AN Hose Sizing

-AN (ARMY/NAVY) hose sizing is based on single and double-identification numbers.  Common sizes for performance automotive applications include -3, -4, -6, -8, -10, -12, -16, and -20 (the larger the number, the larger the hose diameter).

-3 and -4 sizes are typically used for brake line applications, small oil lines, some small fuel line applications, pressure gauges and vacuum lines.

-6 size is typically applicable for fuel and oil plumbing.

-8 size is typically used for fuel, coolant and oil plumbing.

-10 size is typically used for oil, fuel or heater hose plumbing.

-12 size is typically used for coolant, large fuel delivery or dry-sump oil.

-16 size is typically used for coolant, dry-sump oil or large fuel delivery.

-20 size is typically used for coolant (radiator hose).

 
*-AN HOSE SIZING CHART

Size

Nomical ID

Actual ID

Max Pressure(PSI)

3

3/16"

1/8"

1,000 - 1,500

4

1/4"

7/32"

1,000 - 1,500

6

3/8"

11/32"

1,000 - 1,500

8

1/2"

7/16"

1,000 - 1,500

10

5/8"

9/16"

750 - 1,250

12

3/4"

11/16"

500 - 1,000

16

1"

7/8"

750

20

1 1/4"

@1 1/8"

750

 

*Note:  Outside diameters may vary among hose materials.  Operating pressure ratings will vary depending on the specific type of hose construction.