Roloc? What Connection is Need for These?

[FMC1959]

I got a bag with 50 of each of these, 60 & 120 grit overlap discs. I have some Roloc holders but they have a quick turn female screw thread. Similar to what you see on this link
https://www.amazon.com/dp/B01MT3FYUV/?tag=atomicindus08-20

These need a male screw in the hold, the thread might be finer and slightly smaller screw size.

Anyone know what holder these require?

 

[bwringer]

You need a mandrel or arbor with that little screw thread in the end.

https://www.mcmaster.com/#mandrels/=17747483e4ae473cb6a10e43e78a5a47jsurhrv7

Looks like there are three different screw threads those could be. Hard to tell how big those are from your pics, but I've seen #8-32 threads and 1/4"-20 threads.

 

[Wamsutta]

Is it 1/4''-20 ? If so, they got one on eBay -
https://www.ebay.com/p/Merit-Mm20-4-Overlap-Slotted-Disc-Quick-Change-Mandrel-08834183164/1333250012

PART NUMBERS ON PAGE 179 -
https://www.nortonabrasives.com/sga...log-nortonindustrial-7362-lr-bookmarked_1.pdf

 

[FMC1959]

I tried different bolts and much to my surprise, they are 8-32 thread. After searching with part numbers I could barely make out, this is what I have in 60 & 120 grit
https://www.aaabrasives.com/standar...14815-1-1-2-x-8-32-x-2-100-grit-made-to-order

 

[Wamsutta]

8-32 you say? You got your choice of 3 different lengths.

https://www.abrasivestore.com/products/merit/p67b.php

 

[FMC1959]

8-32 you say? You got your choice of 3 different lengths.

https://www.abrasivestore.com/products/merit/p67b.php

Looks about right, thanks