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Building Tips and technical articles. => 1/2 A building. => Topic started by: Motorman on August 18, 2019, 04:40:34 PM

Title: 3-48 Nuts & Bolts
Post by: Motorman on August 18, 2019, 04:40:34 PM: blank
Title: Re: 3-48 Nuts & Bolts
Post by: Trostle on August 18, 2019, 05:19:45 PM: Micro Fasteners has all sorts of neat stuff. 3-48 nuts and bolts but do not list any 3-48 blind nuts.

https://www.microfasteners.com/

I have not found a source for these things for several years. They sometime show up on eBay.

Keith
Title: Re: 3-48 Nuts & Bolts
Post by: Tim Wescott on August 18, 2019, 05:27:15 PM: RTL https://www.rtlfasteners.com also has 3-48 hardware, but no T-nuts.
Title: Re: 3-48 Nuts & Bolts
Post by: Trostle on August 18, 2019, 05:50:46 PM: There is a real deal on the bay right now. One package of DuBro 3-48 Blind Nuts that used to sell for 20 cents is up for bid right now. Buy it now for $12.99 plus $4.75 for shipping.

Keith
Title: Re: 3-48 Nuts & Bolts
Post by: 944_Jim on August 18, 2019, 08:53:08 PM: MM,

I'll let you know I've been watching for that size for about a year. No, I won't pay $13 for NOS parts that small.

I decided to build down to 2-56 for those places that 3-48 are called for. Even my BHM Mosquito uses 2-56 hardware to hold the Norvel Big Mig .074 engines on. No loss there for the smaller hardware.

I tried to see what metric stuff may substitute so I can get closer to the optimum/unobtainium 3-48 stuff. From what I researched, it would have to be M2.5, but no T nuts exist. Next size up is M3, but that is really close to 4-40.

So we are SOL except for eBay's golden bolt sets.
Title: Re: 3-48 Nuts & Bolts
Post by: pat king on August 19, 2019, 10:12:06 AM: I have been trying to find a source for 3-48 blind nuts, but so far no luck. I will keep searching.

Pat
Title: Re: 3-48 Nuts & Bolts
Post by: bill bischoff on August 19, 2019, 11:13:19 AM: airborne-models.com has M2.5 blind nuts
Title: Re: 3-48 Nuts & Bolts
Post by: pat king on August 19, 2019, 12:49:31 PM: Bill,
Thanks for the info. They are rather pricey at $1.50 for 4 pieces. I have requested a quote for quantities.

Pat
Title: Re: 3-48 Nuts & Bolts
Post by: bob whitney on August 19, 2019, 02:17:28 PM: I have been making brass insert's using course brass bolts ,cutting them to length to go the full depth of the motor mount and tapping them for 3/48. I would need to look and see what size bolts I use ,six or 8/24 or 32
Title: Re: 3-48 Nuts & Bolts
Post by: 944_Jim on August 19, 2019, 04:23:07 PM: Mr. Bill,

Thanks a bunch! That M2-5 is really close to the major diameter of #3 (.0990").
This is probably why no one stocks (or makes) #3 stuff anymore.

Y'all better get yours, because I'm about to buy that vendor out! Well, about to order a couple dozen anyway.
Title: Re: 3-48 Nuts & Bolts
Post by: 944_Jim on August 19, 2019, 06:03:28 PM: Well, email came back. Vendor was clear..."There they are (link to the nuts), and that is the price." Followed by their Chinese source is charging an extra 25% these days.

I hope #4 hardware or M3 hardware fits my bigger engines...OS LA .15, Norvel .15, Norvel .25, Cox .09 and .15. I don't want to trust #2 with those engines.

At least we know someone somewhere is making M2.5...off to hunt it down now!
Title: Re: 3-48 Nuts & Bolts
Post by: 944_Jim on August 19, 2019, 06:24:20 PM: Ok...some more digging. Oddly, the url says M2, but the description shows M2.5. Promising, especially given $6 for 50! Florida address to boot!

http://boomarc.com/en/10-x-m2-blind-nuts

I'll send an email later.
Title: Re: 3-48 Nuts & Bolts
Post by: 944_Jim on August 20, 2019, 09:02:10 AM: I hate to thread-jack, but if Mr. Whitney is still watching...

Mr Whitney, could you start another thread and showcase the work? I'm intrigued by the idea and would like to see a few examples. I assume you epoxy the inserts into place.

Thanks in advance.
Title: Re: 3-48 Nuts & Bolts
Post by: bob whitney on August 22, 2019, 09:28:28 AM: my pictures are too big to post here but send me your address and I will try to walk through how I make the 3/48 brass incerts
Title: Re: 3-48 Nuts & Bolts
Post by: Chuck Stanley on October 06, 2020, 09:43:09 AM: For everyone looking for any kind of bolts or nuts go to the website of Bolt Depot. They have everything in just about every size and metal strength. Grade 8, grade 5 and stainless and oxide coated. You can buy 1 piece or 1,000 pieces whatever you need and I have found that they are less expensive than anyone else. You go from 256 to -56 to 1/2 inch diameter. Go to Bolt Depot's website and look around. You will be surprised at the prices and contents. However, the only thing they do not carry are blind nuts. Hope this helps.
Title: Re: 3-48 Nuts & Bolts
Post by: Al Williams on March 16, 2021, 02:02:53 PM: https://www.mcmaster.com/96439A170/
These would work just epoxy in
Title: Re: 3-48 Nuts & Bolts
Post by: Jim Carter on March 16, 2021, 03:15:23 PM: Quote from: Motorman on August 18, 2019, 04:40:34 PM
Having a hard time finding those 3-48 blind nuts with the 3/4" bolts in the same pack that Perfect use to sell. Can't find much of anything 3-48 really. Where do you get that stuff these days?

Thanks,
Motorman 8)
Hello! I have 20 packs or Dubro-134, 3-48 blind nuts that I'll probably never. They're yours for say ... $8 plus postage to your location.

Jim Carter
Title: Re: 3-48 Nuts & Bolts
Post by: bob whitney on March 16, 2021, 03:34:07 PM: i will take them H^^
Title: Re: 3-48 Nuts & Bolts
Post by: Jim Carter on March 16, 2021, 04:10:29 PM: Quote from: bob whitney on March 16, 2021, 03:34:07 PM
i will take them H^^
Deal! Drop me a pm with your address and I'll be heading to the post office! Of course, you could come visit us at our flying field here in Titusville and I'll have them with me and you can get in some flying time and laughter together with the "gang"!!

Jim Carter