[Paul Lower SoCal]

'AN' stands for army/navy. This is also the equivalent to'MS' for Military Standard. In other words they are government standards for material.

 

[Tom Mobley]

Phil,

>>Are they like "flare" fittings that you see in the hardware store?<<

No. AN fittings have an angle of 37 degrees, hardware store store stuff is 45 deg.

Tom

 

[Pat Kelley]

"No. AN fittings have an angle of 37 degrees, hardware store store stuff is 45 deg".

This is one way to insure the government pays more for a simple item.

 

[Tom Mobley]

Pat,

37 gives a tighter seal at the same wrench torque. This can be a factor where pressures are high. Aluminum threads really aren't worth a s**t.

Tom