Technical Information
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Calibration Procedures for Thread Ring Gages Thread Check's Calibration procedure sheet provides step by step detailed instruction for properly setting and calibrating thread ring gages by use of AGD standard truncated setting plug gages. The setting of thread ring gages is specific to the particular set plug that the ring is set to. It is common for ring gages to have a different feel on another setting plug of the identical size. It is recommended that a set plug be readily available in house to inspect gages being heavily used or for gages that have been dropped or impacted. For high volume inspection, it is good practice to have a new backup gage for comparison and reference inspection against the heavily used gage. Go thread ring gages can be set slightly snugger than No Go thread ring gages particularly when shipping components to customers for incoming inspection and assembly. Keep gages lubricated and handle with care for longer gage life. Spinning ring gages onto parts or forcing gages past burrs will reduce gage life. |
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Adjustable Thread Ring Gage Calibration: How Accurate Is It? While a new AGD - American Gage Design adjustable thread ring gage is initially calibrated to a master setting plug gage, the setting can be slightly altered during the transport from manufacturer to end user. This can result from a variety of factors, ranging from a dropped adjustable ring gage to exposure to radical changes in temperature during the shipping process. |
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ANSI AND INTERNATIONAL THREAD SERIES DESIGNATIONS Thread Check, Inc. manufactures gages to the following ANSI Thread Series Designations and international standards. All Unified threads including – UN, UNC, UNF, UNEF, UNS, UNJ, UNJC, UNJF, UNJEF, UNR, UNRC, UNRF, and UNREF. NC5, NC5HF, NC5CSF, NC5ONF, NC5IF, M, MJ, MJS, UNM, NPT, NPTF, F-PTF, PTF-SAE Short, PTF-SPL Short,, PTF-SPL Extra Short, SPL-PTF, ANPT, NPSL, NPSM, NPSC, NPSF, NPSI, NH, NPSH, NFPA, NHR, NGT, NGO, NGS, SGT, R, Rc, Rp, G Series, BSW, BA, ACME –C, ACME –G, Stub ACME, BUTT, PUSH BUTT, AMO, AWWA, DIN, JIS, and ISO standards |
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Basic Screw Thread Designations External and internal thread diagrams illustrate basic thread geometry. This technical sheet illustrates proper thread nomenclature and terminology for screw threads. |
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Fixed Limit Gage Fact Sheet This document provides a gagemaker tolerance chart for selecting gage tolerances as well as tolerance direction for various gages. The fixed limit gage fact sheet also explains how to properly determine gage tolerance for measurement applications. The fix |
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Gage Tolerance Thread Check’s gage tolerances and gage maker chart are listed in one convenient document for easy reference. This document provides tolerances for class X and class W tolerances of pitch diameter, major diameter, minor diameter, and lead for thread gages |
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Standard Inch Pitch Diameters Thread Check, Inc. offers basic, 2B, 3B, 2A, & 3A pitch diameter dimensions in chart form. Pitch diameters are the most important characteristic because it reflects the widest spectrum of possible defects in a thread. Pitch diameters can be accurately mea |
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Metric Pitch Diameters Thread Check, Inc. offers 6H and 6g metric pitch diameters for thread gages. Pitch diameters are the most important characteristic because it reflects the widest spectrum of possible defects in a thread. Pitch diameters can be accurately measured by use of the 3-wire method |
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Proper Care And Usage Of Gages Part dimensions to be gaged should be cleaned and burr free to prevent gaging interference. Grit and part chips which become lodged in thread gages will create scratches and wear on the flanks of threads and on the outside and inside diameters of cylindrical plain gages. Various materials such as aluminum and castings are extremely abrasive and will tend to wear out gages more quickly than other types of materials. Finer pitch and smaller diameter thread gages tend to wear quicker than larger and coarser pitch gages and have less gage tolerance as well. Regarding thread gages, it only takes a small amount of wear to have a significant effect on the pitch diameter. The wear on each flank angle is multiplied by almost 4 times to determine the total impact of wear on the pitch diameter. 50 microinches or 1 micron of wear per thread flank will impact the measured size by .0002” which can be the total tolerance of many thread gages. |
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Terms Relating to Screw Threads and Gages Thread Plug Gage is a complete internal thread gage of either single or double-end type, comprising handle and threaded gaging member or members, with suitable locking means. |
