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CHAPTERS
0:00 - Start
02:59 - Screw tapping
07:36 - Die cutting
10:02 - Screw cutting lathes
11:28 - Screw originating
16:48 - Thread standards
19:19 - Bolt heads
21:10 - Bolt varieties
25:32 - Torque
30:41 - Countersinking
33:52 - Stripped threads
38:35 - Wood screws
41:19 - Self tappers
43:39 - Castle threads
44:59 - Precision threads
46:42 - Bolted frames
51:04 - Bolt extraction