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Fit & Finish Fit and Finish = the difference in "good art" and "fine art." Join in, as we discuss the fine art of finish and embellishment.

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Old 09-21-2018, 11:03 PM
Willyd57 Willyd57 is offline
Join Date: Sep 2018
Posts: 2
Cool Correct Size Corby Bolt

Hi All

I just received a TBS Bushmaster Boar knife blade that I need to put a handle on. The tang has three holes that measure 6.05mm (0.238 or 15/64 in). That is 12 thousands under 1/4". In two of the holes I would like to put Corby bolts, and a lanyard pin in the 3rd hole.

But, I'll be ####ed if I can find the correct size bolt little lone the lanyard pin.

Most Corby bolts I find are to big, having a 1/4" shaft. I find some smaller but they seem too small like 3/16" WTF!

The question is two fold really, First, is there a supplier that has what I need? and second, how small is too small? I would guess that I should only have about 3 thou "slop" in my pins.

Any help would be great!


Last edited by Willyd57; 09-21-2018 at 11:07 PM.
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Old 09-22-2018, 10:19 AM
jimmontg jimmontg is offline
Join Date: Jan 2016
Location: Now live in Las Cruces NM.
Posts: 1,272
Willyd; You might try a 1/4 loveless screw, the bolt section will be smaller than 1/4, by how much I don''t know as I use 1/8 and 3/16 loveless screws.
I don't know why you can't use a 3/16? I always use small screws, the epoxy or acraglass will fill in the slop. I've never had a failure. You can also use 3/16 tubing as well, I had some stainless I made mosaic pins from.

You can call Jephco Supply and tell them your problem as basically you have a 6mm clearance hole. Jephco makes their own screws, no made in China hardware. They're the only place I can get 1/8" loveless screws from. There is a possibility that on their 3/8 loveless bolt the bolt might be smaller than .238. Also check out their corby's as the shaft is smaller than the ends.
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Old 09-22-2018, 02:30 PM
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M&J M&J is offline
Join Date: Dec 2004
Location: So. Cal
Posts: 519
An alternate possibility would be to wrap some sand paper around a small file and open the hole up to get the bolt to clear. Diamond files are also useful in this regard. A set of budget import diamond files was like $5 file. The diamond doesn't last long on those budget ones but enough to do the job a few times to make them worthwhile.

Sometimes after a heat treat I've wanted to do other handle options, picked up some carbide drills for the fasteners I use. From $20-$40/bit and they are savers when that realization of "Oh Sheep!" hits.

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Old 09-22-2018, 05:02 PM
Willyd57 Willyd57 is offline
Join Date: Sep 2018
Posts: 2
Thanks guys for the advice it was great help. Having had a day to think about things, I believe I will go with 3/16th Corby bolts and lanyard tubing then be done with.

Thank again for the help.

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Old 09-23-2018, 02:21 AM
dtec1 dtec1 is offline
Join Date: Aug 2015
Location: ny
Posts: 1,442
I would just drill the holes in the tang up to 1/4
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