The FTS has a thread pitch of 1. Motivation for Interest in Issue Interest in the techniques used and the results. Thread Root Area sq. Load in Newton F, square thread pitch distance l in mm & torque T in Nm are the key terms of this calculation. This distance is commonly called the "pitch" of the thread. 3 Basic profile 3. M6 x 1 6 - 1 = 5mm and you thought metric was difficult ;-) Thanks to Jay Steinbuchel of Barksdale Control Products for the following: This works for all 75% threads, not just metric. Please use only numbers (e. Threads and Materials (continued) Thread Limiting Dimensions - Class 4g6g Metric Threads Nominal Diameter And Thread Pitch Tolerance Class Allowance ES Major Diameter Max. Basic Thread Height. x ±halfangletol. Although the helix angle is not commonly altered from the standard square pitch, such a change can have a significant impact on processing. There is no torque difference for fine or coarse threads. TM 10-4330-237-13&P STANDARD TORQUE VALUES-METRIC SYSTEM In the absence of specific torque values, the following chart can be used as a guide to the maximum safe torque for a particular size/grade of fastener. 132 Technical Tapping Formulas and Calculations ! " Title. Measurements must be taken parallel to the thread axis. The finer the pitch, the closer the threads are together. Calculate the gradient and length of a wheelchair ramp. ACME Thread Depth = Pitch x 0. Geometric calculators 20. If metric thread pitch designation (e. ) If you normally work with inch fasteners, pitch can be a little confusing—pitch is the distance between adjacent threads. An anvil dedicated to screw threads is also available. Pitch Diameter is the simple effective diameter of screw thread, approximately halfway between the major and minor diameters. Thread Pitch Calculator measures thread on your screen. Thread Stripping Areas sq. M6 x 1 6 - 1 = 5mm and you thought metric was difficult ;-) Thanks to Jay Steinbuchel of Barksdale Control Products for the following: This works for all 75% threads, not just metric. Thread gages are used to ensure the assembly of mating parts. In cutting threads on a lathe what calculation or formula does one use in order to determine the amount of compound feed travel to use? My manual from 1st year machine shop (going way back) said for a 75% thread to divide 0. 8750 10 - 12 1. Specials available on request. Using the Three-Wire Method to Measure Threads The pitch diameter of a threaded object can't be measured directly except with specialized thread micrometers. Gear Size Calculator. : ISO 2901 ISO metric trapezoidal screw threads - Basic profile and maximum material profiles. The pitch of a screw thread is a measure of how closely the threads are spaced. As of 12/26/2017, academic. 86 drivers off of my 08 TNT mtn mod are 7. Thread pitch is the reciprocal of threads per inch. ISO Metric Theads. Gear Size Calculator. Custom Macro info. The app generates NC code with G76, G32, G33, G92 and CYCLE97 G76 cycles are calculated with one or two lines and for Mach3 controllers. Shell is slightly larger, thread pitch slightly coarser. You can measure Whitworth (BSW)threads, UN threads, ISO metric theads, Trapezoidal, Acme, Stub Acme and National Pipe Taper threads. By maintaining a constant pitch, the depth of the thread, measured from crest to root, will also remain constant. A double start thread will have a lead distance double that of a single start thread of the same pitch, a triple start thread will have a lead distance three times longer than a single start thread of the same pitch, and so on. Results You searched for: UN - UNIFIED (UNC, UNF, UNEF, UNS) Results Displayed: 1 - 30 of 167 ». thread free download - Thread, THREAD, Intel Thread Checker, and many more programs A calculator for thread cutting for the following units: M, MF, UNC, UNEF, UNF, UNR, UNS, NPT, NPTF, NPSC. If you find product , Deals. The table below generally defines the terms. 050 inches for 1/2"UNF. Constant Pitch Series : Constant Pitch Series, The constant pitch series, UN, have 4, 6, 8, 12, 16, 20, 28, and 32 threads per inch. divided by the belt pitch (ie the. 1 mm, while the CTS has a pitch of 1. The machine can be programmed to helically interpolate to the desired diameter. 