Reference ASME B89.1.17-2001
Attributes to be inspected
- Diameter – Use high magnification comparator or measuring instrument with adjustable measuring force. .0000020” resolution or better is required. Use a cylindrical anvil.
- Roundness – Use Vee anvil with 60 degree included anvil. Cylindrical masters and a normalizing plate are required.
Suggestions for improved accuracy
Calibrate only in the central middle half of the thread measuring wire.
Thread measuring wires are calibrated on a functional basis so as to compensate for deformation when the wires are being used.
- Wire diameter is measured with the wire placed over a cylindrical anvil of a known size by a flat round contact point.
- The effects of errors in roundness are determined by noting the changes in diameter measurement utilizing a vee anvil and taking measurements around and along the wire.
Refer to ASME B89.1.17-2001 for measuring force and contact point configurations.
Wires must be unrestrained during measurement. They should be held in place by the specified measuring contact force only.
The set of 3 wires in a set must be calibrated at the same time to ensure the commonality of size standard is met. Each wire in a set must have the same diameter within .000010”.
Handle all thread measuring wires with care. Wires should be handled with soft tip tweezers
Allow adequate time for thread measuring wires to normalize. Use a normalizing plate adjacent to the measuring equipment.
|Attribute||Normal Laboratory Conditions||Optimum Laboratory Conditions|
|Wire Diameter||0.000025”/ 0.00064mm||0.000015”/ 0.00038mm|
Thread Check Inc. www.threadcheck.com email@example.com
BSPF = British Standard Pipe Fitting is an obsolete designation which has been replaced with the G-Series per ISO 228
BSPF was the thread marking per screw thread designation BS-2779. BS-2779 has been rescinded and should no longer be used. The new screw thread designation is specifies a G in front of the nominal diameter and is defined in ISO-228.
In March 2003, the British Standards Institute withdrew BS-2779 and replaced it with ISO-228 (technically BS-EN-ISO-228)
Example: G1/2 x 14 BSPP Go Thread Ring Gage - Class A
Class A is considered the standard tolerance. Class B is a loose tolerance twice the amount of Class A. Class B only refers to the No Go Thread Ring Gage
There are many drawings that call out British Standard Pipe (BSP) to refer the current G-series screw thread. It should always be confirmed as BSP may also be a shortened version of BSPT -British Standard Pipe Taper.
For more information on British thread gauging you may contact firstname.lastname@example.org or visit our website
Thread Check Inc. located on Long Island New York is now using solar power to handle up to 80% of its electricity consumption at its New York facility. The solar power system was designed and installed by GreenLogic Energy of Southampton NY. The system is designed to handle 47.775 K utilizing 195, 245 Watt Canadian Solar, panels.
The electricity is produced from sunlight using what are known as photovoltaic cells. These cells are built into thin glass-like panels of silicon material that have been mounted on top of Thread Check’s facility. The panels produce electricity when exposed to sunlight. Solar Panel systems are extremely reliable with no moving parts and typically last 30+ years with no maintenance.
The electricity produced by the solar panels produce can either be directly used in their offices and factory or sent back to the utility company for credit. To accomplish this, the power coming off the panels goes through a device called an inverter. The inverter monitors the solar power system, conditions the power, and keeps track of how much electricity is produced and then feeds the power to the appropriate place.
The system incorporates a web portal that monitors the energy and efficiency of the system in real time.
The life time carbon reduction is 3,030,509 Lbs. of Co2.
It is the equivalent of planting 19 Acres of trees.
Pg Steel Conduit Thread Plug Gages per DIN 40431 Steel Conduit Thread Gauges
Pg Steel Conduit Threads are manufactured per DIN 40430 Steel Conduit Thread Dimensions.
The Steel Conduit Thread Plug gauges are manufactured per DIN 40431.
The Pg thread series is designed specifically for the thin wall cross section of the steel conduit. The thin wall thickness requires a shorter profile thread that will not break through the outside diameter of the steel conduit during the machining process. The Pg conduit thread form features an 80° included angle and a shorter profile than the 60° included angle found in the Unified National thread series and the Metric thread series.
Pg Steel Conduit Thread Gages per DIN 40431 Steel Conduit Thread Plug Gauges
The DIN 40431 standard for P1 steel conduit threads specifies the requirements for using Go thread plug gages and plain NoGo plug gages to inspect the conduit threads. The plain NoGo plug gage checks the minor diameter or crest of the thread and verifies that minimum material condition is met. The Go threaded plug works normally by ensuring the maximum material condition is met.
Using the Pg Thread Plug Gages:
The Go threaded plug gage must be capable of being screwed by hand without undue force over the full length of the threaded work piece.
The NoGo plain plug gage must not be able to pass over the threaded work piece
Contact email@example.com for more information
Pg Steel Conduit Threads are manufactured per DIN 40430 Steel Conduit Thread Dimensions.
The Steel Conduit Thread Ring gauges are manufactured per DIN 40431.
The Pg thread series is designed specifically for the thin wall cross section of the steel conduit. The thin wall thickness requires a shorter profile thread that will not break through the outside diameter of the steel conduit during the machining process. The Pg conduit thread form features an 80° included angle and a shorter profile than the 60° included angle found in the Unified National thread series and the Metric thread series. .
