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Old March 27, 2001, 22:55   #1
derek huffman, azexarms
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A permanent thread pitch guide: Make submissions, please

You know...

bbl to receiver: 1"x 16tpi, inch and metric; Israeli, metric thread, chase with 1"x16 die.

cross screw for mag release and BHO. 10/32

pistol grip stud/nut 1/4x28 tpi (metric)

inner threaded hole on buttstock double threaded nut (the one that retains the recoil springs) 1/4x28 tpi (all types)

frame lock lever retaining screw (the little one in the back that keeps the lever in) 10/32

I think this would be a good thing to have here for reference in case some of us who know can help someone save something they have previously considered trashed. And to keep it permanently posted here. Could save some of us a lot of aggravation. D.

[ August 07, 2001: Message edited by: EMDII ]

Last edited by derek huffman, azexarms; September 05, 2002 at 14:13.
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Old August 06, 2001, 22:55   #2
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handguard screw

quote:
--------------------------------------------------------------------------------
Originally posted by dairyboy:
Can I get a new handgaurd screw from my local hardware store. What what size and thread pitch is it.
--------------------------------------------------------------------------------

It's an 1-1/4" long 10-32 Screw!

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Old August 07, 2001, 14:40   #3
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Metric FAL Muzzle Threads 9/16-24 L.H.

L1A1 Pistol Grip Screw is a 1/4-28 slotted round head screw 1-1/4" long and uses a lock washer.

Stg-58 rear Sight Screw(s) US 8-36 x 9/16" long

Gas Tube Pin .078" Dia. x 13/32" long (Hint White Painted Coat Hangers are the Right Dia.)

Gas Tube Nut thread size US 9/16-24 R.H.

FXE

[ August 07, 2001: Message edited by: FXE ]
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Old August 09, 2001, 00:16   #4
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Here's another one!

Metric Front Sight Pin thread US #12-28

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Old August 09, 2001, 10:41   #5
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One more!

Pivot bolt. 1/4x32
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Old August 09, 2001, 11:49   #6
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Quote:
Originally posted by FXE:
Here's another one!

Metric Front Sight Pin thread US #12-28

FXE
Izzy also.
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Old August 09, 2001, 23:41   #7
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Gas block interior, FAL & L1A1 17/32" x 36
Gas tube exterior thread, FAL & L1A1 17/32" x 36
gas tube Rear support, FAL & L1A1 9/16" x 24
L1A1 front sight #10 x 40 5 degree forward slant
Return spring tube cap, inside, FAL & L1A1 1/4 x 28
Front sling swivel screw and rear sight windage screws #8x36
StG front sight #12 (7/32") x 28
Israeli FALO coupler and muzzle 11/16" x 24
Belgian long flash suppressor screw (.335" long, .192" slot head) # 8x40
return spring tube male thread FAL is 17/32" x 36.
return spring tube male thread L1A1 9/16" x 32
return spring tube, female FAL & L1A1 15/32" x 36.
L1A1 Grip Screw is a 1/4"-28 x 1-1/4" 2A slotted dome head (early), slotted cheese head (later), socket head (latest) round head screw
L1A1 grip screw lock washer 1/4" ID x 15/32" OD x .026" internal teeth. I've seen plenty of the same with external teeth.
L1A1 buttplate screw. 1/4 x 28 x 2.5" (L, XL), x 2" (N), x 1.5" (S)
FAL & L1A1 barrel, chamber end 1"x 16
FAL barrel, muzzle end (early, long flash hider) 9/16 x 24 RH
FAL barrel, muzzle end (standard) 9/16" x 24 LH
L1A1 barrel, muzzle end 9/16" x 24 RH

consolidated w/corrected L1A1 return spring tube 12/2016
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Old January 22, 2002, 09:00   #8
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I lost the set screw to the front sight on my Aussy (inch) L1A1 (kit). Does anyone know what size/threads it is?
I was thinking of heading down to the hardware store and seeing if I could find something close enough to work.
TIA
Chuck

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its a #8x36
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Old January 22, 2002, 09:21   #9
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I hate to ask a stupid question but why are all the thread designations I have seen English, or SAE, designations, even on the Metric parts?

