A little help please. I need to chase a thread in the receiver where the trigger guard screws go in. Are they 1/4-28NF ?
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A little help please. I need to chase a thread in the receiver where the trigger guard screws go in. Are they 1/4-28NF ?
i belive 1/4 x25,,,ill check my notes and let you know for sure, careful,,,easy to blow that hole right out.
Quote:
Originally Posted by chuckindenver
You're right!
1/4-25??? why the heck would they do that to me? I'm not even sure where to look for a tap of that pitch. They sure picked some odd threads (by today's standards). The ding is really just on the lead in thread, so it should clean up ok. Probably could force the fastener in and still work, but I'm not gonna.
Quote:
Originally Posted by Allen Humphrey
I'm sure Chuck will tell you where you can get such oddities, if you really need one. The price will probably make you cry.
I only responded so quickly because I actually had a list of such oddities in front of me, literally between the keyboard and the screen, and was racking my brains wondering why on earth the M1917 has 1/4-30, and where the heck did I park the 1/4-30 tap and die - I actually found a pair at a boot sale in the UK, and don't reckon I have much chance of ever finding one again, certainly not here in metric country.
And be glad you're not looking for Enfield screws!
:wave:
1/4-30, that sucks but misery loves company:) Brownells has the 1/4-25 taps for approximately a dollar per thread. I am afraid to see what the 1/4-30 might be!
Thanks Patric and Chuck.
Quote:
Originally Posted by Allen Humphrey
Probably a pound per thread! This thread was used on No. 1 Enfields, but no longer on No. 4s, so the chances of finding one new are approximately 5/8 of FA, as British engineers like to say. Maybe one can get them in Australia or India?
Quote:
Originally Posted by Allen Humphrey
Allen, you need to apply a bit of backwoods engineering!
The old trick for cleaning up a threaded hole, IF you have a spare steel screw of the correct thread, is to file a little slot down the side, to make it look like a self-tapping screw, harden this screw, and then use it as, in effect, a simple one-fluted tap.
If you do not have a spare (a common situation with rarities) then do basically the same with your one-and-only, but file the slot just though the first 2-3 turns, and do not try any hardening! This is usually good enough to reform a burred thread. Better than brute force, anyway!
Patrick
:wave:
Hmmm. Home made tap. We call that Farm Tech around here, but it would probably do the trick. I don't have a spare, but they are around and I can grab some at the next show I suspect.
I'll bet your 1/4-30 taps are lying around India by the gross somewhere, and my 1/4-25 is probably knocking around Greece.
check MCS they have any tap size you want...price wont be too bad...id bet around 50.00
Chuck, thanks for the tip, but could you please be a wee bit more precise? It's a big wide world out there on the internet.
I found an MSC Industrial Supply Co. that has about a thousand different dies, and thousands of taps*, but not an MCS that made much sense.
If you did indeed mean MSC, then they even have a 1/4-30 die! But no 1/4-25 that I can see.
Patrick
:wave:
*Not a joke or exaggeration. Look it up! 1750 dies. 17570 taps.
In 1/4" diameter you can have 18,20,24,27,28,30,32,36,40,48,56,72,or 80 t.p.i. !!!
But no 25 tpi.
msc is the company i ment,,,you have to dig, or ask for a book from them....the book weighs in at 5 pounds...great sorce for tooling
Patrick,
I think Brownells also has your 1/4-30 tap for 22.99 US dollars. God only knows what the shipping might be to get across the pond. Here is a link to the HSS tap section. Sombody needed to give my American and your English engineers a whack on the forehead with a slide rule for choosing those thread sizes.....but they sure did a good job on the rest of it:)
I checked Chuck's MSC and I couldn't find our taps on-line, but I'll bet if you called or got the catalog per Chuck's suggestion, they would have it. They have a ton of stuff.
BROWNELLS : HIGH SPEED STEEL TAPS - World's Largest Supplier of Firearm Accessories, Gun Parts and Gunsmithing Tools - BROWNELLS
msc is waaaay cheaper the Brownells......waaaaaayyyyyy cheaper.
Quote:
Originally Posted by chuckindenver
I agree. The prices seem favorable when I see what a non-metric tap costs here. It is astonishing how many taps & dies one can have, and still not have the right one. Screw thread systems are one of those fields where the world has always been afflicted by the "not invented here" syndrome".
As to MSC versus Brownells, I have observed on several occasions that something that, as an industrial product, can be bought by the gallon without wrecking your budget, suddenly costs the same for a scent-bottle sized flask if it is sold as shooting supplies. And the industrial product is usually precisely labelled, without any snake-oil fantasy as can be found on the "delicatessen" products offered to shooters, model-makers etc.
Oops, this is turning into a rant, better stop now!
Patrick
:wave:
Sorry I'm late to the party, try Victor Machinery Exchange Inc. in Bklyn, NY
1/4-30 tap $7.90, has a lot of odd ball tap and dies, also metric
Victor Machinery - Metalworking tools and supplies
Springfield didn't want to pay royalties for patent rights. So they made up their own parts.
Try Kromhard twist drill in Akron OH if they do not have a tap in stock they will make you one. http://www.kromhard.com/
Quote:
Originally Posted by Calif-Steve
OK to make your own parts, but why on earth invent a new thread diameter/pitch combination? Or did they have underemployed toolmakers? In my "It might come in handy one day" draw - well, actually, it's 360 draws in 3 converted office wall cabinets - I have a Chinese-marked 5.5mm die with 0.9mm pitch. One of those things that you just dare not throw away, otherwise Murphy's Law will cut in and ensure that you need it the very next day!
Patrick
from the Krag, 1903. Johnson,, and the 1903. all share this screw size. it had nothing to do with Mauser or payin them money..
same thing with the band screws, and butt plate screws,..the didnt change them from the trap door, to the M1 Garand, and trench guns.
the 1917 shares the same screw pitch with the P14....
they didnt change do to they had it in use, with lots of back stock,,if it aint broke dont fix it sort of deal...
but the screw pitch had nothing to do with Mauser....