In Gage Threadcheck's Official Blog


Cylindrical Plain Ring Gages

Cylindrical plain ring gages are used to check outside diameters of parts as well as for mastering measuring instruments. Plain ring gages are used to set electronic bore gages, air gages, internal micrometers and length measuring instruments. Plain ring gages are ideal for gauging the outside diameter of parts. The go ring gage is used to verify the high limit of the part and the no go plain ring gage is used to verify the low limit of the part. Cylindrical plain ring gages are offered in various materials including tool steel, chrome steel, carbide, and ceramic.

Gagemaker tolerances for cylindrical gaging products range from extremely tight class XXX to more economical class ZZ. Roundness and taper does not exceed 50% of the gagemakers tolerance. Thread Check can supply gauges from .015” up to 28.00” in diameter. The No Go ring gage is distinguished from the Go ring by an annular groove cut into the outside surface. Both ring gauges are also marked with size, type and gagemaker tolerance. The outside diameter of a plain cylindrical ring gage is knurled for easy handling and gripping. All plain cylindrical ring gauges are manufactured to ASME/ANSI B47.1 and ASME/ANSI B89.1.6. Plain ring gages up to 1.510”are manufactured without a flanged outer diameter. For ring gauges larger than 1.510”, the gages have a flanged diameter. The gage has less material on the outside of the diameter thus making it easier to handle and use by the inspector. Cylindrical plain gages manufactured in carbide use a solid carbide ring gauge jacketed with a steel outside sleeve. The jacketed steel sleeve reduces the weight and protects the carbide insert which is hard and brittle.

Thread Check’s expert sales engineers can assist you in selecting cylindrical ring gauges for your applications.


Go/NoGo Ring Gage Set

Carbide Ring Gages

Carbide Ring Gages

Flanged Diameter Design

Flanged Diameter Design

Thread Check Inc.
900 marconi Avenue
Ronkonkoma, New York 11779




Alternate Size Thread Measuring Wires

It is possible to use standard 60 degree thread measuring wires to calibrate 55 degree British thread plug gages and external product. Thread Check often receives inquiries for special thread measuring wires to calibrate Whitworth/British 55 degree threads. Although Thread Check Inc. can certainly supply these special thread measuring wires, the cost is higher and the lead time to manufacture is typically 4 weeks or more. The best solution is to select a standard 60 degree thread measuring wire which is close to the 55 degree thread measuring wire diameter and simply adjust the constant value. This alternative set of thread measuring wires with an adjusted constant for the 55 degree thread angle will achieve the same exact results. The same method can be applied to 29 degree Acme and 45/7 degree buttress threads.

All “Best Size” thread measuring wires have a maximum and minimum wire diameter that may be used to measure pitch diameter. Maximum and minimum thread measuring wires should be used which are safely within the limiting dimensions given by the formulas below.


Include Thread Angle Max. Best Min.
60° 1.010362p .57735p .505182p
55° .82573p .563692p .50568p
29° Acme .650013p .51645p .487263p

P=pitch  n=TPI   P=1/n

The wide range of standard wire diameters in stock found within the 60 degree inch and metric sizes and the 29 degree acme sizes makes it possible to find a wire diameter very close to a required British or special size. The measurement of pitch diameter is least effected by an error in the included angle of the thread by a wire diameter which is closest to the calculated best size wire.

Related topics regarding thread measuring wires:

Thread Check’s expert sales engineers can assist our customers with selecting the correct wire size and calculating the new constant value to ensure accurate measurements.

Thread Check Inc
900 Marconi Ave
Ronkonkoma, New York 11779
Tel: 800 767 7633



ISO 9001: 2008 Audit Completed

We are pleased to announce that once again Thread Check Inc. passed its 2015 ISO 9001:2008 Audit with another perfect score.

ABS Quality Evaluations conducted a 1 day audit of Thread Check Inc. There were no major or minor non conformities found during the audit. This is the 6th year in row with zero nonconformities. This is a testament to our organization's continued commitment to customer satisfaction, employee empowerment and continuous improvement.

We would like to thank and congratulate all of our employees for their commitment to the quality management system.



