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  1. #1
    Join Date
    Oct 2008
    Location
    Oregon
    Posts
    193

    Default Bolt Size and Grade

    I machined a plate to mount my 12 Volt electric winch on the tongue of my little trailer.

    The mounting studs from the original plate are 3/8 propietary shoulder bolts. I drilled the 3/8 flat bar that I had laying around and machined enough room on the bottom, to accept the lock washer and about half of the nut. That allowed me to use the same bolts, even though the flat bar is thicker than the original plate.

    I'm going to weld some 3 in x 1/8 flat bar to each side of the bottom of the plate that I made.

    When I mount it to my 3 in. trailer tongue will 3/8 Grade 8 be sufficient to bolt through the plate and the tongue, from the sides?

    I will use this 6000 lb (on a rolling load) winch to pull my 500 lb stacker onto the trailer.
    Millermatic 211 AutoSet w/MVP
    Century 110 volt 90/110 MIG-Gone to my son, in Texas
    Victor SuperRange OA
    Milwaukee Cold Cut Saw
    Milwaukee Portable Deep Cut Bandsaw
    Milwaukee Hole Hawg
    Jet Horizontal/Vertical Bandsaw
    Jet MD-18 Mill Drill
    Orbit Drill Press
    12 Ton Floor Press
    2002 E-350 V-10:
    1983 F-150 4.9L 6
    2004 Honda ST1300
    2007 Suzuki LTA400F Quad
    1997 Suzuki DR650

  2. #2
    Join Date
    Jul 2006
    Posts
    1,508

    Default

    Caution!
    These are "my" views based only on “my” experiences in “my” little bitty world.

  3. #3
    Join Date
    Oct 2008
    Location
    Oregon
    Posts
    193

    Default

    So then, a 3/8 grade 8 should be OK?
    I notice they show 3/8 x 24.
    Does that mean I shouldn't use coarse?
    Millermatic 211 AutoSet w/MVP
    Century 110 volt 90/110 MIG-Gone to my son, in Texas
    Victor SuperRange OA
    Milwaukee Cold Cut Saw
    Milwaukee Portable Deep Cut Bandsaw
    Milwaukee Hole Hawg
    Jet Horizontal/Vertical Bandsaw
    Jet MD-18 Mill Drill
    Orbit Drill Press
    12 Ton Floor Press
    2002 E-350 V-10:
    1983 F-150 4.9L 6
    2004 Honda ST1300
    2007 Suzuki LTA400F Quad
    1997 Suzuki DR650

  4. #4
    Join Date
    Jul 2006
    Posts
    1,508

    Default

    I would use 3/8 x 16.
    Caution!
    These are "my" views based only on “my” experiences in “my” little bitty world.

  5. #5
    Join Date
    Oct 2008
    Location
    Oregon
    Posts
    193

    Default

    I would too, thanks.
    Millermatic 211 AutoSet w/MVP
    Century 110 volt 90/110 MIG-Gone to my son, in Texas
    Victor SuperRange OA
    Milwaukee Cold Cut Saw
    Milwaukee Portable Deep Cut Bandsaw
    Milwaukee Hole Hawg
    Jet Horizontal/Vertical Bandsaw
    Jet MD-18 Mill Drill
    Orbit Drill Press
    12 Ton Floor Press
    2002 E-350 V-10:
    1983 F-150 4.9L 6
    2004 Honda ST1300
    2007 Suzuki LTA400F Quad
    1997 Suzuki DR650

  6. #6
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    948

    Default

    From the chart, and what you are saying you are going to pull I think a single #10 sheet metal screw would be the right size.

  7. #7
    Join Date
    Oct 2008
    Location
    Oregon
    Posts
    193

    Default

    Quote Originally Posted by walker View Post
    From the chart, and what you are saying you are going to pull I think a single #10 sheet metal screw would be the right size.
    I promise not to have you work on my trailer.
    Millermatic 211 AutoSet w/MVP
    Century 110 volt 90/110 MIG-Gone to my son, in Texas
    Victor SuperRange OA
    Milwaukee Cold Cut Saw
    Milwaukee Portable Deep Cut Bandsaw
    Milwaukee Hole Hawg
    Jet Horizontal/Vertical Bandsaw
    Jet MD-18 Mill Drill
    Orbit Drill Press
    12 Ton Floor Press
    2002 E-350 V-10:
    1983 F-150 4.9L 6
    2004 Honda ST1300
    2007 Suzuki LTA400F Quad
    1997 Suzuki DR650

  8. #8
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    948

    Default

    Ahh, come on, it was a joke! I'd use at least two for safety.

  9. #9
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,376

    Default

    You don't need fine thread or grade 8, 5 are plenty for most DIY work and preferable in a lot of cases. Toss the lock washer to get a full nut. Locks are not needed for most structural work, they been going by the wayside in a lot of applications.

  10. #10
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,376

    Default

    With correct design common grade 2 bolts will pull more than that winch.

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