Silicone radiator coolant hoses are essential parts which you can use to keep vehicle engines cool. They carry coolant fluid between different components of the engine to prevent overheating. But every vehicle needs a specific size hose to accurately fit the connector. Because each hose has a unique internal diameter, length, wall thickness and outer diameter. In this reading, we explain the overall different sizes which will help you choose the right hose for your vehicle.
| Straight Coupler | Straight Reducer | 45 Degree Elbow | 45 Degree Reducer | 90 Degree Elbow | 90 Degree Reducer | 135 Degree Elbow | 180 Degree Elbow |
| Inner Diameter | Inner Diameter | Inner Diameter | Inner Diameter | Inner Diameter | Inner Diameter | Inner Diameter | Inner Diameter |
| 3/32" | 1 5/8" to 1 3/8" | 3/32" | 2" to 1 3/4" | 3/32" | 2 1/2" to 2" | 3/32" | 3/32" |
| 1/8" | 2" to 1 1/2" | 1/8" | 2" to 2 1/4" | 1/8" | 2 1/2" to 2 1/4" | 1/8" | 1/8" |
| 5/32" | 2 1/4" to 1 3/4" | 5/32" | 2-1/2" to 2" | 5/32" | 2 3/4" to 2 1/2'' | 5/32" | 5/32" |
| 3/16" | 2 1/4" to 2" | 3/16" | 2 1/2" to 2 1/4" | 3/16" | 3" to 2" | 3/16" | 3/16" |
| 1/4" | 2 1/2'' to 2'' | 1/4" | 2.75" to 2.25" | 1/4" | 3" to 2 1/2" | 1/4" | 1/4" |
| 9/32" | 3" to 2" | 9/32" | 2 3/4" to 2 1/2" | 9/32" | 3 1/2" to 3" | 9/32" | 9/32" |
| 5/16" | 3" to 2 1/4" | 5/16" | 3" to 2 1/2" | 5/16" | 1 3/4" to 2 1/2" | 5/16" | 5/16" |
| 3/8" | 3'' to 2 1/2'' | 3/8" | 3.5" to 3" | 3/8" | 4" to 3 1/2" | 3/8" | 3/8" |
| 7/16" | 3 3/4'' to 3 1/2'' | 7/16" | 4" to 3" | 7/16" | 1 1/2" to 1 3/4" | 7/16" | 7/16" |
| 1/2" | 3 1/2'' to 3'' | 1/2" | 4" to 3 1/2" | 1/2" | 2" to 2 3/4" | 1/2" | 1/2" |
| 5/8" | 4'' to 3'' | 5/8" | 3/4" to 5/8" | 5/8" | 3" to 2 1/4" | 5/8" | 5/8" |
| 3/4" | 4" to 3 1/2" | 3/4" | 1" to 3/4" | 3/4" | 1 1/4" to 1 1/2" | 3/4" | 3/4" |
| 7/8" | 4 1/2" to 4" | 7/8" | 1 1/8" to 1" | 7/8" | 1 3/4" to 2" | 7/8" | 7/8" |
| 1" | 1" | 1 1/4" to 1" | 1" | 2 3/4" to 3" | 1" | 1" | |
| 1 1/8" | 1 1/8" | 1" to 7/8" | 1 1/8" | 2 3/4" to 2 1/4" | 1 1/8" | 1 1/8" | |
| 1 3/16" | 1 3/16" | 1 1/2" to 1 3/8" | 1 3/16" | 1" to 3/4" | 1 3/16" | 1 3/16" | |
| 1 1/4" | 1 1/4" | 1 3/16" to 3/4" | 1 1/4" | 1" to 1 3/16" | 1 1/4" | 1 1/4" | |
| 1 3/8" | 1 3/8" | 1 3/8" to 1 3/16" | 1 3/8" | 1" to 1 1/4" | 1 3/8" | 1 3/8" | |
| 1 1/2" | 1 1/2" | 1 5/8" to 1 1/4" | 1 1/2" | 1 1/2" to 1 1/4" | 1 1/2" | 1 1/2" | |
| 1 5/8" | 1 5/8" | 1 3/4" to 1 3/16" | 1 5/8" | 2" to 2 1/8" | 1 5/8" | 1 5/8" | |
| 1 3/4" | 1 3/4" | 3" to 2 3/4" | 1 3/4" | 2 3/8" to 2" | 1 3/4" | 1 3/4" | |
| 1 7/8" | 1 7/8" | 3-3/4" to 3" | 1 7/8" | 1 3/4" to 1 1/4" | 1 7/8" | 1 7/8" | |
| 2" | 2" | 2 3/8" to 2" | 2" | 3" to 3 1/8" | 2" | 2" | |
| 2 1/8" | 2 1/8" | 3" to 2 3/8" | 2 1/8" | 2 1/2" to 1 1/2" | 2 1/8" | 2 1/8" | |
| 2 1/4" | 2 1/4" | 2 1/2" to 2" | 2 1/4" | 1 3/8" to 1 1/2" | 2 1/4" | 2 1/4" | |
| 2 3/8" | 2 3/8" | 3 1/2" to 3 1/8" | 2 3/8" | 2" to 1 5/8" | 2 3/8" | 2 3/8" | |
| 2 1/2" | 2 1/2" | 3 1/8" to 3" | 2 1/2" | 2" to 2 11/16" | 2 1/2" | 2 1/2" | |
| 2 9/16" | 2 9/16" | 2 3/4" to 2 3/8" | 2 9/16" | 3" to 2 11/16" | 2 9/16" | 2 9/16" | |
| 2 11/16" | 2 11/16" | 2 1/4" to 1 3/4" | 2 11/16" | 3 1/2" to 3 1/4" | 2 11/16" | 2 11/16" | |
| 2 3/4" | 2 3/4" | 3" to 2 1/4" | 2 3/4" | 3 1/4" to 3" | 2 3/4" | 2 3/4" | |
| 3" | 3" | 3 1/2" to 2 1/2" | 3" | 3" to 2 3/8" | 3" | 3" | |
| 3 1/8" | 3 1/8" | 2" to 1 1/2" | 3 1/8" | 2 3/4" to 1 3/4" | 3 1/8" | 3 1/8" | |
| 3 1/4" | 3 1/4" | 2" to 1 3/4" | 3 1/4" | 2 3/4" to 2 3/8" | 3 1/4" | 3 1/4" | |
| 3 1/2" | 3 1/2" | 2 3/4" to 2" | 3 1/2" | 2 1/4" to 1 3/4" | 3 1/2" | 3 1/2" | |
| 3 3/4" | 3 3/4" | 4" to 3 1/8" | 3 3/4" | 2" to 1 3/4" | 3 3/4" | 3 3/4" | |
