Tech Basics - Bolt Identification

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This video is about Bolt Identification
  1. IMAT
  2. iMovie
  3. BOLTS
  4. threads
  5. 1/2-13
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The first digit on the metric bolt show the tensile strength and stand for how many 100 Megapascal (MPa) it can take. Example: the 8.8 bolt Has a tensile strength of 8x100 MPa or 800MPa and the 10.9 bolt has a tensile strength of 10x100 MPa or 1000 MPa.
The second digit stands for the yield strength. You take the second digit and divide it by ten (so it becomes a decimal) then multiple it to the tensile strength (first digit).
Example: the 8.8 bolt hade a tensile strength of 800 MPa, and the second digit is 8, so you divide 8 by 10 (8/10 = 0, 8), the you take 0, 8 x the tensile strength = yield strength(0, 8 x 800 = 640) and for the 10.9 it is (0.9 x 1000 = 900MPa)

andersgullersby
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Great video, but I'm pretty sure a "blank" bolt is Grade 2. That actually makes the marks make more sense: "blank" (2) + 3 lines is a Grade 5; "blank" (2) + 6 lines is a Grade 8

junquefaqaname