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Please take note that this page is not set to full scale. Please download and print this full scale pdf so that you can lay your fitting over the appropriate drawing to determine the correct size fitting you have.
THE 3 BASIC ELEMENTS OF PLUMBING
In order to plumb your vehicle with a minimum amount of time, effort and money, you should know the basics about hose, hose ends and adapter fittings. Hose diameters are assigned AN numbers. Using your automotive hose size, choose from the chart below to find the AN equivalent for hose, hose ends and adapter fittings. For example: a 3/8" standard hose equals -6 AN.
Standard Automotive Hose Size
-AN Equivelent Hose Size
1/4"
=
-4 AN
3/8"
=
-6 AN
1/2"
=
-8 AN
5/8"
=
-10 AN
3/4"
=
-12 AN
1"
=
-16 AN
1-1/4"
=
-20 AN
1-1/2"
=
-24 AN
MALE AN ADAPTER IDENTIFICATION CHART
The line drawings below depict actual sizes of the various common AN thread sizes by dash number. Lay your fitting over the appropriate drawing to determine what size fitting you have.
PIPE THREAD SIZE CHART
Use the diagram below to find pipe thread size. Place fitting against base line; read fitting size where it intersects the vertical line.
AN Size
Metal Tube O.D.
Thread Size
-3 AN
3/16"
3/8" - 24 SAE
-4 AN
1/4"
7/16" - 20 SAE
-5 AN
5/16"
1/2" - 20 SAE
-6 AN
3/8"
9/16" - 18 SAE
-8 AN
1/2"
3/4" - 16 SAE
-10 AN
5/8"
7/8" - 14 SAE
-12 AN
3/4"
1-1/16" - 12 SAE
-16 AN
1"
1-5/16" - 12 SAE
-20 AN
1-1/4"
1-5/8" - 12 SAE
PROFLEX HOSE CHART
Use the chart below for ProFlex Hose Usage
AN Size
Acutal I.D.
Nominal I.D.
O.D
Max PSI
Typical Use
-4 AN
7/32"
1/4"
1/2"
1000
Small oil and fuel lines, fuel gauges, and vacuum lines
-6 AN
11/32"
3/8"
9/16"
750
Carburetor, fuel, and oil lines
-8 AN
7/16"
1/2"
5/8"
750
Fuel, oil, water lines
-10 AN
9/16"
5/8"
25/32"
750
Fuel, oil, water lines, heater hoses
-12 AN
11/16"
3/4"
29/32"
750
Fuel, oil, water lines, heater hoses
-16 AN
7/8"
1"
1-1/8"
750
Fuel, oil, water lines, heater hoses
-20 AN
1-1/8"
1-1/4"
1-7/16"
750
Fuel, oil, water lines
B-NUT SIZE CHART
The line drawings below depict actual sizes of the various common types of fittings, hose ends and adapters. The number in parenthesis is SAE wrench size equivalent.
HOSE INSTALLATION TIPS
HOW TO ASSEMBLE PROFLEX & PRORACE HOSE WITH FULL FLOW HOSE ENDS
HOW TO ASSEMBLE PROCLASSIC HOSE WITH CRIMP HOSE ENDS
HOW TO ASSEMBLE PROCLASSIC HOSE WITH FULL FLOW HOSE ENDS