How to choose the right size of the hose clamps?

How to choose the size of the hose clamps?

Hose clamp size refers to their clamping diameter range, which is listed as a minimum and maximum useable diameter. To determine the size needed, install the hose on the fitting or pipe (which expands the hose), measure the outside diameter of the hose, then select a clamp that accommodates that diameter in about the middle of its range.

Make sure that the diameter of your hose is greater than the minimum diameter of the clamp and less than the maximum diameter of the clamp. for example, knowing that our hose is 2″, I have determined that the range of 1″-3″ (SAE Size 40) is the clamp that would best fit my hose application. At the same time, more sizes such as SAE Size 36,44,48 are also suitable.

How to measure the diameter of the hose?

If there are professional tools such as micrometer calipers, you can measure the outer diameter of the hose according to the instructions of the professional tools. When measuring, be careful not to deform the hose without applying pressure. Directly measure the outer diameter (abbreviated as OD), take two measurements at right angles to each other, and then take the average value. Or measure the thickness of the hose after measuring the inner diameter,  the outer diameter is equal to the inner diameter plus twice the tube thickness.

For hoses with appropriate diameters and hose sections that are not deformed by the cutting operation, use an optical magnifying glass with 0.1mm graduations to take two measurements at perpendicular positions, and then take the average value.

If the hose is not particularly round, when high accuracy is required, the hose should be installed on the pipe for measurement to prevent the deformation of the hose from causing inaccurate data. If there is only a hose, you can measure the circumference （abbreviated as C）of the hose with a measuring tape, and then use the formula D=C/π (π≈3.1415926) to get the outer diameter .

Recommended selection the hose clamps

Hose clamps are used to seal hoses and pipes. Worm drive hose clamps are very popular because they are adjustable, easy to use and require no special tools—a screwdriver, nut driver or socket wrench is all that is needed to install and remove. A captive screw/worm gear mates with slots in the band to adjust the diameter of the clamp over a specified range. The band can be fully released (opened) so hose clamps can be installed on hoses and tubing already in place. 

Standard series hose clamps are the most common and are found in vehicle and industrial applications. Minimum clamp diameter is 3/8" and the typical maximum is about 8 7/16". They have 1/2" wide bands and 5/16" slotted hex head screws. These clamps meet or exceed SAE torque specifications.

Mini series hose clamps are used with small diameter hoses and tubing such as air, fluid and fuel lines. The minimum diameter is 6mm and the maximum can be customized as your ned. The bands are 5/16" wide and the screw is a 1/4" slotted hex head. Their small size permits installation in confined places.

W2 stainless steel hose clamps, which are recommended for most applications, have a stainless steel band; the plated screw and housing offer fair corrosion resistance. For good corrosion resistance, choose all stainless steel SS300 W4 clamps, which have a stainless steel band, screw and housing. 

Kingsun benefit is we can customize all the sizes to meet your special requirements.

More sizes available.