Stepped Threaded Tap
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A square threaded tap or screw with three equal lengthed thickness. The stepped tap is used to fasten two materials together with unthreaded top.
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ScrewsSource
Grimshaw, Robert Modern Workshop Hints (Philadelphia, PA: Sampson Low Marston & Company LTD, 1902)
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2400×303, 149.1 KiB
1024×129, 26.1 KiB
640×80, 13.9 KiB
320×40, 5.6 KiB