Other Stuff > Misc / Open
Cylinder Head Nuts
philward:
Rather than re-zinc the nuts or use those SS flanged nuts, I looked into original Honda nuts - CMSL 1.2O euro (but postage expensive), and DS were £2.40 each! Found these on ebay
https://www.ebay.co.uk/itm/Metric-Zinc-Plated-Steel-10-9-Grade-High-Tensile-None-Serrated-Flange-Nuts/112818931348?ssPageName=STRK%3AMEBIDX%3AIT&var=413246378350&_trksid=p2060353.m1438.l2649
I think they will be good enough?
Did read something on the net (but can't find it now) about rolled and cut threads affecting quality/effectiveness
K2-K6:
"Did read something on the net (but can't find it now) about rolled and cut threads affecting quality/effectiveness"
Yes, true. The Honda (and most load carriers) are ordinarily rolled. The difference is that rolling is effectively forging the thread shape by compressing the metal into the groove shaped from that process. As opposed to "cut" which uses a tap to remove metal and create the groove.
Compressing the steel into it's formed shape just makes it stronger compared to metal removal, also frictional torque can be different between the two as rolling usually leaves a refined/polished surface that's going to slide more easily at peak loading.
Each thing impacts the torqued procedure. Honda, with both stud and nut rolled I believe, state torque for this and dry (unless specific lubrication is noted) with a cut thread likely to measure higher but giving lower clamping pressure (pulls the stud less into tension before torque wrench clicks) and lubrication making it easier to turn the nut, so putting more load onto the stud before the wrench clicks.
Skoti:
M8 cylinder head flange nuts with 12mm heads here on Ebay:-
eBay item number:171567437209
https://www.ebay.co.uk/itm/M8x1-25-12mm-Hex-Head-Smooth-Metric-Flange-Nut-Cylinder-Frame-Ahrma-Elsinore/131186557034?epid=679345657&hash=item1e8b54006a:g:2OoAAOxyA4ZRLOKM
philward:
Skoti, great price but postage too high @ £24 (works out same total price as new Honda from Silvers)
Ken, good point, wasn't bothered about 12mm originality but never thought about the socket issue.
I think in light of all the variants in the nut make up/design/strength/etc as discussed in this thread, I'm going to re-zinc the existing nuts to be on the safe side. Good debate though and learned a lot - hopefully been beneficial to other members too. Thanks for all the input and advice.
Trigger:
Just get out in the cold and re plate 8) And don't forget to do the stud washers ;)
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