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Are 4 bolts enough to hold on a winch bar?

General Tech Talk

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Emo
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Are 4 bolts enough to hold on a winch bar?

Post by Emo »

or am I mising something? I bought a second hand winch bar from eBay and it has two horizontal holes on each side to bolt to the chassis rails.
Is this enough? Seems like it should have more somehow.
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Post by Surfin Alec »

My 80 series ARB bar has 4 bolts for the winch and 6 bolts per side for the chassis attachment. 2 under the chassis, 2 on the side and 2 on top of the chassis.
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Post by toughnut »

Yeah 4 bolts are enough to hold on the bar :D Just don't try and winch with it ;) Sounds like they haven't drilled out all the holes. I'd have at least 2 more bolts for peace of mind. I've run my comp truck with only 6 bolts with no probs but I'd feel uncomfortable with only 4. :roll:
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Emo
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Post by Emo »

Surfin Alec wrote:My 80 series ARB bar has 4 bolts for the winch and 6 bolts per side for the chassis attachment. 2 under the chassis, 2 on the side and 2 on top of the chassis.
That's what I thought a winch bar should have.

I might have to look and see if I can drill some more and / or get some extra brackets welded onto the bar.
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Post by Reddo »

you could always send it back.....
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Emo
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Post by Emo »

Reddo wrote:you could always send it back.....
Nah, I only paid $80 for it. I'll get some extra brackets welded onto the bar so it can bolt through the top and bottom of the chassis rail as well I thinh.
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Post by Loanrangie »

Emo wrote:
Reddo wrote:you could always send it back.....
Nah, I only paid $80 for it. I'll get some extra brackets welded onto the bar so it can bolt through the top and bottom of the chassis rail as well I thinh.
If there isnt holes already you will need to add crush tubes to the extra bolt holes.
Saddle up tonto, its the not so loanrangie! . 98 TDI DISCO lightly modded with more to come.
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Post by ISUZUROVER »

How big are the bolts??? A 12mm Class 8.8 bolt has a Tensile strength of about 15 tonnes, and about 10 tonnes in shear.
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Post by N*A*M »

ISUZUROVER wrote:How big are the bolts??? A 12mm Class 8.8 bolt has a Tensile strength of about 15 tonnes, and about 10 tonnes in shear.
michelle managed to sheer 2 of these in one go. they were 2 days old with nordlock washers too. i would beef up your mounting system.
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Emo
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Post by Emo »

From having a chat with HSV Rangie who is a structual engineer, 4 x class 8.8 bolts with hardened flat ground washer to inside of chassy rail and nyloc nuts of same grade or higher will be fine.
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Post by bazzle »

Emo wrote:From having a chat with HSV Rangie who is a structual engineer, 4 x class 8.8 bolts with hardened flat ground washer to inside of chassy rail and nyloc nuts of same grade or higher will be fine.
1 bolt is fine too it just depends on what size it is, what way it is stressed etc.
10mm is 33.7 kN proof and 46.5kN breaking load for a new bolt.

Of course if it is mounted so it flexes angularly ie, chassis bends, loads must be lower.

Bazzle
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Emo
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Post by Emo »

bazzle wrote:
Emo wrote:From having a chat with HSV Rangie who is a structual engineer, 4 x class 8.8 bolts with hardened flat ground washer to inside of chassy rail and nyloc nuts of same grade or higher will be fine.
1 bolt is fine too it just depends on what size it is, what way it is stressed etc.
10mm is 33.7 kN proof and 46.5kN breaking load for a new bolt.

Of course if it is mounted so it flexes angularly ie, chassis bends, loads must be lower.

Bazzle
The 4 bolts will be 12mm.
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