MetalworkingFun Forum

I need two metric set screws. M4-0.75 x 10mm
No luck finding any in the 0.75mm pitch.

Oddly enough, my tap & die set came equipped with that size though.
Any ideas where I might find some of these screws?

Serves me right for buying tools made in France I suppose.

Willie,

No clue on the screws but believe it or not, M4 x .75 dies are available. Just run some M4 x .7 screws through one. The difference in pitch is only about 2 TPI.

Tom

Intentional cross threading?

Well, for 70 cents worth of screws I suppose I wouldn't have much to lose. I'll give it a try. Thanks Tom.

Failing that I think I might drill and re-tap to M5-0.8 rather than spend days/weeks looking for the correct screws. I would have liked to keep things original though.

Willie - what drive method (slot or hex)? I can send you some.

Funny that when I looked at the available metric thread pitches on my lathe I found that I can single point a 0.75 thread but no setting for 0.70mm

Have you checked ACE hardware? In my area they have a large selection of them.

Bob

(02-03-2014, 06:19 AM)Mayhem Wrote: [ -> ]Willie - what drive method (slot or hex)? I can send you some.

Thanks Darren, but there is no going back now.

Original slotted screws on top, the right one missing half of the 'head'.
I picked up a couple of 0.7 pitch screws this morning and tried running one through my 0.75 die. (Bottom center.) Major fail. All it did was roll over the crests of the original threads and then began to tear them out.



So I went to plan "B" and drilled & tapped the housing to M5-0.8 instead. The hex drive screws work sooooo much better since the heads don't spread apart when you twist on them.

Good to see you got it fixed Willie. That sure is a strange thread. The closest I could find was a 4.5mm x .75 thread.

Ed

I've never seen that size on any metric thread chart before. I notice the gauge is made in France though so maybe not a surprise!

(02-03-2014, 05:07 PM)EdK Wrote: [ -> ]That sure is a strange thread.

Ed

The problem with "standards" is - there are too many of them!