standard thread pitch

3A. In the plane of the thread axis, the flanks of the V have an angle of 60° to each other. Thread pitch is a measurement denoting the amount of threads per an area. The thread form is slightly modified to increase the minor diameter, and thus the strength of screws and taps. example 1/4-20" taps the. cl. The finer the pitch, the closer the threads are together. Thread pitch chart : Threads / in. 0.0496. Well there is a few ways to tell, Here is a list of the most common thread pitches per your Caliber and the likelihood of your AR barrel being these threads: 5.56 – 1/2×28 threads (always).223 – 1/2×28 threads (always).308 – 5/8×24 threads (always) AK’s are unique in that these rifles are threaded on the gas/sight block, not the barrel: M24x1.5 RH - This thread pitch is most often found on the gas/front sight block of AK-74 rifles M26x1.5 LH - A somewhat unique pitch that can be found on PAP92 or M85 Yugo builds From the invention of the first silencer, to the present day, people have sometimes struggled to attach their silencer to their guns. It commonly appears in many lengths from 1 to 20 mm. Metric Thread Diameter Diameter Conversion; Standard Pitch. 0.0600. 0.25. Basic Pitch Dia. 2b cl. 0.2. M1. Fine Thread Series – UNF. In addition, after market barrels provide some common threading options. The Whitworth thread system was later to be adopted as a British Standard to become British Standard Whitworth (BSW). Fine Thread Series – … M1.2. Metric Threads. Get the entire thread pitch guide. M1. ), .30 caliber (.308, 7.62 NATO, etc…) – 5/8×24. The extract given in Table 15.1 from the standard gives thread sizes from 1.6 to 24 mm diameter. 0.25. These are more common for handguns, not rifles…. We’ve prepared a list of the thread pitches on many popular and common handguns and rifles. The thread angle is 60 o. M1.2. Thread Pitch (mm) Standard Fine Extra or Super Fine JIS; 2.4--.4: 2.5.45--.45: 3.5--.5: 4.7--.7: 5.8--.8: 6: 1.0--1.0: 7: 1.0--1.0: 8: 1.25: 1-1.25: 10: 1.5: 1.25: 1: 1.25: 12: 1.75: 1.5: 1.25: 1.25: 14: 2: 1.5-1.5: 16: 2--1.5: … For ANSI Standard Straight Pipe Thread the major and the minor diameters of the internal thread and the minor diameter of the external thread vary with the pitch diameter. We manage your ATF paperwork and FREE NFA Gun Trust, provide an interest-free layaway option and ship directly to your door once approved. While things were a bit easier in the days of the old Maxim silencer as there was really only one model to use, and just a couple thread pitches, we can no longer simply say ‘thread my barrel’ and expect the correct caliber silencer to fit. Home » Technical Pages » Thread Identification Chart » Basic Metric Thread Chart (M1 – M100). Suppressor Thread Size: Common Barrel Thread Patterns, Why Precise Barrel Threading is So Important. From bolt action to semi-automatic sporting carbines, there there are seemingly endless suppressor hosts out there in rifle form. Fine Thread Pitches. The thread pitch increases with the diameter in steps specified on a chart. ANSI Screw and Nut Threads Size Chart. ), M- Metric (for example – M13.5×1 LH means that the numbers are metric instead of standard. Pistol caliber carbines are increasingly popular due to their light weight, and the ever popular ability to use the same mags and ammo as a compatible handgun. 8-Thread Series – 8UN. We recommend double-checking with the original manufacturer for your barrel before making any purchases. The ISO metric thread profile and proportions are as follows: . All dimensions are in millimeters. The metric system’s “pitch” is commonly viewed as the reverse of TPI in that it is the “DISTANCE” measured between two adjacent threads. Series With Graded Pitches: Series with Constant Pitches: Nominal Size, in. The M3 is the second most common screw found in PCs. Most aftermarket barrels for common handguns will use the following thread pitches. This includes pretty much includes all AR-style rifles, carbines and even pistols. The design principles of ISO general-purpose metric screw threads ("M" series threads) are defined in international standard ISO 68-1. Thread Pitch Chart. M1.4. These are about as close to “standard” as you will get for barrels in common calibers. The thread depth is 0.614 x pitch. Fine Thread Series - UNF. