[Jacques Reed]

Hi Lionel,

Just had a look at my Machinery's Handbook.
From American Standard Wrench Openings (ASA B18.2 1960):

Minimum AF opening for a 1-1/2" wrench is 1.508" and maximum opening is 1.520"

Checked Whitworth sizes and according to a newer standard BS 1083 the nearest bolt head sizes AF for BSW/BSF is 1.46 to 1.480 which is a little bit less than yours. An older standard BS 190 has the identical AF sizes. Next size up is too big in both cases.

Based on the above a 1-1/2" AF should be OK. This assumes the Chinese tool makers comply to American Standards.
Six point flank drive impact sockets also compensate for rounded corners which may be a consideration over a standard 12 point socket.
Another possibility is using a 38mm metric socket. 1.502" = 38.15 mm. If the wrench clearance is adequate it might fit but would be best to measure the Distance AF on the socket before buying. As I mentioned in an old post a 28 mm deep impact socket works great on the imperial 7/8 BSF wheel stud nuts on CMP two piece rims. So sometimes metric sizes comes to the rescue even with imperial fasteners.
It might be a lot cheaper and easier to find a metric socket too.

Hope this helps.