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2. Flange nut - Wikipedia

   en.wikipedia.org/wiki/Flange_nut

   Serrated flange nuts. A flange nut is a nut that has a wide flange at one end that acts as an integrated washer.This serves to distribute the pressure of the nut over the part being secured, reducing the chance of damage to the part and making it less likely to loosen as a result of an uneven fastening surface.

3. Wrench size - Wikipedia

   en.wikipedia.org/wiki/Wrench_size

   spanner (wrench) size and thread diameter of a hex nut. Width across flats is the distance between two parallel surfaces on the head of a screw or bolt, or a nut, mostly for torque transmission by positive locking. The term width across flats (AF) is used for the following forms: 2-socket = round material with two surfaces

4. Nut (hardware) - Wikipedia

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

   Square nut: Four-sided nut. Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening (though also greater resistance to tightening) [citation needed] Swage nut: Self-clinching nut Used on sheet metal.

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. Engineering drawing abbreviations and symbols - Wikipedia

   en.wikipedia.org/wiki/Engineering_drawing...

   Commonly used when measuring the corners of a hex drive, such as a hex nut. AF: across flats: Commonly used when measuring the flat surfaces of a hex drive, such as a hex nut. AFF above finished floor A dimension that establishes a distance away from the finished floor.

7. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   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. Compared to Allen hex sockets, the advantages of these bolts include higher torque capability and the lack of a recess to trap water.