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2. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   A security hex screw drive features an extruded pin to make the fastener more tamper resistant by inserting a pin in the center of the female socket, requiring a tool with a corresponding hole to drive the fastener. This can also prevent attempts at turning the screw with a small flat-bladed screwdriver.

3. Hex key - Wikipedia

   en.wikipedia.org/wiki/Hex_key

   Hex keys of various sizes with ball ends. Tamper-resistant hex screws have a protruding pin in the center of the hex recess that prevents insertion of standard hex keys; as such, they can only be fastened and removed with a special key that has a recess for the pin. A similar "center pin reject" security feature is also used on torx screws.

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.

5. Set screw - Wikipedia

   en.wikipedia.org/wiki/Set_screw

   On a shaft, this may be simply a flattened area. A set screw may have any type of drive, such as hex or square head, slot, or recessed --- cross (Phillips), hex (Allen), star (Torx), or square (Robertson). In the UK, the term "set screw" or "setscrew" refers simply to a bolt which is fully threaded, with no smooth shank; called cap screw in the US.

6. Engineering drawing abbreviations and symbols - Wikipedia

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

   A cap screw with a socket head (usually implying a hex socket, driven with a hex key. SHN: shown: See Part number > Symmetrical parts for explanation. SHSS: socket head set screw: A set screw with a socket head (usually implying a hex socket, driven with a hex key. SI: Système international [d'unités] [International System of Units]

7. Americans forgot about $1.65 trillion in retirement savings ...

   www.aol.com/finance/americans-forgot-1-65...

   Americans have abandoned 29.2 million 401(k) accounts holding trillions in assets. You can find them using a new government database or calling past employers.