80 series recovery hook mounting.

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kiwipete
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80 series recovery hook mounting.

Postby kiwipete » Thu Aug 28, 2014 6:16 pm

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.
20140828_165823.jpg


I have no plans of a winch bar for quite some time so want to mount the hooks in the interim.
Attachments
20140828_165815.jpg
Ok people, move along. Nothing to see here. Thank you, move along.
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skid
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Re: 80 series recovery hook mounting.

Postby skid » Thu Aug 28, 2014 9:11 pm

DSCF2643.jpg


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 ;-)
80 Series on 35" creepies, manual with twin factory lockers.
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wjw
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Re: 80 series recovery hook mounting.

Postby wjw » Fri Aug 29, 2014 11:18 am

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
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4WDbits
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Re: 80 series recovery hook mounting.

Postby 4WDbits » Fri Aug 29, 2014 1:22 pm


Big
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Re: 80 series recovery hook mounting.

Postby Big » Fri Aug 29, 2014 3:52 pm


:shock: For $25 I did this
Image

Cheers

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skid
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Re: 80 series recovery hook mounting.

Postby skid » Fri Aug 29, 2014 6:42 pm

20140829_183806.jpg
80 Series on 35" creepies, manual with twin factory lockers.
0272417757

*CHILLAX BRO.*

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skid
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Re: 80 series recovery hook mounting.

Postby skid » Fri Aug 29, 2014 6:49 pm

20140829_184602.jpg



just shot outside and took a couple of pics for ya.
apologies if they are bright, the flash was rather close ;-)
80 Series on 35" creepies, manual with twin factory lockers.
0272417757

*CHILLAX BRO.*

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kiwipete
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Re: 80 series recovery hook mounting.

Postby kiwipete » Fri Aug 29, 2014 7:09 pm

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.
Ok people, move along. Nothing to see here. Thank you, move along.
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wopass
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Re: 80 series recovery hook mounting.

Postby wopass » Sat Aug 30, 2014 5:52 pm

Big wrote: :shock: For $25 I did this
Image

Cheers


:shock: and for your $25 job you should spend a couple more dollars and get better than grade 5 bolts :wink:
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Re: 80 series recovery hook mounting.

Postby Batfastard » Sat Aug 30, 2014 6:09 pm

Your right on the money there uncle woopas

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Re: 80 series recovery hook mounting.

Postby wopass » Sat Aug 30, 2014 6:15 pm

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... :lol:
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Re: 80 series recovery hook mounting.

Postby mudlva » Sat Aug 30, 2014 6:49 pm

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.html
tensile 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

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churchill
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Re: 80 series recovery hook mounting.

Postby churchill » Sun Aug 31, 2014 12:10 am

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.

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Re: 80 series recovery hook mounting.

Postby churchill » Sun Aug 31, 2014 12:34 am

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.

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Re: 80 series recovery hook mounting.

Postby mudlva » Sun Aug 31, 2014 8:20 am

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 :shock:

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Re: 80 series recovery hook mounting.

Postby Big » Sun Aug 31, 2014 9:33 am

So with all that.. Im ok with ma bolts.. :lol: Can't remember but I was sure they were as strong or better..

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Re: 80 series recovery hook mounting.

Postby lax2wlg » Sun Aug 31, 2014 9:45 am

mudlva wrote: brain now hurts :shock:


Solution = Beer

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Re: 80 series recovery hook mounting.

Postby wopass » Sun Aug 31, 2014 2:18 pm

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 :shock:

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 :wink:

big motor :twisted:

big wheels :twisted:

big winch :twisted:

small hook bolts :?:


:mrgreen:
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Re: 80 series recovery hook mounting.

Postby Big » Sun Aug 31, 2014 2:50 pm

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 :shock:

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 :wink:

big motor :twisted:
big wheels :twisted:
big winch :twisted:
small hook bolts :?: :mrgreen:


:mrgreen:

hahaha ok fair comment.. :mrgreen: I did replace 1 hook bolts with 8.8 coarse thread though.. :roll: so should be adequate.. but I am going to change all of them with cap bolts as you have for the added security.. :D But you know gotta get around toit... :lol:

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kiwipete
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Re: 80 series recovery hook mounting.

Postby kiwipete » Sun Aug 31, 2014 5:27 pm

Back on topic please gents. :wink:
Ok people, move along. Nothing to see here. Thank you, move along.
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Re: 80 series recovery hook mounting.

Postby wopass » Sun Aug 31, 2014 9:44 pm

on the side of the chassis just like in Big's pic

Big wrote:
Image

Cheers



front hook on my 80 is in almost the exact same spot :wink: from memory you can pick up the holes that have captured nuts :mrgreen: i just tried to take a pic but phone went flat :lol:
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Re: 80 series recovery hook mounting.

Postby churchill » Mon Sep 01, 2014 10:18 pm

Grade 8.8 M12 course thread is standard fitment so grade 5 1/2 inch is better.

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Re: 80 series recovery hook mounting.

Postby kbjj » Tue Sep 23, 2014 10:56 am

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 :shock:

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 :wink:

big motor :twisted:
big wheels :twisted:
big winch :twisted:
small hook bolts :?: :mrgreen:


:mrgreen:

hahaha ok fair comment.. :mrgreen: I did replace 1 hook bolts with 8.8 coarse thread though.. :roll: so should be adequate.. but I am going to change all of them with cap bolts as you have for the added security.. :D But you know gotta get around toit... :lol:



Mmm, with recovery hook bolts, can you be too high in tensile rating? ie too brittle, not so tough?
If you break it... build it stronger.

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Re: 80 series recovery hook mounting.

Postby johnny262 » Wed Sep 24, 2014 9:32 pm

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 :lol:
Im sure those in the the know will soon clarify that for us... :D

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Re: 80 series recovery hook mounting.

Postby Colinl » Thu Sep 25, 2014 8:35 am

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.

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Re: 80 series recovery hook mounting.

Postby Cheesy_Dave » Fri Sep 26, 2014 12:29 pm



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.

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