Pg Steel Conduit Thread Ring Gages per DIN 40431 Steel Conduit Thread Gauges
The DIN 40431 standard for P1 steel conduit threads specifies the requirements for using Go thread ring gages and plain NoGo ring gages to inspect the conduit threads. The plain NoGo ring gage checks the major diameter or crest of the thread and verifies that minimum material condition is met. The Go threaded ring works normally by ensuring the maximum material condition is met.
Using the Pg Thread Ring Gages:
The Go Threaded ring gage must be capable of being screwed by hand without undue force over the full length of the threaded work piece.
The NoGo plain ring gage must not be able to pass over the threaded work piece.
The .0025" Master Calibration Pin Gage is ideal for calibrating ultra-precise measuring equipment such as laser micrometers. The micro pin gage is supplied with ISO 17025 accredited calibration providing the actual measurement. The diameters of these pin gages are approximately half the diameter of a human hair.
- Thread Check Micro Pin Gage material is E52100 Tool Steel hardened to Rockwell C60-62.
- Thread Check Micro Pin gages are 2.00" in length with ends ground square
- Micro Pin Master Calibration Pin Gages are ground and lapped to a 5 micro finish or better
- Traceable to NIST and supplied with ISO 17025 accredited calibration
800 767 -7633
631 231 - 1515
Thread Check Inc.
900 Marconi Avenue
Ronkonkoma, New York 11779
Thread Check Inc. manufactures a wide range of standard and custom tapered pipe thread gauges including NPT, ANPT, NPTF, BSPT, NGT and API working gauges. Tapered pipe thread gauges are critical to ensuring component parts assemble and seal properly. Tapered pipe thread gauges are supplied in different styles to inspect size and taper.
Methods of Gauging NPT Threaded Product
L1 tapered pipe thread plug gauges are screwed up tight by hand into the internal pipe thread of the product. The thread is within the permissible tolerance when the gaging notch of the working L1 thread plug gauge is not more than plus or minus one turn from being flush with the end of the thread.
L1 tapered thread ring gauges are screwed up hand tight on the external thread of the product. The product thread is within tolerance when the gaging face of the working ring gauge is plus or minus one turn from being flush with the end of the thread.
Limit type plug and ring gauges are used to eliminate counting turns by which the gauge over or under travels to the basic surface. The gauges include the basic notch on the plug gauge and the basic surface on the ring gauge and in addition include two notches or steps on both the plug and ring gauge. The one notch is considered the minimum and the other the maximum. The basic step on the gauge provides a means for checking against the master and reference gauges as well as a means for checking the maximum and minimum steps
Methods of Gauging ANPT and NPTF Threaded Product
The internal thread is first gauged with the L1 tapered thread plug gauge and the gauging notch which most closely represents the size of the thread is noted. The three product threads beyond the L1 are called the L3 length and are the additional threads which will be engaged when the pipe is tightened with a wrench or “wrench tight”. These threads are next gauged with a L3 tapered thread plug gauge. This is also considered a limit type gauge with the length equal to L1 plus the L3 but which has four threads at the small end only. For the products threads to be qualified on the L3 thread plug gauge, the position of the gauging notch must coincide within a ½ turn of the position previously noted on the L1 thread plug gauge. The L1 and L3 together check the lead, taper, pitch diameter, and major diameter.
The minor diameter of internal tapered threads is determined by the amount of truncation of the thread crest. As the truncation and pitch diameter varies within the limits, so will the minor diameter vary and for this reason it is customary to refer to the minor diameter as at maximum truncation or minimum truncation. There are also 3 pitch diameter gaging positions: basic, minimum, and maximum which requires three pairs of maximum and minimum truncation steps, or a total of 6 positions.
To gauge the minor diameter, a 6 step plain plug gage is always used in connection with the L1 tapered thread plug gage. The L1 gage is used as a guide to determine the gaging position. If the basic gage notch is flush with the end of the product, the threads are considered to be basic. The plain plug gage used on the same fitting should show the end of the product at or between basic maximum and minimum notches.
ANPT and NPTF external threads are first gaged with a thin L1 taper thread ring gage. Observe the small end of the gauging face of the ring to the small end of the pipe. The L2 tapered thread ring gauge is used to gauge the effective external threads beyond the L1 location length. The gauge is relieved by counter boring at the small end to a depth equal to L1 minus 1P. The L2 is used like the L1 gage is used, by counting the number of turns by which the product threads over travel or fail to reach basic. The two gages together inspect the lead, pitch diameter, taper and minor diameter. When both the L1 and L2 ring gauges are used, the relative position at the small end of the pipe and the basic gauging face of the rings may not vary more the ½ turn.
The 6 step taper plain ring gauge checks the truncation of the crest at the major diameter. Three of the steps represent the minimum truncation for the basic maximum and minimum thread sizes – B, MN, MX. The other three represent the corresponding maximum truncation.
The 6 step plain ring is used similar to the 6 step plain plug. The ring is always used with a limit type thin L1 ring gage.
