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Torque value on 1/2" course thread head bolts?


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tia,  can't find my blue ribbon, the 4 hash marks on the bolt head gots me confused. (Grade 8?)

These are original ih marked head bolts for a 1960, 123 gas power unit.

thanks. 

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t4,  Out of a IH service manual. Grade 8 have 6 hash marks, grade 5 have 3 hash marks. There is a grade 7 with 5 hash marks but you don't see those very often. C123 head bolt torque is 85 lbs ft according to a post on Yesterdays Tractors.

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  • 2 weeks later...
On 8/16/2020 at 4:15 PM, t4mike said:

tia,  can't find my blue ribbon, the 4 hash marks on the bolt head gots me confused. (Grade 8?)

These are original ih marked head bolts for a 1960, 123 gas power unit.

thanks. 

Depends what application the bolts are used on also sometimes the recommended torque is not required more important to torque headbolts in stages and sequence to get even compression on the gasket

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