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 Thread Plug Gages – Unified Series
Thread Check, Inc. offers a complete line of AGD – American Gage Design, unified working thread plug gages in both taperlock and reversible styles. Thread plug gages are manufactured per ANSI/ASME B1.2. Thread Check, Inc. plug gages are manufactured to an X tolerance in class 2B or 3B. Thread plug gages are available in UNC, UNF, UNEF, and specials. All standard thread plug gages are stocked in hard chrome coating which extends the wear life of the gage by more than a 100% thus providing dramatic savings in replacement costs. All Thread Check, Inc. gages are manufactured to the high end of the tolerance to ensure longer gage life. Thread Check, Inc. manufactures gages in carbide, ceramic and other types of specialty steels. Thread Check manufactures many types of special gages including pre-plates, multiple starts, special leads, acme threads, buttress threads, square threads, extra length thread gages, and custom gages to print. All thread plug gages are traceable to N.I.S.T.
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 Thread Ring Gages and Set Plugs – Unified Series
Thread Check, Inc. offers a complete line of AGD – American Gage Design, unified adjustable thread ring gages and truncated set plugs. Thread ring gages and set plugs are manufactured per ANSI/ASME B1.2. Thread ring gages and set plugs are manufactured to an X tolerance in 1A, 2A and 3A Go members and 2A and 3A No go members. Thread Set plugs are made to a class X tolerance on pitch diameter and class W tolerance on lead and angle. Thread plug gages are available in UNC, UNF, UNEF, and specials. Thread Check manufactures many types of special gages including pre-plates, multiple starts, special leads, acme threads, buttress threads, square threads, extra length thread gages, and custom gages to print. All thread ring gages and set plugs are traceable to N.I.S.T.
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 Thread Plug Gages – Metric Series
Thread Check, Inc. offers a complete line of AGD – American Gage Design, metric working thread plug gages in both taperlock and reversible styles. Thread plug gages are manufactured per ANSI/ASME B1.16M. Thread Check, Inc. plug gages are manufactured to an X tolerance in 6H class of fit. Thread plug gages are available in coarse, fine and special pitch sizes. All standard thread plug gages are stocked in hard chrome coating which extends the wear life of the gage by more than a 100% thus providing dramatic savings in replacement costs. All Thread Check, Inc. gages are manufactured to the high end of the tolerance to ensure longer gage life. Thread Check, Inc. manufactures gages in carbide, ceramic and other types of specialty steels. Thread Check manufactures many types of special gages including pre-plates, multiple starts, special leads, acme threads, buttress threads, square threads, extra length thread gages, and custom gages to print. All thread plug gages are traceable to N.I.S.T.
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 Thread Ring Gages and Set Plugs – Metric Series
Thread Check, Inc. offers a complete line of AGD – American Gage Design, adjustable metric thread ring gages and truncated set plugs. Thread ring gages and set plugs are manufactured per ANSI/ASME B1.16M. Thread ring gages and set plugs are manufactured to an X tolerance in a 6g class of fit. Thread Set plugs are made to a class X tolerance on pitch diameter and class W tolerance on lead and angle. Metric thread ring gages and set plugs are available in coarse, fine, and special pitch sizes. Thread Check manufactures many types of special gages including pre-plates, multiple starts, special leads, acme threads, buttress threads, square threads, extra length thread gages, and custom gages to print. All thread ring gages and set plugs are traceable to N.I.S.T.
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 Flexible Hole Location Gages
Flexible hole location plug gages also referred to as centerline hole location plugs are used to determine the true centerline to centerline distances of threaded holes. The flexible hole location gage is slotted at 90° increments to insure positive location on the thread flanks regardless of hole size. This feature provides a firm locating grip without pulling the shoulder of the plug up against the hole face thus avoiding any squareness error being transferred to the centerline measurement. The center is concentric to the threaded section within .0002” TIR for probe location of coordinate measuring machines as well as plate inspection setups as “overpin” measurements. The flexible hole location gage can also be used with vee blocks to check concentricity to other diameters. Thread Check stocks flexible hole location gages in unified and metric sizes. Gage sets are available.
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 S.T.I. Thread Plug Gages
Helical coil ( STI ) Plug Gages are used to gage threaded holes prior to insertion of screw thread inserts. Screw thread inserts are used to repair a damaged thread or to provide stronger thread assembly. All Helical Coil – STI thread plug gages are manufactured of oil hardened tool steel to a class X tolerance. Class W tolerance priced on request.
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 British Gages
Thread Check, Inc. provides a complete range of British 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 parallel British threads. Ring gages are available in Class A and B. BSPT Taper screw plug and ring gauges are manufactured per ISO 7/2 and BS 21 for testing pipe threads where pressure tight joints are made on the threads. BSF and BSW screw thread gages are used to test parallel threads having full form Whitworth profiles. BSF and BSW screw threads are manufactured per BS 84 and BS 919. BSW is a coarse thread series from 1/8 – 6.0” diameter. BSF is a fine thread series from 3/16 – 3.0” diameter. BA screw thread gages are used to test threads having a full form BA profile. They are manufactured to BS 93 and BS 919. BS 93 specifies basic information for the British Association thread form and tabulates diameters for threads from 0BA to 25BA.
