fischer fixing-systems main-catalogue Page 241
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Concrete screw UltraCut FBS N · High performance steel anchors Loads Concrete screw FBS N Recommended loads of a single anchor¹) ²) in non-cracked concrete. FBS N Type Screw-in depth hnom [mm] 1/4 x 1-5/8 1/4 x 2-1/2 3/8 x 2-1/8 3/8 x 3 1/2 x 4 1/2 x 6 5/8 x 4 3/4 x 5-1/2 3/4 x 7 41 64 41 76 108 83 102 159 64 Recommended tensile loads in non-cracked normal weight concrete strength¹) ²) 2500 psi (17.3 Mpa) [kN] 1.4 3.5 2.6 5.3 4.8 7.2 5.6 7.2 16.7 3000 psi (20.7 Mpa) [kN] 1.5 3.8 2.9 5.8 5.3 7.7 6.1 8.0 18.3 4000 psi (27.6 Mpa) [kN] 1.6 4.4 3.2 6.6 5.9 8.5 6.9 9.2 20.9 6000 psi (41.4 Mpa) [kN] 1.9 5.4 3.7 7.6 6.9 10.1 8.5 11.2 25.7 8000psi (55.2 Mpa) [kN] 2.0 6.1 4.5 9.0 8.4 11.6 10.1 13.5 30.5 [kN] 2.6 2.6 7.7 7.7 17.0 17.0 30.9 38.6 38.6 Recommended shear loads in non-cracked normal weight concrete strength¹) ²) 2500 - 8000 psi (17.3 - 55.2 Mpa) Installation data Nominal drill diameter d0 [mm] 6.4 6.4 9.5 9.5 12.7 12.7 15.9 19.1 19.1 Min. drill depth at push-through mode h2 [mm] 54³) 76³) 57 76 89 121 95 114 171 Nominal screwing depth hnom1 ≥ [mm] 41 64 41 64 76 108 83 102 159 Anchor length l [mm] 41 64 54 76 102 152 102 140 178 Max. fixing thickness tfix1 ≤ [mm] - - 13 13 25 44 19 38 19 Clearance hole diameter df [mm] - - 13 13 16 16 19 22 22 Width across flats SW [mm] 12.7 12.7 14.3 14.3 19.1 19.1 23.8 26.8 26.8 Torque impact srcew driver Timpact [mm] 170 170 200 200 460 460 460 520 520 Min. member thickness hmin [mm] 83 89 110 125 138 171 146 168 237 Min. edge distance cmin [mm] 38 38 45 45 45 45 45 45 45 Min. spacing smin [mm] 38 38 76 76 76 76 76 76 76 ¹) Safety Factor of 4 is considered. ²) Concrete compressive strength must be at the specified minimum at the time of installation. In the case of combinations of tensile and shear loads, bending moments and reduced edge and axial spacing (anchor groups), the design must be carried out in accordance to the provisions of the valid standard. ³) Minimum drill hole depth h0 at pre-positioned installation. 241 4
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