Precision Gages

When it comes to measuring the accuracy and quality of Acme threads, ring gauges are an essential tool. Acme threads are a type of trapezoidal thread commonly used in various applications, including power transmission and linear motion systems. These threads have a unique design and require specific ring gauges for accurate measurement. In this blog article, we will discuss Acme thread ring gauges and help you determine which class of fit - 2G, 3G, or 4G - is most suitable for your needs.Acme thread ring gauges are used to check the external threads of bolts or the internal threads of nuts. They come in sets, typically consisting of a Go gauge and a No-Go gauge. The Go gauge ensures that the threads are within the specified tolerances, while the No-Go gauge checks for any excessive deviations.Now, let's explore the different classes of fit and how to determine which one to use:1. 2G Class of Fit:The 2G class of fit is the most common and widely used class for Acme threads. It provides a general-purpose fit that balances ease of assembly and disassembly with sufficient thread engagement. The 2G class is suitable for applications where a moderate level of precision is required, and the threads need to be easily assembled and disassembled.2. 3G Class of Fit:The 3G class of fit offers a tighter fit compared to the 2G class. It provides a closer tolerance and increased thread engagement, resulting in a more secure connection. The 3G class is suitable for applications where a higher level of precision is required, and the threads need to withstand greater loads or vibrations.3. 4G Class of Fit:The 4G class of fit is the tightest fit among the three classes. It offers the highest level of precision and thread engagement, ensuring a secure and reliable connection. The 4G class is suitable for applications where the utmost precision is required, such as in precision machinery or critical components that cannot tolerate any play or movement.To determine which class of fit to use, consider the specific requirements of your application. Factors to consider include the desired level of precision, the intended load or vibration conditions, and the industry standards or specifications. If you need a general-purpose fit with ease of assembly and disassembly, the 2G class is a suitable choice. If you require a tighter fit with increased precision and thread engagement, the 3G class may be more appropriate. For applications demanding the highest level of precision and minimal play, the 4G class is the best option.It is important to note that the selection of the class of fit should align with the relevant industry standards and specifications. Consult the appropriate standards or guidelines to ensure compliance and optimal performance.In conclusion, Acme thread ring gauges are essential for measuring the accuracy and quality of Acme threads. The choice of class of fit - 2G, 3G, or 4G - depends on the specific requirements of your application. Consider factors such as ease of assembly, precision, thread engagement, load or vibration conditions, and industry standards when selecting the appropriate class of fit. By using the right ring gauge, you can ensure the reliability and functionality of threaded components in power transmission and linear motion systems.

Introduction Cylindrical Taper Ring Gages for a multitude of tapers are available at WESTport. They are available in Jarno tapers, Morse tapers, National Machine tapers, and Brown and Sharp tapers. Our equipment is specifically modified for measuring and grinding a taper. The tapers are designed with or without tangs. The diameter tolerances are minus for rings and plus for plug gages. They are the most economical way of checking tapered outside and inside diameters. Cylindrical Taper Ring Gages at WESTport The Cylindrical Taper Ring Gages are manufactured to the high end of the ANSI specifications to provide maximum accuracy and wearability. The ANSI standard on Machine Tapers can be a bit confusing to users. If you end up ordering a taper ring and a taper plug gage, they will not match each other, therefore, all machine tapers are specifically mentioned.  The correct procedure for ordering is to order a plug to the standard and a "check ring" to check the plug for wear, and vice versa the ring to the plug.  These gages are a fast, accurate and economical way to check parts. WESTport’s licensed metrology laboratory also provides ISO 17025 calibration services for all of your plug and ring gages and any other measuring or test instruments that require certification. Contact us at 1-888-400-4243 (USA and Canada) or 1-631-321-0160 (International) with any questions or for a free quote. Cylindrical Taper Ring Gages Specifications You can use these Cylindrical Taper Ring Gages for Jarno tapers, Morse tapers, National Machine tapers, and Brown and Sharp tapers All parts can be inspected quickly and efficiently reducing costs Precision hand lapped to provide maximum accuracy and wearability Available in steel and chrome Free NIST certificate of accuracy Conclusion Since 1989, the WESTport team has been providing Cylindrical Taper Ring Gages all around the world. We are devoted to consistently improving our goods, processes, and services to preserve as an industry leader by putting our customers’ interests first. We are also an ISO 9001, ISO 6508, ISO 6506, and ISO/IEC 17025 recognized manufacturer that provides “Quality you can Trust” to over 135 countries.

