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Gunsmithing Threads,,,The Screw Type That Is




NYECOGunsmith

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#1
One of you, who shall remain nameless, asked awhile back if if I had any notes on the various threads (machine screw type) used on barrels, both for threading them into the receiver, or for screwing on devices on the muzzle.

Well, it was a ways back down the road that he asked, and quite frankly, I forgot about it (I'm old, get over it!), but I stumbled across a few of my notes on that subject, and after brushing the dust off the clay tablets and relearning Sumerian Cuneiform writing, I managed to put them into some semblance of order.

These are the ones I found, I know that somewhere I have more, as I worked on a lot more guns than just the types/models listed here over the last 58 years. When I find them, I will add them to the list. If any of you have figures such as these that are not on my lists, please add them to the thread.

As always, if you spot any typos or info you know to be wrong, please don't hesitate to ridicule me in public if you see me, and of course here on the forum, and drop me a note so I can correct the misinformation ASAP. :smilielol5:

At the bottom of the info on threads I included a note about Firing Pin Protrusions, it was tucked in with my original notes on the screw threads, go figure.

For the non machinists here, the symbol "Ø" means "Diameter".



Pistol, Rifle and Shotgun Barrel Thread Dimensions

PISTOLS

Colt Revolvers

The OLD model Python and other Colt E & I frame guns used .5634” Ø by 32 TPI “V” threads.

The Colt J, V, and AA Mark III/King Cobra used .5620” Ø by 36 TPI “V” threads.

Measure the diameter, they do vary a bit from year to year, but the thread counts stay the same. All are right hand, 60° “V” threads.
Colt Python (new) 32 TPI
Colt Trooper (J, V & AA) 36 TPI
Colt SAA (Old Model) 20 TPI
CoIt SAA (New Model) 24 TPI
Colt 1917 20 TPI

Remington Single Shot “Navy” Action Pistol
.850” Ø , by 12 TPI SQUARE threads, Right Hand.

Ruger Revolvers

Ruger “Six” Series 24 TPI
Ruger GP-100R 24 TPI
Ruger RedhawkR 20 TPI
Ruger BlackhawkR 24 TPI

Smith and Wesson Revolvers

S&W J Frames 36 TPI
S&W K Frames 36 TPI
S&W L Frames 36 TPI
S&W N Frames 36 TPI

RIFLES

Browning Rifles:
The Browning BPCR and maybe all the Browning 1885's, are .935" outside diameter, shank length is .920" and the threads are 20 per inch with a standard 60 degree form.

Similar to the Winchester 1885 except the Browning uses 20 threads per inch instead of 16 per inch as does the Winchester.


Browning A-bolt Bolt Action Rifles
Old style threads are .9375” Ø by 20 TPI 60° V threads.
New style is 1” Ø by 32 TPI 60° V threads

CZ Rifles
BBK-02 1.1” Ø by 12 TPI 60° V threads.
CZ 550 1.1” Ø by 12 TPI 60° V threads.
CZ 557 1.1” Ø by 12 TPI 60° V threads.

Enfield Eddystone Model of 1917
Barrel threads are 1.125” Ø with 10 SQUARE T.P.I. that are .020” deep, length of barrel threads is .800 inch also stated as 1.125"x10, square threads. NOT “V” Form Threads!

Enfield SMLE
.687" Ø +.100 lip stepped up to .900" Root Ø x .997" Major Ø by 14 TPI “V” threads.

Enfield P-14 -
.720"L +.045"Lip x 1.085" Root Ø X 1.125" Ø X 10 SQUARE TPI.

Enfield 1917 -
.800" long shank x 1.085" Root Ø x 1.125" Major Ø x 10 SQUARE TPI with a 45-degree chamber cone.

Farquharson Actions
.987” Ø by 14 TPI “V” threads, .875 “ long shanks. Some are 55° threads, some are 60° threads, measure the thread angle!

Japanese Type 38 6.5 mm
1.0175” Ø by 14 TPI -60° “V” type threads , shank is .720” long.

Lee-Enfield Rifles
.997” Ø by 14 TPI , some are 60° “V” thread, some are 55°, measure it!

Manlicher Rifles
Model 95 1.063” Ø by 12 TPI , 60° “V” threads, shank is .960” long.

Manlicher-Schoenaur
1.060” Ø by 12 TPI , 60° “V” threads, shank is ..720” long.

Marlin Rifles

Marlin 336 .775” Ø by 12 TPI SQUARE Threads barrel shank is .850” long

Marlin 1895 45-70 same as 336, in .450 Marlin Caliber they may have been changed to a “V” thread. Not Sure of this, however.

Martini Actions

Large Martini action has a 1” Ø by 14 TPI V Thread , some are 60°, some are 55° so measure the angle! All have shanks that appear to be approximately .750” long.


Mauser Rifles

Large Ring Mauser 1.100” Ø by 12 TPI , 60° “V” threads, shank is .625” long.