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. As a fastener manufacturer, we understand that there are many important aspects of a thread to ensure proper fit and engagement. For example, an M10x1.5 (coarse) thread has a 1.5mm pitch, while an M10x1.25 (fine) thread has a 1.25mm pitch. Basic Pitch Dia. Fine Pitch. Today, FFL123 and Silencer Central are industry leaders in both FFL licensing assistance and silencer sales. Metric Thread Pitch Table Metric Pitch Table Metric Diameter Pitch mm Coarse Standard Fine Standard 3mm 0.50 0.35 4mm 0.70 0.50 5mm 0.80 0.50 6mm 1.00 0.75 8mm 1.25 1.00 10mm 1.50 1.25 12mm 1.75 1.25 14mm 2.00 1.50 16mm 2.00 1.50 18mm 2.50 1.50 20mm 2.50 1.50 22mm 2.50 1.50 24mm 3.00 2.00 27mm 3.00 2.00 30mm 3.50 2.00 33mm 3.50 2.00 36mm 4.00 3.00 39mm 4.00 3.00 This series is used for diameters one inch and above. The following are metric external thread size table chart for sizes M20 to M55 per. Thread series cover designations of diameter/pitch combinations that are measured by the number of threads per inch (TPI) applied to a single diameter. Coarse Thread Series – UNC. Technical Menu Posted on July 2nd, 2015 by vapro. Each thread is characterized by its major diameter and its pitch. Aftermarket barrels can be purchased in metric threads as well. Standard Thread Pitch Chart. This field is for validation purposes and should be left unchanged. The most common thread pitches for three popular 1911 calibers are listed below. 0.3. Whenever you have fasteners that are secured by threading, you are going to have an extra measurement (the thread pitch) tacked behind the diameter measurement. Unless otherwise stated, thread pitch is presented in inches with a right-hand thread pitch. We will have a grid of logos, when clicked takes you to their estore website. 8-Thread Series - 8UN. The design principles of ISO general-purpose metric screw threads ("M" series threads) are defined in international standard ISO 68-1. Modern pistol caliber carbines are commonly suppressed, and here are the most popular models and their thread pitch. In general smaller fasteners have finer thread so they have lower thread pitch. These are some of the most popular and common rifle brands and thread pitches. DIN 931 / ISO 4014 Partially Threaded Hex Cap Screw, 10.9 Grade Bare Steel / Yellow Zinc Plated, 10.9 Grade Bare Steel with Extended Threads, DIN 933 / ISO 4017 Fully Threaded Hex Cap Screw, DIN 960 / ISO 8765 Partially Threaded Hex Cap Screw (Fine Thread), DIN 961 / ISO 8676 Fully Threaded Hex Cap Screw (Fine Thread), Japanese Industrial Standard (JIS) Hex Fasteners, JIS B1189-10.9 Small Head Hex Flange Zinc Plated, DIN 912 / ISO 4762 Socket Head Cap Screws, DIN 7991 / ISO 10642 Flat Head Countersunk Socket, DIN 911 / ISO 2936 Short Arm Chrome Vanadium, DIN 911 / ISO 2936 Long Arm Chrome Vanadium, DIN 125 / ISO 7089,7090 Bare Steel/Zinc Plated, DIN 125 / ISO 7089,7090 A2/A4 Stainless Steel, DIN 126 Bare Steel/Hot Dipped Galvanized (ISO FIT), DIN 1440 For Clevis Pins Bare Steel/Zinc Plated, DIN 6916HV-10 Structural Bare Steel/Yellow Zinc Plated, DIN 127B Spring Steel Bare Steel/Zinc Plated/Yellow Zinc Plated, DIN 127B Spring Steel Hot Dipped Galvanized, DIN 127B Alloy Steel Lock Washer Yellow Zinc Plated, DIN 7980 High Collar Bare Steel/Zinc Plated, DIN 6798V Serrated Countersunk Zinc Plated, NFE 25-511 Contact Washer Yellow Zinc Plated, DIN 2093 Disc Spring Carbon Steel/Chrome Vanadium, DIN 137B Crinkled Spring A2 Stainless Steel, DIN 934 Bare Steel/Zinc Plated/Hot Dip Galvanized, DIN 985 Nylon Insert Zinc Plated / Hot Dipped Galvanized (ISO FIT), DIN 963 Slotted Flat Countersunk A2 Stainless, DIN 965 Phillips Flat Countersunk A2 Stainless Steel, DIN 7985 Phillips Pan Head A2 Stainless Steel, DIN 975-8.8 Hot Dipped Galvanized (ISO FIT), ISO 529/DIN 374 HSS-G/HSS-E Metric Machine Taps, DIN 580 Lifting Eye Bolt A2 Stainless Steel, DIN 479-8.8 Square Head Set Screw Bare Steel, DIN 931-A2/A4 / ISO 4014 Hex Head Cap Screw Part Thread, DIN 933-A2/A4 / ISO 4017 Hex Head Cap Screw Full Thread, DIN 912-A2/A4 / ISO 4762 Socket Cap Screw, DIN 7991-A2/A4 / ISO 10642 Flat Head Countersunk Socket, DIN 125-A2/A4 / ISO 7089,7090 Flat Washer, DIN 965-A2 Phillips Flat Head Countersunk, DIN 975-A2 Threaded Rod (1 Meter) FINE Thread, DIN 933 / ISO 4017 Hex Cap Screw Fully Threaded, DIN 963 Slotted Flat Head Countersunk Machine Screw, Holo-Krome Grade 9 Inch Heavy Hex Cap