Introduction An ANPT L-1 Ring Gage is a special gage that is used on the external rings of devices or components. This includes plugs, pipes, or other forms of fittings that have ring threads. But contrary to other gages, the ANPT L1 ring gage is applicable on ANPT threads which are also called the Aeronautical National Pipe Taper threads. ANPT threads are different in comparison to NPT threads as they do not require any form of sealants. Whereas NPT threads require sealants since they are not designed to be used in aeronautical applications. ANPT threads are suitable for aeronautical applications where there is a need for a sealant thread joint that is not possible with either O-rings, gaskets, or straight threads. How To Use It? All the external threads are first gaged with the L1 thread ring gage which travels L1 distance over the threads and engages the threads that will be engaged when the component is hand-tied. To check the threads beyond the L1 length, an L2 ring gage is used. In essence, ANPT thread ring gages are available in three measurements: The ANPT L1 ring gage also called the thin ring is used for checking the thread elements over the length of engagement that is hand tightened The ANPT L2 ring gage also called the thick ring, measures the thread elements when the component is tightened with a wrench The final is the ANPT 6-step plain ring which is used for checking the major and minor diameter of the male. Moreover, ANPT thread ring gages are measured on the SAE AS71051 standard. More On ANPT L-1 Ring Gage The process for measurement is rather simple. Simply place the ring onto the thread and rotate the gage. It should travel smoothly all the way up to the L1 distance, which are the thread elements that are engaged when the component is Hand tightened. The ANPT L1 screw threads have a larger major diameter in comparison to NPT gages. Similarly, the minor diameter is also larger, and the rings are designed such that they form a mechanical seal that eliminates the need for using any kind of sealant, making them ideal for aeronautical applications.  ANPT threads are measured in the same fashion as NPTF threads, both internally and externally (we use the ANPT L-1 ring for external measurement). But the gages are still dimensionally different which is why they cannot be used interchangeably. From the basic number of turns specified for the ANPT L-1 ring, a turn of 1 ½ from the basic turn is still acceptable for the L2 ring gage. Conclusion At WESTport Corporation, we have been serving the industry since 1989 by providing quality assurance products and services. Our premium quality products are not only designed to be inexpensive, but unparalleled in class and quality. WESTport employs state-of-the-art measures to ensure all our products comply with the ISO 6506, ISO 6508, ISO 9001, and ISO/IEC 17025 standards. Moreover, our expanded product line includes (but is not limited to): Precision Thread and Plain Gages Medical Gages Spline Gages Custom Gages (made to your blueprint specifications) API Plug and Ring Gages Taps and Dies Hardness Testing Products Full-service Metrology Laboratories for Tool calibration, Repair, and Onsite Services Written by WESTport Corporation. All rights reserved. Any reproduction is strictly prohibited.