050 pitch ( 1 divided by 20 ) or if you are measuring in metric. Shop a large range of starrett pitch measuring tool at MSC Industrial Supply. Supported thread list: • Metric thread sizes • US thread sizes • NPT • BSPT • Metric Screw sizes • SAE Screw sizes. A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. Use as a reference tool in determining the pitch of a thread that is on a screw or in a tapped hole. The following is a very simple pitch and lead calculator, given the number of starts and the number of threads or turns per inch of a lead screw. The fine thread screw (FTS) (Oasys (Stryker)) and the cancellous thread screw (CTS) (Axon (Synthes)) were each designed for lateral mass fixation. The nut and bolt material are not the same. Buttress threads are threads with two different flank angles and these are standard but with various different flank angles. He resides in Nebraska which is only 1000 ft. You probably will not want to do this every time as it will greatly increase the part size and load time, but it is necessary if you plan on 3D printing or molding your part. ¥ Casco, WI 54205-0125 USA. Advent Tool and Manufacturing, Inc. Sherline offers a unique and versatile thread-cutting attachment for its lathe. TPI = Threads Per Inch. An ACME thread has a screw thread profile with trapezoidal outlines and they are commonly used where large loads or high accuracy are required; for example, in a vice or lead screw. ISO 2902 ISO metric trapezoidal screw threads – general plan. The processor software receives and processes information received from the caliper to calculate the thread pitch diameter. DIAMETRAL PITCH Diametral Pitch is the Number of Teeth Per Inch of the Pitch Diameter FOR SPUR GEARS ONLY Diametral The Circular Pitch Divide 3. Adapters that have both internal and external threads are available, as well as adapters with two sets of internal threads or two sets of external threads. I am provided with the inside diameter (hole) and the outside diameter. thanks for any help guys, Travis. I don't know how to calculate the tolerance for a class 3 thd. Triangle Solver 21. Measure the pitch of the screw. Pee Dee Thread. The reason I need a formula is I don't know the dimensions of the various parts of the helix from one development to the next. 062x28tpi threads. But using three wires of the same known diameter, the thread pitch can be measured with a standard micrometer. The major diameter of common threads is the same size as available material. The three wires are mended at an accurate diameter to touch the thread in proximity of the pitch diameter. Undergraduate Design & Manufacturing Lectures & Spreadsheets (xls) MANUFACTURING SYSTEMS - Author: S. All too often component parts are manufactured without taking into account the correct plating requirements. Made from Solid Micro-grain Carbide, Tapered Neck and fillet radius provides maximum rigidity, All shanks have a lockdown flat for faster setups. ISO 2902 ISO metric trapezoidal screw threads – general plan. To measure thread pitch, use a caliper and measure from the peak of one thread to the next. Mechanical calculator to calculate the shear area of the internal thread (Screw or Fastener) which depends upon minor diameter of the tapped hole. If that places the last level of hits on some yucky threads, either reduce the start to. Unified and ISO Thread Geometry Pitch (p) – The distance between adjacent thread forms measured parallel to the thread axis. The thread pitch diameters are 0. 1445 Commerce Avenue Brookfield, WI 53045 1-800-776-6170. All dimensions are in inches. The number of turns of a thread guage is also shown. Heli-Coil screw thread inserts Heli-Coil inserts are preci-sion formed screw thread coils worked into a diamond shape. Thread gages are used to ensure the assembly of mating parts. Thread Size Chart. 5 mm thread pitch 2. , the most common are detailed below. couldn't find an answer to this anywhere on here so I'm hoping someone can help. Thread Calculator, free thread calculator software downloads. ISO Metric Thread Tolerance Tables. And this line intersects the flank in such a way such that the width of the threads and the spaces between the threads during their engagement is same, In this case it makes a PERFECT thread. For internal threads either use set plugs or the ball method, as appropriate. Diameter is in either Inches ( not decimal ) or Millimeter. It is based in concept on Screwmez by Pete Worden (described in Model Engineer's Workshop issue 246), but has been written from scratch to be a web-based application usable on any operating system. Essentially, slip is no more than the difference between a propeller’s theoretical pitch and its real-world, in-the-water progression. These are available for use when the Coarse, Fine, Extra-Fine Series do not meet the design requirements. It always makes sense to the standard roof pitch angle spot on as the benefits of doing so are quite obvious; with the help of these roof pitch degree calculator programs you can make sure that your home is nice and balanced. Screw Thread Conversions. 