In firearms, barrel threads refer to the screw threads used to attach a barrel.

Action threads, also called receiver threads, are situated at the chamber end of the barrel, and can be used for attaching the barrel to the receiver. The receiver normally has corresponding threads which are internal, with the matching action threads on the barrel usually being external threads. This design is most commonly used in rifles and revolvers, but also on some pistols and shotguns. This method of fixing a barrel to a receiver has been used extensively by firearms manufacturers since before the 20th century,^{[citation needed]} and can be viewed as a traditional barrel mounting method. Action threads are not the only method of fixing a barrel to a receiver (see Alternative methods below). Furthermore, recoil-operated firearm designs have moving barrels (e.g. most pistols or the Barrett M82 rifle).

Muzzle threads are situated at the muzzle end of the barrel and can be used for mounting accessories such as a flash hider, suppressor or muzzle brake (compensator).

Designation

There are many systems for designating thread types (metric, unified, Whitworth, etc.). Threading can be specified by diameter, pitch, angle, length and fit tolerances. However, the use of action threads is not well standardized within the firearms industry, and threading can vary between manufacturers and models.

For example, factory and aftermarket receivers using the Remington 700 footprint are produced with various types of action threads, all with a 26.99 mm (1+1⁄16 in) diameter, but with a pitch of either a 1.588 mm (16 TPI, Remington standard), 1.411 mm (18 TPI) or 1.270 mm (20 TPI, Savage standard).^[1]

Typically, many rifles use thread diameters in the range between 25–27 mm (0.98–1.06 in).^{[citation needed]} Many older rifles from the first half of the 20th century use a thread pitch around 2 mm (12.7 TPI), while many modern rifle use thread pitches around 1.5 mm (16.93 TPI). Fine threaded systems intended for hand tightening typically use thread pitches around 1 mm (25.4 TPI).^{[citation needed]}

Mounting

Using action threads to mount a barrel to a receiver typically requires fitting by a competent gunsmith, and typically some machining has to be done.

In this process it is important so set the correct headspace.^[2] Correct mounting is important both for safety and accuracy.^[3] If the barrel, receiver and bolt are not fitted properly, severe and potential fatal problems can arise due to faulty headspace, e.g. cartridge overpressure and case rupture. Threaded barrels are often mounted to the receiver with a lot of torque, and will therefore generally require tools for assembly and disassembly, such as a suitable action wrench and a vise. Depending on the firearm, a recoil lug is sometimes fitted between the barrel and stock as part of the process,

Cleaning up the receiver and barrel action threads is often done during "blueprinting" in order to increase accuracy.^[4]

Action threads

List of action threads

• M designates common V threads (like for instance metric threads)
• Sq designates square threads
• Tr designates trapezoidal threads
• The shank length is not always the same at the thread length, which is the case if the insert has a threadless portion (sub-shank)
• Tenon designates the thread length
• Shoulder designates the barrel diameter in front of the thread portion
• Unless otherwise mentioned, right hand threads are assumed. Left hand threads are designated "LH".

Zdroj:https://en.wikipedia.org?pojem=Barrel_threads
Text je dostupný za podmienok Creative Commons Attribution/Share-Alike License 3.0 Unported; prípadne za ďalších podmienok. Podrobnejšie informácie nájdete na stránke Podmienky použitia.

---



---

www.astronomia.sk | www.biologia.sk | www.botanika.sk | www.dejiny.sk | www.economy.sk | www.elektrotechnika.sk | www.estetika.sk | www.farmakologia.sk | www.filozofia.sk | Fyzika | www.futurologia.sk | www.genetika.sk | www.chemia.sk | www.lingvistika.sk | www.politologia.sk | www.psychologia.sk | www.sexuologia.sk | www.sociologia.sk | www.veda.sk I www.zoologia.sk

