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  2. Thread angle - Wikipedia

    en.wikipedia.org/wiki/Thread_angle

    Diagram of a thread angle. In mechanical engineering, the thread angle of a screw is the included angle between the thread flanks, measured in a plane containing the thread axis. [1] This is a defining factor for the shape of a screw thread. Standard values include:

  3. Countersink - Wikipedia

    en.wikipedia.org/wiki/Countersink

    Countersink cutters are manufactured with six common angles, which are 60°, 82°, 90°, 100°, 110°, or 120°, with the two most common of those being 82° and 90°. Countersunk-head screws that follow the Unified Thread Standard very often have an 82° angle, and screws that follow the ISO standard very often have a 90° angle. Throughout ...

  4. 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.

  5. List of DIN standards - Wikipedia

    en.wikipedia.org/wiki/List_of_DIN_standards

    Designation system for fasteners: Active: DIN 963: Slotted countersunk head screws (with countersunk heads as specified in ISO 2009-1972) Withdrawn: DIN EN ISO 2009: ISO 2009: DIN 964: Slotted raised countersunk oval head screws: Withdrawn: DIN EN ISO 2010: ISO 2010: DIN 965: Cross recessed countersunk flat head screws: Withdrawn: DIN EN ISO ...

  6. Self-tapping screw - Wikipedia

    en.wikipedia.org/wiki/Self-tapping_screw

    The countersunk head has a Pozidriv recess. A self-tapping screw is a screw that can tap its own hole as it is driven into the material. More narrowly, self-tapping is used only to describe a specific type of thread-cutting screw intended to produce a thread in relatively soft material or sheet materials, excluding wood screws.

  7. Unified Thread Standard - Wikipedia

    en.wikipedia.org/wiki/Unified_Thread_Standard

    The number series of machine screws has been extended downward to include #00-90 (0.047 in = 0.060 in − 0.013 in) and #000-120 (0.034 in = 0.060 in − 2 × 0.013 in) screws; [3] however, the main standard for screws smaller than #0 is ANSI/ASME standard B1.10 Unified Miniature Screw Threads. This defines a series of metric screws named after ...

  8. List of screw and bolt types - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_and_bolt_types

    sex bolt, Chicago screw: A fastener comprising a mated pair of screw and post (binding barrel), which are a machine screw and a nut that is barrel-shaped. The nut has a flange and a protruding boss that is internally threaded. The bolt (mated pair, screw and post) sits within the components being fastened, and the flange provides the bearing ...

  9. Bolted joint - Wikipedia

    en.wikipedia.org/wiki/Bolted_joint

    Alternatively, measurement of the angular rotation of the nut can serve as the basis for defining screw extension based on the fastener's thread pitch. [11] Measuring the screw extension directly allows the clamping force to be very accurately calculated. This can be achieved using a dial test indicator, reading deflection at the fastener tail ...

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