Try A2A4, they sell some A4 80 bolts.
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Thread: A4 strength
08-05-12, 07:27 #11
08-05-12, 07:36 #12Registered User
Location : Solent
- Join Date
- Apr 2007
08-05-12, 08:05 #13
I looked through my nuts and bolts collection on board, bought in a variety of chandleries between Holland and Greece. I was quite surprised to find many A2 and A4 -70 grades and even some A2-80 nuts. I had some good quality countersunk Allen bolts which were also labelled A2-70. The convention seems to be that the lowest grade is simply marked with the composition, higher grades with the strength. My collection suggests it is not difficult to find the higher grades.
08-05-12, 08:28 #14
08-05-12, 08:55 #15
Just spoken to Sea-Screw, and their A4 bolts are property class 70. He agrees with what has been said here that my broken bolt, being unmarked, will be a 50. He also said that buying an A4 class 80 carriage bolt off the shelf would probably be impossible anywhere and would have to be specially made if anyone wanted them.Andersen 22. The best winch never made.
08-05-12, 08:58 #16
08-05-12, 09:10 #17Andersen 22. The best winch never made.