TTY Bolt Alternative

[tmv]

Originally Posted by TiAgX5

Welding the nuts is not a good idea. The threads on both the bolts AND nuts are subjected to deformation on a TTY fastener set. You will need to replace those nuts each time the stiffener plate is removed.

You missed the part when he say he bought (I assume replaced with regular, not TTY type) them from McMaster Carr.

[TiAgX5]

Originally Posted by tmv

You missed the part when he say he bought (I assume replaced with regular, not TTY type) them from McMaster Carr.

I would not replace these with anything but the fastener specified by BMW. A different grade bolt will not deform the same as the OE bolt, what would the correct torque be for the new fastener?

[Turbo_Bimmer]

Originally Posted by TiAgX5

I would not replace these with anything but the fastener specified by BMW. A different grade bolt will not deform the same as the OE bolt, what would the correct torque be for the new fastener?

For the torque, I use what is listed for that size/grade of bolt. Many charts float around on inet. I don't really think a TTY is mandatory for that part, but I may be wrong. Sometimes TTY are used to deal with vibration, movement instead of lock washers or lock nuts.

Edit: ...and yes, I used non-strech bolts and new nuts (high grade)