---

Model	Diameter (mm)	Pitch (mm)	Thread angle	Shank length	Comment	Inch
Smith & Wesson J Frame	M12.70	0.706 mm	60°		Also written as 0.500"-36	1/2"-36
Smith & Wesson K Frame	M13.72	0.706 mm	60°		Also written as 0.540"-36	69/128"-36
Smith & Wesson L Frame, Colt J, V, Colt AA Mark III / King Cobra, Colt Python (new), Colt Trooper (J, V, AA)	M14.27	0.706 mm	60°		Also written as 0.562"-36	9/16"-36
Colt Python (old), Colt E & I	M14.31	0.794 mm	60°		Also written as 0.5634"-32	9/16"-32
Destroyer 1921 carbine (Spanish)[5]	M15.88	0.977 mm	60°	15.88 mm	21.59 mm diameter at the shoulder	5/8"-26
Ruger GP-100	M15.88	1.058 mm	60°			5/8"-24
Remington Rolling Block No. 4 Rem. Action (solid frame model)[6]: 33	M16.64	1.588 mm	90°	16.89 mm	Also written as 0.655"-16.	21/32"-16
Mathieu[5]	Tr16.76	2.54 mm	29°	16.76 mm	Trapezoidal threads. Also written as 0.660"-20	85/128"-20
Ruger Blackhawk	M16.97	1.058 mm	60°		Also written as 0.668"-24	43/64"-24
Smith & Wesson N Frame	M17.02	0.706 mm	60°		Also written as 0.670"-36	43/64"-36
Remington Rolling Block No. 4 Rem. Action (takedown model)[6]: 33	⌀17.15	(no threads)	N/A	17.02 mm*	Also written as 0.675". *Of which a length of 5.56 mm of the shank has its diameter reduced to 15.62 mm.	27/40"
Ruger Single Six series	M17.26	1.058 mm	60°			87/128"-24
Colt Single Action Army Revolver (third gen)[7]	M17.35	1.058 mm	60°	17.75 mm	Also written as 0.683"-24. Only 14.43 mm of the shank is threaded.	87/128"-24
Colt Single Action Army Revolver (first and second gen)[7]	M17.65	1.270 mm	60°	17.75 mm	Also written as 0.695"-20. Only 14.73 mm of the shank is threaded.	89/128"-20
M1917 revolver	M17.65	1.270 mm	60°		Also written as 0.695"-20	89/128"-20
Ruger Redhawk	M19.05	1.270 mm	60°			3/4"-20
Falling Block Works (FBW) Model K [6]: 68	M19.05	1.588 mm	60°	25.15 mm		3/4"-16
Stiller SPF 2500X[8]	M19.05	1.588 mm	60°			3/4"-16
BSA Martini Cadet[9][6]: 53	M19.05	1.814 mm	55°	16.74 mm	Maximum 25.40 mm shoulder	3/4"-14
Marlin 336, 1895 (.45-70)	Sq19.69	2.117 mm	90°	21.59 mm	Square threads	0.775"-12
Marlin 1895 (.450)	M19.69	2.117 mm	60°	21.59 mm		0.775"-12
Ruger Mini-14	M20.64	1.270 mm	60°			13/16"-20
Colt AR-15	M20.64	1.588 mm	60°		The barrel nut thread is M31.75 x 1.411 mm (1-1/4"-18)	13/16"-16
HK416, HK MR223, HK MR556	M21	1.5 mm	60°		The barrel nut thread is M32 x 1.5 mm (1.26"-16.93)[citation needed]	0.827"-16.93
Remington Rolling Block No. 2 Rem. Action[6]: 33	Sq21.59	2.117 mm	90°	30.48 mm*	Square threads. Also written as 0.850"-12. *Of which a length of 10.16 mm of the shank has its diameter reduced to 20.45 mm	17/20"-12
Remington Rolling Block No. 1-1/2 Rem., Sporting Action[6]: 33	Sq21.59	2.117 mm	90°	36.65 mm*	Square threads. Also written as 0.850"-12. *Of which a length of 12.70 mm of the shank has its diameter reduced to 20.32 mm	17/20"-12
Remington 1867 Navy pistol	Sq21.59	2.117 mm	90°		Square threads. Also written as 0.850"-12.	17/20"-12
Kimber M/84	M21.43	1.27 mm	60°			27/32"-20
Sako L46/L-46[5]	M21.72	1.588 mm	60°	21.46 mm	Also written as 0.855"-16.	55/64"-16
Howa 1500 Mini Action[10]	M22	1.5 mm	60°
Zastava M85 «Mini Mauser»	M22	1.5 mm	60°			0.866"-16.93
Sako L461	M22	1.6 mm[citation needed]	60°	19.40 mm		0.864"-15.87
Mossberg MVP .223[10]	M22.23	0.907 mm	60°		Also written as 0.875"-28.	7/8"-28
Weatherby Mark V Varmint, Weatherby Mark V Varmintmaster[5]	M22.23	1.411 mm	60°	16.99 mm		7/8"-18
Cooper Model 22[11]	M22.23	1.588 mm	60°	16.26 mm		7/8"-16
Savage Model 1920	Sq22.86	2.117 mm	90°		Square threads. Also written as 0.900"-12.	29/32"-12
Browning BPCR, 1885[12]	M23.75	1.270 mm	60°	23.37 mm	Also written as 0.935"-20.	15/16"-20
Winchester 1885[6]: 20	M23.75	1.588 mm	60°	23.37 mm		15/16"-16
Browning A-Bolt (early),[13] Browning BBR[14], Remington 7600	M23.81	1.270 mm	60°			15/16"-20
TAP-174, TAP-375	M24	1.0 mm	60°	19.75±0.05 mm	27.50 mm shoulder	0.945"-25.4
Sako AI/A1[15] (PPC, Vixen)	M24	1.5 mm	60°			0.945"-16.93
Jalonen JJ-91[15]	M24	1.5 mm	60°			0.945"-16.93
Keppeler[15]	M24	1.5 mm	60°	18 mm		0.945"-16.93
Loppo 1,[15] Loppo 2[15]	M24	1.5 mm	60°	20 mm		0.945"-16.93
Remington Rolling Block No. 1 Rem., Blackpowder Action[6]: 33	Sq24.77	2.117 mm	90°	36.02 mm*	Square threads. Also written as 0.975"-12. *Of which a length of 10.62 mm of the shank has its diameter reduced to 23.37 mm	39/40"-12
Mosin-Nagant M91/30	M24.64, M24.77 M24.89	1.588 mm, 1.588 mm, 1.814 mm	55/60°	23.88 mm	30.02 mm shoulder. Thread angle varies.	0.970"-16, 0.975"-16,[16] 0.980"-14[5]
MAS M-1936[5]	M24.89	1.588 mm	60°	21.46 mm	Also written as 0.980"-16.	63/64"-16
Husqvarna 1640,	M24.89	2.117 mm	55°	18.16 mm	27.94 mm shoulder. Also written as 0.979"-12.	63/64"-12
Mauser small ring: Mauser G33/40,[5][17] Model 93, 94, 95[5] Swedish m/1896[5] and m/1938[18]	M25	2.117 mm	55°	18.16 mm / 16.38 mm / 15.88 mm / 16.2+0.2 mm	24.89 mm major diameter. 27.94 mm shoulder	0.980"-12,[19] 0.993"-12