Multifix A clamp screws

This topic has 11 replies, 7 voices, and was last updated 24 September 2023 at 21:15 by Mark Rand.

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24 September 2023 at 17:51 #661327
YouraT
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@yourat
Hi all.

Does anyone know what the clamp screw type on real Multifix size A tool holders is?

As best as I can tell, they are M7x1, can anyone confirm?

Also, if this is the case, where on earth can I but three square headed clamp screws for one…? Even the Swiss seem to be out of stock…

Thanks!
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24 September 2023 at 17:51 #21098
YouraT
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@yourat
24 September 2023 at 18:06 #661328
DC31k
Participant
@dc31k
See:

Square head screw M7x1x22 for system size A
24 September 2023 at 18:07 #661329
Baz
Participant
@baz89810
The ones on my genuine Multifix are M7x1, don’t know where you buy screws but Tracy Tools will sell you a tap and die if you need one.
24 September 2023 at 18:20 #661333
YouraT
Participant
@yourat
Posted by DC31k on 24/09/2023 18:06:22:

See:

Square head screw M7x1x22 for system size A

Oh – thanks – useful!

€9 for three screws – €31 shipping from Germany though <arghhhh>
24 September 2023 at 18:20 #661334
Nigel Graham 2
Participant
@nigelgraham2
The Tracy Tools chart that lives by my PC, tells us M7 X 1 is a standard ISO-Metric Coarse thread.
24 September 2023 at 18:25 #661336
YouraT
Participant
@yourat
Posted by Nigel Graham 2 on 24/09/2023 18:20:56:

The Tracy Tools chart that lives by my PC, tells us M7 X 1 is a standard ISO-Metric Coarse thread.

Yes, and that's fine generally – I can buy some hex head or cap head bolts no problem, just wanted the square head on this occasion – I'll perhaps have to make some this time!
24 September 2023 at 18:27 #661337
Fulmen
Participant
@fulmen
My knockoffs are M7x1 as well. I believe it's a "2nd choice" thread, you won't find anything other than 1st choice in normal supply.

Mine are fairly soft, I suspect it's done to prevent people from stripping the threads on the holder. I've worn out several, but they're easy enough to make.
24 September 2023 at 18:29 #661338
YouraT
Participant
@yourat
Posted by Fulmen on 24/09/2023 18:27:51:

Mine are fairly soft, I suspect it's done to prevent people from stripping the threads on the holder. I've worn out several, but they're easy enough to make.

Yes, that makes sense – I think I'll be making some given the shipping cost from PeWe.
24 September 2023 at 18:53 #661343
Fulmen
Participant
@fulmen
Don't forget to turn it down a bit on the end. The screw tip tend to deform when over-tightening, this is probably what causes them to bind and strip in the end.
24 September 2023 at 19:56 #661351
David Lindquist
Participant
@davidlindquist71920
The screws on my "A" series holders from SRW Amestra are M7x1 also. I bought an M7x1 die to make my own screws using 5/16 inch square 12L14 (a leaded steel here in the US). This was made easier by the fact that I already had a 5/16 inch square 5C collet. The 5/16 inch square is very close in size to the heads on the original screws; the Tee-handle wrench fits fine.

Depending on the size of the tool I find the stock screws are sometimes a bit long and like to make shorter ones in these cases.

David
24 September 2023 at 21:15 #661368
Mark Rand
Participant
@markrand96270
Same thread as peugeot 405 brake caliper bleed screws. Don't ask me how I foud out .

I have some spares from PeWe because I ordered them when I needed a few new toolholders to replace some of the 1952 originals…
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