The SDA packer for a Ø51 borehole is mounted on a 32mm SDA bolt and includes a stop washer, tightening washer, tightening tube, and nut. The length of the tightening tube is adjusted according to how far into the borehole you intend to put the packer.
The packer rubber is threaded a bit on the inside to seal against the threads, and the packer is also made of a slightly softer rubber than the regular packer so that it can be pushed to the stop washer.
SDA packers can also be manufactured for other types/sizes of SDA bolts and other borehole diameters. Figure 2 shows, for example, a conical SDA packer for an SDA rod diameter of 24 mm and a packer diameter of 47/60 mm.