I would have thought that any rifle manufactured for a country that used a Metric standard would use true Metric threads. Are folks just using the closest English thread that can be made to fit? Were all rifles actually made with English threads?

Thanks for any info.

Bruce G.
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Old January 22, 2002, 21:50   #10
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Quote:
Originally posted by Bruce G.:
Were all rifles actually made with English threads?
Yes, SAE/standard threads.
They are called standard, not english.
Or SAE like you said.

HTH
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Old January 23, 2002, 10:14   #11
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Sorry, my English heritage coming through. In the days before SAE was a force for standardization, I think they were commonly referred to in some parts of the world as English threads to distinguish them from Metric threads. That may have been in the days of the Whitworth thread though.

Actually, I think the correct designation now is Unified threads.

Interesting thread on threads eh?
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Old January 23, 2002, 10:23   #12
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I wasn't trying to SCREW anyone up, but since we were TAPPED to provide input, it was an opportunity to DIE for. We should all PITCH our best info so we can get to the ROOT of the matter. We must remain UNIFIED if we want to hold things together.

This may end up CROSS-THREADED on the humour board. Just so it isn't STRIPPED completely.

This thread was ROLLED not CUT.
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Old August 29, 2002, 19:28   #13
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does anyone know the thread size to the wooden pistol grip(bottom of the popcicle stick) of an L1A1, just replaced the furniture on a century l1a1 and it had a polymer pistol grip with a screw, this one has a metal insert that is treaded and i dont know the size.





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August 28, 2002 22:39 Post #2

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Ironwood or original issue? The new US made wood grips use a different thread on the screw than the real deal grip.



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its the original issue.





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I believe it to be a 1/4" NF 24. Might want a second opinion on that though, I can't find my original screw. That and I don't have a tap to run through the grip or a die to make a bolt to test with. I do know the Ironwood ones are a 1/4" NC 20. If nothing else take the grip to the hardware store and test and try.



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August 29, 2002 20:06 Post #5

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Had the same prob. 7x16 mm. Use a hex head, found it at Lowes.
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Old August 29, 2002, 20:24   #14
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Quote:
Question
does anyone know the thread size to the wooden pistol grip(bottom of the popcicle stick) of an L1A1 ....this one has a metal insert that is treaded and i dont know the size.
Quote:
Answer
FAL_FREAK
I believe it to be a 1/4" NF 24. Might want a second opinion on that though, I can't find my original screw. That and I don't have a tap to run through the grip or a die to make a bolt to test with. I do know the Ironwood ones are a 1/4" NC 20. If nothing else take the grip to the hardware store and test and try.
Quote:
Answer
Glenlivet_1
Had the same prob. 7x16 mm. Use a hex head, found it at Lowes.

If your talking about the screw on the bottom of a L1A1 wooden grip that holds on the the popcycle stick it's a #8-36 SAE Screw!

HTH
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Old August 29, 2002, 22:26   #15
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Quote:
Originally posted by idsubgun


Yes, SAE/standard threads.
They are called standard, not english.
Or SAE like you said.

HTH
Hmm... I believe historically speaking, the English standardized the measurement system which we first used in the USA, based on Imperial English measurements (inches feet etc).

I believe this first standard was developed by Sir Whitworth, became the British Standard Whitworth (BSW), which evolved into British Standard Fine (BSF). Then an American devloped a modified version which was adopted by the U.S. Society of Automotive Engineers (SAE). And then after WWII, all us proper English speaking allies (US, England, Canada, Australia) got together and mutually adopted Unified National Fine (UNF), which I believe the FAL uses. We should note that most of the FAL threads, while Imperial or SAE in standard, are not the commonly found SAE National Fine (NF) and Course (NC) thread pitches, but are generally much finer.

