Spojke so kratki valji s prirobnico, z debelino sten do 3 mm (0,12` ) in s premerom od 75 mm (3` ) do 400 mm (16` ), izdelane pa so iz materiala z visokim razmerjem med trdnostjo in gostoto, opisanega v pojasnilih k temu oddelku.
The bellows is a short cylinder of wall thickness 3 mm (0,12") or less, a diameter of between 75 mm (3") and 400 m (16"), having a convolute, and manufactured from one of the high strength to density ratio materials described in the explanatory note to this section.