Could anyone tell me what BZP stands for in terms of nuts and bolts? Screwfix has listed theirs as BZP. I'm trying to find some weldable nuts.

Edit: Think i've found it, bright zinc plate.

Bright Zinc Plated

Edit: Dont know why I bother.

Edit 2:what nuts are you welding and why,plain steel ones will do.

I'll be welding the ones for the roll bar mount and the seatbelt anchors, it says to do it in the book, and i'm guessing its because it would be a right bitch taking the roll bar off and having to get a socket in there when the shock and all of the bodywork is in place.

You bother because your a kind fellow and it is much appreciated :D :p

Another question, when nuts are referred to as A2 or A4, is this the grade of stainless steel used?

Finally what is the difference between type p and type t nuts?

Seat belt anchors yes,I personally would locknut,washer and bolt the roll bar.
If you misplace the nuts when welding it will be a pain to rectify later.
No thanks needed Simon we have loads to spare.

Stainless is brittle and not easy to weld to steel.

stainless bolts.
 

Easy to find stainless bolts usually A2-70 7.0 harder to find A4- 80 8.0 neither rearly strong enough for stress points. Roll bars i would use somthing about 12.0

AFAIK A2 means usual stainless steel for fasteners (AISI 304 for fabrication steel) and A4 (AISI 316 for fabrication steel) acid proof stainless.

Madis

Whats wrong with welding the roll bar in place? It appears that that roll bar stays are welded to te rear frame. Is that correct?

When welding carbon steel to s/s the joint will be prone to rust. Making the s/s pointless.

I havent got my book with me at the moment, I know that the uprights are welded to the roll bar, but I dont think they are welded to the rear section. Correct me if im wrong though :p.