Budynas-Nisbett:Shigley's Ill.Design of Mechanical 8.Screws,Fasteners,and T©The McGraw-Hil 413 Mechanical Engineering Elements the Design of Companies,2008 Design,Eighth Edition Nonpermanent Joints 410 Mechanical Engineering Design Figure 8-11 Types of heads used on machine screws. H H (a)Round head (b)Flat head H (c)Fillister head (d)Oval head (e)Truss head (f)Binding head H (g)Hex head(trimmed) (h)Hex head (upset) Figure 8-12 一H ←日+ Approx.in Approx.in →H Hexagonal nuts:(a)end view, general;(b)washer-foced regular nut;(d)regular nut chamfered on both sides; (d)jam nut with washer face; (e)jam nut chamfered on both sides. (a) (b) (c) (d) (e) 8-4 Joints-Fastener Stiffness When a connection is desired that can be disassembled without destructive methods and that is strong enough to resist external tensile loads,moment loads,and shear loads,or a combination of these,then the simple bolted joint using hardened-steel washers is a good solution.Such a joint can also be dangerous unless it is properly designed and assembled by a trained mechanic.Budynas−Nisbett: Shigley’s Mechanical Engineering Design, Eighth Edition III. Design of Mechanical Elements 8. Screws, Fasteners, and the Design of Nonpermanent Joints © The McGraw−Hill 413 Companies, 2008 410 Mechanical Engineering Design A H D L (a) Round head A D L H A (b) Flat head A H D L (c) Fillister head D L H (d) Oval head A H D L (e) Truss head W H D L (g) Hex head (trimmed) 80 to 82° 80 to 82° R A D L (f) Binding head 5° ±3° W H D L (h) Hex head (upset) Figure 8–11 Types of heads used on machine screws. 30 30 Approx. in W H (a) (b) (c) (d) (e) 30 H H 30 H Approx. in 1 64 1 64 Figure 8–12 Hexagonal nuts: (a) end view, general; (b) washer-faced regular nut; (c) regular nut chamfered on both sides; (d) jam nut with washer face; (e) jam nut chamfered on both sides. 8–4 Joints—Fastener Stiffness When a connection is desired that can be disassembled without destructive methods and that is strong enough to resist external tensile loads, moment loads, and shear loads, or a combination of these, then the simple bolted joint using hardened-steel washers is a good solution. Such a joint can also be dangerous unless it is properly designed and assembled by a trained mechanic