Does anyone know how strong stainless steel is compared to high tensile ?
I am replacing some U bolts and the only match I can find are stainless and if they break the wheels will literally come off the wagon !
Geoff said the following on 10/04/2007 11:10:
You can get various grades of stainless steel, including high-tensile variants so you really need to contact the U bolt supplier and ask them exactly what type of stainless their product is made of.
Have a look here:
They have no idea ! The bolts have no markings on them, I assume high tensile stainless would have a 8.8 or some other marking ?
Geoff said the following on 10/04/2007 14:10:
Well, I don't think so; U bolts don't have anywhere to put the 8.8 marking, stainless or not. The 8.8 marking is usually only seen on the head of a bolt or machine screw.
Have you tried Googling? - a lot of the trailer spares companies have high tensile U-bolts.
or you could try giving these guys a call:
High-strength steel fasteners are ISO property class 8.8 or 10.9. Property class 8.8 fasteners have tensile yield strength 640 MPa and tensile ultimate strength 800 MPa, whereas property class 10.9 fasteners have tensile yield strength 940 MPa and tensile ultimate strength 1040 MPa.
Unmarked stainless steel fasteners are typically only annealed stainless steel ISO grade A2, also called UNS 30400, AISI 304, or
18-8 stainless steel. ISO 3506-1 states annealed stainless steel ISO A2 fasteners have tensile yield strength 210 MPa and tensile ultimate strength 500 MPa.So tensile yield strength of annealed stainless steel fasteners is 32.8% of property class 8.8 fasteners, and tensile ultimate (rupture) strength is 62.5% of property class 8.8 fasteners.
High-strength steel fasteners are ISO property class 8.8 or 10.9. Property class 8.8 fasteners have tensile yield strength 640 MPa and tensile ultimate strength 800 MPa, whereas property class 10.9 fasteners have tensile yield strength 940 MPa and tensile ultimate strength 1040 MPa.
Unmarked stainless steel fasteners are typically only annealed stainless steel ISO grade A2, property class 50, also called annealed UNS S30400, AISI 304, or 18-8 stainless steel. ISO 3506-1 states annealed stainless steel ISO A2-50 fasteners have tensile yield strength 210 MPa and tensile ultimate strength 500 MPa.
So tensile yield strength of annealed stainless steel fasteners is 32.8% of property class 8.8 fasteners, and tensile ultimate (rupture) strength is 62.5% of property class 8.8 fasteners.
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