866 x P (H = Basic triangle height) (P = thread pitch). If you want to find the roof pitch in the form of x:12, simply calculate the pitch and substitute 12 for the run length. These are the same thread sizes that have been used in aircraft and industrial applications for many years. Odd Pitch Threads ï, ñ, ó…. d1 Thread Major Diameter Thread Per Inch Pitch Diameter. As an example, if the configuration consists of two threads spiraling the stem instead of one, the lead is different from the pitch. Thread Stripping Areas sq. we will measure more threads per inch than in the course screw. 5 mm per thread. Said another way, if you intend to create a ¼" thread, be it 20 or 28 pitch, the material should be. Helix Methods standard helix method: Used when RH thread is cut with RH tool, or LH thread. It is based in concept on Screwmez by Pete Worden (described in Model Engineer's Workshop issue 246), but has been written from scratch to be a web-based application usable on any operating system. The pitch cylinder is an imaginary cylinder of such a diameter and location of its axis that its surface would pass through a straight thread in such a manner as to make the widths Of the thread ridge and the thread groove equal. Visit this page using a Phone or Tablet to directly measure pitch and angles. Mechanical calculator to calculate the shear area of the internal thread (Screw or Fastener) which depends upon minor diameter of the tapped hole. Mercury Fury Propeller 14 X 23 Pitch 48-8m8023100. I am provided with the inside diameter (hole) and the outside diameter. With this program you can calculate the worm gear dimensions if you know the pitch of the worm to be used. External threads can usually be produced within 1-1/2 threads from a shoulder and internal threads tapped to within 2-1/2 threads from a hole bottom. The thread pitch is the distance between threads expressed in millimeters (measured along the length of the fastener). Threads and Materials (continued) Thread Limiting Dimensions - Class 4g6g Metric Threads Nominal Diameter And Thread Pitch Tolerance Class Allowance ES Major Diameter Max. The steps below will guide you in creating realistic and accurate threads in SolidWorks. TDWIN Taper Setup Sheet Upper Arm Lower Arm Upper Arm Lower Arm MRP-2000. When I asked Vermont gage they said they put it into a program, but as I love the mathematics of machining, I need to know how they come. Since the helix angle is. Choose a metric thread size and pitch 2. Skip navigation Sign in. As of 12/26/2017, academic. The lead for a screw thread is the axial travel for a single revolution. 20 Pairs Parallel Set 1/32" Ultra Thin Steel Precision 0. 2-1974) SPONSORED AND PUBLISHED BY THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS United Engineering Center 345 East 47th Street New York, N. Bent Bolts We manufacture a variety of bent bolts including 90⁰ anchor bolts, U-bolt, eye bolts, hook bolts, and many other styles. The pitch diameter on a straight thread is the diameter of an imaginary cylinder that passes through the thread profiles at a point where the width of the groove and thread are equal. Internal 60° Thread Depth = Pitch x 0. The Nuts and Bolts of Specifying Fastener Torque. For example a thread pitch of 1. Thread Measuring Wires are used to measure the simple pitch diameter of externally threaded parts or to calibrate thread plug gages. α：Lead angle I：Lead n：Number of threads P：Pitch d：Effective diameter of thread. d1 Thread Major Diameter Thread Per Inch Pitch Diameter. 4 and hit the 1/x button on the calculator) and see if it comes reasonably close to one of the standard metric moduli of 0. 1-1989 specification. If that places the last level of hits on some yucky threads, either reduce the start to. Calculation of "Nut Factor", K. ASME/ANSI B1. Install nut before flaring. For example, attempting to measure metric threads with an imperial gauge will not return accurate results. With a mobile device, a button will appear. It depends on the interference between the truncated thread crests and thread root of the mating products to create a mechanical seal (See ANSI B1. Pitch Diameter Max. Calculate the length of your timing belt with B&B Manufacturing's belt length calculator. ) The distance from a point on the screw thread to a corresponding point on the next thread measured parallel to the axis. While this will allow you to calculate the pitch of the thread, you must know the number of starts on the thread in order to determine the lead for each start. M6 x 1 6 - 1 = 5mm and you thought metric was difficult ;-) Thanks to Jay Steinbuchel of Barksdale Control Products for the following: This works for all 75% threads, not just metric. Measure the thread diameter with an I. Coarse thread is