DKOS fittings (P51S) IT - internal thread 

Straight fittings with o-ring in heavy version (S) with a 24-degree cone angle. DKOS are fittings that differ from the light version (L) DKOL by cone size - heavy versions have smaller cones. Heavy version fittings are used for transmitting higher pressure - they are used in hoses where higher working pressure is required. These types of fittings are also available in a version without an o-ring - these are DKS fittings, which have been practically phased out of use. P51 (DKOS) fittings are a fitting with a nut (most often it is a nut placed on the fitting body). DKOS can be connected (screwed) with another fitting with an external thread (they must have the same thread and the same cones). The matching fitting for DKOS is CES fitting -they are compatible because both are available in the heavy version, so their cones match each other. Fittings are also available in a 90-degree version (DKOS 90 elbow fitting) and at a 45-degree angle (DKOS 45 fitting) 

• made of free-cutting steel, zinc-plated 
• threads: metric