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Posted: 7/15/2015 2:46:15 PM EDT
Hi all,
I helped a friend install a mesa tactical rail/shell carrier on his Benelli Nova, but because we had to drill+tap our own holes in his receiver the screws that come with the kit from Mesa are just a bit too short (shell holder is designed for the super nova). They provide a set of 8-40 UNS-2B 1/2" flathead screws. What I'm looking for is something a hair longer. Maybe 5/8", but if all I can get is longer than that I can always grind it down to where we need it. You can get a rough idea of the shape of the screws in this pic: 
Thanks in advance for any help/advice. |
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Posted: 7/15/2015 3:10:03 PM EDT
[#1]
Did you try McMaster Carr?
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Posted: 7/15/2015 4:42:00 PM EDT
[#2]
Tried is the operative word there. They got a lot of stuff, and I didn't come across anything in this thread/size.
I looked through their site as well as places like Grainger. |
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Posted: 7/15/2015 5:04:38 PM EDT
[#3]
Any particular reason you tapped the holes 8-40 if you were going to need something longer anyway?
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Posted: 7/15/2015 8:48:06 PM EDT
[#4]
Quote HistoryQuoted:
Tried is the operative word there. They got a lot of stuff, and I didn't come across anything in this thread/size. I looked through their site as well as places like Grainger. call them...trust me |
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Posted: 7/15/2015 9:23:41 PM EDT
[#5]
Not sure if any of these will work for you or not: http://www.brownells.com/gunsmith-tools-supplies/small-hardware/metal-screws/long-6-48-8-40-screws-prod19929.aspx
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Posted: 7/15/2015 11:54:25 PM EDT
[#6]
Quote HistoryQuoted:
Any particular reason you tapped the holes 8-40 if you were going to need something longer anyway? Well....simple answer is we didn't measure before we cut. The supplied screws make it into the receiver, but probably only a few threads deep. I'd feel better about it if they were sitting deeper. |
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Posted: 7/15/2015 11:55:50 PM EDT
[#7]
Quote HistoryQuoted:
Not sure if any of these will work for you or not: http://www.brownells.com/gunsmith-tools-supplies/small-hardware/metal-screws/long-6-48-8-40-screws-prod19929.aspx Thanks, but no luck. Ordered those, waited forever to get them, and the screw heads just aren't right (all way too small). |
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Posted: 7/16/2015 8:46:49 AM EDT
[#8]
Did you call Mesa?
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Posted: 7/16/2015 9:20:07 AM EDT
[#9]
Quote HistoryQuoted:
Thanks, but no luck. Ordered those, waited forever to get them, and the screw heads just aren't right (all way too small). Quote HistoryQuoted:
Quoted:
Not sure if any of these will work for you or not: http://www.brownells.com/gunsmith-tools-supplies/small-hardware/metal-screws/long-6-48-8-40-screws-prod19929.aspx Thanks, but no luck. Ordered those, waited forever to get them, and the screw heads just aren't right (all way too small). Can you deepen the chamfer??????? |
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Posted: 7/16/2015 10:19:48 PM EDT
[#10]
Quote HistoryQuoted:
Can you deepen the chamfer??????? Quote HistoryQuoted:
Quoted:
Quoted:
Not sure if any of these will work for you or not: http://www.brownells.com/gunsmith-tools-supplies/small-hardware/metal-screws/long-6-48-8-40-screws-prod19929.aspx Thanks, but no luck. Ordered those, waited forever to get them, and the screw heads just aren't right (all way too small). Can you deepen the chamfer??????? That is a viable option but for mounting a rail/base/etc I would want to be sure to get the countersink perfect which means putting it on a mill and indicating each of the holes... |
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Posted: 7/17/2015 9:10:16 AM EDT
[#11]
AND? You only need 2-3 threads if your tapped hole is clean and not oversized. A dot of red loctite and you should be good. At worst you will have to set it up in a mill or good drill press and set the spindle stop .020" - .040" deeper and counter sink the holes. 8-40 is a common thread for guns/Gunsmithing, but tough to find locally. Mc Master-Carr can get them for you, but you will have to call them directly.
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Posted: 7/17/2015 9:33:06 AM EDT
[#12]
Quote HistoryQuoted:
AND? You only need 2-3 threads if your tapped hole is clean and not oversized. A dot of red loctite and you should be good. Holy crap, NO. The Nova uses a polymer receiver. Even in an aluminum receiver, mounting a side saddle that will be holding a good bit of weight against 12ga recoil with only 2-3 (super fine) threads is a bad idea. p556guy, i'm questioning the wisdom of this whole thing, doesn't the supernova have cast-in thread inserts for the top rail mount? |
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Posted: 7/17/2015 11:56:58 AM EDT
[#13]
Sorry, my bad, didn't see that it was a Nova. 40 tpi = 1/8" approximately, so in a steel receiver it would be good. In aluminum, you will want the screw to go in the full length of thread in receiver and Loctite. Plastic is not going to hold it that long, unless it has metal inserts that were designed for that application.
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Posted: 7/17/2015 12:57:22 PM EDT
[#14]
Hard materials use finer threads for strength.
