It is certainly less strong than a full covalent bond.
They are a little looser than covalent bonds, if water is around.
The chains of covalent bonds continues in all directions without end.
Also, each carbon atom can form 4 single covalent bonds.
This structure is similar to that of diamond, and both have extremely strong covalent bonds.
In others, the atoms share electrons and form covalent bonds.
Single covalent bonds are formed when two atoms share an edge, as in structure C below.
This technique works almost exclusively on samples with covalent bonds.
Therefore, a single bond is a type of covalent bond.
They contrast to the characteristics of a covalent bond.