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 Taper Pipe Thread Gages
Thread Check, Inc. offers a complete line of taper 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 when the gaging notch of the plug or gaging face of the ring is plus or minus one turn from being flush with the end of the thread. NPTF gages are used to inspect pipe threads that are used in dryseal applications. 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 taper pipe thread gages include PTF SAE Short and NGT sizes
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 Straight Pipe Thread Gages
NPSM straight pipe thread ring gages and set plugs are manufactured per ANSI/ASME B1.20.1. NPSM straight pipe thread plug gages are manufactured per ANSI/ASME B1.20.1. All straight pipe threads gages are supplied in a class 2A for rings and set plugs and 2B for working thread plug gages. NPSF straight pipe thread plug gages and ring gages are manufactured per ANSI/ASME B1.20.5. Other straight pipe thread gages include NPSC, NPSL, NPSH, and NH sizes.
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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 gage types include casing-round, line pipe, tubing-non upset, tubing-external upset, tubing-integral joint, extreme line casing, NC connections, regular, full hole, internal flush, H-90, slim hole, extra hole, wide open, AOH, PAC, XHole, Sucker rods B1 to B6, Sucker rods P1 to P6, Mining, BECO, D1-22, D1-42, American National special threads, tapered thread gages-AWWA, and many special custom gages.
API Stock list
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 Three Wire
Thread Measuring System
Thread Check, Inc. offers the three wire thread measuring system for fast and accurate thread measurement on a variety of thread measuring instruments. Thread Check's specially designed holders and wires make thread measurement fast and accurate. Thread Check's holders are fitted with certified full length thread measuring wires that meet or exceed the requirements of ANSI/ASMEI B1.2 and ANSI/ASME B1.16M as well as Federal Spec. GGG-W-366B. All wire holder sets include the actual wire size, NIST traceable number and constant required to determine the correct pitch diameter. Thread Check's Three Wire Thread Measuring System can be used in a wide range of applications including certifying thread plug gages and set plugs and monitoring and controlling pitch diameter during thread fabrication.
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 Certified Thread Measuring Wires
Thread Check, Inc. offers a complete range of certified thread measuring wires for unified, metric, acme, and specials. Complete library sets are available in inch, metric and acme sizes. All wires sets are supplied within .000020” of the best wire size. All wires are calibrated within .000050” of the size provided on the label. Commonality of the 3 wires is with .0000050” and roundness within .000010”. Thread measuring wires are supplied with a minimum hardness of Rc. 62.5. Thread measuring wires meet or exceed ANSI/ASME B1.2 and ANSI/ASME B1.16M.
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 Gear Measuring Wires
Thread Check, Inc. offers a complete range of certified gear measuring wires for unified, metric, acme, and specials Gear measuring wires are available for 2 and 3 wire gear applications. Gear measuring master sets are supplied from 2 pitch to 200 pitch. Wires are available for enlarged pinions, external gears, alternate series, and internal gears. All gear measuring wires meet or exceed former Federal specification GGG-W-366b for grade A.M.G.W. wires. Wires are lapped to a 2 micro inch finish or better..
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 Tri
Roll Thread Comparators
Thread Check, Inc. offers an extensive range of tri roll thread comparators. Tri roll thread comparators provide actual thread measurements of dimensional characteristics for quicker machine adjustments during thread production. The tri-roll reduces gaging time over thread ring gages. One single gage can be used to inspect pre-plate, after- plate, class 1, 1A, 2, 2A, 3, and 3A eliminating the need for multiple fixed limit thread ring gages. Rigid construction and constant measuring pressure provide consistent and accurate readings.
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 ITC – Internal Thread Comparator
Thread Check, Inc. offers the ITC – Internal Thread Comparators to provide actual thread measurement of dimensional characteristics for quicker machine adjustments and reduced gaging time over thread plug gages. One single gage can be used to check pre-plate, after-plate, class 2, 2B, 3, and 3B eliminating the need for multiple fixed limit thread plug gages. Rigid construction and constant measuring pressure provides consistent and accurate readings.
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 Master Setting Plugs and Rings For Tri Roll and ITC
Class “W” Full Form Master Setting Plugs and Master Ring gages are used to set Tri Roll Thread Comparators ITC – Internal Thread Comparators.
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 Power Driven Thread Gaging
Thread Check, Inc. offers an innovative Power Driven Gaging System that inspects threads for functional size and depth faster than conventional methods. Power driven thread gaging reduces operator fatigue and repetitive motion injuries. The gage safely check threads using unique slip clutches. The gauge is portable for heavy industrial use. The power driven thread gauge is now available with an optional digital depth control attachment. Custom threads and specially designed units are available.
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