by axially extending walls 35 slot 32 is wide enough to accomodate the largest diameter wire with which it is intended the electrical connector 10 is to be used cap 14 of the first embodiment has a first outer component 36 which is preferably made of plastic or other insulative material with a serrated exterior to facilitate gripping inner component 38 is preferably metallic having an internal thread 40 which will mate with threaded portion 30 of bolt 12 this thread defines a first maximum inner dimension of the cap a recess 42 is formed in one end of the cap and defines a second maximum inner dimension greater than said first dimension recess 42 defines a shoulder 44 at its point of maximum extention into cap 14 and an annular surface 46 extending toward the end 48 of the cap an opening 50 is provided in the other end of the cap to provide access to component 38 this opening 50 permits the connection to be tested as best shown in fig2 a stripped wire end 52 is inserted into slot 32 in bolt 12 cap 14 is placed over bolt 12 and threads 40 of component 38 engaged with threads 30 of the bolt as the cap is tightened end 48 engages portions of wire 52 deflecting them downward toward the flange 18 the wire is forced downward and held firmly between slot bottom 34 and shoulder 44 the deflection of wire 52 into a non linear path brings the wire at least partially into contact axially extending walls 35 and further insures solid electrical contact depending on tolerances and the wire diameter wire 52 may be clamped between additional surfaces in this embodiment those surfaces can include walls 35 and annular internal surface 46 and or the.