M20 Hex Bolt, Nut & Washer Plate Clamp Assembly

: Hexagonal Bolt, Nut and Washer Clamping Two Plates (M20) Examination Question Q1. Fig. 1 shows two mild-steel plates, 20 mm and 16 mm thick, clamped together by an M20 hexagonal-headed bolt, a plain washer and a hexagonal nut. Using AutoCAD, draw the assembly at full size and plot it on an A3 sheet at scale 2:1 in third-angle projection, showing: (a) front view with the plates in full section A–A and the bolt head and nut drawn across flats; (b) top view; (c) left side view with the bolt head and nut drawn across corners. Show chamfer curves on the head and nut and the conventional representation of the external thread. Give all dimensions, the thread designation, the tolerance on the clearance hole and the surface finish of the washer seating face. Complete the title block and the parts list. Views to be Drawn View Requirement Front view Full section A–A through bolt axis; plates hatched in opposite directions; bolt, washer, nut unsectioned; head & nut across flats (2 faces) Top view Plate outline, washer, hexagon nut, bolt end with thread convention; cutting plane A–A marked Left side view Placed on the LEFT of the front view; head & nut across corners (3 faces); hole shown hidden Dimensional Data (read with Fig. 1) Feature Value (mm) Bolt / thread M20 x 2.5, 6g; length under head 65; thread length 46 Bolt head 33 across flats, 38.1 across corners, 16 thick, 30° chamfer Hex nut 33 across flats, 38.1 across corners, 16 thick, 30° chamfer Washer Ø43 outer, Ø21 hole, 3 thick Plate A / Plate B 100 x 80, thickness 20 / 16 Clearance hole Ø22 H13 through both plates Bolt end Projects 10 beyond nut, chamfer 1.5 x 45° Surface finish Plate B top (washer seat) Ra 3.2

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