Front Diff Mounting Bolt

[drmiles]

Ok I broke the bolt that holds the front Diff to the cross member does anyone have the exploded view so I can make sure I put all the washers and spacers back in the right place.

2007 H2

jerry

[twr]

hi this is for a 2008 h2 ,but i think a 2007 is the same. The torque for the rubber mount bolt is 63ft. lbs. Hope this helps

[drmiles]

Yep thats the bolt. I think I have all the washers. I put a grade 2 bolt in it for now. Need to get Grade 1 I think.

[drmiles]

Makes a damn awful clunking noise without that bolt.

[twr]

hi drmiles, i bet it does, the diff can move alot without the bolt, i had mine apart but i don't remember the grade of the bolt. It may be best to get it from the hummer dealer.

[drmiles]

Thanks, you don't have the part number as well?

[twr]

hi sorry no i don't

[drmiles]

Cool I'll bet the parts dept will
Thanks a lot

Jerry

[twr]

Hi Jerry, your welcome. They will have the # just call them to see if its in stock.

[HumminNBoatin']

Should be able to pick it up from a hardware store. Its just a Metric grade 10.9 bolt with a flange nut head.

[drmiles]

I Put a Grade 2 Bolt From tractor Supply. Bolt Say HKT on Top Not Sure if it is strong Enough.

[drmiles]

Found this Guess I Need a Stronger Bolt!!





Bolt Grade Markings and Strength Chart

Head Marking Grade and
MaterialNominal Size Range
(inches)Mechanical Properties Proof Load
(psi)Min. Yield Strength
(psi)Min. Tensile Strength
(psi)US Bolts (http://www.boltdepot.com/hex-bolts.aspx)

http://www.boltdepot.com/Images/charts/hex-head-marking-grade2.gif
No MarkingsGrade 2

Low or medium carbon steel

1/4 thru 3/455,00057,00074,000Over 3/4 thru 1-1/233,00036,00060,000http://www.boltdepot.com/Images/charts/hex-head-marking-grade5.gif
3 Radial LinesGrade 5

Medium Carbon Steel, Quenched and Tempered


thru 185,00092,000120,000Over 1 thru 1-1/274,00081,000105,000http://www.boltdepot.com/Images/charts/hex-head-marking-grade8.gif
6 Radial LinesGrade 8

Medium Carbon Alloy Steel, Quenched and Tempered
1/4 thru 1-1/2120,000130,000150,000Stainless markings vary. Most stainless is non-magnetic18-8 Stainless

Steel alloy with 17-19% Chromium and 8-13% Nickel
1/4 thru 5/8 40,000 Min. 80,000 – 90,000 Typical100,000 – 125,000 Typical3/4 thru 1 40,000 Min. 45,000 – 70,000 Typical100,000 TypicalAbove 1 80,000 – 90,000 TypicalHead MarkingClass and
MaterialNominal Size Range
(mm)Mechanical Properties Proof Load
(MPa)Min. Yield Strength
(MPa)Min. Tensile Strength
(MPa)Metric bolts (http://www.boltdepot.com/metric-hex-bolts.aspx)







http://www.boltdepot.com/Images/charts/hex-head-marking-class8-8.gif
8.8Class 8.8

Medium Carbon Steel, Quenched and Tempered
All Sizes below 16mm580640
800




16mm - 72mm 600660830http://www.boltdepot.com/Images/charts/hex-head-marking-class10-9.gif
10.9Class 10.9

Alloy Steel, Quenched and Tempered
5mm - 100mm830940
1040

12.9Class 12.9

Alloy Steel, Quenched and Tempered
1.6mm - 100mm9701100
1220
Stainless markings vary. Most stainless is non-magnetic.
Usually stamped A-2
A-2 Stainless

Steel alloy with 17- 19% Chromium and 8-13% Nickel
All Sizes thru 20mm 210 Min.
450 Typical
500 Min.
700 Typical
Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing.
Yield Strength: The maximum load at which a material exhibits a specific permanent deformation
Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set.
1MPa = 1N/mm2 = 145 pounds/inch2

[twr]

Hi that bolt you are using is not good enough. Get a better bolt from the bolt supplier or go to the dealer and get the right bolt. That bolt also has a lock nut on it.

[drmiles]

found a Grade 8 bolt. Seems to be the same as 10.9 if my mpa to psi calculations or correct.