help with fastner identification - NCRS Discussion Boards

help with fastner identification

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  • Mike M.
    NCRS Past President
    • May 31, 1974
    • 8365
    #1

    help with fastner identification

    is part #273446 a pan head phillips sheet metal screw or a hex head, or slotted? bet ole dave bartush knows the answer. i dont. mike mccagh
    Tags: None
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    • Gary C.
      Administrator
      • October 1, 1982
      • 17549
      #2
      Re: help with fastner identification

      Mike,

      Per 19578 P&A Group 8.970-8.977 part #273445
      Fastener 273446.jpg

      Gary
      ....
      NCRS Texas Chapter
      https://www.ncrstexas.org/
      https://www.facebook.com/profile.php?id=61565408483631
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        • Mike M.
          NCRS Past President
          • May 31, 1974
          • 8365
          #3
          Re: help with fastner identification

          gary: what's the significance of "Cr"? thanks, mike
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            • Harry S.
              Extremely Frequent Poster
              • July 31, 2002
              • 5258
              #4
              Re: help with fastner identification

              Is this it?

              273446.jpg


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                • Gary C.
                  Administrator
                  • October 1, 1982
                  • 17549
                  #5
                  Re: help with fastner identification

                  abbreviations from the P&A
                  Fasteners PA Abbreviations.jpg
                  NCRS Texas Chapter
                  https://www.ncrstexas.org/
                  https://www.facebook.com/profile.php?id=61565408483631
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                    • Mark F.
                      Extremely Frequent Poster
                      • July 31, 1998
                      • 1468
                      #6
                      Re: help with fastner identification

                      Originally posted by Mike McCagh (14)
                      gary: what's the significance of "Cr"? thanks, mike
                      Hi Mike,

                      Could it mean "Cross Recessed" as indicated in this link?

                      https://www.aspenfasteners.com/content/pdf/Metric_DIN_7981_spec.pdf
                      thx,
                      Mark
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                        • Mike M.
                          NCRS Past President
                          • May 31, 1974
                          • 8365
                          #7
                          Re: help with fastner identification

                          thanks to all . mike
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                            • Rod K.
                              Very Frequent User
                              • April 1, 1990
                              • 441
                              #8
                              Re: help with fastner identification

                              Believe that would be it, note the thread cutting (slot) tip.
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                                • Gary B.
                                  Extremely Frequent Poster
                                  • February 1, 1997
                                  • 6979
                                  #9
                                  Re: help with fastner identification

                                  Here are some sketches of the different point styles for self-tapping screws.

                                  D4FF5A9B-F9B8-4635-A949-FD7895181A06.jpg

                                  DA6C8D77-418D-4524-88AD-A2682C8B4138.jpg
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                                    • David B.
                                      Very Frequent User
                                      • March 1, 1980
                                      • 687
                                      #10
                                      Re: help with fastner identification

                                      You got your answer Mike, if you really want to be specific it is a type BT as indicated in above chart #25 and Harry's bag.
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                                        • Gary B.
                                          Extremely Frequent Poster
                                          • February 1, 1997
                                          • 6979
                                          #11
                                          Re: help with fastner identification

                                          David,

                                          Do you know the difference between point style 25 vs 23? Coarse vs fine pitch?

                                          Gary
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                                            • David B.
                                              Very Frequent User
                                              • March 1, 1980
                                              • 687
                                              #12
                                              Re: help with fastner identification

                                              Was wondering about that also -- A QUICK study shows the Type designated is for the particular material (alum., sheet metal, plastic etc.) and the hole size recommended for that particular application. Grouped as follows:
                                              Type A
                                              Types AB, B, and BP
                                              Types BF, BT and C
                                              Types D, F, G, and T
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                                                • Mike M.
                                                  NCRS Past President
                                                  • May 31, 1974
                                                  • 8365
                                                  #13
                                                  Re: help with fastner identification

                                                  you got it gary. type 23 cut fine threads in the al, zinc other soft metals and plastics.
                                                  type 25 are coarse thread cutters. agin, thanks to all who enlightened my sorry ass. mike
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