beneficial, because they are less likely to cross thread, more tolerant in. Enter Run (the flat, level length) then click Pitch, Angle or Rise to select then enter other known dimension, angle or pitch. The resultant surface finish is a mirror-like 8-16 micro inches. I Dec / Met / Frac Dec / Met / Frac. 5 (coarse) thread has a 1. A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. NPTF: thread form is a pressure tight thread that is called Dry Seal and does not require any special sealant material be used. Read reviews, compare customer ratings, see screenshots, and learn more about Thread Pitch Calculator. Lead angle is the angle between the helix and a plane of rotation. Just what it says. Threading Gears - Calculator My machine is 4. The 1/4"-28 UNJF is a Unified fine pitch UNJ inch thread for aerospace. Thread Milling Mill-Thread Solid Carbide Mini Mill-Thread Hardcut DMT/DMTH - 3 in 1 MT Drill new Mill-Thread Indexable Slim MT new Spiral Mill-Thread CMT Vertical Milling CMT Multi Insert D-Thread Deep Reach. Each thread size has a defined number of threads per inch (TPI). Within these series, preference should be given to the 8, 12, and 16 thread series. The tool must have the correct thread angle. Thread Size Chart. 3B #0 - 80 UNF. Calculate the length of your timing belt with B&B Manufacturing's belt length calculator. power screw efficiency (η) calculator - step by step calculation, formula & solved example problem to find the efficiency of square thread power screw in mechanical engineering for power transmission. 4330 N Link St, Ste A Groves, TX 77619 ph 409. And this line intersects the flank in such a way such that the width of the threads and the spaces between the threads during their engagement is same, In this case it makes a PERFECT thread. For example; a 3/4" NPT pipe thread has an outside diameter of 1. When the change gears are set for inch threads the Metric Pitch table shows the metric equivalent. ANSI Standard Hardware Menu. En max = Maximum pitch diameter of internal thread. ISO 2902 ISO metric trapezoidal screw threads - general plan. 866 x P (H = Basic triangle height) (P = thread pitch). Let me know your transmission ratio. 42 National Pipe threads are similar in function to BSP threads, but are not generally interchangeable. ANSI Standard Hardware Menu. In above equation L is length of thread in cm. Pitch points on a gear could be found if a straight line were drawn up from two of the gear's teeth located side by side and the two lines were connected by a curve. The best thread repairs for cars and trucks depend on the type of thread affected and where it's located. what does the 'pitch' in a gear mean?? If this is your first visit, be sure to check out the FAQ by clicking the link above. By maintaining a constant pitch, the depth of the thread, measured from crest to root, will also remain constant. 5MM; 60° thread profiles and locking devices; Durable stainless steel. Pricing information ofMossberg 500 Ejector Screw Thread Pitch is provided through the listed merchants. The answer is in the question, the 20 is "threads per inch" (of length). The different rail sizes allow each MRP model to measure a specific range of diameters from 1 ½”-20”. 5, which is the recommended tap drill size. Enter your cutting data into this thread machining calculator to optimize your tooling approach in thread turning and thread milling applications. Things to Remember When Cutting Threads on a Lathe. thread relief 2 pitch minimum 3 pitch preferred maximum diameter equals nominal thread diameter minus constant b external thread relief pitch = 1. thanks for any help guys, Travis. Nominal size and threads per inch Series Desig nation External Internal Class Allow ance Major diameter limits Pitch diameter limits Max Min Min Max Min Tolera nce Minor diameter Class Minor dia. com carries a variety of nut and bolt gauges in stock and ready to ship. Core Dia Female. Disclaimer: Viva Access does not accept responsibility for the accuracy of this calculator and all calculations should be checked by the user against applicable regulations. For example, a bolt labelled M10 x 1. Where, D1 – Pitch Diameter of Worm. Working Thread Plug, Thread Ring and Thread Setting Plug Gages are manufactured to inspect the Pitch Diameter and the Functional Thread. Threading Gears - Calculator My machine is 4. We call this change “slip”. Be sure to use the actual wire size used, not the best wire size, in the Measurement Over Wires formula. 