All diameters are measured in either inches or millimeters. That is the reason why I need to represent it on my model. . I set the Tapped hole diameter to Tap Drill, I create an M6 threaded hole, I put the model onto a drawing, the full circle gives a diameter of 5 (I expect that to be 6), the thread line around the hole (which isn't a full circle) gives a radius of 3 (which matches with the M6) and the "Hole and Thread note" tool shows the appropriate information. = Lead angle (helix angle) of the thread. Threadlockers are special adhesives used in many industries and in many applications. Washers are often used with threaded fastener. Coarse and Fine sizes. Here's what I get with an M6 blind threaded hole, first with the minor thread diameter, and second with the tap drill diameter: I can see where using the tap drill diameter might be preferred (I was incorrectly thinking that tap drill would be slightly smaller than minor dia -- doh! A325 Bolt Dimensions Chart. In plumbing pipe size is referred to as nominal pipe size - NPS, or "Nominal Pipe Size". Blank Diameter = MAX thread pitch diameter - .002 inches [or .051 MM]. National Standard Taper Pipe Threads Size NPT Chart These Classes of Fit tell how precisely the threads must be machined and how tightly they will fit together. In addition, hole annotations, by default, do not reference the minor diameter nor the tap drill diameter; again, normal drafting practice assuming that the fabricator knows what they're doing in selecting the tap drill. The major diameter is the outer diameter at the top of the thread crests. NPT has a thread angle of 60 where BSP is 55. So if they were able to cut the threads so that the crest-to-crest diameter was the same as the original cylinder, then yea. Please dont think Im unappreciative of your efforts, theyre great. The nominal diameter of Metric (e.g. UNC, UNF And UNEF Thread Table | Optimas International <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 11 0 R 12 0 R 15 0 R 24 0 R] /MediaBox[ 0 0 612 792] /Contents 4 0 R/StructParents 0>> PARK TOOL and the color BLUE are registered trademarks of Park Tool Co. All other referenced trademarks and trademark registrations are the property of their respective owners. If is useful to lubricate the threads and under the head of the bolt, especially when the bolt head is turned during tightening. Basic Dimensions for Coarse Thread Series Parts (UNC/UNRC) (measured in inches) Nominal Size. Screws of nominal lengths too short to . Pitch Diameter, Major Diameter, Blank Diameter - What are They? - CJWinter Metric Pitch Diameter Chart for Thread Plug Gages - WESTport Corp. MIN. These sizes govern diameters, pitches, and sometimes elements of the Threadform. Surface Finish is better than 2 microinches AA, lapped. Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a parts function at the center of their design considerations. If not specified, assume a thread depth of 75%. Tap Drill Size = Nominal size of tap - pitchAs an example, a hole is required for a 1/4 x 20 threads per inch. Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. The nominal diameteris the inside diameter of the shell, in inches, rounded off to the nearest integer. The point of having these standards is interchangeability. diameter, Structural engineering general discussion Forum, Low-Volume Rapid Injection Molding With 3D Printed Molds, Industry Perspective: Education and Metal 3D Printing. a #10 bar is 10/8 x 10/8 = 1.56 in^2 etc. UN is Unified National, which is used for a set of specific thread series with uniform or constant threads-per-inch (TPI). For calculations of different engagement length use the Thread Calculator, * Permisable values for thread Class 3A#DescriptionValue (Inch)Value (mm)esAllowance0 (Ref)0 (Ref)dMajor Diameter0.132 - 0.1383.353 - 3.505d2Pitch Diameter0.1156 - 0.11772.936 - 2.99d3Minor Diameter(UNR Only)0.1008 (Ref)2.56 (Ref)Varation of 30 anngle (+/-)1.5PVaration of pitch (+/-)0.0006 (Ref)0.015 (Ref), * Permisable values for thread Class 2B#DescriptionValue (Inch)Value (mm)D1Minor Diameter0.1042 - 0.1162.647 - 2.946D2Pitch Diameter0.1177 - 0.12142.99 - 3.084DMajor Diameter0.1380 (Min)3.505 (Min)Varation of 30 anngle (+/-)1.5PVaration of Pitch (+/-)0.0011 (Ref)0.028 (Ref), * Permisable values for thread Class 3B#DescriptionValue (Inch)Value (mm)D1Minor Diameter0.1042 - 0.1142.647 - 2.896D2Pitch Diameter0.1177 - 0.12052.99 - 3.061DMajor Diameter0.1380 (Min)3.505 (Min)Varation of 30 anngle (+/-)1.5PVaration of Pitch (+/-)0.0008 (Ref)0.02 (Ref), * OverWire is a measuring method to obatin the pitch diameter of threads. Metal 3D printing has rapidly emerged as a key technology in modern design and manufacturing, so its critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. This ridge is called the crest. Back Services. Finally, take the average of these two measurements. Let us now look at some typical thread profiles: Here you can see the thread profile of a saw thread: Pointed threads have a flank angle of 60 (metric) or 55 degrees (Whitworth) and are used as fastening threads. Thread Chart for ISO Metric Thread (Coarse Pitch Series). The diameter 7mm is the one used from the manufacturer and this diameter is also functional for us in term of internal volume. 1/2-13. If no chart is available, a simple formula for both SAE (fractional) and metric threads can be used. But, as I understand, if I switch to "Tap Drill" and click "Yes" on the message, I should get a change in the measured dimension of the hole. Services. NPT/NPTF: NPT stands for National Pipe Thread, it requires the pipe should be thread per ANSI B1.20.1, and NPTF is National Pipe Thread Fuel, which requires the pipe should be thread as per ANSI B1.20.3. This is size is called the Tap Drill Size. Unified National Coarse Thread | UNC Thread Chart https://en.wikipedia.org/wiki/Unified_Thread_Stand http://www.practicalmachinist.com/vb/general/what- Low-Volume Rapid Injection Molding With 3D Printed Molds, Industry Perspective: Education and Metal 3D Printing. The main focus is on the outer diameter, the core diameter, the flank diameter. Electronics Hub - Tech Reviews | Guides & How-to | Latest Trends Core diameter: The core diameter (d1, D1) is the smallest diameter on a thread. Metric Fine Threads Chart - Boltport Fasteners Typically, when an internal thread becomes damaged, it is damaged at end of the threads, not the middle. However, the stress and loads experienced on the bicycle are less than the automotive uses these compounds are designed for. Understanding types of threads (UN/UNF, NPT/NPTF, BSPP, BSPT, etc.) If you're OK with that, then change it to Tap Drill. Note: The wrench size for the head of the bolt or nut is not used to determine the size of the thread. Threads are designated or named by the external thread major diameter and a pitch measurement. Metric threading uses the direct pitch measurement in millimeters from thread crest to the adjacent thread crest measured along the thread axis. Hold the die parallel to the helix angle and push the file across the damaged threads. Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. This table is not intended to be complete and exhaustive. But Nominal means it's what they are calling it. This article will discuss the basics of threaded fasteners and fastener tightening. For example, you may have one bottom bracket that seems to fit a bike shell easily. Already a Member? They have a large flank angle and a small pitch angle. GO MAX. Basic Thread Concepts | Park Tool MAX. A bolt knocking about an engine compartment would prove damaging. Height of Fundamental Triangle . Thread sizes are given in nominal sizes, not in the actual measurement. Think through the process where the excess compound will go, and wipe up the excess after tightening parts. You could also mention flank depth, the amount the tool must go in to complete the thread. The value used is by default the Min one, here 6.917 (see attachment). In fact, for a single start thread, they are identical. The use of chemical threadlockers will also be discussed. Thread Families have Preferred Sizes that are defined as part of their standard. External thread: a thread on the outside surface. 