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I am in the middle of a spring swap and found my spring perch and shackle bolts are all grade 5. I thought this a little odd expecting grade 8 all around. Is this stock or did a PO save $2.50 on a previous swap?
Me personally, I like Cessna wing bolts, they don’t rust. But not everyone has a bucket full of 9/16x4-1/2” bolts picked up in surplus for a $1 per pound
The bus I ride is so short it is a yellow Smart Car full of squirrels, monkeys and clowns.
There are 2 major differences between new Wranglers and FSJs. FSJs are meant to be both utilitarian and capable, not just capable. FSJs are also rarely initially recognized as Jeeps by the average American.
The OEM bolts should have a grade marking on the cap. McMaster-Carr has a guide to these marks if needed. I don't think there's any need to exceed what Jeep used.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
Actually, mounted in shear a Grade 5 is adequate and arguably superior. While a Grade 8 has a higher tensile strength ( in tension, or pulling along the length of the bolt) it is also less flexible and possibly more likely to fail when the load is applied sideways (shear). Grade 8 bolts were generally used where a high clamp load is required such as ring gear, flywheel or sometimes head bolts.