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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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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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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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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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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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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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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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 o |
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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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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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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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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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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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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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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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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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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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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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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. |
