| 2″ | 50.8 |
| 2 1/4″ | 57.15 |
| 2 1/2″ | 63.5 |
| 2 3/4″ | 69.85 |
| 3″ | 76.2 |
| 3 1/4″ | 82.55 |
| 3 1/2″ | 88.9 |
| 3 3/4″ | 95.25 |
| 4″ | 101.6 |
| 4 1/4″ | 107.95 |
| 4 1/2″ | 114.3 |
| 4 3/4″ | 120.65 |
| 5″ | 127 |
Check the measurement before ordering
Check whether the product specifies inside diameter (ID) or outside diameter (OD), and compare like-for-like measurements. For a reducer, check both end sizes. This chart gives exact unit conversions, not a guarantee of fit or compatibility.
Quick conversion: inches × 25.4 = millimetres. To convert the other way, millimetres ÷ 25.4 = inches.
Unsure which size to choose? Contact SS Racetech Rods & Customs with your measurements and the part you are connecting to.
