Force clamp screw bolt thread size?

[slimmer57]

1984 force 125 1258x4a

https://www.marineengine.com/parts/force-outboard-parts/125-hp-1984/1258x4a/motor-leg

F474073-1 - SCREW-STERN - Replaced by -FA628073​

does anyone know what size threads and bolt size this is?

 

[jerryjerry05]

I think it's: 1/2x 24
Got a Granger store or a hardware store? they can help with the size..

 

[Nordin]

I believe that one is larger.
5/8 x11 UNC or maybe 3/4 x ?.
I know that smal OMC engines (5,5Hp Evinrude 1963) has screw diameter size 5/8 and 11 threads UNC an in.
I have just restored one that missed both screw clamp.

 

[slimmer57]

I believe that one is larger.
5/8 x11 UNC or maybe 3/4 x ?.
I know that smal OMC engines (5,5Hp Evinrude 1963) has screw diameter size 5/8 and 11 threads UNC an in.
I have just restored one that missed both screw clamp.

From what I can measure is 3/4 but I don’t know the threads I had to drill it out

 

[Scott Danforth]

3/4" threads are most likely 3/4-10

 

[alldodge]

Just to make sure we're talking the same thing, a 5/8 bolt will have a 3/4 hex head

 

[Nordin]

I am talking about the bolt diameter (threads) not the head size.
Do not know the pitch of the threads but I think Scott Danforth is right.
Do not know if it is UNC or UNF, but know that earlier Chryslers had both UNC and UNF depending on year.

 

[airshot]

Thread pitch gages are cheap, most good hardware stores carry them. Just match the threads and read the pitch.

 

[Scott Danforth]

I am talking about the bolt diameter (threads) not the head size.
Do not know the pitch of the threads but I think Scott Danforth is right.
Do not know if it is UNC or UNF, but know that earlier Chryslers had both UNC and UNF depending on year.

3/4-16 is UNF. use a tape measure, measure out 1" and count threads.

 

[airshot]

3/4-16 is UNF. use a tape measure, measure out 1" and count threads.

The only issue there would be metric threads, some are so close to SAE that a scale won't work, not ckose/ accurate enough..

 

[alldodge]

The only issue there would be metric threads, some are so close to SAE that a scale won't work, not ckose/ accurate enough..

It's a Force OB, no metrics

 

[brodmann]

Go to any ACE hardware store. They'll have a thread gauge.. Bolts and nuts mounted to a board where you can screw yours in until you find the one that fits.

 

[jerryjerry05]

If you look at the pics???? You'll see there is no regular head, it's been modified to accept the handle.
Some are cut down to fit a 1/2" socket.
Also it's a fine thread, 1/2X 16 is too thick, that's why its a 24 or close to that.