Fig. 1From: Relationship between clamp force and pull-out strength in lag screw timber jointsTightening test method for lag screw timber joints. Reference mark the initial screw length = 42.7 mm for φ30 × 2.3 mm washers; 41.8 mm for φ32 × 3.2 mm washers; 40.5 mm for φ35 × 4.5 mm washersBack to article page