Re: Bolt on wheel lug nut torque specs
Posted: Sun Jul 08, 2018 1:01 pm
Craven wrote:I think the speculation that someone has had purpose made studs ( see pic ) to a different lower steel grade is taking thing just too far. With the cost regime of Lotus at the time they specified and had fitted to a bought in mass produced item a different grade stud is risible.
Past unknown history of stress undergone by these studs even in normal roadside spare wheel change, is more than likely a reason for breakage later in its service life.
I dont know what grade the wheel studs were originally made to do you ? i would be surprised if they were Grade 8. They appear softer to me than a typical modern Grade 8 stud. Maybe i should do some hardness and tensile testing on one
cheers
Rohan