<ul><li>&quot;No man will make a great leader who wants to do it all himself, or to get all the credit for doing it.&quot;...
UNIT 2.10
<ul><li>When completed the student will understand: </li></ul><ul><li>Purpose and need of fasteners </li></ul><ul><li>Fast...
<ul><li>Why do we need fasteners? </li></ul><ul><li>To attach parts and components. </li></ul>
<ul><li>Why do we need to know about fasteners? </li></ul><ul><li>To ensure proper usage </li></ul><ul><li>Correct Torque ...
<ul><li>Bolt  </li></ul><ul><li>Screw (Self Tapping)  </li></ul><ul><li>Hex Nut  </li></ul><ul><li>Wing Nut  </li></ul><ul...
 
<ul><li>Diameter </li></ul><ul><ul><li>Measured across the threaded area </li></ul></ul><ul><li>Thread pitch (English syst...
 
<ul><li>A metric size bolt that is identified as  </li></ul><ul><li>6mm x 30mm x 1.25mm: </li></ul><ul><ul><li>Has a shank...
<ul><li>There are three basic types of threads used on fasteners: </li></ul><ul><li>Coarse threads </li></ul><ul><ul><li>U...
<ul><li>Also called tensile strength </li></ul><ul><li>Refers to the amount of pull a fastener can withstand before breaki...
 
 
<ul><li>There are millions of different fasteners. </li></ul>
 
<ul><li>NUT TYPES </li></ul>
<ul><li>Castle Nuts and Cotter Pins </li></ul><ul><li>Cotter Pins keep nuts from turning and possibly coming loose. </li><...
<ul><li>WASHER TYPES </li></ul><ul><li>Flat washer </li></ul><ul><ul><li>increases the clamping surface under the fastener...
<ul><li>A. Plain flat washer </li></ul><ul><li>B. Split lock washer </li></ul><ul><li>C. Toothed lock washer </li></ul><ul...
<ul><li>SNAP RINGS </li></ul><ul><li>Fits into a groove in a part and commonly holds shafts, bearings, gears, pins, and ot...
 
<ul><li>Key (A) </li></ul><ul><ul><li>prevents a part from turning on its shaft </li></ul></ul><ul><ul><li>fits into a key...
<ul><li>Requires a bolt to be tightened to a specific torque and then turned an additional number of degrees </li></ul><ul...
<ul><li>Used to make sure that parts are fastened evenly </li></ul><ul><li>Creates an even, gradual clamping force along t...
<ul><li>MINOR THREAD REPAIRS </li></ul><ul><li>Minor thread damage includes nicks, partial flattening, and other less seri...
<ul><li>MAJOR THREAD REPAIRS </li></ul><ul><li>Badly smashed or stripped threads may be repaired with either a tap or die ...
 
<ul><li>Hold the handle squarely with the work </li></ul><ul><li>Back the handle off to clean metal out of the threads </l...
<ul><li>Never force a tap handle or the tool may break </li></ul><ul><li>Keep the tap and die well oiled to ease cutting <...
 
<ul><li>When threads cannot be restored, the hole can be drilled and tapped oversize </li></ul><ul><li>Use a “drill and ta...
 
<ul><li>A. Drill the  </li></ul><ul><li>hole oversize </li></ul><ul><li>B. Tap the  </li></ul><ul><li>hole oversize </li><...
 
