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Alpine Door Hinge Screws

Discussion in '"Stock" Alpine' started by tylerite3124, Aug 20, 2020.

  1. tylerite3124

    tylerite3124 Platinum Level Sponsor

    Can someone tell me the size of the Alpine door hinge screws? Thanks for any help!

  2. Gary T

    Gary T Gold Level Sponsor

    Thread size is 5/16-24 fine thread (NF National Fine)
  3. tylerite3124

    tylerite3124 Platinum Level Sponsor

    Thanks Gary, I appreciate it. Do you know the length?

  4. DanR

    DanR Diamond Level Sponsor

    Rick, They are longer than necessary to secure the doors. The additional length allows the ends that protrude beyond the plate to rust and then they are very difficult to remove.

    I'd say 5/8" of threads with total length of 3/4" is more than enough to adequately secure the doors.

    I just went out to the garage and found one..... will send you some PIC's via my phone
    Last edited: Aug 20, 2020
  5. tylerite3124

    tylerite3124 Platinum Level Sponsor

    Thanks, Dan

  6. Tim R

    Tim R Silver Level Sponsor

    Sometimes people replace the hinge screws with ones that have an Allan Key style socket at the head. I would advise against using these as they seem to quickly go from having a nice sharp hexagonal hole in to having a round hole and then they are extremely difficult to get out!

    Tim R
  7. DanR

    DanR Diamond Level Sponsor

    Here are the PIC's of the Door/Hinge screws.

    1st PIC shows the screw and a guage I use to identify for thread and size purposes.

    The head is round with angled shoulders and the threads are 5/8" in length. It has what I refer to as a Phillips head.

    2nd PIC I placed the screw head in the "slot" of the guage to show the taper.

    3rd PIC depicts the screw in the 5/16" hole. The threads are 24tpi fine as Gary T stated.

    Attached Files:

  8. tylerite3124

    tylerite3124 Platinum Level Sponsor

    Thanks Dan. Much appreciated.
  9. Tom H

    Tom H Platinum Level Sponsor

    Interesting comment, with useful info about rusting. But I think the extra length is to help install the screws. It's difficult to get the hinge plate lined up and flat enough against the surface to get the screw in. Maybe use a long screw for just the first one in each hinge plate and then replace it with the shorter length after the other screws are in

  10. 260Alpine

    260Alpine Silver Level Sponsor

  11. studmobile

    studmobile Diamond Level Sponsor

    One thing that helps greatly with screw removal is the "Screw Buster" from Eastwood. Attaches to an air hammer, and cost is only 20 bucks. Makes removal of even rusted screws possible. Wish I'd known about it sooner. David
    Wayne67vert likes this.
  12. DanR

    DanR Diamond Level Sponsor

    Tom, I found the same thing with the extra length on the bolts that are used on the control arms where they are secured to the crossmember. The additional length (the portion of the bolt) of threads was rusted badly when I was disassembling a crossmember for restoration. Stripped several of the bolts and broke a couple requiring some drilling, tapping and rethreading.

    I realize they had been in place for about 50 years, serving there purpose well, but I utilized new harden bolts as replacements that were of a shorter length where only a few threads extended for rust to gather during the next 50 years:)
  13. jack Bacon

    jack Bacon Gold Level Sponsor

    Available from Sunbeam Specialties
  14. DanR

    DanR Diamond Level Sponsor

    You are correct Jack.... I forgot to mention a good source.
  15. 62SNBMR

    62SNBMR Platinum Level Sponsor

    Has anyone ever had the nut that this screw goes into fall out? On my passenger side door, the right side bottom nut fell out. Trying to figure how in the wide, wide world of sports I get this nut back in. There is only a very small opening.
  16. DanR

    DanR Diamond Level Sponsor

    Which "Nut" ? Got a PIC? Or maybe a part number?
  17. Tom H

    Tom H Platinum Level Sponsor

    Dan, It's been a while since I messed with the door hinges. But what do the mounting screws thread into on the body? Is it a thick plate with threaded holes on the back side? Or is it nuts welded onto the back side ?

  18. DanR

    DanR Diamond Level Sponsor

    It is a thick plate with threaded holes. The plate is secured by slots/bent tabs to retain the plate but allows it to move slightly for alignment.
  19. Wayne67vert

    Wayne67vert Silver Level Sponsor

    10 years ago I made a pair of these from old screw drivers. One phillips and one flat blade. I should have got a patent. LOL
  20. 62SNBMR

    62SNBMR Platinum Level Sponsor

    I've attached a picture looking through the speaker opening on my Series II passenger side. You can see what appears to be a channel containing the two nuts for the left side of the hinge (as you look at the hinge with the door open). The other channel/two nuts are behind the fender well. There is a very small opening (where the nut fell out). I don't see any way to get it back in.

    Attached Files:

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