Slip joint and folders screws

[Andybrock]

I’ve seen a few slip joint and other similar small folders that are screwed together rather than using peened pins and wondering how this is done? is the spring tapped and threaded or do they use a threaded sleeve thru the spring so it can be screwed from both sides?

 

[Stacy E. Apelt - Bladesmith]

Usually one liner has threaded holes and the other has countersink holes. The screws go through spacers or a solid backspacer or spring.
Places like knifekits.com sell all types and sizes of screws as well as the taps needed.

 

[Andybrock]

Usually one liner has threaded holes and the other has countersink holes. The screws go through spacers or a solid backspacer or spring.
Places like knifekits.com sell all types and sizes of screws as well as the taps needed.

Thanks Stacy,
So the screws aren’t placed directly opposite each other, they’re offset on each side so they screw into the opposite liner?

 

[bjansen]

I’ve been using sexbolts (7/64) for the spring and (1/8) for the pivot. Thus, the sleeve goes all the way through both liners and spring/blade and I think is a much more secure way to do it.

 

[Stacy E. Apelt - Bladesmith]

No, they line up.
The frame screws go from one liner to the other. They are under the scales.
The screws for the scales go through the scale and the liner it is attached to.
Screws for bolsters go through the bolster and the liner it is attached to.
Pivot screws go from one side to the mating pivot half on the other.

 

[Bill DeShivs]

Screwing scales to thin liners is not very secure.
In the past, when a customer has requested screws I soldered a piece of 1/8" brass rod where the hole would be-drilling and tapping both the rod and liner. I relieved the underside of the handles to clear the piece of brass.

 

[Stacy E. Apelt - Bladesmith]

Yes, you want a screw size that would allow at least two threads in the liners. With a 2-56 screw, that would be a 1/32"/.03"/.75mm liner.

Bill's suggestion is excellent.

 

[tiguy7]

View attachment 1469621 This Ti SAK is assembled with three 1/8" diameter barrels which are internally threaded (#2x56TPI). 6 screws hold the thing together, and all the parts swing on a smooth cylinder rather than a threaded fastener. The opposing screws almost touch in the center of the barrel, so there are plenty of threads for proper anchoring.