2mm/rev * 75 revs = 15. When comparing your measurements with the dimensions shown in this guide, remember threads can become worn and distorted from use. Determine: a. Metric Thread Pitch and Tapping Sizes. Reply Delete. PCD (Pitch Circle Diameter) is the measurement of the diameter of the imaginary circle drawn through all of the wheel bolts or studs on a wheel. The blank diameter of a rolled thread is at the pitch diameter, a theoretical point between the major diameter and minor diameter. The pitch diameter size of a screw thread on a straight thread is the diameter of the pitch cylinder. Five fresh human cervical spines were used. Borrowing aviation terminology, these rotations will be referred to as yaw, pitch, and roll: A yaw is a counterclockwise rotation of about the -axis. 3 for inch and B1. The next thing to do is calculate the correction factor for the actual pitch diameter and the effective pitch diameter based on the corrected wire size and measured diameter. ISO 2902 ISO metric trapezoidal screw threads - general plan. Where Acme & Buttress Thread Forms Are Used and Why Specifically, for assemblies thatmove efficiently either for load bearing or accuracy. n 5) Threading in blind holes When thread milling you will get a complete thread proÀle to the bottom of the. My account. Pitch is defined as the axial distance between adjacent threads on a helix or screw. 0600 inch to 2 inches Dimensions given by this calculator are at 68 °F per ASME B1. General industrial practice is to confine thread calibration checks to pitch diameter and sometimes major/minor diameter. Acme screw threads are now extensively used for a variety of purposes. I use the tried and true Shinpads Radar and Pain Management System. NPT Pipe Thread Depth = Pitch x 0. For example a 1/4-20 screw has 20 threads per inch and a diameter of 1/4 inch. For example, M10 or M10-6g, by default, specifies M10 x 1. For the mini-lathe banjo and with the original gear set plus 21, 55, 57 and 65 teeth. The turbo addiction mph/gearing calculator is the best one I have ever found. then take the remainder, and loop around the threads adding one to each. Where Acme & Buttress Thread Forms Are Used and Why Specifically, for assemblies thatmove efficiently either for load bearing or accuracy. The NPT thread measuring calculator will supply the pitch diameter at any point along the length of the thread. ALWAYS PRECISE Standard Pitch Diameter Chart 16 Plug Thread Gages NOMINAL SIZE UNIFIED PITCH DIAMETERS CL. Nominal Pipe Size Outside Dia. We used a program to calculate it for us. For example, if a screw has eight threads per inch, the pitch is 1/8. Disclaimer This data is provided for general information only. Index of thread series. Result will be the feed rate in inches per minute. US and Metric Thread Sizes mm 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 2. Easy to use. 866 p depth of a metric thread = 0. Thread percentage: (77% thread is what you want to use) A 100% thread is 3/4 qtr, or (6/8 th), of the full 60° triangle which is the maximum allowed height of a full thread, the "V" shape, including flats. Maximum Major Diameter (Table 3 - pg 1716) Minimum Major Diameter (Table 3 - pg 1716) Maximum Pitch Diameter (Table 3 - pg 1716) Minimum Pitch Diameter (Table 3 - pg 1716). Metric Screw Thread Chart Metric Tap Size Tap Drill in Inches Clearance Drill in Inches M1. Image courtesy of Lakeshore Carbide. 1 mm, while the CTS has a pitch of 1. There are two kinds of ISO metric threads: coarse and fine. Choose Tolerance grade for d2/D2. The default. are available from stock. Instructions: Choose your thread size from the drop-down menu or the slider. Thread Check, Inc. whereas effective diameter is the dimension that. Tapping Size. However, the thread plug gauge can only be used to determine whether the nut was manufactured successfully rather than to measure the value of the pitch diameter. Easy to use. Thread Size Chart. I need help with an ACME thread callout on a drawing. I am provided with the inside diameter (hole) and the outside diameter. US and Metric Thread Sizes mm 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 2. When designing machinery that uses lead screws, it's a common task to try and figure out the size of motor needed to drive a given force with a lead screw. Disclaimer This data is provided for general information only. Screw Thread Conversions. Helix Methods standard helix method: Used when RH thread is cut with RH tool, or LH thread. Metric Bolts. I may be showing my ignorance on this, but here goes!. Note that the resultant gear ratio is just the product of the two separate gear ratios - (T1/T2)*(T3/T4). I'm trying to figure out how to calculate the Angle [A], Pitch Diameter[P], and Circumferential Clearance depending on how many spheres are in the complement and inner diameter[S] and outer diameter[B]. The 3/4" NPT pipe thread has 14 threads per inch. Enter