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No Go Gaging Per ANSI/ASME B1.2-1983 An American National Standard A NoGo or Lo thread ring gage inspects the NoGo or Lo functional diameter limit of product external thread. The NoGo thread ring gage, when properly set to its respective calibrated thread setting-plug, represents the NoGo (Lo) functional diameter limit of the product external thread. NoGo (Lo) thread ring gages must be set to the applicable truncated or Hi-Lo setting plugs. |
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Rules For Determing How Many Turns A No Go ( Lo ) Ring Gage Can Enter A Part A NoGo or (Lo) thread ring gage inspects the NoGo or (Lo) functional diameter limit of product external thread. The NoGo thread ring gage, when properly set to its respective calibrated thread setting-plug, represents the NoGo (Lo) functional diameter limit of the product external thread. NoGo (Lo) thread ring gages must be set to the applicable truncated or Hi-Lo setting plugs. |
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What is the difference between UNR vs. UN Screw Threads? The UNR thread form and UN thread form are identical except that the roots of the external threads are rounded with a radius of curvature between 0.108 and 0.144 times the pitch. The rounded root improves fatigue strength compared to the UN thread form. |
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Thread Systems The two major screw thread systems used today are ISO metric and the Unified thread standard. The advantages of using coarse threads and fine threads are covered in this document. A metric tolerance class 6g ring and 6H plug is suitable for use where a Unified class 2A Ring and 2B thread plug was previously used on a thread for comparison basis. |
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Checking the Pitch Diameter of a Thread with a “No Go” Gage The pitch diameter of a thread is the most important characteristic because it reflects the widest spectrum of possible defects in a threaded part or gage. |
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Reference Standards A common issue of measurement problems is the use of standards and specifications that may be outdated. User of these standards should contact the reference sources to ensure they are working to the most current standard. The following list covers many popular gaging and measurement standards. |
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Unified Miniature Screw Threads per ASME B1.10M 2004 Dimensional product data and tables for Unified Miniature Screw Threads per ASME B1.10M 2004. |
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The Three Wire Method Of Measuring Pitch Diameter The accurate measurement of pitch diameter of a thread, which may be perfect as to form and lead, presents certain difficulties which result in some uncertainty as to its true value. The adoption of a standard uniform practice in making such measurements is, therefore, desirable in order to reduce such uncertainty of measurement to a minimum. The so-called “three – wire method” of measuring pitch diameter, as herein outlined, has been found to be the most generally satisfactory method when properly carried out, and is recommended for universal use in the direct measurement of thread plug and thread setting plug gages. |
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Thread Measuring Wires - The Foundation of Proper Thread Calibration When you are calibrating thread plugs, thread setting plugs and AGD style thread ring gages it is important to know the correct size and proper constant of the thread measuring wires, as they provide the foundation for accurate thread gage calibration. Working thread plugs and thread master setting plug gages are calibrated by means of the three-wire method. The degree of accuracy in the results of your readings depends on the accuracy of the thread measuring wires. An error of one unit in the mean diameter of thread measuring wires will have a multiplying effect of three units in the pitch diameter of 60° thread plug gages. |
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The Tri-Roll Comparator System The tri-roll comparator system provides a fast and efficient means of definitive thread inspection. Also, variable data output makes this gage a perfect statistical process control device. Routinely, the tri-roll thread comparator is used to analyze and distinguish the following characteristics: Functional diameter size, Pitch diameter size, Lead and/or flank angle deviation, Taper, and 120-degree out-of-round (lobing). |
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White Paper on Resolving Measurment Disputes Disputes over measurements can be costly for both parties to resolve and may hinder ongoing relations between suppliers and users of gages and instruments. Often it is simpler for both parties to agree to accept an average value of their readings as the final ‘size’ or the point at which their readings plus measurement uncertainties overlap. |
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Selecting Gaging Rolls Thread Check Inc. offers various types of interchangeable gaging rolls to check maximum and minimum limits of size, pitch diameter, and single element gaging. |
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Taper Pipe Thread Gages Thread Check, Inc. offers a complete line of tapered pipe gages including special and custom designs. NPT general purpose pipe thread plug and ring gages are manufactured per ANSI/ASME B1.20.1. Threads are within the permissible limits of the tolerance wh |
