## Buttress thread pitch calculator

Starts: Dimensions are in inches. Glossary Thread calculator: All calculated results are based on; Basic outside diameter, number of threads per inch, series designation and class tolerances.

## Where Acme & Buttress Thread Forms Are Used and Why

Making a thread that follow these specifications will ensure that it will work with threaded holes or shafts made by other manufacturers that follow these common specs. Outside diameter: This is the biggest diameter of the helical portion of a thread. The biggest external diameter of a Screw or the biggest internal diameter of a threaded hole. NOTE: The size of the hexagon of a bolt or nut has no relevance when defining a thread size.

TPI: Threads per inch The number of thread, or "V"s along a one inch length which in turns, defines the size of the "V" shape of the helical portion of a thread.

NOTE: If the length of the threaded portion of a screw or threaded hole is shorter or longer than one inch, the size of the "V" shape is still defined by the number of thread that would fit along a one inch length. It also plays a role in determining the length of engagement. UN: standard series thread. UNC: coarse thread series. UNF: fine thread series. UNEF: extra-fine thread series. UNS: special thread series. UNR: standard series thread with rounded root.

The class tolerance determines the size of the gap between the pitch diameters of the internal and external thread. Most commonly used are the classes 2A and 2B. Most screws have only 1 but a thread with multiple starts advance a greater distance for each turn. Definition: This is the standard way of defining a screw thread. Can be a fractions, screw number 0 - 12, or a decimal number. Can be a decimal number such as 4.

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UNS: Thread series designation. It does not need to be specified for 1 start threads.

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Wire Diameters: Diameter of the wires used to measure the dimension close to the pitch diameter the external screw thread. Length of engagement: Basic length of thread engagement that is defined by a combination of thread series, pitch and diameter. Not to be confused with the length of a thread V-Shape: Pitch: The distance between 2 adjacent "V" shapes.

Real pitch: The distance between "V"s after following a helical path around the diameter of the screw.

Crest flat: Maximum and minimum size of the flat at tip of each thread pitch. Crest radius max: The maximum radius that will fit on the minimum crest size. Root flat: Maximum and minimum flats at bottom of "V" that will allow the greatest range. Root radius: Maximum and minimum radius that will allow greatest range. Thread depth: Maximum and minimum thread depth that will allow greatest range. Flank length: Maximum and minimum flank legth that will allow greatest range. Basic diameter:.

Dimensions are in inches. Major diameter:. Pitch diameter:.It utilizes two tungsten carbide contacts that fit in the threads of the pipe to make a more steady and solid fit of the gauge into the pipe thread. It utilizes four tungsten carbide contacts that engage the thread grooves to make a more steady and solid fit of the gauge into the pipe thread. It is stabilized in the thread by a specially designed body equipped with three. While in use, the measuring point can then remain in the root of the thread for an accurate run-out reading.

The body is stabilized in the thread grooves through the two specially designed Tungsten Carbide contacts, allowing the measuring point to record a true run-out reading of the thread root near the triangle marking.

A special feature specifically for Buttress Casing, is that the measuring contact is located closer to the back of the anvil. The measurement taken then indicates the deviation from the API Nominal, not the actual thread height.

This gauge also features a Revolution counting hand on the indicator and is equipped with a Tungsten Carbide Ball Point. This special design utilizes a locator pin and an indented anvil to allow the 36 Degree Cone Point to rest perfectly at the root of the thread in order to get the most accurate reading.

The measurement taken then indicates the deviation from the nominal, not the actual thread height. This gauge also features a Revolution counting hand on the indicator.

This gauge also features a Revolution counting hand on the indicator and is equipped with a 1. Description: This GM is used to record a measurement of groove eccentricity.

It is specially equipped with cylindrical contact point, which enables a firm contact with the groove. The measurement shown indicates the actual thread height relative to the bottom of the groove. A measurement can be made either by rotating the coupling while measuring or by obtaining several different readings. Toggle navigation Allen Gauges. More Info About Thread Height. Box Pittsburgh, PA Email: info allengauges.The present invention pertains to an improvement in buttress-threaded tubula connections.

