• Hey Guest!
    British Car Forum has been supporting enthusiasts for over 25 years by providing a great place to share our love for British cars. You can support our efforts by upgrading your membership for less than the dues of most car clubs. There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Upgraded members don't see this banner, nor will you see the Google ads that appear on the site.)
Tips
Tips

Driveline bolt hardness?

Share this page

TRGRR

TRGRR

Freshman Member
Offline
Hello all,
I'm reassembling my 76 TR6 driveline and I am planning to use grade 8 bolts but I can't remember what the conventional wisdom is on bolt hardness. I remember reading a post about it a while back where shear strength and hardness were discussed but I don't remember what the outcome was. Any suggestions?
Thanks, Tim
 
8's are fine.
 
If you are talking about the bolts that hold the various drive flanges together, I would suggest buying the proper bolts from TRF or Moss. Both the thread length and the grip length are important here, and a stock bolt is unlikely to be correct in both dimensions.

FWIW, I prefer to use what MMC calls "conical top, distorted thread" lock nuts. When I used Nylocs, even with new ones every time, they tended to come loose over time.
https://www.mcmaster.com/#hex-locknuts/=ce4c6y
 
Randall is correct. Commercial grade 8(hardware store) bolts are very brittle and can break.

Jim
 
I buy a lot of my hardware from Aircraft Spruce or ARP.
Any grip lengths and size you can imagine.
 
Thanks all,
I broke down and ordered the bolts from Moss. Scott, I did check out Aircraft Spruce and will be ordering hardware from them in the future. Thanks for your help.
 
Back
Top