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  • JR

    JR, thats what I found on the heads of the bolts, or capscrews,after cleaning the engine bay.
    Does anyone know what it stands for? I don't think it's JR of Dallas fame, I mean, they all drove Mercedeses.

  • #2
    Can't say I know what your JR stands for but thanks for asking: I've always wondered what the proper plural of "Mercedes" was.

    Keoni Dibelka / HiloFoto
    In Hawai'i; on Hawai'i; on the Windward Side
    If da salt air never chew 'em up bumbye da lava will...

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    • #3
      Are you sure they don't say "TR"? I've seen plenty of those.

      Skip Lackie
      Washington DC
      Skip Lackie

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      • #4
        Yes, you're right. These bolts were holding the bracket for the temp sender, marked with 5 dashes, indicating strength of the bolt.
        TR is probably the name of a hardware manufacturer, would be interesting to know. BTW, what's the difference between a bolt and a cap screw? I've never seen this word in other workshop manuals I have.

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        • #5
          quote:Originally posted by long1776

          what's the difference between a bolt and a cap screw? I've never seen this word in other workshop manuals I have.
          BOLTS, get NUTS and capscrews do not, they usually screw into a threaded hole, but are sometimes the same as a bolt without a nut.

          StudeRich
          StudeRich
          Second Generation Stude Driver,
          Proud '54 Starliner Owner

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          • #6
            There are two components to a bolt. One is a nut, the other is a machine screw of some sort. Without the nut, it's just a screw.

            [img=left]http://www.alink.com/personal/tbredehoft/Avatar1.jpg[/img=left]
            Tom Bredehoft
            '53 Commander Coupe (since 1959)
            '55 President (6H Y6) State Sedan
            ....On the road, again....
            '05 Legacy Ltd Wagon
            All Indiana built cars

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            • #7
              Bolts and capscrews, thank's for improving my english.

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              • #8
                The fastener manufacturer can place their logo, letters on the head of the fastener. As noted, the lines identify the grade of the bolt.

                David

                [img=left]http://lh5.ggpht.com/_SuHaRG4eFas/SevU9Pcl-jI/AAAAAAAACJs/cRB5QokGtEs/s288/DSC01155.JPG[/img=left]
                David King

                1964 Studebaker Commander
                1958 Cadillac Eldorado Brougham (615)
                1966 Pontiac GTO convertible

                SDC Member#: A011937K
                sigpic

                David King

                1964 Studebaker Commander
                1958 Cadillac Eldorado Brougham (615)
                1959 Cadillac Eldorado Brougham (56)
                1960 Cadillac Eldorado Brougham (83)
                1966 Pontiac GTO convertible

                SDC Member#: A011937K

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                • #9
                  The "JR" or "TR" is probably the manufactuer's marking. The number of lines on head indicate grade and tensile strength.
                  Here's a chart to help ....



                  John


                  63R-2386 under restoration & modification
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                  John
                  63R-2386
                  Resto-Mod by Michael Myer

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