Screw thread terminology
Parts of screw thread (Fig 1)
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| Parts of screw thread |
Major Diameter, Major Diameter Fig 2
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| Major Diameter Minor Diameter |
Right hand thread, Left hand thread Fig 3
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| Right hand thread Left hand thread |
BSW Thread Fig 1
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| BSW |
BA thread Fig 2
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| BA thread |
Unified thread Fig 3
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| Unified thread |
American National Thread Fig 4
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| American National Thread |
Screw pitch gauge Fig 1
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| Screw pitch gauge |
Hand taps internal threading of components Fig 1
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| Hand taps internal threading of components |
First tap or taper tap (Fig 2)
Second tap or intermediate tap (Fig 2)
Plug or bottoming tap (Fig 2)
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| First tap or taper tap
Second tap or intermediate tap Plug or bottoming tap |
Gun tap (Spiral pointed tap) Fig 1
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| Gun tap (Spiral pointed tap) |
Flute-less spiral pointed tap (Stub flute taps) (Fig 3)
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| Flute-less spiral pointed tap (Stub flute taps) |
Helical fluted taps/spiral fluted taps Fig 5
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| Helical fluted taps/spiral fluted taps |
Thread forming taps (Fluteless taps) Fig 7
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| Thread forming taps (Fluteless taps) |
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FITTER TOOLS