 
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Fastenerstfss3

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Fastenerstfss3

  1. 1. <ul><li>&quot;No man will make a great leader who wants to do it all himself, or to get all the credit for doing it.&quot; </li></ul><ul><li>Andrew Carnegie </li></ul>
  2. 2. UNIT 2.10
  3. 3. <ul><li>When completed the student will understand: </li></ul><ul><li>Purpose and need of fasteners </li></ul><ul><li>Fasteners Identification </li></ul><ul><li>Fastener grading </li></ul><ul><li>Fastener types </li></ul><ul><li>Torque to Yield </li></ul><ul><li>Torque Sequence </li></ul><ul><li>Thread Repair </li></ul>
  4. 4. <ul><li>Why do we need fasteners? </li></ul><ul><li>To attach parts and components. </li></ul>
  5. 5. <ul><li>Why do we need to know about fasteners? </li></ul><ul><li>To ensure proper usage </li></ul><ul><li>Correct Torque </li></ul><ul><li>To perform proper repairs </li></ul>
  6. 6. <ul><li>Bolt </li></ul><ul><li>Screw (Self Tapping) </li></ul><ul><li>Hex Nut </li></ul><ul><li>Wing Nut </li></ul><ul><li>Pop Rivet </li></ul>
  7. 8. <ul><li>Diameter </li></ul><ul><ul><li>Measured across the threaded area </li></ul></ul><ul><li>Thread pitch (English system) </li></ul><ul><ul><li>The number of threads per inch </li></ul></ul><ul><li>Thread pitch (Metric system) </li></ul><ul><ul><li>The distance in millimeters between two adjacent threads </li></ul></ul>
  8. 10. <ul><li>A metric size bolt that is identified as </li></ul><ul><li>6mm x 30mm x 1.25mm: </li></ul><ul><ul><li>Has a shank diameter of 6 millimeters. </li></ul></ul><ul><ul><li>Is 30 millimeters long from the bottom of the head to the end of the shank. </li></ul></ul><ul><ul><li>Has a distance of 1.25 millimeters between its threads. </li></ul></ul>
  9. 11. <ul><li>There are three basic types of threads used on fasteners: </li></ul><ul><li>Coarse threads </li></ul><ul><ul><li>UNC-Unified National Coarse </li></ul></ul><ul><li>Fine threads </li></ul><ul><ul><li>UNF-Unified National Fine </li></ul></ul><ul><li>Metric threads </li></ul><ul><ul><li>SI </li></ul></ul>
  10. 12. <ul><li>Also called tensile strength </li></ul><ul><li>Refers to the amount of pull a fastener can withstand before breaking </li></ul><ul><li>Bolt head markings specify the tensile strength of the bolt </li></ul><ul><li>U.S. customary bolts are marked with lines </li></ul><ul><li>Metric bolts are marked with numbers </li></ul>
  11. 15. <ul><li>There are millions of different fasteners. </li></ul>
  12. 17. <ul><li>NUT TYPES </li></ul>
  13. 18. <ul><li>Castle Nuts and Cotter Pins </li></ul><ul><li>Cotter Pins keep nuts from turning and possibly coming loose. </li></ul>
  14. 19. <ul><li>WASHER TYPES </li></ul><ul><li>Flat washer </li></ul><ul><ul><li>increases the clamping surface under the fastener </li></ul></ul><ul><ul><li>prevents the bolt or nut from digging into the part </li></ul></ul><ul><li>Lock washer </li></ul><ul><ul><li>prevents the bolt or nut from becoming loose under stress and vibration </li></ul></ul>
  15. 20. <ul><li>A. Plain flat washer </li></ul><ul><li>B. Split lock washer </li></ul><ul><li>C. Toothed lock washer </li></ul><ul><li>D. Lock plate </li></ul>
  16. 21. <ul><li>SNAP RINGS </li></ul><ul><li>Fits into a groove in a part and commonly holds shafts, bearings, gears, pins, and other components in place </li></ul><ul><li>Snap ring pliers are needed to remove and install a snap ring </li></ul><ul><ul><li>special jaws grasp the snap ring </li></ul></ul>
  17. 23. <ul><li>Key (A) </li></ul><ul><ul><li>prevents a part from turning on its shaft </li></ul></ul><ul><ul><li>fits into a keyseat (slot) cut into a shaft and a keyway cut into the mating part </li></ul></ul><ul><li>Set screw (B) </li></ul><ul><ul><li>normally used to lock a part onto a shaft </li></ul></ul><ul><ul><li>not as strong as a key </li></ul></ul>
  18. 24. <ul><li>Requires a bolt to be tightened to a specific torque and then turned an additional number of degrees </li></ul><ul><li>Procedure stretches the bolt to its correct yield point, preloading the fastener for better clamping under varying conditions </li></ul><ul><li>New bolts may be required each time </li></ul>
  19. 25. <ul><li>Used to make sure that parts are fastened evenly </li></ul><ul><li>Creates an even, gradual clamping force along the entire mating surface of the parts </li></ul><ul><li>Crisscross pattern is often recommended </li></ul>
  20. 26. <ul><li>MINOR THREAD REPAIRS </li></ul><ul><li>Minor thread damage includes nicks, partial flattening, and other less serious problems </li></ul><ul><li>Minor damage can be repaired with a thread chaser or a thread file </li></ul><ul><ul><li>the thread chaser is run through or over the threads to restore them </li></ul></ul>
  21. 27. <ul><li>MAJOR THREAD REPAIRS </li></ul><ul><li>Badly smashed or stripped threads may be repaired with either a tap or die </li></ul><ul><li>Tap </li></ul><ul><ul><li>threaded tool for cutting internal threads in holes </li></ul></ul><ul><li>Die </li></ul><ul><ul><li>cuts external threads on metal rods, bolts, shafts, and pins </li></ul></ul>
  22. 29. <ul><li>Hold the handle squarely with the work </li></ul><ul><li>Back the handle off to clean metal out of the threads </li></ul><ul><li>Use a taper tap to start the threads </li></ul><ul><li>Use a plug tap and a bottoming tap to cut the threads to the bottom of the hole </li></ul>
  23. 30. <ul><li>Never force a tap handle or the tool may break </li></ul><ul><li>Keep the tap and die well oiled to ease cutting </li></ul><ul><li>Use coarse threads when threading or tapping into soft metal, like aluminum </li></ul><ul><ul><li>coarse threads will hold better than fine threads </li></ul></ul>
  24. 32. <ul><li>When threads cannot be restored, the hole can be drilled and tapped oversize </li></ul><ul><li>Use a “drill and tap size chart” to choose a drill bit and tap </li></ul><ul><li>Drill the hole one size larger than the original hole </li></ul><ul><li>Cut new threads in the drilled hole </li></ul><ul><li>Use a larger bolt in the threaded hole </li></ul>
  25. 34. <ul><li>A. Drill the </li></ul><ul><li>hole oversize </li></ul><ul><li>B. Tap the </li></ul><ul><li>hole oversize </li></ul><ul><li>C. Mount the </li></ul><ul><li>insert on a mandrel </li></ul><ul><li>D. Thread the </li></ul><ul><li>insert into the hole </li></ul>

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