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Talk about the different aspects of your tow car and tow advice.

8.8/10.9 Galvanized vs non-galvinized towbar

replies: 4
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27 May 2007 @ 19:59:28 pm
Kaspaas Breekwater
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Greetings !! Are there any difference in strenght between the galvanized 8.8 bolts for the towbar, and the non-galvanized 8.8 Steel bolts/nuts which you buy from a specialized hardware shops ? The factory fitted towbar which came with my vehicle is fitted with 10.9 bolts, of the same size of the standard 8,8 bolts - which one is the best, as I don't seem to find replacements for the 10.9 ones ? The only reason why I want to replace them is that I removed them to fit my bicycle rack during the past week, and the threads are all rusted - strange for galvanized bolts - and I only have the vehicle for 6 months. On the 'ball' which I removed form the towbar, a sticker is attached with the following message on: " Use BS3692 Grade 8.8 M16 Bolts, and grade 8 nuts with lockwashers. Tighten to 240nm" 240nm is not much, as according to my vechile's Haynes manual the rearwheel hub must be torqued 405nm. Is 240nm the maximum thiss 8.8 bolts can handle ? What about the 10.9 bolts ? Any feedback much appreciated Kaspaas Breekwater (Hope my English is not that bad)
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28 May 2007 @ 12:46:32 pm
mplester
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Starting from the beginning. There is no difference between the bolts. Both are exactly the same with one going through a cold Gal process. As they are cold galvanised when initially tightened the coating cracks slightly which is why you see signs of rust. You could use nylon lock nuts rather than (spring) lock washers. Starngly enough most nut & bolt suppliers dont sell High Tensile bolts that are galvanized. A torque of 240Nm is more than enough for these bolts. Think of it this way wheel nots are between 90 & 110Nm. Hope this helps. By the way your English is 500 times better than my Afrikaans.
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28 May 2007 @ 17:52:33 pm
Kaspaas Breekwater
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Thank you Mark. . The exact lenght of bolt I was looking for was only available in Stainless Steel, instead of High Tensile Steel. Are both of them the same strenght, or is the Stainless Steel one stronger ? . Kaspaas Breekwater
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29 May 2007 @ 12:48:48 pm
mplester
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High Tensile is a lot stronger than stainless. The nut & bolt suppliers should be able to supply various lenght HT bolts, your problem could be finding a supplier that has a galvanized HT bolt the lenght you require. If this is the case you could have the bolts either plated are galvanised after. Plating is much thinner and will do the job perfectly.
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31 May 2007 @ 20:31:35 pm
Jorg
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Think if you do not use high-tensile bolts on your towball you will have to change your name to Kaspaas Breekhaak! Jokes aside there is a huge difference in tensile strength between HT and stainless bolts. ALWAYS use HT where safety is at stake such as the towball....
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