Specially designed self-tightening (ST) inlet and transfer-line column nuts maintain a leak-free seal over more than 300 injections using 85/15 Vespel/graphite (or polyimide/graphite) ferrules. In contrast, standard column nuts using the same type of ferrule require retightenting within just a few injections. Another advantage of the ST column nuts is that ferrules are easily removed after use, rather than having to be dug out of a standard transfer-line nut.
Publication number: 5991-3612EN.pdf
Publication Date: November 22, 2013