| 4" | 4" | 3 1/2" to 2" | 4" | 4" to 3” | 4" | 4" | |
| 4 1/2" | 4 1/2" | 3" to 2" | 4 1/2" | 1 1/2" to 2" | 4 1/2" | 4 1/2" | |
| 5" | 5" | 5" | 2 1/4" to 2” | 5" | 5" | ||
| 6" | 6" | 6" | 1 5/8" to 1 3/4" | 6" | 6" |
Silicone Hose ID vs OD vs Wall Thickness Sizing Chart
Below we discuss the inner, outer diameter and wall thickness of silicone hoses in detail. So that you get an idea before selecting a silicone radiator hose.
|
Inner Diameter (ID) |
Outer Diameter (OD) |
Wall Thickness |
|
2 mm |
6 mm |
2 mm |
|
3 mm |
7 mm |
2 mm |
|
4 mm |
8 mm |
2 mm |
|
5 mm |
9 mm |
2 mm |
|
6 mm |
12 mm |
3 mm |
|
8 mm |
14 mm |
3 mm |
|
10 mm |
16 mm |
3 mm |
|
13 mm |
19 mm |
3 mm |
|
16 mm |
23 mm |
3.5 mm |
|
19 mm |
26 mm |
3.5 mm |
|
25 mm |
32 mm |
3.5 mm |
|
32 mm |
40 mm |
4.0 mm |
|
38 mm |
46 mm |
4.0 mm |
|
45 mm |
53 mm |
4.0 mm |
|
51 mm |
61 mm |
5 mm |
|
63 mm |
73 mm |
5 mm |
|
76 mm |
86 mm |
5 mm |
|
89 mm |
99 mm |
5 mm |
|
102 mm |
114 mm |
6 mm |
|
127 mm |
137 mm |
5 mm to 6 mm |
|
152 mm |
164 mm |
6 mm |
|
178 mm |
190 mm - 192 mm |
6 - 7 mm |
|
200 mm |
212 mm |
6 mm - 7 mm |
What Size Silicone Radiator Hose Do I Need?
To find the right size of silicone radiator hose, you need to measure the inside diameter of the old radiator hose of your vehicle by using a caliper or ruler. You should also measure or match the outer diameter of the metal pipe which connects to it, and exact required length. Because silicone hoses have specific size and they are sold by their internal diameter.
In addition you have to decide the wall thickness, angle or shape for it. You can use straight hose for simple gaps and different angles such as 45°, 90°, 135° and 180° for curve paths. You will find the size range from 25mm to 102mm+ which are easily available in the market. Standard automotive coolant hoses contain 3 to 4 layers of reinforcement which has wall thickness around 4mm to 4.5mm for pressure stability.
Final Thoughts
Hopefully you will understand different sizes of silicone hose after the above discussion. Now you have enough knowledge about the sizes of hose and how they measure. Therefore, before choosing the hoses, you must keep in mind our mentioned information.
Furthermore, if you want to purchase silicone hoses in various sizes in bulk quantity. You can contact our team and tell us your requirements. We will provide the best products according to your needs.
People Also Ask
Does Silicone Come in Small Tubes?
Yes, automotive silicone also comes in small tubes. You can mostly use them for coolant, vacuum, breather and small bypass lines in vehicles. However, you cannot use these small tubes as direct replacement for radiator hose. Some of these lack the strength to handle high heat and radiator pressure because they do not contain reinforcement fabric. These are commonly available in sizes ranging from 2mm to 19mm and used for low pressure automotive applications.
What is the Tolerance Range For Silicone Hose ID?
The tolerance range of inner diameter generally falls between ±0.1mm to ±0.5mm for standard commercial and industrial hoses. It is also based on the overall hose size, reinforcement type and manufacturing quality.
Does Hose Size Matter For Coolant Temperature?
Yes, hose size matters significantly for coolant temperature and entire cooling system stability. If you use the inaccurate inner diameter of the hose, then it changes the fluid movement speed and creates flow restriction. This disruption prevents the coolant from moving at the correct rate which can lead to overheating, wear components and poor pressure regulation.
