C1 water pump bolts

[Michael Lander (44237)]

Use grade 5 or 8 on water pump bolts?

[Joe Ciaravino (32899)]

Re: C1 water pump bolts

Mike,

Are you looking for the "correct" head markings? If not, then any grade 5 bolt will more than suffice. Grade 8 is overkill for that application.

Joe

[Michael Lander (44237)]

Re: C1 water pump bolts

Thanks Joe, just a driver, so markings are not critical.

Mike

[Joe Lucia (12484)]

Re: C1 water pump bolts

Mike-----

As Joe mentions, you don't need grade 8 bolts for this application. The original installation used bolts of SAE grade 5 (GM 280-M). However, in most hardware stores there is not a great difference in price between Grade 5 and Grade 8. So, assuming that the particular hardware store you use follows this pattern and assuming that they actually carry grade 8, I would purchase grade 8.

For my hardware store fastner acquisitions, either for a specific purpose or just for my fastner bins stock, I virtually always purchase grade 8. In this manner, the fastners are "multi-purpose"-----I can use them for just about any application.

The only downside to grade 8 over grade 5 is price and, as I say, the price difference is usually not all that great.

[Bernard Myers (25115)]

Re: C1 water pump bolts

Mike, The only thing I might add is that you should definitely use grade 8 when attaching the fan to the pump.