Leif Holmberg Posted October 12, 2015 Share Posted October 12, 2015 A friend of mine are trying to "clean"the threads after chroming the vent window stantions.(Pontiac 1954 convertible)The skrews he has is 3.08 mm diameter,and 40 threads /inch,4-40 are to small and 6-40 to big.Need your help to solve this problem.Leif in Sweden. Link to comment Share on other sites More sharing options...
Restorer32 Posted October 12, 2015 Share Posted October 12, 2015 Sounds like 5-40. Major screw size would be 2.85 mm after you remove the chrome. Odd size, seldom seen. Link to comment Share on other sites More sharing options...
Leif Holmberg Posted October 12, 2015 Author Share Posted October 12, 2015 Restorer,"2.85"(2.845) are 4-40 Maybe 5-40 unc are right, 40 threads/inch they are 3.175mm, but the skrew are not new chromed and the diameter are 3.08mmLeif in Sweden. Link to comment Share on other sites More sharing options...
Restorer32 Posted October 12, 2015 Share Posted October 12, 2015 5-40 UNC is .285 mm according to my machinist's chart. Link to comment Share on other sites More sharing options...
Leif Holmberg Posted October 12, 2015 Author Share Posted October 12, 2015 Here are a list I found on internet.5-40 UNC looks close,0.1250"total diameter = 3,175 mm,really hope that will be the right ones.Leif in Sweden. Link to comment Share on other sites More sharing options...
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