Progressive Cylindrical Plug Gages

Progressive cylindrical plug gages may be your best choice for checking the internal diameter of parts quickly. This gage design is ideal for high frequency and high volume inspection. Both Go and No Go diameters are combined on a single gage member, so parts can be inspected quickly in one easy operation. The progressive gage should smoothly enter the part and then stop at the high limit. Gage members are securely attached to either a taperlock handle or trilock handle with mounting bolts. Progressive cylindrical plug gages are available from .105" up to 8.0" in diameter. They can be supplied in steel, chrome or carbide materials. Plug gages tolerances range from class xx to zz. Specials and extra length gages are priced on request. Thread Check's expert sales engineers' can assist you with selecting the right gage for your application.

Progressive cylindrical plug gages


Thread Check Inc.


Adjustable Limit Snap Gages

Adjustable limit snap gages provide a quick and easy attribute method of checking outside diameters, groove diameters, or width dimensions by having the go and no go elements set into the snap gage. Thread Check offers 4 assorted frame styles of snap gages with sizes ranging up to 8 5/8. Larger frame sizes are quoted upon request. The anvil gaging contacts on the snap gages are adjustable and can be set to various sizes within a range. The anvil gaging surfaces are made of hardened ground and lapped tool steel. Marking discs are supplied on all snap gages. Thread Check’s standard snap gages are progressive in design. The work piece should enter the go limit and stop at the no go limit which is towards the back. Other designs are double ended and single purpose snap gages.

The snap gage works like a fixed caliper once it has been adjusted and set to a maximum and minimum size limit. To use a snap gage the upper anvil should be used as a reference point on the work piece. The gage should be pivoted with the upper anvil acting like a hinge and the lower anvil gaging the work piece. The plane of the snap gage should be perpendicular to the centerline of the work piece. The user must be careful not to tip or angle the snap gage which could create a false measurement. Care should be taken to use gentle force when gaging work pieces with snap gages. Snap gages can be used to gauge work pieces still loaded in a machine or hand held at an inspection area. Snap gages can also be mounted in stands so that an inspector can use both hands to manage the work piece.

Specifications for Thread Check Adjustable Limit Snap Gages

Adjustable Limit Snap Gages


Frame Description:

  • Model A Style 104:
    Covering: Metric Range: 0-229mm / Inch Range: 0-9
    Has 4 plain cylindrical pins in hardened tool steel. All 4 pins are adjustable for maximum working range.
    Maximum parallelism error over adjustment range 0.005mm (frame size 1-6) or 0.008mm (frame 1-13X).
  • Model C Style 108:
    Covering: Metric Range: 0-219mm / Inch Range: 0-8.5/8
    Has a rectangular plate anvil and two opposing square headed anvils  - all in hardened tool steel.
    These gauges have the largest gauging surfaces and hence longest life.
    Maximum parallelism error over adjustment range 0.005mm (frame size 1-6X) or 0.008mm (frame 7-13X).
  • Model MC Style 102:
    Covering: Inch Range 000 - .760"
    Has a one peice rectangular anvil and two adjustable square anvils - all in hardened tool steel.
    These gauges have the largest gauging surfaces and hence longest life.
    Maximum parallelism error over adjustment range 0.005mm (frame size 00 - 0 ).
  • Model U:
    Covering: Metric Range: 0-210mm / Inch Range: 0-8.1/4
    Has knife edge anvils and is based upon the C Type frame - steel only.
    These are typically used for measuring external grooves.
    Standard anvil width and depth 2.4 x 4.7mm.
    Miniature range anvils are 0.8 wide x 2mm deep.

For more information to purchase snap gages contact Thread Check Inc.

631 231 1515


Southern Style Thread Ring Gages

The Southern Adjustable Style thread Ring Gage features an adjustment mechanism that maintains the roundness integrity of the gage throughout its use. The helix path of the thread along the line of adjustment remains true and in alignment throughout the life of the gage. Aluminum gage bodies anodized green for Go and red for NoGo provide easy identification. Precision ground thread inserts are made of oil hardened tool steel. Thread class and tolerances conform to ASME/ANSI B1.2 or B1.16M. Sizes below .2500 and M6 are counterbored to hold specific length.

Southern Style Thread Ring Gages


Blunt Starts, Higbee Cuts, and Depth Notches

Thread Check can add many custom features to our thread gages such as depth notches, blunt starts, blunt points or chamfers that are
beneficial for several applications including thread depth gaging and short or shallow threads

Blind Hole – A hole that goes partially through a part.


Blunt Point –The removal of a male center point from threads smaller than #6 (M4).
This does not allow the gage to be face ground to within .5P.
This is not a Blunt Start. See Convolution below.


Chamfer – An angle ground on the front of a gage that allows for easier assembly with the mating part


Convolution – Removal of the incomplete thread back to the first full thread. Also
known as a “Blunt Start” or “Higbee Cut” per ASME B1.7 – 2006


Depth Notch – Measure from the centerline of the first full thread to the flat step of the notch.
A depth notch is only used on a go plug gage and is used to measure thread depth.


Grind Face w/in .5P - A convoluted thread plugs face is ground back to the base of
the first full thread. This permits the gage to inspect a blind hole to the bottom of the thread.

Contact Thread Check Inc for more information

800 767 7633 or 631 231 1515



New Digital Depth Thread Gages

Measure thread depth and gage thread size at the same time. Thread Check's digital thread depth gage uses ANSI standard taperlock thread plug gages for fast and accurate thread depth and size control. Thread Check's Thread Depth Control Instrument digitally measures thread depth with a resolution of .0005"/.01mm and accuracy of .002"/.05mm.

  • The gage is available in 4 handle sizes for diameters from .164" to .8125"
  • The No Go gage is conveniently located on the opposite end of handle
  • It's also Ideal for use with cylindrical plug gages for measuring the depth of plain bore holes
  • Available with optional wireless data interface to send dimensions into a PC
  • Custom gages, special length, special depth stops, dirt and air grooves are priced on request
  • LCD display with preset function
  • No Go gage conveniently located on opposite end of handle
  • Gage internal threads and accurately measure thread depth at the same time
  • Ideal for use with cylindrical plug gage for measuring bore depth
  • Thread Check's Thread Depth Control Instrument digitally measures thread depth with a resolution of .0005"/.01mm and accuracy of .002"/.05mm
  • Compatible with ANSI standard taperlock thread and plain gages in chrome and steel
  • Easy depth setting with optional master setting gage
  • Reading scale is always visible as gage rotates
  • Depth scale can be fixed for minimum thread depth

Visit our website or contact our sales department for more details


Digital Depth Thread Gage



Thread Check Inc. launches new site at

Thread Check Inc has launched its new web site

The new Thread Check website is a responsive web design.

Thread Check’s new website will enhance our customers experience with our products and service and make a powerful impression on our industry. Our goal for is to create an engaging site with detailed product and technical information.

Responsive web design (RWD) is an approach to web design aimed at crafting sites to provide an optimal viewing experience—easy reading and navigation with a minimum of resizing, panning, and scrolling—across a wide range of devices from desktop computer monitors to tablets and mobile phones.




Gear Measuring Wires

Thread Check's gear measuring wires are used to check the tooth thickness of gears at the pitch diameter. The gear wire method is more accurate than using tooth verniers to measure the tooth thickness. A measurement over the wires using a micrometer is compared with a perfect gear which is obtainable from the Van Keuren Handbook No 37. The Van Keuren Gear Measurement Tables are accurate to .0001" for 1 diametral pitch gears. A value based on the selection of pressure angle, number of teeth, and wire size is divided by the diametral pitch of the gear being measured. If the actual measurement is larger than the table value then the teeth are thick. If the value is smaller then the teeth are considered thin. A copy of the Van Keuren Handbook can be purchased on line at

Thread Check's gear measuring wires are supplied in sets of 2 identical wires. Thread Check's gear measuring wires meet or exceed Federal Specification GGG-W-366B for Grade AMGW. Wires are lapped  to RMS micro inch finish or less. Contact Thread Check Inc for modified gear wires, carbide gear wires, flatted gear wires.
Thread Check offers Gear measuring holders for both 2 and 3 wire gear applications. Please provide measuring instrument and spindle diameter when ordering.