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Looking for 1.5mm hex screw/set screw for motor mount;Help!

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#1 smilingmoose

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Posted 15 June 2019 - 11:31 PM

I am missing a small, 1.5mm hex "set screw" for my motor mount on my Meade 4501 refractor scope.  I cannot find this little guy anywhere.  I have 1 but need 1 more.  Its very small.  measures about 3/16 long. Can anyone help or guide?

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#2 scadvice

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Posted 15 June 2019 - 11:46 PM

It's most likely a 1.6mm set screw. I've not heard of a 1.5 but I could be wrong.

 

Alloy Steel Cup-Point Set Screw, M1.6 x 0.35 mm Thread, 3 mm Long part number 91390A087 @ $3.23 ea.

 

https://www.mcmaster...tric-set-screws


Edited by scadvice, 15 June 2019 - 11:50 PM.


#3 smilingmoose

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Posted 15 June 2019 - 11:49 PM

The manual says to use a 1.5mm hex screw to tighten it.  Could it be that the screw would be 0.1mm bigger for the tool to fit easier?



#4 smilingmoose

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Posted 16 June 2019 - 12:05 AM

OK, I placed the order but i didnt have to pay right away.  Have you ordered from this company before? Do i pay later?  I never seen a total charge with shipping.



#5 markb

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Posted 16 June 2019 - 12:33 AM

McMaster-Carr is famous for not giving you the shipping charge until they generate the invoice and shipping label right before it goes out.

You can email them for an advance quote.

I believe they charge the actual shipping charges from UPS so it should not be too awful.

I have been buying very affordable, good quality assortments of setscrews and button head screws on Amazon to get these small sizes in metric, as well as regular M4, 5 and 6 sizes. Ebay works but shiping is slower. SAE sizes are harder to buy in sets from china, but packs of 5-10 from US suppliers are very reasonable.

As to sizing, these 1.6mm to 2.7mm sizes can be rough to estimate, one of the reasons I have learned to buy 'bracketed' sizes, or to get assortments. Generally, the screws measure across the threads .1 or so less than the M size.

Of course, the hex key size cannot be used to find the needed size setscrew.

Edited by markb, 16 June 2019 - 01:27 AM.


#6 scadvice

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Posted 16 June 2019 - 12:34 AM

Hummm? A standard drive (Allen wrench size) size socket of 1.5mm is for a 3mm socket set screw.

 

https://www.mcmaster.com/91390a099

 

Do you have a set of calipers to measure the diameter of the one you have? If it's a 3mm set screw the diameter will be just under .118". Your local hardware store may have some that size (3mm) to check fit. They might even have the set screw. 

 

When you use a CC with McMaster they e-mail you the shipping cost later. HOWEVER, if you have no acknowledgement e-mailed right away it most likely did not go through or is on hold. I would call them on Monday. Likely they are going to call you Monday for an approval.

 

At this point I'm thinking it's a 3mm set screw not a 1.6 mm.


Edited by scadvice, 16 June 2019 - 12:46 AM.

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#7 scadvice

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Posted 16 June 2019 - 12:45 AM

Use this link. I corrected the one above to give you the right length.

 

https://www.mcmaster.com/91390a099



#8 smilingmoose

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Posted 16 June 2019 - 12:55 AM

Thank you Apollo.  Do you know what type of hardware store would carry this product.  I have a feeling the shipping for the screw will be around $8 which will far exceed the cost of the screw.  



#9 smilingmoose

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Posted 16 June 2019 - 12:58 AM

Bought 1 on ebay for $1.44 shipped :)  Thank you!


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#10 rockethead26

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Posted 16 June 2019 - 11:50 AM

Thank you Apollo.  Do you know what type of hardware store would carry this product.  I have a feeling the shipping for the screw will be around $8 which will far exceed the cost of the screw.  

Try Ace, Homco or a local nut & bolt shop.


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#11 Stevegeo

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Posted 16 June 2019 - 12:00 PM

Hey send me a text, I will get you an assortment....free... I worked in a machine shop and have many ...  


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#12 Daniel Guzas

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Posted 16 June 2019 - 12:31 PM

You can find those and all sorts of “funny” fasteners at Lowe’s or Home Depot. You just have to take the screw with you and go thru all those little drawers they have in the specialty fastener aisle. I have gotten replacements for these very same set screws easily there. They have most sizes. You just have to be patient and try and compare with what you got with what you need. Haven’t been let down yet. I could spend hours in that aisle.. just ask my wife.



#13 John Fitzgerald

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Posted 16 June 2019 - 12:41 PM

That looks like a 3mm set screw.  A 1.5 allen key will fit it.  It's a common hardware item in stores that carry specialty fasteners in the little pull out trays.  Also, Fastenal should have them.


Edited by John Fitzgerald, 16 June 2019 - 12:45 PM.


#14 AhBok

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Posted 16 June 2019 - 01:49 PM

My local Ace Hardware stores all have this item.

#15 paulh83

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Posted 16 June 2019 - 03:31 PM

Bolt Depot is a great website. I used them multiple times to find odd nuts and bolts.

https://www.boltdepot.com/

#16 mac57

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Posted 16 June 2019 - 03:53 PM

Ever try Ace Hardware?  



#17 smilingmoose

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Posted 16 June 2019 - 05:40 PM

You guys all rock!  Thank you for the input.  Hopefully, someone else who is in the same boat, can use this thread to get that scope in tip-top-magoo, and get to the sky huntin.




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