Thread Check Inc.
900 Marconi Avenue
Ronkonkoma, New York 11788
800 767 7633
631 231 1515
System 21 specifies for interchangeable assembly with reference to functional size only. System 21 specifies that functional size must be measured at the maximum material limit within the length of standard gaging elements. System 21 requires that the NO GO functional diameter must also be verified. This can be accomplished by using a fixed limit gage such as a GO/ NO GO thread plug gage or a variable gage with functional elements such as thread rolls
Metric threads per ANSI B1.18M
System 21A specifies for interchangeable assembly with functional size verified at the maximum material limit using standard length gaging elements. This can be performed by using fixed limit gaging such as GO/NOGO thread plug gages or with variable gaging through the use of functional elements. System 21A also requires that the minimum pitch diameter (minimum material limit) be verified by inspecting two thread flank location over the length of the thread. This can be performed with a variable gage or a thread roll snap gage with pitch diameter elements.
System 22 specifies for interchangeable assembly with functional size verified at the maximum material limit using standard length gaging elements. This can be performed by utilizing fixed limit GO/NOGO gaging or variable gaging with functional diameter elements. In addition System 22 requires the verification of the minimum pitch diameter (minimum material limit) over the full length of the thread. This can be performed by using variable gaging such as pitch diameter elements.
System 23 specifies for interchangeable assembly with functional size verified at the maximum material limit using standard length gaging elements. Minimum pitch diameter (minimum material limit) must be verified over the full length of the thread. System 23 includes all the requirements of System 22 as well as the independent verification of lead, flank angle, taper and roundness.
631 231 1515
800 767 7633
The QUICKCHEK is available in an 8.0" or 16 inch model.
Thread Check, Inc., a Thread Gage Designer and Manufacturer, Expands Website Product Line on www.threadcheck.com
Ronkonkoma, NY, August 25, 2013 — Thread Check, Inc. a leading firm that designs and manufactures high quality gauging and inspection equipment for industries that perform precision manufacturing and dimensional inspection, announced today that it has expanded its product line on the Company’s website threadcheck.com. The firm now offers industrial trade text books, and manuals to a diverse group of customers in industries such as aerospace, automotive, pharmaceutical, petroleum, medical and mechanical contracting. Subjects include Measuring, Manufacturing, Engineering, CNC, Materials, and Design.
Thread Check, Inc. offers a complete line of custom gages, cylindrical ring gages, patented 3 wire thread measuring systems, plain plug gages, API gages, hex plug gages, Mitutoyo tools, Starrett hand tools, Mahr Federal Instruments, power drive thread gages, hardness testing equipment and ISO 17025 registered calibration services. The firm also provides quality support to educational and scientific institutions, the military and other government bodies.
To better serve their customers, Thread Check, Inc. has introduced their new online selling tool, the Thread Check Industrial Press Publications Online Catalog. The list of book publications includes but is not limited to architecture and design instruction, welding and electrical application texts, manuals for engineers and machinists as well as materials selection guides.
“Our company is highly responsive to our client’s needs and continuously adds new items to our product line,” states Richard Davey, Marketing VP, Thread Check, Inc. “In addition to providing superior technical support we have realized there is also a need for additional instructional and technical publications. Now we have expanded our product line to include the texts and manuals necessary to further assist our customers in the use, operation and maintenance of the precision equipment they purchase,” Davey concludes. What’s next? To further enhance their customers’ shopping experience, the company plans to expand product descriptions to include comments and ratings from customers who have purchased gages, measuring instruments and calibration equipment from threadcheck.com.
As an ISO 9001 accredited company, Thread Check, Inc. is committed to delivering total customer satisfaction by providing high quality products and superior service levels. Through a highly skilled and dedicated workforce, the firm has generated an outstanding service record, providing customers the assurance that their high quality products will accurately meet agreed specifications. Their product line includes hex plug gages, hardness testing equipment, 3 wire thread measuring systems or other custom gages. Additionally, Thread Check’s Customer Service Team is available with expert support and innovative solutions the company guarantees will surpass their customers’ expectations.
About Thread Check Inc.
Thread Check, Inc. is a full service gage company offering a complete line of precision thread plug and ring gages, plain cylindrical plug and ring gages, custom gages, patented 3 wire thread measuring systems, API pipe gages, tri roll thread comparators, powerful thread engineering software, gear measuring wires and instruments, cutting tools, master discs, ISO 17025 Registered calibration services and free technical support. Thread Check, Inc. offers a complete line of AGD - American Gage Design, unified and metric thread gages. Thread Check Inc. manufactures thread gages to ANSI/ASME and many international standards including ISO, DIN, BS, and API gages.
As an ISO 9001 accredited company, Thread Check, Inc. is committed to delivering total customer satisfaction by providing high quality products and superior service levels. The company’s highly skilled workforce has generated an outstanding service record, assuring that all their high quality gaging and measuring instrument products will accurately meet agreed specifications from thread gages, cylindrical gages, hex plug gages, hardness testing equipment, 3 wire thread measuring systems or other custom thread gages.
FOR MORE INFORMATION:
1 (800) 767-7633 631 231-1515