I'd call it an English standard, 'cause it evloved from an English measurement system, and an English thread Standard, but most importantly of all, becuase the other standard used in the world was developed by the French.

Hail Britannia!!!!!!

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Old September 01, 2002, 11:18   #16
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If Ironwood L1A1 then the size is 1/4" x 20 1 1/4"

Ironwood handguards use a different than original screw also, but I don't remember the size.
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Old September 05, 2002, 14:12   #17
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Rear sight windage screws for both Metric and L1 are 8/36, not 8/40

Co incidentally, the same as AR15 front sight. D.
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Old September 10, 2002, 23:35   #18
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I think the metric designation comes from the fact that the dimensions on the print for the receiver are all metric. however
I have always thought it strange that all the threads are english?
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Old September 10, 2002, 23:39   #19
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Also strange, the screw that holds the ejector in a moisn nagant is the same as the screw that locks the long browning flashider.
#8- 32 why are russians using english threads?
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Old September 24, 2002, 09:06   #20
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Metric Threads

The pistol grip stud thread and the internal thread on the return spring tube nut (for the screw that holds the butt plate on the wooden stock) on the G1 lower I got from Tapco is 6x1mm. Six mm diameter by 1.0mm thread pitch.
A 1/4-28 UNF nut will screw onto a 6mm stud or screw but it will be quite sloppy.
A 1/4-28 UNF screw will NOT go into a 6mm nut.
The outside diameter of the 6mm fastener is about .015 inch smaller than the 1/4 inch fastener.
Thanks.
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Old September 24, 2002, 16:47   #21
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Quote:
Originally posted by gunplumber
...the correct size for both on a G1 is 1/4x28 ...
I'll second that one!

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Old September 25, 2002, 07:52   #22
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1/4-48 UNF

Gunplumber you are correct. I got hold of a set of thread pitch gauges and checked again and the threads are 1/4-28.
Thanks.
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Old October 02, 2002, 05:57   #23
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How about the threads on the OD of the return-spring tube where it mounts to the lower? I'm assuming this is the same thread as the opposite (recoil pad) end of the tube, but have not disassembled to check.

Thanks!

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Old October 02, 2002, 17:25   #24
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Quote:
Gas tube exterior thread, metric and inch 17/32 x 36
Thanks, Gunplumber! Missed it in my first go-round.

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Old October 08, 2002, 09:18   #25
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G1 Bipod Screws

I had to make new screws for the bipod that came on the G1 front end.
Thread is 5/16-24 UNF.
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Old December 22, 2002, 00:29   #26
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How about L1A1 Muzzle Threads?
I saw Metric above, but no mention of inch.

I know it's probably listed somewhere, but I haven't found it yet!
Itwould be useful to have it on this thread.

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Old December 22, 2002, 16:37   #27
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Thanks gunplumber!

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Old October 01, 2003, 10:44   #28
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And more from gunplumber:

Quote:
the metric hinge pin is 1/4 x 32

the INCH hinge pin is 1/4 x 28

and here I thought I had some defective hinge pins . . ..
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Old February 01, 2005, 10:23   #29
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btt (this should be a sticky!)
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Old March 24, 2005, 12:36   #30
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hey plumber you need to invest in a machinists handbook as thread forms have a little more going on than you are giving...are the threads rolled / formed ..or cut ....what is the real pitch ..do you even have a thread pitch micrometer ???...whats the major od after the thds have been cut ....it will make a big difference if your just poping down to home depot....what the heck happened to the pay attenton to detail guy ..he he
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Old August 13, 2005, 23:39   #31
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Anybody have the para bolt thread pitch? The bolt that holds the hinge assembly to the lower? It looks like 5/8 inch by 36 tpi. I need to chase some threads. Thanks,
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Old August 14, 2005, 10:47   #32
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http://mdmetric.com/tech/thddat8.htm
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Old August 14, 2005, 10:52   #33
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Old November 05, 2005, 21:52   #34
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Quote:
Originally posted by g5
Anybody have the para bolt thread pitch? The bolt that holds the hinge assembly to the lower? It looks like 5/8 inch by 36 tpi. I need to chase some threads. Thanks,
There are two, which is the cause for some confusion. The smaller one is a para lower made from a standard lower. That is, 17/32x36, which is the same as a recoil spring tube male thread. The other is a dedicated para lower and is 9/16x32.