Introduction ANPT L2 ring gage is the second ring gage that is used for the measurement of the external rings on components like fittings, pipes, plugs, etc. Before this, ANPT L1 ring gage is used which is for the purpose of determining the thread elements that are engaged when the component is Hand tightened. In contrast to that, the ANPT L2 ring gage is used to engage the thread elements that will be engaged when the component is wrench tightened How To Use It? ANPT L2 ring gages are used in conjunction with L1 rings as well as with the 6-step ring. However, L1 and 6 step rings are more commonly used in conjunction in contrast to ANPT L2 ring gage. The L2 gage measures the effective external threads that are situated beyond the L1 distance. The application of both, L1 and L2 gages are similar to a major degree with a difference in the count of the number of turns that the product travels or fails to travel, in case the piping of the component is determined to be faulty. More On ANPT L-2 Ring Gage ANPT or the Aeronautical National Piper Thread rings are different from the NPT or the NPTF thread rings, given that they are for aeronautical applications. The do not require the use of any sealants as the threads form an airtight mechanical seal that prevents any sort of leakage. This is why they are called “dry seal” threads. Although the ANPT threads are similar to NPT threads, the difference in the application for aeronautical purposes dictates that they must be controlled very carefully for taper, thread form, and diameter. This is because up until the length of 2-inch size, the ANPT and NPT threads are almost identical and have a requirement of an L1 gage. The ANPT L2 ring gage is for measuring the second half of the threads that are engaged when the component is wrench tightened After both, the L1 and L2 lengths have been checked, the ANPT 6-step ring is used which helps to measure the major and minor diameter of the threads of the part in use. ANPT threads are measured in the same fashion as NPTF threads, both internally and externally (we use the ANPT L-1 ring for external measurement). But the gages are still dimensionally different which is why they cannot be used interchangeably. From the basic number of turns specified for the ANPT L-2 ring, a turn of 1 ½ from the basic turn is still acceptable for the L2 ring gage.  Conclusion WESTport Taper pipe ANPT L2 Ring Gage is available in a variety of styles and over a wide range of measurements. WESTport stands proud as an ISO 17025  manufacturer of quality assurance products with a commitment to client satisfaction and the provision of reliable products as an industry leader. Production units with regular and excessive use of Taper Pipe NPTF L3 Plug Gage are advised to have several spares at hand along with a master thread plug to regularly check on the wear and tear of their ANPT L2 Plug Gage. Written by WESTport Corporation. All rights reserved. Any reproduction is strictly prohibited.

Introduction:NPTF L1 ring gages inspect the hand-tight engagement or the functional size of a part in question. This includes the male threads or the nipple that must conform to specific calculations before being deemed usable. NPTF L-1 RIngs are designed to conform to the ANSI/ASME B1.20.5 standards. Gaging the NPTF external threads requires using more equipment so it confirms the standards stated. Screw thread pipe ring gages have two basic classes which includes plain and threaded. NPTF Rings L-1 belongs to the latter. The gage is threaded onto the pipe or equipment to be measured via hand. More About NPTF Rings L-1:NPTF is also called “Dryseal” because the thread tolerance is controlled very strictly. Still, the gages are used in a similar manner to plug gages except for the difference in the thread, which is internal in the case of pipe plugs and external in the case of rings. NPTF Rings L-1 is also called “thin” gage and parts that are measured on it are considered tolerable when they come flush to the ring’s end to a positive or negative one turn of the unmarked side, effective measuring the first 4 or 5 threads. For the further threads, NPTF L-2 ring gage is used which measures from the fifth to seventh threads. About NPTF Threads:NPTF threads are measured in the same fashion as ANTP threads both internally and externally (we use the NPTF L-1 ring for external measurement). But the gages are still dimensionally different which is why they cannot be used interchangeably. From the basic number of turns specified for the NPTF L-1 Ring, a turn of 1 ½ from the basic turn is still acceptable for the L2 ring gage. Both NPT and NPTF have the same taper per inch, as well as threads per inch, the real difference lies in diameters (major and minor) along with the crest and the root of the threads. The threads of both, NPT and NPTF are designed differently, with the NPTF threads being designed to have a smaller range than NPT threads and interfere with the mating thread. This in turn creates a dry mechanical seal that prevents leakage without the use of a sealant. This happens because the NPTF threads are designed to have interference at the root and crest of the threads not just minor, but also on the major diameter. This results in a leak-proof connection.Conclusion:NPTF L-1 Ring Gages from WESTport Corporation are ideal for measuring the external threads of pipes and/or other equipment and ensuring the said equipment or part in question falls within the said parameters. Using state-of-the-art technology and excellent customer service, we are thoroughly committed to ensuring we retain our status as one of the major quality assurance products and services. WESTport has been servicing industry worldwide since 1989 and is an ISO 9001 and ISO 17025 accredited manufacturer of quality assurance products. Written by WESTport Corporation. All rights reserved. Any reproduction is strictly prohibited.