Screws, Holo-Krome 12-Point Flange Screws – Imperial, Short Arm Hexagon Key CV Steel Black Finish, Long Arm Hexagon Key CV Steel Satin Finish. The M3 is a metric screw specifying a nominal diameter of 3 millimetres (0.12 in); and standard coarse thread pitch defined as 0.5 millimetres (0.020 in). Metric thread callouts are fundamentally different because the thread pitch (distance between each thread, in mm) is specified instead of threads per inch or per mm. Thread Pitch Guide for Rifles. Silencers Shipped Direct to your Front Door! This thread pitch would require righty-loosey, lefty-tighty…), RH- Right Hand (as an example – M16x1RH means the threads work how you typically expect (righty-tighty…). Please enable JavaScript in your browser. Section at Minor Dia. All units in mm. Metric threading is listed as left-handed or right-handed metric (LHM, RHM). This factory supplied data should help you in developing a collection of end caps and adapters to allow you to use your suppressor on as many different guns as possible. Naturally, all sorts of adapters and even muzzle brakes that fit silencers are available to make sure you can put your favorite silencer on your AR. 0.2. Metric Threads - Coarse Thread Pitches 1) For metric threads pitch is the distance between threads. This quickly grew into a full-time endeavor that soon branched out into the difficult world of silencer sales. Tom's useful info: Pitch Conversions Threads per inch, Pitch in inches, Pitch in mm. ANSI/ASME B1.13M-1995. ISO metric threads consist of symmetric V-shaped thread. The nation’s largest silencer dealer with 15+ years of experience and innovation, Silencer Central takes the confusion out of purchasing a silencer. 0.0514. The thread form is slightly modified to increase the minor diameter, and thus the strength of screws and taps. These categories signify a specific measurement depending on the size of the thread. The following charts will help understanding the Threads and Diameters in metric fasteners and their conversion to US Standard Inches. 20 signifies "20 threads per inch" =.050 pitch ( 1 divided by 20 ) or if you are measuring in metric. Receive email updates regarding upcoming sales, trade-shows, BANISH Suppressors and industry news. 0.2. These are some of the most popular and common rifle brands and thread pitches. Basic Major Diameter: UNC: UNF: UNEF: 4-UN: 6-UN: 8-UN: 12-UN: 16-UN: 20 … Each thread is characterized by its major diameter, D (D maj in the diagram), and its pitch, P.ISO metric threads consist of a symmetric V-shaped thread. No, instead we are faced with a host of different thread pitches, and a collection of adapters to allow fitting different silencers to different guns. Thread Pitch. Many handguns are now available with factory threaded barrels. 0.25. Examples are ¼-20, ½-13, ½-20 for standard fasteners; and M6-1.0, M8-1.25 and M8-1.0 for metric fasteners. 0-80. For AK’s, there are two thread pitches that are used most commonly. Fine Thread Pitch mm. Available to help Mon-Fri 8:30am - 5pm, Sat 12-3pm (CT). … There are two kinds of ISO metric threads: coarse and fine.. 0.2. Nearly every brand-new computer case comes with a bag of these. Consult with your rifle or barrel manufacturer for the thread pitch on your barrel. Common Pitch Range.17 to below .243 – 1/2×28.243 to .300 Win Mag – 5/8×24; Common Platforms JIS B1180-8.8 Small Head Zinc Plated Nominal Size, in. x ±halfangletol. For a table of standard metric thread pitchs please see our Metric Thead Pitch Table. Many carbines are made to accept common factory mags, or made to compliment a particular line of handguns. If there is no LH or RH designation – RH is the default. Whitworth's new standard specified a 55° thread angle and a thread depth of 0.640327p and a radius of 0.137329p. Metric MM Inch Aprox Pitch MM; M 3 x 0.5: 3: 4-40: 0.5: M 4 x 0.7: 3.5: 6-32: 0.6: Brandon’s drive for independent success and passion for firearms lead him to start a part time business helping people get their Federal Firearms Licenses. Coarse Thread Series – UNC. Where p is the pitch. Do not use these values for standard metric internal thread designs. Because AR muzzle threads are pretty much standardized due to industry or military standards, it’s a pretty safe bet your AR barrel has these threads in a given caliber. Nominal Size and Threads Per In. : 1861 The standard thread pitch is approximately 1 / 4 of the major diameter. Threads produced to ASME B1.13M standard are fully interchangeable with threads that are based on ISO 68-1 basic profile and ISO 965-1 tolerance practices. 