80 series recovery hook mounting.

[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.

[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

[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

[4WDbits]

bolt straight on
http://www.4wdbits.co.nz/ProductDetails.aspx?productID=4688

[Big]

bolt straight on
http://www.4wdbits.co.nz/ProductDetails.aspx?productID=4688

For $25 I did this


Cheers

[skid]

[skid]

just shot outside and took a couple of pics for ya.
apologies if they are bright, the flash was rather close

[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.

[wopass]

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

[Batfastard]

Your right on the money there uncle woopas

[wopass]

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...

[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.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

[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.

[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.

[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

[Big]

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

[lax2wlg]

brain now hurts

Solution = Beer

[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

[Big]

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...

[kiwipete]

Back on topic please gents.

[wopass]

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

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

[churchill]

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

[kbjj]

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?

[johnny262]

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...

[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.

[Cheesy_Dave]

bolt straight on
http://www.4wdbits.co.nz/ProductDetails.aspx?productID=4688

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.