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  2. Lewis (lifting appliance) - Wikipedia

    en.wikipedia.org/wiki/Lewis_(lifting_appliance)

    A two-pinned lewis consists of two pins, linked by a short chain. The pins are inserted into opposing holes that are drilled into the top of the stone at about 15° from vertical. It operates by gripping the stone (like two fingers lifting a tenpin bowling ball) as the weight of the stone is taken up by a crane or winch.

  3. Scaffolding - Wikipedia

    en.wikipedia.org/wiki/Scaffolding

    Scaffolding for rehabilitation in Madrid, Spain [1] Scaffolding for renovation on the Virgin Mary statue, Santiago de Chile, Chile.. Scaffolding, also called scaffold or staging, [2] is a temporary structure used to support a work crew and materials to aid in the construction, maintenance and repair of buildings, bridges and all other human-made structures.

  4. List of DIN standards - Wikipedia

    en.wikipedia.org/wiki/List_of_DIN_standards

    This is an incomplete list of DIN standards. The "STATUS" column gives the latest known status of the standard . If a standard has been withdrawn and no replacement specification is listed, either the specification was withdrawn without replacement or a replacement specification could not be identified.

  5. Glossary of locksmithing terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_locksmithing_terms

    Master pin In a pin tumbler lock, a master pin is an optional, usually short, disk-like pin placed between the top and bottom pins. Its purpose is to allow two differently-cut keys to open the lock. Master pins are also called master wafers. Plug The plug is the part of a cylinder lock which is designed to turn when a key is inserted. Plug follower

  6. Positive locking device - Wikipedia

    en.wikipedia.org/wiki/Positive_locking_device

    The following is a list of positive locking devices: [1] A split beam nut; A castellated nut and a split pin; A hex nut or cap screw and a tab washer; A hex nut or cap screw and a lock plate; Safety wiring with various types of fasteners; 7-122. GENERAL. The word safetying is a term universally used in the aircraft industry.

  7. Clevis fastener - Wikipedia

    en.wikipedia.org/wiki/Clevis_fastener

    There are two main types of clevis pins: threaded and unthreaded. Unthreaded clevis pins have a domed head at one end and a cross-hole at the other end. A cotter pin (US usage) or split pin is used to keep the clevis pin in place. Threaded clevis pins have a partially threaded shank on one end and a formed head on the other.