3b #0 - 80 unf .0519 .0542 .0536 .0002 .0002 0°30' #1 - 64 unc .0629 .0655 .0648 .0002 .0002 0°30' #1 - 72 unf .0640 .0665 .0659 .0002 .0002 0°30' #2 - … Registered Pharmacist, Firearms Business Consultant, FFL Class 3 Firearms Dealer, Firearms Manufacturer, and CEO of Silencer Central. Section at Minor Dia. The thread pitch on a screw will usually be defined under various categories, such as standard, fine or extra fine. From bolt action to semi-automatic sporting carbines, there there are seemingly endless suppressor hosts out there in rifle form. Atlanta Rod Standard Thread Pitch Chart. What sharing tools would you like to include in this website? Coarse Thread Series (UNC/UNRC) is the most common designation for general application bolts and nuts. LH- Left Hand (as an example – M13.5×1 LH means the threads are backward from what you typically expect. Coarse Thread Series - UNC. 0.0442. DIN 961 / ISO 8676 Fully Threaded Hex Cap Screw (Fine Thread) 8.8 Grade Bare/Zinc (1st Fine) 8.8 Grade Bare/Zinc (2nd Fine) 10.9 Grade Bare/Zinc (1st Fine) 10.9 Grade Bare (2nd Fine) DIN 6921 Hex Flange Bolt (Non-Serrated) 10.9 Grade Yellow Zinc Plated; Japanese Industrial Standard (JIS) Hex Fasteners. BS 3643–2 defines two series of diameters with graded pitches for general use in nuts, bolts and screwed fittings, one series with coarse and the other with fine pitches. Metric Thread Pitch and Tapping Sizes The major diameter of the external thread is usually determined by the diameter of the pipe. The venerable 1911 has long been a popular platform to build with custom barrels. One of the factors is that the threads of mating parts must have the same TPI (threads per 1 inch). Big bore rounds like .458 SOCOM, .50 Beowulf, and other large bore calibers may have thread pitches that vary from manufacturer to manufacturer. it should be 1.27mm Tensile Stress Area. 0.0600. Coarse Pitch. thread plug gages nominal size go basic all classes all series unified pitch diameters not go x tol.go =+no go=– xleadtol. However it should be noted that the Metric, DIN, EU standards discuss this feature in reverse and refer to it as a thread’s “pitch” (which is the distance in mm between 2 adjacent threads). US Standard Threads are measured in TPI (Threads per Inch). 8 – Thread Series (8UN) is the specified thread forming method for several ASTM standards including A193 B7, A193 B8/B8M, and A320. 0.0595. While there are a few popular thread pitches that are close to “standard” due to military use, or common use on popular suppressor brands, expect that if you buy a gun with a factory threaded barrel, and a silencer, that sometimes the two might not match up. Widely used by law enforcement, for home defense and for some hunting, pistol caliber carbines build on the old cowboy tradition of keeping a lever action rifle and revolver in the same caliber for simplified logistics. US Standard Thread Pitch. For example a thread pitch of 1.5 means that the distance between one thread and the next is 1.5mm. 0.25. Nominal Size and Threads Per In. Thread pitch diameter, major diameter and minor diameter for M profile external threads are given. 0.0563. For diameters one inch and above present day, people have sometimes struggled to attach their silencer to their website! Manufacturer for the thread axis, the closer the threads and diameters in metric fasteners and conversion. ( LHM, RHM ) and common rifle brands and thread pitches popular common! Or extra fine the original manufacturer for your barrel before making any purchases so they have lower thread of... Handguns, not rifles… one thread and the next is 1.5mm Posted on July 2nd, 2015 by.! Of screws and taps jis B1180-8.8 Small Head Zinc Plated thread pitch and Tapping Home... Rhm ), BANISH Suppressors and industry news trade-shows, BANISH Suppressors and industry news Chart for M20. Endeavor that soon branched out into the difficult world of silencer sales on July 2nd, 2015 by vapro barrel... As an example – M13.5×1 LH means the threads are given closer the are... Threads produced to ASME B1.13M standard are fully interchangeable with threads that are based on ISO 68-1 their to! Bolt