They are both slit in a cross and threaded internally for a screw (#12x32, same as a metric front sight) with a tapered head. The tapered head will expand the threads and lock it in place (days before locktite?). They come in both steel and aluminum for both sizes.

This makes removal extremely difficult, and I find a high percentage seized. I can usually remove them by drilling a hole from the front, Then using a standard butstock screw driver, but since its very difficult to get the lower fixtured without crushing anything, I usually have to replace the para bolt. I turn them out of cut-off barrel sections - like 10/22 heavy barrels at .920 OD


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Old February 15, 2006, 03:59   #35
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where can you find a 19/32x36 tap and die?
thanks
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Old February 15, 2006, 10:40   #36
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I had mine custom ground - couldn't find off the shelf.
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Old February 15, 2006, 19:12   #37
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Quote:
Originally posted by gunplumber
I had mine custom ground - couldn't find off the shelf.
Not the answer I was hoping for, but thank you for the response.
I wanted to make a different length gas tube and don't have threading capability on my lathe.
Guess I will have to resort to the bandsaw and MIG.
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Old April 17, 2006, 16:14   #38
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Unless I've missed it I haven't seen the threads for the gas regulator on here. I actually need what they are for the gas block where the regulator screws on. Anyone?

Thanks,
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Old May 20, 2006, 21:11   #39
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If all the fasteners and the barrel are threaded in SAE format why the heck is the gun a "metric" FAL ? Does that not seem a bit silly?
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Old April 10, 2007, 16:42   #40
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Quote:
Originally posted by Bigger_Is_Better
Unless I've missed it I haven't seen the threads for the gas regulator on here. I actually need what they are for the gas block where the regulator screws on. Anyone?
I would find this helpful, too.
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Old April 12, 2007, 10:45   #41
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11/16" by 24 tpi
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Old July 22, 2007, 00:41   #42
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L1A1 muzzle break thread

Hi Guys: Just bought a muzzle break for my L1A1. Was advised that it was THE correct one for my rifle but that they were not that common so my plan to simply slot the tube, drill the major diameter a little deeper and tap the pin hole to pull the sleeve tight may not be the best choice of action. My next plan was to buy the appropriate die and thread the muzzle using my angle plate V slot on my drill press and use the spindle to guide the die straight on to th barrel. The barrel OD. is 0.685, if the thread is actually a 9/16 x 24 , then I must assume that the barrel must be removed and turned to the major OD. for 9/16 (0.5325 dia.) x 24 (preferably between centers)and threaded. I will need the rest of the specs (pin size, thread length, tolerances,flat at the bottom of the minor OD, depth, fit, I assume that these are 60 degree V threads), instructions and access to disassembly, etc.) and access to a lathe.
In addition all of these 0/32 threads have me puzzled as I have been a machinist for 25 plus years and have never heard of them. It is a very very BIGGGG world. Please advise.

Later

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Old March 19, 2008, 21:55   #43
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Quote:
cross screw for mag release and BHO. 10/32
Is that a #10 x 32 tpi?
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Old March 20, 2008, 17:53   #44
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Quote:
Originally posted by zb-30


Is that a #10 x 32 tpi?
Yes, it is.
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Old March 20, 2008, 19:21   #45
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Old July 12, 2009, 10:10   #46
Legendre
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Quote:
Originally posted by gunplumber


They (Ed: paratrooper stock bolts) are both slit in a cross and threaded internally for a screw (#12x32, same as a metric front sight) with a tapered head. The tapered head will expand the threads and lock it in place (days before locktite?).
This comment got me thinking, so I did a little research.