Small Ring Mauser , G33-G40 .980” Ø by 12 TPI , 60° “V” threads, shank is .625” long.

Turkish Mauser model 1938 usually has 1.1” Ø by 12 TPI 55 Degree thread angle “V” threads, I have found 11.5 TPI “V” threads at 55° on some 1938 Turk Mauser barrels.

All other Mauser models such as the: 71/84,1888,1889,1891,1894,1895,1896,1898 Large and Small ring also FN single shot Mauser actions have 12 pitch sharp V 60° threads.

Siamese Mausers may be an exception. I have seen them with several different thread styles, when in doubt, measure it!

Most military Mauser barrels removed from actions will have distorted threads if they are the original barrel and the barrel has never been off the action. They will need cleaning up in order to fit another action, or if being put back on the original action, you should clean up the barrel threads and the receiver threads.

Mosin Nagant

All Models have either a .970” Ø by 16 TPI 60° V thread or a 1” Ø by 16 TPI 60° V thread, depending on year and location of manufacture. Measure them!

Mossberg Rifles

Mossberg MVP .223 has a small shank, .875” Ø by 28 TPI 60° “V” threads.

Norinco

Norinco clone of the Winchester Model 1887 lever shotgun in 12 ga., 1.1” Ø by 26 TPI “V “ threads.

Norwegian-Krag- Jorgensen Rifles
1.056” Ø by 12 TPI SQUARE LEFT HAND threads.

Remington Rifles

Model 721- 1.050” Ø by 16 TPI -60° “V” threads with a shank .513” long.

Model 722 - 1.050” Ø by 16 TPI -60° “V” threads with a shank .700” long

Model 788 Remington 788- 1″ Ø by 20 TPI - 60° "V" threads with a shank 1.50" long

All others, to the best of my knowledge, (modern manufacture bolt actions I mean!) such as the Model 700 are 1.0625” Ø by 16 TPI – 60° “V” threads with shanks that are normally .885” long.

Rolling Block No. 1 smokeless 1.055” Ø by 12 TPI SQUARE Threads , shank is 1.43” long.


Ruger Rifles
Ruger 10-22 set up with threaded barrel, the shank is .750” Ø by 16 TPI 60° “V” threads.

Ruger 77 1” Ø by 16 TPI 60° V Threads by 1.41” long shank.

Ruger No. 1 1” Ø by 16 TPI 60° V Threads by 1.41” long shank.

Sako Rifles

Sako – Model #
L46 =.855"Ø by 16 TPI -60° “V” threads, shank is .845" Long
L57 = .984" Ø by 16 TPI -60° “V” threads, shank is .845" Long
L579 & early L61 = 1.0" Ø by x 16 -60° “V” threads, shank is .870" Long.
Late L61 = Same as L579, but 1.046" Ø at the threads.
Sako's Tikka T3 1.0" Ø by x 16 -60° “V” threads, shank is .870" Long.

Savage Rifles

Model 99 Take Down .900” Ø 12 TPI SQUARE thread .035” deep , although I have seen some that were only .896” Ø so measure them!

Model 99 Fixed (non take down version)
.825” Ø 12 TPI SQUARE thread .035” deep by .937” long shank.

Savage 110 made prior to 2001 1.05” Ø by 20 TPI -60° “:V” threads.
Short magnum made after 2001 had 1.125” Ø by 20 TPI – 60° “V” threads, and in the “G” series, there is a noticeable step after threads.

CRF 1.0625” Ø by 20 TPI – 60° “V” threads.

Sharps-Borchardt Rifle
.945” Ø by 16 TPI , 60° “V” threads, shank is 1.140” long.


Springfield 1903 Rifle


1.040” Ø (-.002”, +.000”, per original blue prints) 10 TPI SQUARE threads, .051” wide (=.002”, -.000”) 100 lead, .734” (+.002”, -.000”) long shank.


Stevens Ideal Rifles

Model 44 is a .875” Ø by 16 TPI , 60° “V” type thread, shank is 1.4375” long

Model 44-1/2 .8125” Ø by 20 TPI , 60° “V” type thread, shank is 1.4375” long

Steyr Rifles

Steyr M-95 1.020” Ø by 14 TPI, 60° “V” thread, shank is .693” long.

U.S. Krag-Jorgensen Rifles
.980” Ø by 10 SQUARE TPI , .020” deep, shank is .750” long.

Weatherby Rifles

Weatherby mk V 1.0625 by 16 TPI – 60° “V” thread.

Winchester Rifles

#1 and #2 Single shots, .825” Ø by 16 TPI, 60° “V” threads.

#3 Single Shot Heavy Action , .935” Ø by 16 TPI , 60° “V” threads.

Model 52- .746” Ø by 20 TPI , 60° “V” threads, shank is .730” long.