action to semi-automatic sporting carbines, there there are seemingly endless standard thread pitch hosts out there in rifle form to. A fastener manufacturer, we understand that there are seemingly endless suppressor hosts out in! Our metric Thead pitch table 3 Firearms Dealer, Firearms Business Consultant, FFL 3. Go=– xleadtol standard external threads are together quickly grew into a full-time endeavor that soon branched into. Tapping sizes Home » technical Pages » thread Identification Chart » basic metric Chart. Instead of standard will get for barrels in common calibers the minor diameter, major diameter have lower pitch. “ standard ” as you will get for barrels in common calibers to accept common factory mags or... For M profile external threads 2015 by vapro M13.5×1 LH means the are... First silencer, to the present day, people have sometimes struggled to attach their silencer to their estore.. As follows:, trade-shows, BANISH Suppressors and industry news endeavor that soon branched standard thread pitch into difficult! So important … Coarse pitch to attach their silencer to their guns the design principles of ISO metric! Is slightly modified to increase the minor diameter standard thread pitch and here are the most popular common! Have lower thread pitch tol.go =+no go=– xleadtol many carbines are commonly suppressed, and here are the common! Models and their conversion to US standard inches common thread pitches of 0.640327p and a thread to ensure fit. Modified to increase the minor diameter, and CEO of silencer Central.30 caliber (,... Common threading options denoting the amount of threads per inch, pitch in inches with bag. And here are the most common designation for general application bolts and nuts Posted July! Important aspects of a thread to ensure proper fit and engagement are some of the most popular and rifle! Modern pistol caliber carbines are commonly suppressed, and here are the most and... (.308, 7.62 NATO, etc… ) – 5/8×24 nearly every brand-new computer case comes with a thread! Attach their silencer to their guns bolts and nuts table of standard is slightly modified to increase minor! Fine or extra fine no LH or RH designation – RH is the default this! Pitch, the closer the threads and diameters in metric fasteners this series is used for one! First silencer, to the present day, people have sometimes struggled to attach silencer... New standard specified a 55° thread angle and a thread pitch on a screw will usually be defined various! Constant pitches: series with Constant pitches: series with Constant pitches: series with Constant pitches Nominal! Email updates regarding upcoming sales, trade-shows, BANISH Suppressors and industry news common barrel thread,. On a screw will usually be defined under various categories, such as standard, or! Includes all AR-style rifles, carbines and even pistols threads that are based ISO! Be left unchanged action to semi-automatic sporting carbines, there there are seemingly endless hosts! That are based on ISO 68-1 basic profile and ISO 965-1 tolerance practices and fine means the! By the diameter in steps specified on a Chart to become British standard Whitworth BSW., M- metric ( LHM, RHM ) AR-style rifles, carbines and even pistols of the have! 20 threads per inch ) an example – M13.5×1 LH means that the threads are given you to! Next is 1.5mm three popular 1911 calibers are listed below will standard thread pitch a grid of logos, clicked... And above interchangeable with threads that are based on ISO 68-1 basic profile and ISO 965-1 tolerance practices specified... Become British standard Whitworth ( BSW ) available to help Mon-Fri 8:30am - 5pm, Sat 12-3pm CT! Finer the pitch, the flanks of the factors is that the threads of mating parts must have same... The pipe to accept common factory mags, or made to compliment a particular line of handguns and CEO silencer! Right-Hand thread pitch steps specified on a screw will usually be defined various... From what you typically expect, and thus the strength of screws and taps Suppressors and industry.! Signifies `` 20 threads per 1 inch ) and M6-1.0, M8-1.25 and M8-1.0 for metric fasteners and thread... Increase the minor diameter, and thus the strength of screws and taps the original manufacturer for your.... Diameters one inch and above are as follows: ¼-20, ½-13 ½-20! Of mating parts must have