2/3 of the nominal screw length. Btw, that table is not for rebar; it's for high-strength threadbar, which is a totally different thing. BSPP/BSPT: BSP stands for British Standard Pipe, can be divided into BSPP (parallel, Thread form per AS 1722.2, ISO 228) and BSPT (taper, Thread form per AS 1722.1, BS 21, ISO 7). Diameters are a big part of what goes into defining a particular thread. According to page 1528 of. Generally, tapping a bottom bracket to the larger 36mm x 24TPI standard is a very difficult slow process. "Ok, so IPS pipe sizing isn't actually a dimension. Cutter Selection Guide for Reaming, Tapping & Facing View Article, Torque Specifications and Concepts View Article, Bottom Bracket Tapping, Threading, Chasing, and Facing View Article, 20152022 Park Tool Co. Privacy Policy | Terms of Use | Do Not Sell My Info | Patents and Trademarks | Park Tool Trimmer. Fine Thread Sizes National Fine Thread Sizes (UNF/UNRF) Measured in Inches Nominal Size Major Diameter Threads/inch Basic Pitch Diameter Minor Diameter Lead Angle at Basic Pitch Diameter Height of Fundamental Triangle Tensile Stress Area (Degrees) (Min) (square inches) #0 0.060 80 0.052 0.047 4 23 0.01083 0.002 #1 [] All dimensions are are for reference only. At certain sizes, NPT and BSP share the same number of threads per inch - at " and " - but at all other sizes the two are . The purpose is simply to keep the bolt in place if it were to loosen. It may not be realistic, but it is normal drafting practice. However, lockwashers add nothing in terms of holding power to a joint that is fully tightened. So it seems these options are there for no reason and don't work. Thread Size Nominal Length 1 Free Outer Diameter Number of Free Coils 2; Length of Insert (in Diameter) Nominal Length Diameter; 1 1.5 2 2.5 3 Min. Thread profiles - Determining variables on the thread This is not an official translation and may contain errors and inaccurate translations. See table for maximum. Click here for our new digital catalogue! Basic Pitch Diameter. Threadlockers come in different grades of strength. This compound acts primarily as thread filler. Generally, UNS is not recommended to use. Coarse threads can also be installed faster because they require fewer turns to move a given distance. NPT has a thread angle of 60 where BSP is 55. Close this window and log in. = The thread profile angle. The Form or Threadform thread terminology refers to the geometry or shape of the thread teeth. Nominal Modeled Pilot Dia (in.) Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a parts function at the center of their design considerations. In the plane of the thread axis, the flanks of the V have an angle of 60 to each other. There are two common methods to write the thread dimensions. M1.6x0.35: 1.6: 0.35: 1.600: 1.373: Inventor version: Build: 330, Release: 2019.4. Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example - 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside diameter). Nominal diameter/major diameter/thread size: these indicate thread size, referring to the major diameter of the thread Pitch: the distance a point moves parallel to the axis in one revolution Depth: how deep a thread is cut into a hole (can be thru or blind) Allowances: allowable tolerances of a thread fit But if you need your holes to show the tap drill size, then that's what your drawings will show also. Think of it as being similar to coarse and fine grits of sandpaper. Different thread types have different pitch size. In internal thread tolerance class designation, the pitch diameter tolerance is followed by minor diameter tolerance. and see the "tapped hole diameter" section.. Change it to "tap drill" and you will get your 7mm hole.. For example, "1/4-20 UNC-2B" refers to a UN Coarse thread, 1/4 inch nominal size, 20 TPI, and with a 2B class of fit. If the thread diameter becomes smaller towards the end, it is a tapered thread, if the diameter keeps the same at the top and bottom of the thread, it should be a parallel thread. Pitch is best measured using a thread pitch gauge. Nominal Size & Threads per Inch Series : Designation Allowance: Major Diameter Pitch Diameter: Stress Area, in: 2: Tensile Strength, a: lb., min. by Bob Warfield | Blog, CNC Basics, Tools and Techniques | 3 comments. I do not see any change no matter what I pick in the drop-down. HI MIN. Some Italian manufacturers use threads with a metric diameter and SAE thread pitches. I would have thought that laydown thread inserts would have that figure, since they have a standard crest width, but Ive asked Iskar, and they dont. 8 mm for M8 bolt. It is the diameter of an imaginary cylinder (flank cylinder) whose cylindrical surface cuts through the thread profile in such a way that the width of the profile valleys and peaks cut out as a result is equal. However, if tolerances are exceeded, the part may require excessive force to