Indeed it is!
1/4"" Whit 20TPI into the alloy, BSCy 26TPI at the nut end.
In the literature section of this forum you will find a nut and bolt chart, search for the part number of the stud, bolt or nut and there is a good chance that most common fastening thread specs are listed.
Thanks to Musky for posting the link.
Cheers.
Swarfy.