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80 series recovery hook mounting.
Posted: Thu Aug 28, 2014 6:16 pm
by kiwipete
Hi all, I am looking for a suitable way to mount a pair of recovery hooks to the front of my Cruiser.
I have removed the factory tow eyes and note the hole spacings will not allow a hook to be mounted.
I have no plans of a winch bar for quite some time so want to mount the hooks in the interim.
Re: 80 series recovery hook mounting.
Posted: Thu Aug 28, 2014 9:11 pm
by skid
Right angle bracket mounted on underside of chassis with trussed braces and hook mounted sideways off that.
Mine was made by either Turoa or the Jew and its as strong as.
Hopefully attached pic works. Its not the closest shot but its all I got.
If I remember I will get a closer shot in the morning
Re: 80 series recovery hook mounting.
Posted: Fri Aug 29, 2014 11:18 am
by wjw
I just got a piece of 10 mm plate cut and drilled so I could offset the hook. means the hook was upside down, but was only temporary
Re: 80 series recovery hook mounting.
Posted: Fri Aug 29, 2014 1:22 pm
by 4WDbits
Re: 80 series recovery hook mounting.
Posted: Fri Aug 29, 2014 3:52 pm
by Big
For $25 I did this
Cheers
Re: 80 series recovery hook mounting.
Posted: Fri Aug 29, 2014 6:42 pm
by skid
Re: 80 series recovery hook mounting.
Posted: Fri Aug 29, 2014 6:49 pm
by skid
just shot outside and took a couple of pics for ya.
apologies if they are bright, the flash was rather close
Re: 80 series recovery hook mounting.
Posted: Fri Aug 29, 2014 7:09 pm
by kiwipete
Some awesome ideas coming, many thanks. I will have a wee think over the weekend but I do like Skids ones a lot. Will have to look into 4Wbits site too.
Re: 80 series recovery hook mounting.
Posted: Sat Aug 30, 2014 5:52 pm
by wopass
Big wrote: For $25 I did this
Cheers
and for your $25 job you should spend a couple more dollars and get better than grade 5 bolts
Re: 80 series recovery hook mounting.
Posted: Sat Aug 30, 2014 6:09 pm
by Batfastard
Your right on the money there uncle woopas
Re: 80 series recovery hook mounting.
Posted: Sat Aug 30, 2014 6:15 pm
by wopass
Batfastard wrote:Your right on the money there uncle woopas
Mmmmm....money.... need some to put gas in my decrepid old unloved dust covered stuck in storage shed ornament that looks like a 40 series...
Re: 80 series recovery hook mounting.
Posted: Sat Aug 30, 2014 6:49 pm
by mudlva
whilst sitting here at airport awaiting flight back to Ak i did some research
12.5mm class 5 imperial bolts (3 star) have a higher tensile strength than plastercien grade 8.8 bolts
ie class 5 = 75.72 grade 8.8 = 67.44
now here's the biggy class 8 (6 star) = 94.65 just about 50% better then grade 8.8
imperials all the way for better strength verse size
all the info is curtiscy from steelmasters website
http://www.steelmasters.co.nz/wawcs0141 ... nical.htmltensile load comparision
catch here is dont get confused between class 5 and class 8 to grade 8.8 etc metric grades are way different to to imperial
Re: 80 series recovery hook mounting.
Posted: Sun Aug 31, 2014 12:10 am
by churchill
Be careful here all.
Grade 5 is approximatly equal to grade 8.8 metric in tensile strength.
Grade 8 is approximatly equal to grade 10.9 metric in tensile strength.
There is a grade 12.9 metric that is better than grade 8.
What needs to be taken into account is the bolt diameter. The larger the diameter the higher the load it can handle which is where the above post holds true as it compares a 12mm bolt to a 12.7mm bolt. In essence both bolts are made from the same strength material but one is larger in diameter thus can hold more load.
Re: 80 series recovery hook mounting.
Posted: Sun Aug 31, 2014 12:34 am
by churchill
Forgot to add that thread pitch also has an effect on the bolt load capacity. Finer pitches can carry more load due to the increase in the root diameter of the bolt. Basically you need to find the load rating of the fastener with the correct diameter, thread pitch and grade get a good comparison.
Just because its imperial doesn't mean its stronger or have a better strength to size ratio.
Re: 80 series recovery hook mounting.
Posted: Sun Aug 31, 2014 8:20 am
by mudlva
so going back to original comment class 5 1/2"imp bolt is equal to or grater then a 12mm grade 8.8 bolt, that's pretty much what i thought and found evidence to back it up. thread pitch is a different subject and finer threads are way stronger at clamping and if put in shear loading, but they will pull out of alloy in a split moment.
knowledge exceeded and brain now hurts
Re: 80 series recovery hook mounting.
