[TR] Bolt Grade

[Alex]

Hi All,

Quick question on grading a British Bolt.

Need to know the US equivalent of a British bolt off of a London bus
restoration in progress. The bolt is off the drive shaft.

On the head of the bolt it reads: Richards S5060. A friend wants to replace
this bolt with a US equivalent and wants to make sure he has the right grade
bolt. He states that the bolt is a 7/16 x 20.

Any help is greatly appreciated.

Alex Manzo
59 TR3A
72 TR6