In particular, the connection is improved by controlling a particula combination of dimensional tolerances of the connection thread elements in a manner whic provides a thread bearing contact pressure which is relatively constant over the entire length of the connection. Threaded connections joining discreet lengths of steel pipe are used in many applications. The art of tubular connections is particularly well established for steel pip used in the forms of tubing, casing, and drill pipe in the oil and gas well industry, an known collectively as oil country tubular goods OCTG.

There are numerous patent related to oil country tubular goods. Oil and gas exploration and production companies have continued to expand th boundaries of depth, pressure, corrosive nature of fluid produced, and perhaps mos important, economic criteria used to justify well development. These factors contribute t more stringent requirements for the material properties of the steel tubes used and th connections which join those tubes.

For example, thirty years ago, users considered stee with yields of 80, psi to be high strength steel.

Today, users routinely employ suc steels and consider yields ofpsi and higher not uncommon. Thus, it has becom important to adjust connection attributes to function better in combination with the steel available today and under the production conditions and economic conditions of today.

Thirty years ago, at the time buttress threaded connections joints were improve to reduce the hoop stress developed toward the ends of connections or couplings, th machining of the connections was typically carried out using "chaser" type manual machin tools to achieve mass-production economies. Today, the development of computer numerically-controlled CNC machines has led to the utilization of "single-point" cutting tools able to mass produce metal shapes.

These CNC machines have the capability of far more accurately, and repeatedly, reproducing the intended design dimensions of any given connection. Coupled with advances in other technologies, such as precision measuring instruments, anti-galling metal treatments, and sophisticated assembly equipment, one can deliver a vastly improved product compared to the ones previously produced.

The goal of connection designers has been to develop connections capable of performing under demanding mechanical conditions which place the connection under high stresses, while providing a reliable seal against leakage of fluids through across the threads of the connection. In addition, it is highly desirable that the assembled connections be capable of being broken apart and reassembled without a significant reduction in performance characteristics of the connection.

Patent No. Frame, issued October 24, discloses a leak-resistant pipe joint thread comprising a threaded female member, a complementary threaded male member engaging in threaded relation with the female member, and means providing a plurality of helically extending line seals between substantially each of the mating threads of the members.

Preferably, the load flanks trailing flanks of the thread on the male and female members are surfaces bearing against each other, while clearances exist between at least portions of the remaining thread surfaces.

The helically extending line seals are provided by a plurality of helically extending raised ribs on each root surface of the threads of the male and female members. Such raised ribs can be used on all thread surfaces other than the bearing load flank thread surfaces, if desired.

The combination of the pipe and coupling threads are substantially complementary and have flat crests and roots, the threads being narrower than the thread grooves. The load-bearing flanks of the pipe and coupling threads are substantially normal to the longitudinal axis of the pipe and coupling. The roots and crests of the coupling threads are parallel to each other and on a taper relative to the longitudinal axis of the connection throughout the length thereof.

The roots of the pipe threads are parallel to the roots and crests of the coupling and are on a taper relative to the longitudinal axis of the connection, throughout the length of the pipe threads; however, the crests of the pipe threads are parallel to the roots of the pipe threads for only a portion of the length of the pipe thread, providing a plurality of fully formed threads and vanishing threads, with the vanishing threads being at the junction with the unthreaded portion of the pipe.

The crests of the coupling threads are parallel to the roots of the pipe threads and the roots of the coupling threads are parallel to the crests of the fully formed pipe threads, the mating threads on the coupling being at least as long as the total length of fully formed and vanishing threads on the pipe.

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The entire surface of the flat crests of the coupling threads are in engagement with the roots of the pipe threads throughout the full length of the fully formed and vanishing pipe threads; the entire surface of the flat crests of the pipe threads are in engagement with roots of the coupling threads throughout the full length of the fully formed threads on the pipe.