Posted: Sun Aug 31, 2014 9:33 am
by Big
So with all that.. Im ok with ma bolts..
Can't remember but I was sure they were as strong or better..
Re: 80 series recovery hook mounting.
Posted: Sun Aug 31, 2014 9:45 am
by lax2wlg
mudlva wrote: brain now hurts
Solution = Beer
Re: 80 series recovery hook mounting.
Posted: Sun Aug 31, 2014 2:18 pm
by wopass
depends on how you look at it Big,
if you got to a trip and the person doing the checking of hook bolts couldn't identify what they were, ie: 3 dash bolts then no, as there are no numbers to identify its grade and as a general rule a 3 dash bolt is only a medium tensile material so again, not really...
having said that i have seen mild steel bolts on hooks and they work just fine to
always best to have a big buffer of safety on your hands when recovering which is why i always use fine thread cap head bolts which are grade 12.9
as i said before, only a few more dollars to know there is no question your bolts are strong enough
big motor
big wheels
big winch
small hook bolts
Re: 80 series recovery hook mounting.
Posted: Sun Aug 31, 2014 2:50 pm
by Big
wopass wrote:depends on how you look at it Big,
if you got to a trip and the person doing the checking of hook bolts couldn't identify what they were, ie: 3 dash bolts then no, as there are no numbers to identify its grade and as a general rule a 3 dash bolt is only a medium tensile material so again, not really...
having said that i have seen mild steel bolts on hooks and they work just fine to
always best to have a big buffer of safety on your hands when recovering which is why i always use fine thread cap head bolts which are grade 12.9
as i said before, only a few more dollars to know there is no question your bolts are strong enough
big motor
big wheels
big winch
small hook bolts
hahaha ok fair comment..
I did replace 1 hook bolts with 8.8 coarse thread though..
so should be adequate.. but I am going to change all of them with cap bolts as you have for the added security..
But you know gotta get around toit...
Re: 80 series recovery hook mounting.
Posted: Sun Aug 31, 2014 5:27 pm
by kiwipete
Back on topic please gents.
Re: 80 series recovery hook mounting.
Posted: Sun Aug 31, 2014 9:44 pm
by wopass
on the side of the chassis just like in Big's pic
Big wrote: Cheers
front hook on my 80 is in almost the exact same spot
from memory you can pick up the holes that have captured nuts
i just tried to take a pic but phone went flat
Re: 80 series recovery hook mounting.
Posted: Mon Sep 01, 2014 10:18 pm
by churchill
Grade 8.8 M12 course thread is standard fitment so grade 5 1/2 inch is better.
Re: 80 series recovery hook mounting.
Posted: Tue Sep 23, 2014 10:56 am
by kbjj
Big wrote:wopass wrote:depends on how you look at it Big,
if you got to a trip and the person doing the checking of hook bolts couldn't identify what they were, ie: 3 dash bolts then no, as there are no numbers to identify its grade and as a general rule a 3 dash bolt is only a medium tensile material so again, not really...
having said that i have seen mild steel bolts on hooks and they work just fine to
always best to have a big buffer of safety on your hands when recovering which is why i always use fine thread cap head bolts which are grade 12.9
as i said before, only a few more dollars to know there is no question your bolts are strong enough
big motor
big wheels
big winch
small hook bolts
hahaha ok fair comment..
I did replace 1 hook bolts with 8.8 coarse thread though..
so should be adequate.. but I am going to change all of them with cap bolts as you have for the added security..
But you know gotta get around toit...
Mmm, with recovery hook bolts, can you be too high in tensile rating? ie too brittle, not so tough?
Re: 80 series recovery hook mounting.
Posted: Wed Sep 24, 2014 9:32 pm
by johnny262
kbjj wrote:Mmm, with recovery hook bolts, can you be too high in tensile rating? ie too brittle, not so tough?
Yeah thats my understanding of it too, probably even read it on here
Im sure those in the the know will soon clarify that for us...
Re: 80 series recovery hook mounting.
Posted: Thu Sep 25, 2014 8:35 am
by Colinl
about 100 bucks to make your own pair if you can do cad drawings., As for bolts just make sure the shear faces are on the bolt shank, seen people use screws and shear load the threads which makes it pretty manky & reduces max shear loads considerably. i.e m12x1.5 bolt loaded on threads you have a effective bolt body of 9mm compared to 12.
Re: 80 series recovery hook mounting.
Posted: Fri Sep 26, 2014 12:29 pm
by Cheesy_Dave
After the dealings I have had with Q235 I hope you have each batch tested before manufacture. We had some pretty big variances in strength and ductility and from memory the limits on composition are not very tight with this spec either.
bolt straight on