Loctite was invented in 1953 (coincidentally, the year that the FAL went into service in Belgium) and was commercially available by the mid-1950s during the period when the FAL was being more widely adopted. So, it would appear that Loctite may in fact have been available to the engineers and armorers of that time.

I'd suspect that the design rationale behind the split-screw are twofold:

1) Anti-rotation (obvious)

2) Manufacturing expedient to eliminate the need for a special threadform or very precise class-of-fit for this highly critical fastener. In short, not only must we prevent rotation, we must prevent any side-to-side movement which could very quickly lead to wear and rapid failure of the joint.

The split bolt / jamb screw arrangement covers both of these needs very well.

-L
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Old July 14, 2009, 14:36   #47
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Quote:
Originally posted by Legendre


This comment got me thinking, so I did a little research.

Loctite was invented in 1953 (coincidentally, the year that the FAL went into service in Belgium) and was commercially available by the mid-1950s during the period when the FAL was being more widely adopted. So, it would appear that Loctite may in fact have been available to the engineers and armorers of that time.

-L
Not to argue, but just because it was available in the US doesn't mean it was available in Europe. Moreover, as it was only a few years old, it might have been hard to convince those old-school gunsmiths to use a newfangled "glue" on their gun, esp when they had tried-and-true methods.

It's not like gunsmiths are a cranky, set-in-their-ways lot or anything
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Old December 30, 2009, 12:26   #48
ruarmed
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heres all the info in one slot

fal
-------------------------------------
Technical: Thread Pitch- A permanent guide (submit changes)
bbl to receiver: 1"x 16tpi, inch and metric; Israeli, metric thread, chase with 1"x16 die.

cross screw for mag release and BHO. 10/32

pistol grip stud/nut 1/4x28 tpi (metric)

inner threaded hole on buttstock double threaded nut (the one that retains the recoil springs) 1/4x28 tpi (all types)

frame lock lever retaining screw (the little one in the back that keeps the lever in) 10/32

handguard screw
It's an 1-1/4" long 10-32 Screw!

Metric FAL Muzzle Threads 9/16-24 L.H.

L1A1 Pistol Grip Screw is a 1/4-28 slotted round head screw 1-1/4" long and uses a lock washer.

Stg-58 rear Sight Screw(s) US 8-36 x 9/16" long

Gas Tube Pin .078" Dia. x 13/32" long (Hint White Painted Coat Hangers are the Right Dia.)

Gas Tube Nut thread size US 9/16-24 R.H.


Metric Front Sight Pin thread US #12-28

Pivot bolt. 1/4x32

Gas block interior, metric and inch 17/32 x 36
Gas tube exterior thread, metric and inch 17/32 x 36
gas tube Rear support, metric and inch 9/16 x 24
Commonwealth front sight #10x40
Return spring tube cap, inside, metric and inch ¼ x 28
Front sling swivel screw and rear sight windage screws #8x40
StG front sight (some variations) #12 (7/32) x 28
Israeli HBAR coupler and muzzle 11/16 x 24
Belgium Long flash suppressor screw (.335" long, .192" slot head) # 8x40

L1A1 wooden grip that holds on the the popcycle stick it's a #8-36 SAE Screw
L1A1 Pistol Grip Screw is a 1/4-28 slotted round head screw 1-1/4" long and uses a lock washer.

hex/allen head screw is also correct. Designation is UNF2A 1/4"x1-1/4". The washer is replaced with "Washer, lock, steel, flat, internal teeth, 1/4" ID x15/32 OD x .026" and goes between the head and the other washer - BA steel #0

inch but screws are 2.5" for extra Long and Long (EL, L) 2" for medium (M), and 1.5" for short (S)

angle of commonwealth front sight is 5 degrees forward

If Ironwood L1A1 then the size is 1/4" x 20 1 1/4"

