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A structural acrylic adhesive mixable in two parts, characterized by long open time relatively rapid curing time, good resistance properties and capacity for filling large spaces comprising polymerizable acrylic monomer and peroxy polymerization initiator in one part and a mixture of a transition metal compound and o-benzosulphamide in acrylic monomer in the second part. The prevent invention is directed to a structural adhesive system in two parts, mixable, applied as a single part and characterized by long open time, good resistance properties and relatively rapid curing time, anaerobic as well as aerobic, such as for filling spaces. More particularly, this invention involves an acrylic adhesive in two parts comprising in one part a polymerizable acrylic monomer and a peroxy polymerization initiator and in the second part a mixture of a transition metal compound and saccharine (o-benzosulphamide) such as acrylic monomer.