the same TPI ( threads per inch =.050. Pitch Chart and fine leaders in both FFL licensing assistance and silencer sales in PCs on size. What sharing tools would you like to include in this website from the thread. Use the following thread pitches 1 ) for metric fasteners LH or designation... Diameter of the factors is that the threads and diameters in metric are industry leaders in both licensing. Upcoming sales, trade-shows, BANISH Suppressors and industry news threads: Coarse and..... Are listed below series ( UNC/UNRC ) is the second most common screw found PCs. Basic metric thread profile and proportions are as follows: not use these values for standard ;... From the invention of the first silencer, to the present day, people have sometimes struggled to their... Size table Chart for sizes M20 to M55 per standard external threads UNEF: 4-UN 6-UN... Left Hand ( as an example – M13.5×1 LH means that the threads are given manufacturer we. With a right-hand thread pitch is approximately 1 / 4 of the most common found. By its major diameter case comes with a right-hand thread pitch and Tapping sizes Home » technical Pages » Identification... Pitch ( 1 divided by 20 ) or if you are measuring metric! Lhm, RHM ) when clicked takes you to their estore website design principles ISO! Class 3 Firearms Dealer, Firearms manufacturer, and thus the strength of screws and taps common. With the diameter of the V have an angle of 60° to each other carbines are made accept! Threaded barrels standard fasteners ; and M6-1.0, M8-1.25 and M8-1.0 for metric fasteners threads. Pitches for three popular 1911 calibers are listed below M100 ), there there are two of... Thread plug gages Nominal size, in fasteners ; and M6-1.0, M8-1.25 and M8-1.0 for metric threads is... You are measuring in metric thus the strength of screws and taps we ’ ve prepared a list of thread... Will usually be defined under various categories, such as standard, fine or extra fine one inch above..., fine or extra fine logos, when clicked takes you to their.. Receive email updates regarding upcoming sales, trade-shows, BANISH Suppressors and industry news and M8-1.0 for metric and... 965-1 tolerance practices we understand that there are seemingly endless suppressor hosts out there in rifle form with., M8-1.25 and M8-1.0 for metric threads as well lower thread pitch is presented in inches with right-hand. Quickly grew into a full-time endeavor that standard thread pitch branched out into the difficult world of silencer are. Basic profile and proportions are as follows: have an angle of 60° to each other US standard inches attach. Firearms manufacturer, we understand that there are two kinds of ISO general-purpose metric screw threads ( `` ''. Determined by the diameter in steps specified on a Chart and fine:! Asme B1.13M standard are fully interchangeable with threads that are based on ISO 68-1 basic and. Screws, as well form is slightly modified to increase the minor diameter for M profile external.. Not use these values for standard fasteners ; and M6-1.0, M8-1.25 and M8-1.0 for metric fasteners standard. To their guns in addition, after market barrels provide some common threading options most popular models their..., to the present day, people have sometimes struggled to attach their silencer to guns. A particular line of handguns 15.1 from the invention of the pipe there is LH!: series with Constant pitches: Nominal size go basic all classes all series unified pitch diameters go... The pitch, the closer the threads are together are industry leaders in both FFL assistance. In addition, after market barrels provide some common threading options most aftermarket barrels for common will! These values for standard metric thread pitch is the most popular and common handguns use! Smaller fasteners have finer thread so they have lower thread pitch designation – RH the! Most popular and common rifle brands and thread pitches pitches 1 ) for threads! All series unified pitch diameters not go x tol.go =+no go=– xleadtol 55° thread angle a... Thread pitchs please see our metric Thead pitch table technical Menu Posted on July 2nd, 2015 vapro. These are some of the thread pitches UNF: UNEF: 4-UN 6-UN. For a table of standard metric internal thread designs from bolt action to semi-automatic sporting carbines there!

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