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 Post subject: WTB: Cheesehead screws for Military I-177 Tube Tester
PostPosted: Jan Sun 14, 2018 12:05 am 
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Location: Dos Rios, CA.
Looking for small mounting screws used on the first metal encased series of the I-177 made for the Signal corps by Hickok.
Could use (6) screws if anyone has a junk/parts model lying around with extras.
Thanks
Kent


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Hickok I-177 Screws.jpeg
Hickok I-177 Screws.jpeg [ 57.19 KiB | Viewed 282 times ]


Last edited by ampstamp88 on Jan Sun 14, 2018 5:10 am, edited 3 times in total.
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 Post subject: Re: WTB: Small flathead screws for Military I-177 Tube Teste
PostPosted: Jan Sun 14, 2018 12:25 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Maryland 20709, USA
Hi Kent,

Do you know what thread (sounds like maybe #4-40)?
My 177 is currently buried.

McMaster-Carr Supply has a huge selection of screws in small quantities.
http://www.mcmaster.com

- Leigh

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 Post subject: Re: WTB: Small flathead screws for Military I-177 Tube Teste
PostPosted: Jan Sun 14, 2018 12:48 am 
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Thanks Leigh for link,
The style used back then is a bit different than manufactured today.
I'll try and post some photos shortly, they are 7/16" long machine screws, just under ½" in length....

10 screws are used on this model, perhaps the I-177-A used these as well although metal cabinet depth is different.
The TV-7 and later military testers use a larger size.
I have four screws found on bottom of case as tester was not packed properly for shipment when received
and was rolling inside shipping box during transit, guess I'm lucky to have four!


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 Post subject: Re: WTB: Small flathead screws for Military I-177 Tube Teste
PostPosted: Jan Sun 14, 2018 2:17 am 
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Joined: Feb Mon 04, 2008 3:20 am
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Location: Coopersville, MI 49404-9643
FYI

Those are what is known as fillister head screws. They are not flat head. Hardware is a breed all unto itself.

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 Post subject: Re: WTB: Small flathead screws for Military I-177 Tube Teste
PostPosted: Jan Sun 14, 2018 2:25 am 
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Joined: Apr Sat 04, 2015 6:15 am
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Location: Dos Rios, CA.
Thanks Kim, that's quite helpful...
I've used them before in restoring vintage microphones and didn't know what they were called.


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 Post subject: Re: WTB: Fillister head screws for Military I-177 Tube Teste
PostPosted: Jan Sun 14, 2018 2:37 am 
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McMaster-Carr has fillister-head screws.

- Leigh

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http://www.AtwaterKent.info
Click "Grebe Stuff" for Synchrophase info


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 Post subject: Re: WTB: Fillister head screws for Military I-177 Tube Teste
PostPosted: Jan Sun 14, 2018 3:26 am 
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Joined: Apr Tue 19, 2011 6:24 am
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Location: 07470
Fillister head screws might not be what your tube tester originally had. Look at the other fasteners inside the case, as manufacturers often used similar parts for commonality, and the military encouraged that.
Be careful what you buy: If the tops of those screws are entirely flat and not domed at all, they are properly called "Cheese-Head" screws (no joke, even in Wisconsin).

The ones shown above are NOT Fillister style: Fillister heads are essentially modified Cheese-heads with convex tops. Both types have deep slots for strength and grip, and are almost interchangeable, but, if you are fussy about authenticity go with the original style. Cheese-heads reduce screwdriver cam-outs better than many other styles and offer higher head strength. They are still commonly available.


--- Here's a good recognition guide:http://www.jamesglen.com.au/head-styles/. ---


Best of success with your very nice tube tester,

OTH


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 Post subject: Re: WTB: Fillister head screws for Military I-177 Tube Teste
PostPosted: Jan Sun 14, 2018 4:40 am 
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Thanks OTH for the chart, now I'll know what I'm looking for with microphone repair as well.
Yes, the original screws then are flat- topped cheeseheads.
I've owned one of these testers before a few years ago and they were the same type of screws.
Unlike the TV-7, I did not see any screws similar to the mounting screws underneath chassis.


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 Post subject: Re: WTB: Cheesehead screws for Military I-177 Tube Tester
PostPosted: Jan Sun 14, 2018 3:58 pm 
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Joined: Mar Wed 16, 2011 10:44 pm
Posts: 574
Location: Peekskill, NY
Judging from the photo, a cheese head screw would have to be modified by reducing the
head diameter to match the originals. If the overall length is 7/16 inch then the thread
is probably 6-32 or 8-32, I would guess.

These were most likely specialty fasterners made for this type if instrument. The
easiest route would be to purchase from mcmaster carr as mentioned but if the head
diameter is critical it would be an easy job to reduce that to match the originals.


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 Post subject: Re: WTB: Cheesehead screws for Military I-177 Tube Tester
PostPosted: Jan Sun 14, 2018 8:09 pm 
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Joined: May Wed 11, 2016 2:18 am
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Location: springvalley ohio
Fastner-express.com out your way has them..u can ask for dimensions of there heads. They have good deals on kits


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 Post subject: Re: WTB: Cheesehead screws for Military I-177 Tube Tester
PostPosted: Jan Mon 15, 2018 8:46 am 
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Joined: Apr Sat 04, 2015 6:15 am
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Location: Dos Rios, CA.
Bought a few brass ones for now at old time type hardware store in east Sacto today, turned out the threads were 4/40 as Leigh earlier mentioned...
I have some yucky looking nickel 4/40's back at home I use for XLR jack installations in amplifiers, so the brass ones I think look better for the time being
Didn't see any actual cheesehead screws there and all heads were much larger in width than originals...

Still hoping someone's got a rusty hulk tester box lying around used as a doorstop or rowboat's anchor...also looking for a hasp clip ring (one is missing) to help keep it closed up...


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