Brass bellows :

Operating temperature -60 ℃ -+100℃

Lowest elasticity , and better solder ability , used as measuring celling in non- corrosive and low-precision instrument .

Stainless teel bellows -194℃ -+400℃

Excellent flexural fatigue strength and corrosion-resistance , better solder ability , used as meauring , sealing and compensating components .

types of joints : 1, both ends are external joints WW type  

                 2, both ends are internal joints   NN type

                 3, one end is external joints , the other with bottom   WDtype  

                 4, both ends are side cut from the trough QdQd type