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2. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   This may be required to allow the correct seating for a countersunk-head screw or to provide the lead in for a second machining operation such as tapping. Countersink cutters are manufactured with six common angles, which are 60°, 82°, 90°, 100°, 110°, or 120°, with the two most common of those being 82° and 90°.

3. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25).

4. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   A 12-point screw drive uses two overlapped hexagon shapes, one rotated by 30°. Standard 12-point hex socket bits and wrenches fit these screws. The screw heads are typically flanged, and may fit into standard Allen hex socket cap screw counterbores molded or machined into parts to be fastened.

5. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   The number series of machine screws has been extended downward to include #00-90 (0.047 in = 0.060 in − 0.013 in) and #000-120 (0.034 in = 0.060 in − 2 × 0.013 in) screws; [3] however, the main standard for screws smaller than #0 is ANSI/ASME standard B1.10 Unified Miniature Screw Threads. This defines a series of metric screws named after ...

6. 5 types of winter squash you should start eating now - AOL

   www.aol.com/lifestyle/5-types-winter-squash...

   After a summer full of grilled zucchini and yellow squash, now is the perfect time to switch things up and cook some winter squash. So what exactly sets summer and winter squash varieties apart?

7. 49ers suspend De'Vondre Campbell for refusing to enter game ...

   www.aol.com/report-49ers-suspend-devondre...

   The San Francisco 49ers on Monday suspended linebacker De'Vondre Campbell for the final three games of the regular season for refusing to play Thursday night against the Los Angeles Rams.. Niners ...