Stainless steel bolt suppliers?

[barwel1992]

im wanting some stainless steel bolts for my callipers (brembo's) they are the bolts that hold the two half's together

does any one have a good site that supplies SS bolts various length's and shank lengths that dont cost the earth unlike pro bolt


thanks

[Airwolf]

what about chewys

http://www.chewys-stuff.co.uk/

[DarrenSV650S]

This site is brilliant. Great service
http://www.stagonset.co.uk/

[dyzio]

Pro Bolt (http://www.tastynuts.com/Products/Aprilia_RSV_Milie_98_02)

[barwel1992]

LOL pro bolt want £22 for 8 bolts

[dyzio]

Well, you wanted shiny :D

I may need to change mine as well, let us know what you get.

Cheers

[ty_uk]

WE have loads of diff ss bolts in work, tell me what sort & how many..postage cost will do?

[barwel1992]

Well, you wanted shiny :D

I may need to change mine as well, let us know what you get.

Cheers

the bolts im on about are the 4 per calliper that hold the 2 halves together

[dyzio]

Yep, we have the same callipers.

[barwel1992]

WE have loads of diff ss bolts in work, tell me what sort & how many..postage cost will do?

cool,

i would need 8 bolts

m8 cap head x 40mm x 25mm - 1.25 pitch i think

tada lol epic paint skills
http://i357.photobucket.com/albums/oo16/barwell1992/brembobolt.jpg

thanks

PS the head (5mm part) could be slightly longer as it doesn't mater that much but would be good if you had thin head bolts

[husky03]

be needing these for the curvy rears-i can send you one so you can get size then i'll be needing atleast a dozen to be starting with.

[barwel1992]

found the exact ones on pro bolt, the first bolt on the list

http://www.tastynuts.com/Products/stainless_steel_Other_Parts-kits

£27 is a joke when the normal ones are £22 these just have a small head

[ty_uk]

Will check our stock in the morning & get back to you

[Bibio]

knock yerself out...

http://www.aruncas.com/acatalog/index.html

[barwel1992]

Will check our stock in the morning & get back to you

cool thanks very much ps dyzio might want some as well

[ty_uk]

No problem

[thefallenangel]

http://www.smilelocal.com/engineering_supplies_and_equipment/warwickshire


that avon one looks like what you want.

[fastdruid]

Please make sure you get decent bolts, stainless is not the same 'strength' as steel and brakes are not worth ****ing about with for the sake of shiny. One of the reason 'pro bolt' ones are so pricey and the ones on ebay so cheap.
A4 grade at minimum.

Druid

[timwilky]

http://www.hyperbolt.com/hyperbolt/product-detail.php?passed_product_recno=5510

31 pence each

[philbut]

This site is brilliant. Great service
http://www.stagonset.co.uk/

Thats my mate stu owns that.

[fastdruid]

http://www.hyperbolt.com/hyperbolt/product-detail.php?passed_product_recno=5510

31 pence each

A2 grade, I wouldn't use them on brakes.

Druid

[timwilky]

The A2 or A4 debate

My understanding is for automotive if you must use stainless, use A2. A4 has better resistance to corrosion by using more Chromium, but in turn makes it more brittle than an A2 and as such is more likely to stress fracture. Therefore A2 for brakes, not A4

[fastdruid]

See http://www.algeo.com/~joe/KIAT/kiat_2.htm A2 has less strength and has higher friction so your clamping force is lower for a given torque.

Metric Class Marks on Head Material Tensile Strength Yield Strength
N/mm2 psi N/mm2 psi
8.8 8.8 Steel 800 116,000 640 93,000
10.9 10.9 Steel 1040 151,000 940 136,000
12.9 12.9 Alloy Steel 1220 177,000 1100 160,000
A2-70 A2-70 302 Stainless 700 102,000 450 65,000
A4-80 A4-80 316 Stainless 800 116,000 600 87,000

Druid

[timwilky]

Druid

you are only looking at the tensile and yield strength, so yes an A4 is a stronger fastener, however you are not looking at the underlying metallurgy. An A4 is also far more brittle than an A2. So where used in dynamic or high stress environments it is far more prone to fracture. A brake caliper is such a stress area, every time the brakes are applied the clamp bolts are put under added load by the two halves trying to force themselves apart.

It is a very long time since I worked as an automotive engineer. But the thinking back then as definitely never to use stainless as regardless of corrosion characteristics they just do not perform as well as high tensile bolt.

[fastdruid]

I agree but an A2 has a yield strength 70% of plain 8.8, and that assumes 'only' using 8.8 bolts in calipers[1]. Assuming a 2* safety margin you should still be OK but rather close to the wire. That plus your torque figures are out because of using a different material.

I personally stick to OEM bolts for brakes, just not worth it for shiny[2] IMO.

Druid

[1] I don't know about Suzuki but Honda use sacrificial one-use bolts that stretch as you tighten them.
[2] In the past I've just stuck the bolts in the drill and cleaned them up with emery paper followed by some lacquer to keep them shiny.

[AndyBrad]

I use a4 and a2 everyday in pressure applications. The only reason i would use a2 would be cost and availability. That isnt an issue in this case. While i understand your reasoning behind having a "less brittle" part surely is you were approaching this as a reason for failure you would be needing significantly higher tensile bolts or material?

[barwel1992]

caliper mount bolts are SS one from pro bolt, they are A4 grade and that would be the grade i would buy

[madmartyn]

i would not put stainless bolts anywhere near my brakes and we get lots of customers in asking for bolts for their brakes i always stear them away from it, mush better going for a nice plated (as long as its been de-embrittled after) socket cap(12.9 as standard) or socket button(10.9 as standard) safety first over looks