Model 54 – 1.000” Ø by 16 TPI , 60° “V” threads, .0203” deep, shank is .740” long.

Model 70– 1.000” Ø by 16 TPI , 60° “V” threads, .0203” deep, shank is .740” long.

Model 92- .8125” Ø by 20 TPI , 60° “V” threads, shank is .625” long.

Model 94- .809” Ø by 20 TPI 60° “V” threads, shank is .504” long.

Model 95- .930” Ø by 16 60° “V” threads, shank is .875” long.

SHOTGUNS

Savage Shotguns

Savage Bolt Action Shotguns
1.1” Ø by 20 TPI, 60° “V” threads.


Common Rifle Muzzle Threads​

RIFLE CALIBER---- THREAD SIZE (Diameter x TPI)
All are 60° “V” type threads.

AR-15, M-16, AR-180 .223 (5.56mm) 1/2x28
AR-15, M-16, AR-180 9mm 1/2x36
Ruger Mini 14 (blue) .223 (5.56mm) 9/16x24
Ruger Mini (stainless) .223 (5.56mm) 9/16x24
Ruger Mini 30 (blue, stl) 7.62x39 5/8x24
HK-91/ G-3 308/ 7.62 15x1mm
HK-93/ 33/ G-53 .223 (5.56mm) 15x1mm
HK-94/ MP-5 9mm 9/16x24
US M1/M2 Carbine 30 9/16x24
FN-FAL US Match 308 (7.62) 9/16x24
FN-FAL Para/ SAR-48 308 (7.62) 9/16x24
FN Heavy Barrel 308 (7.62) 11/16x24
STEYER AUG .223 (5.56) 13x1mm LH
AKM/ AK-47 0.223 14x1mm LH
AKM/ AK-47 7.62x39 14x1mm LH
GALIL 308 (7.62) 13x1mm RH
GALIL .223 (5.56) 13x1mm RH
UZI Carbine/ SMG 9mm 5/8x24
M1A/ M-14 308 5/8x24
L1-A1 308 9/16x24
MAS 1949-56 308 17x1mm RH
Japanese Type 99 Arisaka is approximately 1.050 inches by 17.3 TPI V thread in the Imperial (SAE) system, in metric it is about 27mm x 1.5mm.
Type 38 and type 44 use a 1.020” by 14 TPI Imperial (SAE) thread.





Common Firing Pin Protrusions

.22 Rim Fire
Minimum .043”
Maximum .046”

Center Fire Rifle Cartridges Using Large Rifle Primers
Minimum .062”
Maximum .066”

Center Fire Rifle Cartridges Using Small Rifle Primers
Minimum .060”
Maximum .064”

Center Fire Pistol Cartridges ,Large or Small Primers
Minimum .050”
Maximum .060”

Shotguns (209 Primers)
Minimum .050”
Maximum .055”

Old Timer's Rule Of Thumb was to make the firing pin protrusion equal to the radius of the nose of the firing pin, if you had nothing else to go by. Generally always worked, except when it didn't! But I don't remember that trick ever not working.
 

Vegas50

1 Mile Shot Club
#2
Thank you Yoda!

Remington 788- 1″, 1.50" long and is threaded 20 tpi. (if i recall correctly)



Sako's Tikka T3 line falls under this one- L579 & early L61 = 1.0" Ø by x 16 -60° “V” threads, shank is .870" Long.

That's about all I can add to the list at this time.
 

NYECOGunsmith

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#3
Thank you Yoda!

Remington 788- 1″, 1.50" long and is threaded 20 tpi. (if i recall correctly)



Sako's Tikka T3 line falls under this one- L579 & early L61 = 1.0" Ø by x 16 -60° “V” threads, shank is .870" Long.

That's about all I can add to the list at this time.
Thanks Dane, I added your info to the above list.
 

NYECOGunsmith

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#4
Should anyone be interested, here's a video, nearly an hour long, on screws and threads, and in the comments below the video are links to other videos in his series that go into even more detail on screws, threads, threading.

 

NYECOGunsmith

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#5
Here are the other links and videos in the series in a list.

More information about the video, more episodes to watch and to donate, visit https://www.timhunkin.com/a241_compon... CHAPTERS 0:00 - Start 02:59 - Screw tapping 07:36 - Die cutting 10:02 - Screw cutting lathes 11:28 - Screw originating 16:48 - Thread standards 19:19 - Bolt heads 21:10 - Bolt varieties 25:32 - Torque 30:41 - Countersinking 33:52 - Stripped threads 38:35 - Wood screws 41:19 - Self tappers 43:39 - Castle threads 44:59 - Precision threads 46:42 - Bolted frames 51:04 - Bolt extraction

 

RobF

uber n00b
#7
The guy in that video, Tim Hunkin, is amazing. Informative and entertaining. Super creative - check out the machines he makes. His "components" series covers many different topics - bearings and springs are two I can remember. If you like making things, this is must-watch stuff.