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Taper Pipe Thread Gages Part 2 The L2 ring is used to gage the effective external threads beyond the L1 location length. It is relieved by counterboring at the small end to a depth equal to L1 minus 1P. The L2 is used like the thin L1 gage is used with a count of the number of turns by which the product over travels or fails to reach basic. |
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Gages Required To Check Other Pipe Threads Thread Check Inc. offers a complete range of standard and custom pipe thread gages. Review the chart for gages required to check other pipe threads. |
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NPTF Class 2 Specifications NPTF gages are manufactured per ANSI/ASME B1.20.5. Standard practice for gaging NPTF threads calls for using 2 or 3 gages in coordination with each other. The standard calls out class 1 and class 2 NPTF threads. Class 1 signifies that specific inspection |
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NPT and NPTF NPT and NPTF gage document provides a complete overview of general purpose and dryseal pipe threads. This document describes the differences between class 1 and class 2 NPTF threads. L1, L2, L3, and 6 step gages are described in detail. |
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API (American Petroleum Institute) Gages Thread Check, Inc. offers API thread gages to Spec. Q1, Spec. 5B, Spec. 7, Spec. 11B as well as many special API gages. Our engineers have served on various API gaging subcommittees. API gages come in all types include casing-round, line pipe, tubing-non |
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Profile Gages Thread Profile, TP Series The TP Series of Thread Profile Gages are manufactured to tolerances of ±.0002" using EDM technology. These precision gages are ideal for quickly identifying each of the different thread forms named in the API Std. 5B and Specification 7. Profile gages ca |
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British Gages Thread Check, Inc. provides a complete range of British thread gages, as well as plug & ring gages manufactured to the latest BS and ISO specifications. Thread Check, Inc. supplies full form ISO 228 - 2 ( BS2779 ) Go/No Go thread plug and ring gages for p |
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3 Wire Thread Measuring Systems The traditional three-wire method is the most accurate method of measuring the effective or pitch diameter of an external screw thread. Unfortunately in the past, holding and correctly positioning three wires against a thread while simultaneously taking an accurate measurement had been an extremely difficult task. Now, Thread Check's 3-Wire Thread Measuring System provides a simple and precise way for determining the pitch diameter for threaded parts and thread plug gages. The system enhances Repeatability and Reproducibility ( R & R ) and reduces measurement time to a fraction of the time normally taken using the traditional three-wire method. |
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Selecting Gage Blocks Select gage blocks in accordance with the combination range required. If a large length is required, add a long block set. Select gage blocks in accordance with the minimum length step required. Add wear block sets if necessary. |
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Mitutoyo Series 516 Gage Blocks Precision gage blocks are the primary standards vital to dimensional quality control in the manufacture of parts. Mitutoyo offers gage blocks in a choice of rectangular or square, metric or inch and steel or CERA (ceramic) types. |
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Mitutoyo ABSOLUTE Digimatic Micrometers Series 227 The Mitutoyo ABSOLUTE Digimatic micrometer series 227 with an adjustable measuring force offers a constant and low measuring force mechanism with a non rotating spindle. |
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Mitutoyo Blade Micrometers Series 422, 122 The Mitutoyo blade micrometer series 422 and 122 non-rotating spindles are used for measuring the groove diameter of shafts, Keyways, and other hard to reach portions. The blade micrometer features a ratchet stop for constant force |
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Mitutoyo Coolant Proof Micrometers Series 293 Mitutoyo Coolant Proof Micrometers Series 293 with dust and water protection conforming to IP65 level enables use in environments exposed to cutting oil and other fluids. Measurement data output function is available with a water resistant connection cable. |
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Mitutoyo Disk Micrometer Series 369, 227, and 169 Mitutoyo Disk Micrometer Series 369, 227, and 169 are designed to easily measure root tangent length of spur gears and helical gears. The disk micrometers feature a non-rotating spindle to eliminate torque on the work piece. |
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Mitutoyo Caliper Type Micrometers Series 343, 143 Mitutoyo Caliper type micrometers function like calipers with greater precision. The ratchet stop provides constant force. |
