ME_365_HW12.pdf - ME 467 Homework 12 Fall 2012 QUESTIONS 1 Assuming “Proof Stress” is associated with the commercial term “Proof Load” a What is

ME_365_HW12.pdf - ME 467 Homework 12 Fall 2012 QUESTIONS 1...

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ME 467 Homework 12 Fall 2012 Page 1 of 5 QUESTIONS: 1. Assuming “Proof Stress” is associated with the commercial term, “Proof Load”, a. W hat is the equivalent SAE Grade bolt for the “alloy steel” bolt Proof Stress as noted in Table 31.2? You will want to use the tables in slides for file “20171204_Chapter 31_Mech_AssyA.pptx”, or just look up from - information/materials-and-grades/bolt-grade-chart.aspx Answer: Grade 8 matches proof load of 120,000 psi. b. How many marks are on the SAE Grade head? Answer: Grade 8 has 6 radial marks on the head. c. What is the equivalent metric class bolt for the same? Answer: 120,000 psi = 827.37 MPa, which corresponds to the Class 10.9 metric bolts (pretty close, at 830 MPa). d. What is the marking identification on the metric class bolt head? Answer: The class 10.9 bolts have 10.9 marked on the head. 2. What is the technical difference between a screw and a bolt? Answer: A screw is generally assembled into a (blind) threaded hole, whereas a bolt is assembled using a nut. 3. What is the term defined by “the maximum tensile stress that an externally threaded fastener can sustain without permanent deformation?” Answer: Proof Strength or Proof Load (it is noted in the very first question).
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