Mud-club

Vehicle & Technical => Defender => Topic started by: dogwood on September 11, 2006, 23:11:00

Title: bolts
Post by: dogwood on September 11, 2006, 23:11:00

bolts come in  sizes m6 ,m8 m10 m12 but what sizes are these what socket fits over them; to Help  me guage the size
noticed screw fix do a range of bolts nameley A2 stainless steel, A4 stainless steel and BZP high tensile any of these any good to use on a landy ( what does BZP stand for) I'm not tech minded :oops:

Title: bolts
Post by: sleeplessparadise on September 12, 2006, 07:45:43

BZP is bright zinc plated

Title: bolts
Post by: ian_s on September 12, 2006, 08:04:41

i beleive m8 is a 10mm head, m10 is a 13mm, and m12 is 17?
i might be totally wrong tho  :?

Title: bolts
Post by: johnty on September 12, 2006, 10:36:51

ian_s is not correct...perhaps he just miss quoted

m6 = 10mm head
m8 = 13mm head
m10 = 17mm head
m12 = 19mm head

To give you a rough guide as to what size would fit where they would fit on your 90

m6 ..... snorkel top mounting bracket (where it bolts the plate onto the actual snorkel)

m8 ..... door hinges

m10 .... front bumper bolts (i think they are...but i could be wrong here...they might be m8, but i doubt it) Winch mounting bolts

m12.... Roller fairlead on your winch bumper.


As to are they any good to use on a landy...hmmm well the bzp is a fairly run of the mill bolt and should be ok without anymore problems than you already get with landrovers

The stainless ones however, without getting too technical(besides which im not 100% sure how it works), there is a potential difference between stainless steel and aluminium (theres actually a difference between the normal bolts and aluminium hence the problem of the white powdery corrosion people suffer with where steel and aluminium meet...think discovery door bottoms etc).

The difference is greater with stainless as it is with a more general steel, and, what happens is the two different metals sort of create themselves into a battery of sorts and due to a flow of electrons or something you get the corrosion.

Basically if you want to use stainless bolts to hold aluminium together you need to try and insulate the stainless from the aluminium.

Title: bolts
Post by: dogwood on September 12, 2006, 14:06:00

cheers guys forgot all about the metal electrolysis bit

Title: bolts
Post by: V8MoneyPit on September 12, 2006, 17:43:08

Also, realistically priced stainless steel bolts tend to be of a lower grade than you might need for structural use. So don't! Fine for non critical parts, but don't use them on anything that you might consider safety critical.

On BZP steel fixings, the zinc plate is there as a sacrificial element to stop the structural component underneath it corroding.

Title: bolts
Post by: ian_s on September 12, 2006, 17:58:31

Quote from: "johnty"

ian_s is not correct...perhaps he just miss quoted

heh OOPS. only one step out.

Title: bolts
Post by: Guardian. on September 12, 2006, 18:18:28

carefull if you are thinking of buying cheap bolts, some cheapies shear to easily, as so stainless. bzp is just the finish, as the man said zinc plate, but ordinary black or self finish are ok. the most important aspect is the tensile, if the bolt has no numbers on its head throw them away, it should have 8.8 on it, some have a smaller figure that are not as tensile or shear quicker.stick to 8.8 and you shouldnt have any problems.

Title: bolts
Post by: sleeplessparadise on September 12, 2006, 18:32:15

Quote from: "guardian off road product"

. bzp is just the finish, as the man said zinc plate, but ordinary black or self finish are ok. .

Hey I'm a girl :shock: Ok well I am a woman really but still........definately not a man last time I looked :lol:

Title: bolts
Post by: Guardian. on September 12, 2006, 20:12:22

oops!   sorry helen. one of my own customers as well!

Title: bolts
Post by: sleeplessparadise on September 12, 2006, 20:24:55

:(biggrin): You are forgiven just this once Spence :wink: