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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 fixed limit gage fact sheet offers tips on the proper care and usage of gages.
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 Reference Books
MACHINERY'S HANDBOOK, 27th Edition, Larger Print; GUIDE TO WORLD SCREW THREADS; INSPECTION AND GAGING, Sixth Edition; HANDBOOK OF DIMENSIONAL MEASUREMENT, Third Edition; etc. Thread Check, Inc. offers many technical books related to measurement, manufacturing and industrial processes as well all the technical standards available throughout the world. Source all of your Industrial Press publications from Thread Check, Inc.
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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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 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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 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 of root and crest truncation is not required, while class 2 signifies that such is required. Other tapered pipe thread gages include PTF SAE Short and NGT sizes. The NPTF Class 2 dimensional specifications are detailed in this document.
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 Gage Tolerances
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. This document also provides a gagemaker tolerance chart for selecting gage tolerances. See the Fixed Limit Gage Fact Sheet for tolerance direction for various gages. The Fact Sheet also explains how to properly determine gage tolerance for measurement applications.
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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 |
 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 measured by use of the three wire method.
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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 three wire method.
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 ANSI/ASME B1.2 bulletin
Purpose and Use:
The NoGo (Lo) thread ring gages inspect the NoGo (Lo) functional diameter limit, B, of product external thread. NoGo (Lo) thread ring gages, when properly set to its respective calibrated thread setting-plug, represent the NoGo (Lo) functional diameter limit of the product external thread. The NoGo (Lo) thread ring gages and NoGo (Lo)
threaded segment types indicating gage are more reliable for checking thin walled parts which might be deformed by a NoGo (Lo) thread snap. NoGo (Lo) thread ring gages must be set to the applicable W tolerance-setting plugs.
threaded segment type indicating gage are more reliable for checking thin walled parts which might be deformed by a NoGo (Lo) thread snap. NoGo (Lo) thread ring gages must be set to the applicable W tolerance-setting plugs. |
 White Paper on 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. |
 THREAD CHECK, INC. - CUSTOMER RETURN POLICY
Returns are NOT acceptable after 30 days from the time of purchase. Standard items may be returned within 15 days from date of invoice. A return authorization number must be issued from Thread Check Inc. prior to return and items must be returned within 6 days from RA number issued.A 15% restocking charge is assessed on returns of standard product. Special sizes and specially marked items MAY NOT be returned for credit. Upon inspection, credit will be given on standard items returned in resalable – “like new” condition with charges for freight out. |
 STRAIGHT PIPE GAGE APPLICATIONS
Thread Check, Inc. produces gages for checking products manufactured with straight pipe. Because of the variety of applications for straight pipe threads, it is necessary to give complete information pertaining to the product use to insure receiving the proper gages. Some of the more popular types of straight pipe threads are listed in this document. For detailed information on product and gaging specifications, the applicable standard should be reviewed.
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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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 THE THREE WIRE METHOD SYSTEM 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" or "three wire thread measuring system" 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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