your cutting data into this thread machining calculator to optimize your tooling approach in thread turning and thread milling applications. By utilizing the gear calculator introduced here, it is possible to reduce these burdens substantially. MSC Industrial supply is here to support all your metalworking and maintenance repair needs with over 1 million products in stock and ready to ship today!. SolidWorks Threads. American Standard Acme Screw Thread Dimensions h = Basic depth of thread h9 = Depth of thread with clearance K = Tap drill Basic minor diameter of nut Fc = Width of flat at crest of thread Fr = Width of flat at bottom of space FOR 10 OR LESS THREADS PER INCH h9 = Pplus. Install nut before flaring. Coarse Thread Series (UNC/UNRC) is the most common designation for general application bolts and nuts. British standard pipe thread rate chart. Lead is the axial advance of a helix or screw during one complete turn (360°) The lead for a screw thread is the axial travel for a single revolution. UNJ carries this even further, so far that the minor diameter of the bolt is increased. Regrinding & Recoating service also available for 30% of list price for ThreadMills USA™ products. Max Axial Force in Tension: F axial,t: 0 : lb f x1000: thread shear pin: F shear,pin: 0 : lb f x1000: thread shear box: F shear,box: 0 : lb f x1000: thread bearing capacity: F bearing: 0 : lb f x1000: pin axial max force at thread relief. Nominal size and threads per inch Series Desig nation External Internal Class Allow ance Major diameter limits Pitch diameter limits Max Min Min Max Min Tolera nce Minor diameter Class Minor dia. The V-shaped thread form has a 60° flank angle and male and female threads are both parallel (Figure 3). D = major diameter p = 1/ thds per inch That should be the max pitch dia for external thds or the min for internal thds. Selecting fitting thread measuring wires and calculating test dimensions: By referring to the tables below you can approximately calculate and express the test dimensions for the measurement of outer threads using the three-wire method if the thread specification is known. Often, rolled threads are required by design because of their superior tensile, shear, and fatigue strength. Standard Pitch Diameter Chart /LSPJHS *VPS 7S\N. Thread Pitch Width across flats Width across corners Nut height Washer-face or chamfer dia. If number of start is greater than 1, Pitch = (number of start / Thread per cm). Three thread cutting cycles are provided: G32, G92 and G76. A563 provides the exact thread size limits when the allowances are added. 0002 0°30'. Un imperial screw thread calculator. Usage is simple. On the go? Download our Bolt Load Calculator app instead. 511 Main St. TPI = Threads Per Inch. Class Thread: Major Diameter: Pitch Diameter: Minor Diameter: Basic: Tapping Drill Size and Clearance Drill Size for Metric Threads Stainless Steel Weight. In above equation L is length of thread in cm. I have a new part and it calls for a. Thread Calculations. Screw Thread Conversions. THREAD MILLS Higher cutting speeds and feeds than tapping. Even Pitch Threads 2, 4, 6Etc: use any line on the threading dial. For example a thread pitch of 1. The thread pitch on a screw will usually be defined under various categories, such as standard, fine or extra fine. Determination of Pitch Diameter of Parallel Thread Gauges by Mechanical Probing 1 Introduction 1. Stub ACME Thread Depth = Pitch x 0. Thread Calculator, free thread calculator software downloads. Be informed and get ahead with. Triangle Solver 21. Pitch Diameter Max. Thread Pitch. 1) and than by interpolation (from my table) calculate pitch of your propeller. Since the helix angle is. Calculation of "Nut Factor", K. RACO International Actuator engineering formula. Third measure length Length is measured from behind the head to end,. thread , of course, with rollers of a given thickness can roll all the threads with a length less than the thickness itself. The process of threading is used to produce helix by removing material from circular surfaces. Thread drunkenness. By maintaining a constant pitch, the depth of the thread, measured from crest to root, will also remain constant. Export lathe G-code for chamfers, tapers, & radii with tool nose compensation. 25 is a fine pitch. Calculate and specify gear ratios. Determine the thread standard. 7384 fx 409. ThreadPal is a calculator for unified, unj, uns, acme, buttress, npt, metric, trapezoidal, whitworth, and bsp screw thread dimensions, plus special sizes. BSP threads have rounded valleys and troughs (this is known as Whitworth type). SOLIDWORKS 2016 introduced the ability to create helical threads on cylindrical faces.