What screws should I get?

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  #1  
Old 01-30-20, 11:43 AM
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What screws should I get?

I'm trying to figure out what kind of screws to use for an aluminum servo arm, which the manufacturer says has "four tapped 2mm screw holes".

I don't know too much about screws and thread sizes so I would really appreciate your help!
 
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Old 01-30-20, 12:05 PM
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Amazon has a good search filter for screws. Here is the link:

Amazon screw search filter
 
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Old 01-30-20, 12:11 PM
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Welcome to the forums.

What are you working on ??
A 2mm screw is a screw with a metric machine thread. It's rather small. You can buy metric screw kits directly online. Many local hardware stores have pullout drawers of metric screws. You'll not likely find small metric hardware at a home improvement store.

I buy metric hardware by the kit. It comes with 2mm ,2.5mm, 3mm ,4mm and 5mm screws and nuts.


Metric hardware
 

Last edited by PJmax; 01-30-20 at 12:41 PM.
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Old 01-30-20, 12:50 PM
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Are these screws going into the servo body or for attaching bits to the arm?

When looking for screws or bolts metric 2mm ones are usually referred to M2. M for metric and the two is the diameter. M2 is easy as it only comes with one thread pitch, .4mm. Then, lastly you need to specify the length of the screw and is usually a dash with the length in mm. For example a 2mm diameter screw or bolt with 4mm of threads would be a M2-.4-4 (M for metric, 2 diameter, .4 thread pitch, 4 length of threads).

When you get up to M8 hardware is available in fine or coarse pitch threads. For something like a 8mm diameter bolt it will be an M8 and can have either a 1.0 or 1.25 mm thread pitch so when ordering larger stuff make sure you get the right one. A
 
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Old 01-30-20, 12:52 PM
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Use this site to look up just about any piece of hardware you can think of!

https://www.mcmaster.com/
 
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Old 01-30-20, 01:48 PM
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The screws are for attaching something else to the arm. The site doesn't say anything about the thread of the screw holes, so I'm guessing M2 screws would likely work?
 
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Old 01-30-20, 02:58 PM
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Yes.... M2 screws are what you need. You just need to determine the length.
 
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Old 01-30-20, 05:30 PM
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The site doesn't say anything about the thread of the screw holes
Sure it does, M2 thread is, well it's a M2 thread, uses a M2 tap!
 
 

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