1 This International Standard lays down general and dimensional specifications for sealing connections to be applied to fluid power tubes. Two types of connection are dealt with in this International Standard:
— 24° flareless (bite) type fitting;
— 37° flare type fitting.
2 This International Standard details only the female half of the 24° flareless (bite) type fitting, leaving each manufacturer to qualify his own mating ferrule that will bite into the tubing outside diameter when tightened with an appropriate mating nut.
3 This International Standard also details all the com-ponents of the 37° flare fitting type, including the shape and size of the tubing flare. Both metric and inch outside diameter tubing is accommodated by merely changing the most economical component, the sleeve (see annex A). In the past fittings have been predominantly used with inch tubing.
4 Both the 24° flareless (bite) and 37° flare fittings can be used on tubular ends of hose fittings as well.
5 The 24° flareless (bite) fittings may be attached to heavier wall tubing than ca'n be accommodated by flaring, thus ac-counting for the higher nominal pressure ratings.
6 This International Standard also specifies methods, whereby the flare type can be adapted to machined flare ends that may be welded or brazed onto tubing or hose couplings. By doing this, heavier wall tubing, like the 24° cone type, can be accommodated and higher nominal pressures can be used.