How To Determine

Nominal Size for your Hose
Clamp Application

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Method 1 for Hose Clamp Sizing
Using Dial Calipers
Use dial calipers to measure the outside diameter (O.D.) of the hose and fitting application with the hose assembled on the pipe or tube fitting as shown in illustration 1a. Use this measurement to specify the nominal clamp size.
Using Dial Calipers to Determine a Hose Clamp's Nominal Size
OR
Using Tape Rule
Use a narrow tape rule to measure the circumference of the hose and fitting application with the hose assembled on the pipe or tube fitting as shown in illustration 1b. Denote this as circumference, (c).

Use the formula:
Nominal Application Diameter
ND = c ÷ 3.1416

Using Tape Rule to Determine a Hose Clamp's Nominal Size
OR
Using "Pi" Tape Rule
Use a "pi" tape rule to measure the O.D. of the hose and fitting application with the hose assembled on the pipe or tube fitting as shown in illustration 1c. Use this measurement to specify the nominal clamp size.
Using "Pi" Tape Rule to Determine a Hose Clamp's Nominal Size





First
Use dial calipers to measure the O.D. of the pipe or tube fitting as shown in illustration 1d. This diameter may also be measured with a narrow tape rule or "pi" tape rule as shown in illustrations 1b and1c. Denote this dimension as diameter, (d).

Second
Use dial calipers to measure the material thickness of the hose as shown in illustration 1e. Denote the thickness dimension as thickness, (t).

Use the formula:
Nominal Application Diameter
ND = d + ( 2 x t )

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