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Dear 940v40,
Good p.m. and may this find you well. Further to rjk's excellent advice - to use Grade 8 bolts - you can recognize a Grade 8 bolt, as follows:
On the head, there will be six "lines", equally-spaced, running from the edge to the center; in between two of the lines, there may also be a single, small triangle [▴]. Some Grade 8 bolts also have a "gold" color, versus the "silver" of other grades (or no plating at all)
A lower-strength bolt - Grade 5 - will have three "lines". The lowest strength bolt - Grade 2 - will have a smooth head (no lines at all).
Be sure to use Grade 8 nuts. Get a bolt long enough to apply a Nylock outer nut (in addition to the Grade 8 nut). The nylock nut will help to ensure that nothing works loose.
Hope this helps.
Yours faithfully,
spook
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Install trailer hitch on 94 940 wagon [900][1994]