31. The heat of the screw will melt the plastic and cause it to cool around the screw threads . 32. Coach screws are large square-headed screws with a tapered wood screw thread , used for attaching ironwork to timber. 33. The first machines continually applied force with a spring and screw thread until the tablet started to break. 34. The screw thread pitch and drive nut design defines a specific load capacity that cannot be dynamically adjusted. 35. The National Electrical Code now prohibits this because the ears are small and have only three screw threads . 36. The Whitworth thread was the world's first national screw thread standard, devised and specified by Joseph Whitworth in 1841. 37. They consist of fasteners that capture and join other parts, and are secured with the mating of screw threads . 38. Standardization of screw threads has evolved since the early nineteenth century to facilitate compatibility between different manufacturers and users. 39. "It's the same way that you'd look to see if screw threads were all forced by God to be right-handed," 40. The user spoke into a recording horn while turning a crank which advanced the cylinder by a screw thread mechanism.
