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2. 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.

3. 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

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   An ASME B18.2.1 compliant cap screw has somewhat tighter tolerances than a hex bolt for the head height and the shank length. The nature of the tolerance difference allows an ASME B18.2.1 hex cap screw to always fit where a hex bolt is installed but a hex bolt could be slightly too large to be used where a hex cap screw is designed in. Fine ...

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. 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.

7. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   The hand tool for driving hex head threaded fasteners is a spanner (UK usage) or wrench (US usage), while a nut setter is used with a power screw driver. Modern screws employ a wide variety of screw drive designs, each requiring a different kind of tool to drive in or extract them. The most common screw drives are the slotted and Phillips in ...