Franz, issued November 5, describes buttress threaded joints for oil well tubing which provide a drop in the hoop stress development toward the end of the joint coupling during power-make-up, permitting the safe use of higher working stresses. In particular, the threaded connection pipe joint disclosed comprises a pipe member having a cylindrical outer surface and a tapered buttress thread at the end thereof.

The tapered buttress thread vanishes along the outer cylindrical surface of the pipe, providing a length of fully formed and a length of vanishing threads. The connection member corresponding with the threaded pipe member is a coupling member having a complementary thread on the internal surface thereof, the complementary thread being fiilly formed throughout the length thereof and at least as long as the total length o fully formed and vanishing threads on the pipe.

The complementary threads on each connection member have following-flanks in bearing relationship and substantially normal to the longitudinal axis of the joint and leading-flanks in bearing relationship, wherein the leading-flanks have a larger flank-angle than the following flanks. In particular, the following-flanks have a flank angle ranging between 0 degrees and 8 degrees for steel having a yield of 80, psi and greater and a flank angle ranging between 0 degrees and 1 degree for steel having a yield strength below 80, psi.The basic height of thread engagement for buttress thread is 0.

The buttress thread form has certain advantages for the applications where high stress occurs only in one direction along the thread axis. The buttress form of thread is particularly applicable when tubular members screwed together. Breech assemblies of large guns, airplane propeller hubs and columns for hydraulic presses are some of the examples of buttress threaded rods and nuts.

### METRIC THREAD DIMENSIONS CALCULATOR

The standard provides information about preferred diameter-pitch combinations, formulas for calculation pitch diameter tolerances, tolerances for major and minor diameters, a system of allowances between external and internal threads, recommended methods of measuring and gauging, dimensional acceptability of buttress threaded rods and nuts. Note: For more information on buttress threads including diameter-pitch combinations, thread designation, basic dimensions, formulas, thread tolerances and allowances for easy assemblyplease refer to pages - of Machinery's Handbook, 30th.

Note: 1 Tolerance on major diameter of external thread, pitch diameter of external and internal thread, and minor diameter of internal thread. Allowance: An allowance clearance should be provided on all external threads to secure easy assembly of parts. Major Diameter: The maximum diameter of a thread which is diameter of the crest of a male thread or root of a female thread.

Minor Diameter: The minimum diameter of a thread which is diameter of the root of a male thread or crest of a female thread. Roots of Threads: There are 2 alternatives for thread roots. These are rounded and flat roots. Rounded Roots: Equal radii, at the roots of the external and internal basic thread forms tangential to the load flank and the clearance flank. The rounded root form of the external and internal thread shall be a continuous, smoothly blended curve within the zone defined by 0.

The resulting curve shall have no reversals and sudden angular variations, and shall be tangent to flanks of the thread. There is, in practice, almost no chance that the thread forms will be achieved strictly as basically specified, that is, as true radii.

Flat Roots: Equal flat root of the external and internal thread. In instances where absence of root radius is not detrimental to the requirements for strength, and where it is more economical to provide tools which do not produce a radius at root, flat root buttress threads may be specified. Nominal diameter inches - threads per inch. Thread Tolerance Class 1.Manufacturing custom threads and mechanical processing of highly customised special parts.

## Buttress Fine Thread DIN 514

Calculate the most suitable lead screws with our Online Calculation Tool. The profile of a buttress thread or saw thread resembles a saw tooth. We also manufacture your buttress threads and saw threads with custom sizes or out of any material you desire. Many customers chose C45 steel or higher steel grades such as 42CrMo4.

We also offer any special coating for your buttress thread such as thin dense chrome plating or phosphating. The corresponding buttress nuts are often made of aluminum bronze. However some heavy duty lifting applications may also require tougher grades such as manganese bronze. Screws with a buttress thread profile are mainly used in vertical lifting applications where the load is firmly supported on the upper flank of the screw thread.

The asymmetrical profile of the buttress thread, makes them suitable for bearing extremely high, single-direction axial loads and their load capacity is far higher than that of common Acme screws or Trapezoidal screws. Therefore buttress threads are commonly used as:. Here are the nominal dimensions for buttress threads and saw threads according to DIN specifications and a sample technical drawing:. You can leave the technical conversion of your vision into an actual finished buttress thread to us.