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Mitutoyo Crimp Height Micrometers Series 342, 142, 112 Mitutoyo Crimp Height micrometers are specifically designed to measure the height of crimp contacts. |
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Mitutoyo Gear Tooth Micrometers Series 324, 124 Mitutoyo Gear Tooth Micrometers Series 124, 324 measure over pin diameter of gears with precision steel and carbide ball tipped measuring faces. Interchangeable ball anvil – spindle tips for various gear modules are optional. |
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Mitutoyo Screw Thread Micrometers Series 326, 126 Mitutoyo Screw Thread Micrometers Series 126 and 326 are offered with anvil-spindle tip sets for 60 degree and 55 degree screw threads. The optional V-Anvil and conical spindle are made of high grade special steel, hardened and precision ground. |
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Mitutoyo Series 158 Optical Flats Mitutoyo Series 158 Optical Flats are used for inspecting the flatness of micrometer’s or gage block’s measuring faces with high accuracy. |
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Mitutoyo Paper Thickness Micrometers Mitutoyo Series 169 Non Rotating Spindle type is specifically designed for paper thickness measurements. |
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Mitutoyo Optical Parallel Series 157 Parallelism Check between Measuring Faces by Means of Interference Fringe Produced by an Optical Parallel. The parallelism between the measuring faces can be determined as follows; place the optical parallel to the anvil and observe the number of interference fringes produced on the spindle side under the measuring force of the micrometers. The parallelism is about 1µm (0.32µm x 3 = 0.96µm). Fringe on the anvil side must not be more than one. |
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Mitutoyo Telescoping Gage Set Series 155 Mitutoyo telescoping gages Series 155 feature spring-loaded plungers that expand within the bore (or groove), allowing determination of the internal diameter or groove width). With a knurled clamp. Supplied in a fitted pouch. |
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Mitutoyo Uni-Mike Interchangeable Anvil Type Micrometers Series 117, 317 Mitutoyo - Uni-Mike Interchangeable Anvil Type Micrometers measure tubing thickness, shoulderedge distance, rivet head height, etc. with interchangeable anvils (flat anvil, rod anvil, V-anvil). |
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Mitutoyo Tube Micrometers Series 115, 295 Mitutoyo Series 115, 295 tube micrometers are designed to measure the wall thickness of various tubing. The tube micrometers have two combinations of measuring faces (carbide tipped): spherical-flat type, and spherical type |
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Mitutoyo Standards for V-Anvil Micrometers Series 167 Mitutoyo V-Anvil micrometer standards are specially designed for the zero point setting of screw thread micrometers. Supplied in fitted carton. |
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Mitutoyo Standards for Screw Thread Micrometers Series 167 Mitutoyo Screw thread micrometer standards are specially designed for the zero point setting of screw thread micrometers. Supplied in fitted carton. |
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Mitutoyo Outside Micrometers w/ Friction Thimble Series 103 Mitutoyo outside micrometers series 103 feature Hammertone, baked-enamel-finished Frame with ratchet stop or friction thimble for exact repetitive readings. |
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Mitutoyo Ratchet Thimble Micrometer Series 101, 102 Mitutoyo – ratchet thimble micrometers feature a ratchet function that works both from the thimble and the speeder, allowing easy one-handed operation. The micrometer features a clearly audible ratchet operation for reassurance that measurement is being performed at constant, preset force. The micrometer is provided with a Certificate of Inspection and a standard bar except for 0 - 25mm and 0 - 1” models. |
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Mitutoyo Outside Micrometers Series 104 Mitutoyo outside micrometers – Series 104 features a wide measuring range with interchangeable anvils and ratchet stop for constant force. |
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Mitutoyo Outside Micrometers Series 107 Mitutoyo outside micrometers Series 107 uses a dial indicator for direct GO/NG-GO judgment for mass-produced parts with anvil retracting trigger for quick measurement |
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Mitutoyo Spindle Attachment Tips Spindle attachment tips are available to measure odd work pieces.Several convenient anvil attachments are prepared by MITUTOYO. Among them the most often used one is the ball attachment. The ball attachments are hardened steel balls with .200” and .250” diameters which are placed on the .250” and .315” diameter anvils, respectively, by rubber caps. With these attachments, regular micrometers can measure cylindrical wall thickness, but, .200” or .250” must be subtracted from the readings. Other attachments shown here are .500” in length. The added amount must be subtracted from the reading. |
