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  • okc63avanti
    replied
    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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  • DKing
    replied
    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

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  • long1776
    replied
    Bolts and capscrews, thank's for improving my english.

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  • Tom Bredehoft
    replied
    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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  • StudeRich
    replied
    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

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  • long1776
    replied
    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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  • Skip Lackie
    replied
    Are you sure they don't say "TR"? I've seen plenty of those.

    Skip Lackie
    Washington DC

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  • JGK 940
    replied
    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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  • long1776
    started a topic JR

    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.
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