Metric Micro Screw

[NV_Dmax]

I measured this with calipers and got M1.75x.40-4mm (oal, not threaded section).
The head diameter is 2.43mm on the outside. It is a torx drive.

Does anyone recognize what kind of screw this would be called or where to find one that’s 5 or 6mm long? I have worn out my welcome on google and can’t seem to find anything like it.

 

[Doug Beach]

I don’t know if you require that head type, but here are some M1.8x.35 screws. Screw diameters are usually under nominal, and .35 is pretty close to .4.
Screws, Metric, M1.8

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

 

[Dusty Stevens]

Fillister head maybe?

 

[Dusty Stevens]

Could it be a 4-40?

 

[Walt Krafft]

Looks like an insert screw for a Kennametal mini boring bar. A little different head but the correct size.

 

[Walt Krafft]

Looks like the closest size is a 1-72.

 

[NV_Dmax]

Could it be a 4-40?

It could be.
These 2 screws are from a Bix and Andy bench rest trigger. They fasten the small trigger shoe clamp bar to the trigger assembly. I bumped it a little too hard reassembling the rifle and it pulled the threads out (there was only 1-1.5 threads engaged anyways). If I could find the same screw but 2-3mm longer I would be back in business. The issue here is the small bar that the screw head counter sinks into doesn’t have much room left to upsize.

I was hoping the collective minds would recognize that style before I start cutting metal.

 

[Dave Zander]

Call Bullet central , they should be able to help you

 

[JohnW...ski]

If its for your Kennametal boring bar, they should have spare parts.