Rear sight windage screws for both Metric and L1 are 8/36, not 8/40
Co incidentally, the same as AR15 front sight

The pistol grip stud thread and the internal thread on the return spring tube nut (for the screw that holds the butt plate on the wooden stock) on the G1 lower I got from Tapco is 6x1mm. Six mm diameter by 1.0mm thread pitch.
A 1/4-28 UNF nut will screw onto a 6mm stud or screw but it will be quite sloppy.
A 1/4-28 UNF screw will NOT go into a 6mm nut.
The outside diameter of the 6mm fastener is about .015 inch smaller than the 1/4 inch fastener.

Either you have an anomoly or you are measuring incorrectly. the correct size for both on a G1 is 1/4x28 and I have 50 of them here of which I spot-checked ten. all are eaxactly 1/4x28, although a few are dented so threads need to be chased for smooth joining

got hold of a set of thread pitch gauges and checked again and the threads are 1/4-28

gas tube male thread and gas block female thread, both metric and inch 17/32 x 36.

Recoil spring tube male thread is also 17/32x36. The internal, female thread on a recoil spring tube (and the male thread on the plug) is smalle - 15/32x36.

I had to make new screws for the bipod that came on the G1 front end.
Thread is 5/16-24 UNF.

L1A1 Muzzle Threads 9/16x24 RH

the metric hinge pin is 1/4 x 32

the INCH hinge pin is 1/4 x 28

Anybody have the para bolt thread pitch? The bolt that holds the hinge assembly to the lower? It looks like 5/8 inch by 36 tpi. I need to chase some threads.

There are two, which is the cause for some confusion. The smaller one is a para lower made from a standard lower. That is, 17/32x36, which is the same as a recoil spring tube male thread. The other is a dedicated para lower and is 9/16x32.

They are both slit in a cross and threaded internally for a screw (#12x32, same as a metric front sight) with a tapered head. The tapered head will expand the threads and lock it in place (days before locktite?). They come in both steel and aluminum for both sizes.

This makes removal extremely difficult, and I find a high percentage seized. I can usually remove them by drilling a hole from the front, Then using a standard butstock screw driver, but since its very difficult to get the lower fixtured without crushing anything, I usually have to replace the para bolt. I turn them out of cut-off barrel sections - like 10/22 heavy barrels at .920 OD

gas block where the regulator screws 11/16" by 24 tpi

Hi Guys: Just bought a muzzle break for my L1A1. Was advised that it was THE correct one for my rifle but that they were not that common so my plan to simply slot the tube, drill the major diameter a little deeper and tap the pin hole to pull the sleeve tight may not be the best choice of action. My next plan was to buy the appropriate die and thread the muzzle using my angle plate V slot on my drill press and use the spindle to guide the die straight on to th barrel. The barrel OD. is 0.685, if the thread is actually a 9/16 x 24 , then I must assume that the barrel must be removed and turned to the major OD. for 9/16 (0.5325 dia.) x 24 (preferably between centers)and threaded. I will need the rest of the specs (pin size, thread length, tolerances,flat at the bottom of the minor OD, depth, fit, I assume that these are 60 degree V threads), instructions and access to disassembly, etc.) and access to a lathe.
In addition all of these 0/32 threads have me puzzled as I have been a machinist for 25 plus years and have never heard of them. It is a very very BIGGGG world

cross screw for mag release and BHO. 10/32 Is that a #10 x 32 tpi?
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Old August 31, 2010, 07:36   #49
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need thread pitch of DSA scope mount
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Old August 31, 2010, 17:55   #50
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RU...the 0-32's are two different forms ...youll have a cut thread and a roll or "express" tap

two different critters ..and two different pilot drills ....make sure ya get the right one or youll be ska rude
measure the minor id ...one should be 141 the other 170 or so ...iirc

Last edited by ggiilliiee; September 03, 2010 at 12:56.
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