Simply send us a technical drawing or rough sketch with some dimensions and we will do the rest. Use our online screw dimensioning tool and calculate all the technical data for your individual thread profile.

Calculate the most suitable lead screws with our Online Calculation Tool Save time and costs by selecting a thread profile that matches your specific requirements. Start Calculation Tool. Buttress Threads at Work. Therefore buttress threads are commonly used as: Screws for friction screw presses Lifting screws for heavy lifting equipment Lead screws or power screws in machines with high loads Transmission threads in turning and milling machines Screws in artillery equipment.

Save time and money Directly send your inquiry to us Receive your commercial offer within a few days.Acme and Buttress threads are extremely useful for the lead screw shaft of various assemblies. Specifically, for assemblies thatmove efficiently either for load bearing or accuracy. We can see the lead screw shafts in some equipment; however most are hidden from sight.

For example, lifting pallets, marking and labeling machines, medical diagnostics and personal mobility, off road equipment, and machine tools, all require load bearing or accurate movement which can be provided by devices that use a lead screw mechanism.

The thread forms normally required for lead screws are shaped to offer high strength and accuracy. Acme is the most popular trapezoidal thread form worldwide for lead screws. Although square threads are the most efficient, they remain difficult to produce. They can be produced with multiple start threads, left hand threads and self-centering threads.

Regal offers standard sizes of Acme taps and manufactures many variations of special purpose taps usually coarse pitch Acme forms. The buttress thread form is designed to handle extreme high axial thrust in one direction. Regal manufactures this style to customer specifications in twelve days or less. Contact us today to find out more information. Click here to see a larger image.

Whether you are a tool user or a distributor, subscribe to our newsletter for the latest metal cutting tool resources. Regal Cutting Tools revolutionized special tap manufacturing in by making special taps overnight.

Now the same processes are used for special drills and end mills so we can provide the fastest delivery possible. Skip to main content. Request a Special Tap. Request A Quote. From Our Customers.Metric thread calculator to calculate external and internal metric thread dimensions including major diameter, minor diameter, pitch diameter and thread tolerance according to ISO and ISO standards.

In general engineering use, calculations can be done by selecting a standard metric thread size in a range from 1. Tolerance class can be selected among the alternatives 6e, 6f, 6g and 4h for bolts and 5H, 6H, 7H and 6G for nuts. The user shall use 6g for bolts and 6H for nuts unless there is a specific requirement to use other tolerance classes. In custom use, thread size, pitch and tolerance classes can be independently selected for custom metric thread dimensions calculations.

M10 x 1 6g. The list of metric screw thread used in general engineering applications are given in the General Purpose Metric Screw Threads Table. Note: For more information on Metric screw threads including thread form, definitions, limits and fits for threads, standard series and combinations, thread designation, basic dimensions, dimensional effect of coating, formulas and details of MJ profile, please refer to pages - of Machinery's Handbook, 30th.

Use this tolerance class for commercial external bolt threads. For usage of the other classes, refer to ISO Use this tolerance class for commercial internal threads.

Note For coated threads, the tolerances apply to the parts before coating, unless otherwise stated. After coating, the actual thread profile shall not at any point transgress the maximum material limits for positions h or H. For external bolt threads; The actual root contours shall not at any point transgress the basic profile.

Fasteners of property class 8. Basic profile: The theoretical profile of a screw thread in an axial plane defined by theoretical dimensions and angles common to internal and external threads. Crest: The surface at the top of the ridge connecting its two flanks. Gauges and Gauging: Details for the manufacture and use of gauges for checking ISO general-purpose metric screw threads are specified in the ISO standard. Major Diameter: The maximum diameter of a thread which is diameter of the crest of a male thread or root of a female thread.

Minor Diameter: The minimum diameter of a thread which is diameter of the root of a male thread or crest of a female thread.