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2. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   Acorn nut (cap nut) Crown hex nut, blind nut, cap nut, domed cap nut, or dome nut A nut that has a domed end on one side Barrel nut: Steel cross dowel or dowel nut, cross dowel (woodworking) A round slug or formed sheet metal part with threads perpendicular to the length of the nut Cage nut: Caged nut, captive nut, clip nut

3. Acorn nut - Wikipedia

   en.wikipedia.org/wiki/Acorn_nut

   An acorn nut. An acorn nut, also referred to as crown hex nut, blind nut, cap nut, domed cap nut, or dome nut (UK), is a nut that has a domed end on one side. When used together with a threaded fastener with an external male thread, the domed end encloses the external thread, either to protect the thread or to protect nearby objects from contact with the thread.

4. Bolt (fastener) - Wikipedia

   en.wikipedia.org/wiki/Bolt_(fastener)

   Allow nuts to be attached to what is really a screw. Hex bolt - Bolt with a hexagonal head and threaded shank. Section immediately under head may be unthreaded for fastening thicker materials. J bolt - Bolt shaped like the letter J, used for tie downs. Only the straight section is threaded for a nut.

5. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   Hexagonal (generally abbreviated to "hex") head widths (width across flats, spanner size) are for DIN 934 hex nuts and hex head bolts. Other (usually smaller) sizes may occur to reduce weight or cost, including the small series flange bolts defined in ISO 4162 which typically have hexagonal head sizes corresponding to the smaller 1st choice ...

6. Flange nut - Wikipedia

   en.wikipedia.org/wiki/Flange_nut

   A self-aligning nut, also known as a spherical nut [2] or leveling nut, is a type of nut used in applications where the fastener is not perpendicular to the surface to which the nut anchors. A flange nut is used inside a specially shaped dished-out washer. The device is commonly used in the aerospace industry.

7. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   Thus, an M6 screw, which has a pitch of 1 mm, is made by threading a 6 mm shank, and the nut or threaded hole is made by tapping threads into a hole of 5 mm diameter (6 mm − 1 mm). Metric hexagon bolts, screws and nuts are specified, for example, in International Standards ISO 4014, ISO 4017, and ISO 4032. The following table lists the ...