Introduction:NPTF L-2 Ring Rages are used in conjunction with NPTF L-1 Rings, where it is used to inspect the wrench engagement threads of a coupling and the taper of the external threads. They are manufactured as per the ANSI/ASME B1.20.5 standard. WESTport provides a free certfificate traceable to NIST with each ring gage. L2 rings are also called the thick ring and that is used to check the thread element of those threads that have been engaged when tightened with a wrench. They are used in conjunction with the NPFT L1 gages and ensure dimensional compliance of the rings of the equipment or part in question. How They Are Used:The NPTF L-2 Rings are used as a check on taper where its engagement in the L-1 and L-2 dryseal must be within “One and a half” turn of the difference between the basic turn engagement of the ring gages. Basically, you are using the NPTF external ring gages in a similar fashion to pipe plug gages. The only difference is the measurement of the external gage instead of the internal. NPTF L-2 Rings are not just for the second half, but also the required half for the measurement of the fifth, sixth, and seventh threads. The L2 in the name is a representation of the dimension in the thread specification that coincides with the “Wrench Tight Engagement Length”.After the use of NPTF L-2 Ring Gage, a final check involves the use of a plain tapered ring gage, which is also called the NPTF 6 Step which helps in the measurement of the major diameter of the external thread of the part in question. More on NPTF 6 Step Rings:NPTF, along with ANPT (Aeronautical National Pipe Taper) external threads are first graded with NPTF L-1 Ring Gage for the measurement of the first five rings. The gage is hand tightened and the parts being checked are considered acceptable when they come flush to the end of the ring to plus or minus one turn of the unmarked side. The L-1 ring is also called the thin ring which is followed by the thick or the L-2 ring for checking the approximation of the rings or threads from fifth to seventh. With special emphasis on thread tolerance, the 6-step ring is used in the end.Similar to the L1 ring, the L2 ring is also used as per the count of the number of turns that determine the distance traveled by the ring over the object in question. L-1 and NPTF L-2 Rings together inspect the lead, taper, pitch and minor diameter. The face of the rings should not vary more than ½ turn to the relative position of the small end of the pipe and the basic gaging with the use of both L-1 and NPTF L-2. Conclusion:At WESTport Corporation, we have been providing industry world-wide with precision measuring instruments and calibration services since 1989. WESTport employs state-of-the-art measures to ensure all our products comply with the ISO 9001, and ISO/IEC 17025 standards. Moreover, our expanded product line includes (but is not limited to): Thread and Plain Gages API Plug and Ring Gages Taps and Dies Medical Gages Spline Gages Full-service Metrology Laboratories for tool calibration, repair, and onsite services Written by WESTport Corporation. All rights reserved. Any reproduction is strictly prohibited.

Threaded fasteners play a vital role in the construction of a wide range of products. Without accurate thread sizing, a fastener's ability to provide a secure connection is compromised. Manufacturers rely on thread gages to check fastener specifications and ensure the integrity of all threaded fasteners leaving their facility. Your thread gages are designed to be durable, but they may sustain some damage over time. If you know how thread gages can sustain damage, you will be equipped to identify faulty thread gages before they create serious problems in the future. 1. Abrasions One of the most common ways that a thread gage can sustain damage is through contact with the fasteners it is measuring. A fastener is either threaded through or into the thread gage. The threading process can create friction that causes abrasions to form on the interior surface of the thread gage. Abrasions have the potential to alter the profile of the thread gage, making it impossible to produce an accurate reading when using the damaged thread gage to take measurements. Be sure that you inspect your thread gages often for evidence of abrasions and replace damaged gages quickly to preserve the integrity of your fasteners. 2. Expansion Many of the thread gages used in modern manufacturing facilities are made from steel. Steel is a metal alloy that offers great strength and durability, but it does have a tendency to expand over time. The molecules within a steel product can start to relax once the steel is put into use. Environmental factors like temperature and humidity can influence the rate at which steel expands. You want to ensure that you are using your thread gages in a controlled environment. Fasteners should only be tested in temperature-controlled settings, and thread gages must be stored in a temperature-controlled space to prevent any damage caused by expansion. 3. Burrs The dimensions of a thread gage must be exact if you want to ensure that your fasteners meet strict design specifications. Anytime one metal product comes into contact with another, it's possible for burrs to form. Burrs are the result of contaminants that have cut their way into the surface of your thread gages. A burr can make it impossible to obtain an accurate measurement using your thread gage, and this could result in a decline in fastener quality. Inspect all thread gages used in your facility often to ensure burrs don't cause threaded fastener problems in the future. To learn more about thread gages or to replace your worn-out ones, contact a supplier.