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


No MarkingsGrade 2

Low or medium carbon steel

1/4 thru 3/455,00057,00074,000Over 3/4 thru 1-1/233,00036,00060,000
3 Radial LinesGrade 5

Medium Carbon Steel, Quenched and Tempered


thru 185,00092,000120,000Over 1 thru 1-1/274,00081,000105,000
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








8.8Class 8.8

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




16mm - 72mm 600660830
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.