Soft materials use larger threads (lower pitch) for strength. There had better be steel inserts in the plastic. |
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Posted: 7/18/2015 3:56:58 AM EDT
[#15]
Quote HistoryQuoted:
Did you call Mesa? Quote HistoryQuoted:
Did you call Mesa? Didn't consider they'd have longer screws than they need on-hand, but I guess it can't hurt to call. Quoted:
Can you deepen the chamfer??????? I don't think so, because then the mounting surface on the rail would be weakened i think. Quoted:
AND? You only need 2-3 threads if your tapped hole is clean and not oversized. A dot of red loctite and you should be good. At worst you will have to set it up in a mill or good drill press and set the spindle stop .020" - .040" deeper and counter sink the holes. 8-40 is a common thread for guns/Gunsmithing, but tough to find locally. Mc Master-Carr can get them for you, but you will have to call them directly. Haven't put in loctite yet, but I'd really feel better about it if the screw was flush to the bottom of the hole. If it was a 22 I wouldn't worry, but 12ga packs a lot of kick. Thanks for all the ideas guys. |
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Posted: 7/18/2015 5:03:51 PM EDT
[#16]
Quote HistoryQuoted:
Hard materials use finer threads for strength. Soft materials use larger threads (lower pitch) for strength. There had better be steel inserts in the plastic. At this point we did the work on this over a year ago so my memory is fuzzy, but I'm pretty sure the receiver was metal, not plastic. |
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Posted: 7/19/2015 9:35:38 AM EDT
[#17]
Quote HistoryQuoted:
At this point we did the work on this over a year ago so my memory is fuzzy, but I'm pretty sure the receiver was metal, not plastic. Quote HistoryQuoted:
Quoted:
Hard materials use finer threads for strength. Soft materials use larger threads (lower pitch) for strength. There had better be steel inserts in the plastic. At this point we did the work on this over a year ago so my memory is fuzzy, but I'm pretty sure the receiver was metal, not plastic. Maybe you got into some of the reinforcements, the Nova has always been polymer with some cast-in steel support. |
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Posted: 7/20/2015 7:24:03 PM EDT
[#18]
Quote HistoryQuoted:
Didn't consider they'd have longer screws than they need on-hand, but I guess it can't hurt to call. I don't think so, because then the mounting surface on the rail would be weakened i think. Haven't put in loctite yet, but I'd really feel better about it if the screw was flush to the bottom of the hole. If it was a 22 I wouldn't worry, but 12ga packs a lot of kick. Thanks for all the ideas guys. Quote HistoryQuoted:
Quoted:
Did you call Mesa? Didn't consider they'd have longer screws than they need on-hand, but I guess it can't hurt to call. Quoted:
Can you deepen the chamfer??????? I don't think so, because then the mounting surface on the rail would be weakened i think. Quoted:
AND? You only need 2-3 threads if your tapped hole is clean and not oversized. A dot of red loctite and you should be good. At worst you will have to set it up in a mill or good drill press and set the spindle stop .020" - .040" deeper and counter sink the holes. 8-40 is a common thread for guns/Gunsmithing, but tough to find locally. Mc Master-Carr can get them for you, but you will have to call them directly. Haven't put in loctite yet, but I'd really feel better about it if the screw was flush to the bottom of the hole. If it was a 22 I wouldn't worry, but 12ga packs a lot of kick. Thanks for all the ideas guys. that's why I said to call Mcmaster etc...earlier they can find stuff that is hard for a user to find in their system....I do it all the time... |
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Posted: 7/21/2015 2:44:50 PM EDT
[#19]
Will these work?
(Double check the head diameter to make sure it is large enough - Brownells can give you that measurement if you call) |
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Posted: 7/21/2015 3:15:18 PM EDT
[#20]
You can always find a machinists to make some up.
It would be painfully expensive at a commercial shop, but a hobby guy might do it for not that much. |
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Posted: 7/21/2015 3:50:14 PM EDT
[#21]
Fastenal will have what you need. Or any of the specialty fastener stores, like american bolt.
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Posted: 7/21/2015 4:02:26 PM EDT
[#22]
Quote HistoryQuoted:
Fastenal will have what you need. Or any of the specialty fastener stores, like american bolt. and if you cant find them on their web page...call them 
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Posted: 7/21/2015 5:34:40 PM EDT
[#23]
Larger than you need is easy to reduce.
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Posted: 7/21/2015 8:43:19 PM EDT
[#24]
Quote HistoryQuoted:
and if you cant find them on their web page...call them Quote HistoryQuoted:
Quoted:
Fastenal will have what you need. Or any of the specialty fastener stores, like american bolt. and if you cant find them on their web page...call them Op said 5/8" or longer. If you want to get picky... ETA: If you go longer get a couple nuts to run up the bolt before you cut it to chase the threads back out after its cut. |
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Posted: 7/22/2015 10:18:37 AM EDT
[#25]
Quote HistoryQuoted:
Op said 5/8" or longer. If you want to get picky... ETA: If you go longer get a couple nuts to run up the bolt before you cut it to chase the threads back out after its cut. Quote HistoryQuoted:
Quoted:
Quoted:
Fastenal will have what you need. Or any of the specialty fastener stores, like american bolt. and if you cant find them on their web page...call them Op said 5/8" or longer. If you want to get picky... ETA: If you go longer get a couple nuts to run up the bolt before you cut it to chase the threads back out after its cut. An actual die works even better. |
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Posted: 8/5/2015 2:04:33 PM EDT
[#26]
I was amazed at the selection of gunsmithy type screws that ACE Hardware stocks in those drawered bins
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