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  2. Countersink - Wikipedia

    en.wikipedia.org/wiki/Countersink

    Cross-hole countersink cutter. A cross-hole, "Weldon style" or "zero flute" countersink is a cone-shaped tool with a cutting edge provided by a hole that goes through the side of the cone. The intersection of the hole and cone form the cutting edge on the tool. The cone is not truly symmetrical as it is essential that the cone retreats away ...

  3. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    A countersink is a conical hole cut into a manufactured object; a countersink bit (sometimes called simply countersink) is the cutter used to cut such a hole. A common use is to allow the head of a bolt or screw, with a shape exactly matching the countersunk hole, to sit flush with or below the surface of the surrounding material.

  4. Engineering drawing abbreviations and symbols - Wikipedia

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

    An extensible series, covering various special threads. 2. Near side: The drawing notations "near side" and "far side" tell the reader which side of the part a feature is on, in occasional contexts where that fact is not communicated using the rules of projection alone. Contexts of usage are rather limited. See "far side" for examples. NSCM

  5. List of ISO standards 3000–4999 - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_standards_3000...

    ISO 3221:1998 Aerospace — Nuts, anchor, self-locking, fixed, 90 degrees corner, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C and 1 100 MPa (at ambient temperature)/425 degrees C — Dimensions

  6. Heat index of 100 degrees possible Tuesday, Wednesday in ...

    www.aol.com/heat-index-100-degrees-possible...

    Sunday's temperatures are expected to reach a high of 88 degrees, with a 30% chance of precipitation after 2 p.m. There is a 20% chance of showers and thunderstorms and a low of 68 degrees on Sunday.

  7. Severe storms in Minnesota, heat index surpasses 100 degrees ...

    www.aol.com/news/minnesota-weather-very-hot...

    An excessive heat warning is in place for the Twin Cities metro and areas to the south and east through at least 8 p.m. on Monday. The daytime high in the metro is 91 degrees, but the heat index ...

  8. Unrelenting heat: Phoenix hits 100 degrees for the 100th day ...

    www.aol.com/unrelenting-heat-phoenix-hits-100...

    Since then, the weather has risen to 100 degrees or above. The average temperature in Phoenix this summer was 98.9 degrees, with an average high of 110.4 and average low of 87.5.

  9. Rivet - Wikipedia

    en.wikipedia.org/wiki/Rivet

    Drawing of a round head rivets, 1898 A typical technical drawing of a universal head solid rivet Riveters work on the Liberty ship SS John W. Brown (December 2014).. Rivet holes have been found in Egyptian spearheads dating back to the Naqada culture of between 4400 and 3000 B.C. Archeologists have also uncovered many Bronze Age swords and daggers with rivet holes where the handles would have ...

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