TerryN68

I need a helicoil for my 68 windshield wiper cover. I'm working away from home and trying to use the time to gather up parts. For the life of me I can't remember the size of those side bolts for mounting the cover. You know the ones with the collar. Anybody know the thread size???

T :confused: :confused: :confused: :confused:

Tomi72

The paint shop broke two bolts on my viper cover when they removed it. As I couldn't find helicoils at any local shop I tried something else. I drilled out the old bolts with a slightly small drill bit and just re-tapped the holes. Surprisingly it worked ok... The thread size is 18-24UNC.

rgds Tomi

TerryN68

Tomi,

Mine is stripped there is nothing to tap. Do you think the bolt is 10-24??

18-24 don't sound right???

T :confused:

Monkeywrench

There is no such thing as a 18-24, there is a #10-24 and a 5/16-18, you should be able to differentiate easily between these two sizes (the #10 will measure approx 0.19" in diam and the 5/16 will be... you guessed it 5/16"

Tomi72

My bad, sorry! I read it from the side of the tap and what looked like 8 is actually 0. so it was 10-24 tap I used.

rgds Tomi

Monkeywrench

OK, if it's a #10-24 you'd drill out the hole to a #5 drill (which is 0.2055") for a helicoil. If your hole is larger than that you'll need to use a threaded insert (different from a helicoil) and drill the hole to 0.2570 (a "F" drill) and tap it 5/16-18. Hope that helps..

TerryN68

Thanks guys! I shoulda brought the bolt with me. I thought it was 10-24 but wanted to make sure it wasn't a fine thread 10-32. Want to get the helicoil while I'm in the big city.

T :D