Thread: What towbar bolts?

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RAVE might have torque settings for the standard UK spec. towbar - but I just did them up until they seemed tight enough but not crazy-silly tight.

standard torque setting....

crank em up till they break and back it off half a turn.

Thanks blokes.

You seem to have got your answer, so to avoid another thread on a similar subject. Im waiting for a recovery point to come in from the States which will use those 4 holes. It didn't mention any mounting hardware comes with it, so what size bolts are they? 10mm?

If so, 4 10mm HT bolts held only by captive nuts with a 5 tonne recovery point, is that suited to heavy snatch jobs?

Oh Scallop, I need to know question number 3 also.

Originally Posted by Aaron

Oh Scallop, I need to know question number 3 also.

Here are the towbar bolt specs:

Rear face of rear chassis cross member -
4 x M10 bolts 35 long, 1 x spring washer each
These go into threaded holes so just test to see that they are in fact metric.

Underside of rear chassis cross member -
2 x M10 bolts 30 long, 1 x spring washer each.
Again, these holes are already threaded.

The info above came from Solmanic - Numpty said the bolts are 10mm. I'm going to get some today so if they are not I'll let you know.

Always specify the thread pitch. 10mm fasteners commonly come in 1.0, 1.25, and 1.5 pitch, and less commonly in 0.75 pitch. People have got into the bad habit of using, in this case, M10 and no mention of pitch. Now M10 is commonly used to describe a 10mm diameter fastener of 1.5 pitch which is ISO Coarse. Never assume that a metric fastener is of ISO Coarse pitch. Some metric diameters have no less than five pitches in more or less common use. This applies to inch sized fasteners also. Never just say 5/8" NF or 1/4" Whitworth, always specify the pitch, 5/8" x 18tpi NF or 1/4" x 20tpi BSW. Tool storemen and shop assistants are not usually fitters or engineers, don't give them room to think.

Originally Posted by Brian Hjelm

Always specify the thread pitch. 10mm fasteners commonly come in 1.0, 1.25, and 1.5 pitch, and less commonly in 0.75 pitch. People have got into the bad habit of using, in this case, M10 and no mention of pitch. Now M10 is commonly used to describe a 10mm diameter fastener of 1.5 pitch which is ISO Coarse. Never assume that a metric fastener is of ISO Coarse pitch. Some metric diameters have no less than five pitches in more or less common use. This applies to inch sized fasteners also. Never just say 5/8" NF or 1/4" Whitworth, always specify the pitch, 5/8" x 18tpi NF or 1/4" x 20tpi BSW. Tool storemen and shop assistants are not usually fitters or engineers, don't give them room to think.

Thanks Brian - so do you know what pitch bolts we need? Jeez - even getting bolts isn't easy!