A fastener receptacle comprising: a non-metal base (108, 302, 402, 502, 602, 702, 772) and at least one fastener cage integral with each other, wherein the base has a support surface (110, 310, 506, 608, 706) configured to be placed against a support structure, a first opening (168, 418, 720) for receiving a male fastener, and further including a fastener support surface (126, 312, 426, 708) configured such that the first opening extends from the support surface to the fastener support surface, the fastener cage having two side walls (132, 134; 420, 422; 740, 742) and an upper wall (136, 424, 738) spaced apart from the fastener support surface, the upper wall extending between and contacting the two side walls, wherein the upper wall (136, 424, 748) defines a second opening (156, 748) for receiving a fastener element body of a female fastener, coaxial with the first opening, wherein the second opening (156, 748) includes a reduced-width entrance (158, 322, 750) adapted to allow insertion of the female fastener into and removal of the female fastener from the fastener cage, when a guiding force is exerted on the female fastener, characterised in that it further comprises a column (170, 428, 744) extending upward from the fastener support surface to the upper wall and between the two side walls, said column defining two rear openings (172, 174; 430, 432; 756, 758) in the at least one fastener cage for receiving respective projections (180 - 188) of the female fastener (104, 788, 789), when the female fastener is positioned in the fastener cage, wherein the reduced-width entrance faces the two rear openings, the side wall surfaces and the column forming bearing elements providing three points of contact for receiving a torque loading applied by the female fastener when the male fastener is tightened down. a non-metal base (108, 302, 402, 502, 602, 702, 772) and at least one fastener cage integral with each other, wherein the base has a support surface (110, 310, 506, 608, 706) configured to be placed against a support structure, a first opening (168, 418, 720) for receiving a male fastener, and further including a fastener support surface (126, 312, 426, 708) configured such that the first opening extends from the support surface to the fastener support surface, the fastener cage having two side walls (132, 134; 420, 422; 740, 742) and an upper wall (136, 424, 738) spaced apart from the fastener support surface, the upper wall extending between and contacting the two side walls, wherein the upper wall (136, 424, 748) defines a second opening (156, 748) for receiving a fastener element body of a female fastener, coaxial with the first opening, wherein the second opening (156, 748) includes a reduced-width entrance (158, 322, 750) adapted to allow insertion of the female fastener into and removal of the female fastener from the fastener cage, when a guiding force is exerted on the female fastener, characterised in that it further comprises a column (170, 428, 744) extending upward from the fastener support surface to the upper wall and between the two side walls, said column defining two rear openings (172, 174; 430, 432; 756, 758) in the at least one fastener cage for receiving respective projections (180 - 188) of the female fastener (104, 788, 789), when the female fastener is positioned in the fastener cage, wherein the reduced-width entrance faces the two rear openings, the side wall surfaces and the column forming bearing elements providing three points of contact for receiving a torque loading applied by the female fastener when the male fastener is tightened down.