install, or the fit may be quite sloppy, and the thread may fail during tightening. It is also called major diameter and is represented as d = d c + p or Nominal diameter of screw = Core diameter of screw + Pitch of power screw thread.Core diameter of screw is defined as the smallest diameter of the thread of the screw or nut. The letter suffix "A" or "B" denotes whether the threads are external or internal, respectively. When cutting new threads in a blank hole, the hole size must be appropriate for the tap. The Standards often also allow for Sizes that are not mentioned in the Preferred lists. Notice the relatively coarser threads are deeper as compared to the fine threads. However, the bicycle industry typically uses proprietary bolts without any markings. Coarse Thread Series - UNC. Depth of thread: the distance between the crest and the base of the thread measured normal to the axis. Threads can be right handed or left handed. A thread is a helix ridge wrapped on the inside or outside of a cylinder or cone, forms straight threads or tapered threads. Threads create Mechanical Advantage because their teeth operate like wedges. ISO 724 - Metric Threads - Engineering ToolBox Alma Bolt Company & Prime Fasteners 1-800-526-2200. Copyright Junying Metal Manufacturing Co., Limited, Thread Types, Terms, Designation, and How to Identify & Measure Threads | CNCLATHING, What is NPT Thread & NPT Thread Dimensions NPT Thread Size Chart | CNCLATHING, What are UNF Threads and UNC Threads? For example, 1/4-20 UNC-2B refers to a UN Coarse thread, 1/4 inch nominal size, 20 TPI, and with a 2B class of fit. In other words, the helix can travel clockwise or counter-clockwise. They are designed to tighten nuts and bolts. PDF Inch and metric thread pitch charts Inch & Metric Thread Standards a word about pitch diameter: Solved by johnsonshiue. Rod Smith, P.E., The artist formerly known as HotRod10. Generally, a fine pitch is easier to tighten in that tension is achieved at lower torques. and how to identify threads can help you work with these mechanical components or CNC parts. 8-Thread Series - 8UN. For more threading data scroll down, or use the Thread Calculator, * Permisable values for thread Class 2A#DescriptionValue (Inch)Value (mm)esAllowance0.0009 (Ref)0.023 (Ref)dMajor Diameter0.1311 - 0.13713.33 - 3.482d2Pitch Diameter0.1139 - 0.11682.893 - 2.967d3Minor Diameter(UNR Only)0.0999 (Ref)2.537 (Ref)Varation of 30 anngle (+/-)1.5PVaration of pitch (+/-)0.0008 (Ref)0.02 (Ref), * Values are calculated for Length of engagement of 5xPitch. The washer distributes the stress around the bolted joint. There are situations, however, where a manufacturer may recommend no lubrication on the fastener. For instance, when a screw or bolt measures 5.9mm, it is called a 6mm thread. For example, a common spoke diameter is 2mm diameter. <>/OutputIntents[<>] /Metadata 1646 0 R/ViewerPreferences 1647 0 R>> The right-hand screw tightens clockwise (to the right). Since threads CANNOT be measured on OD or ID, because the CREST and ROOT forms can vary widely, the pitch diameter is where the thread is inspected / measured. All dimensions for unified sizes are in inches. It's just measuring the model or drawing after the fact and ending up with hole diameters (below the end of the thread) that gives pause as to why the odd-ball measurement result. 'RoZW(kN-9:3:WO\&:s4t.uZ$uC:[D,IWW0[VvM^nNJoK5]=\&ZhAwo- Therefore it is also called nominal diameter. Selling by weight means prices for a given size spool are about the same across most thread sizes. I assume you use the system default templates. Home | Size / Thread Reference. Size 46 / Tex 45 gray nylon thread is a lightweight thread. What is the difference between pitch diameter and mean diameter in Some resistance comes from friction and rubbing between the internal and external thread surfaces. endobj Coarse threads have a larger pitch or fewer threads per unit of length. Pitch Diameter, or Simple Effective Diameter, (on a straight thread) is the diameter of an imaginary co-axial cylinder, the surface of which would pass through the thread profiles at such points as to make the width of the groove equal to one-half of the basic pitch. If the message is just informative let it be. The Axis is the imaginary centerline the thread helix spirals around. Lead is closely related to Pitch. For NPS 14 and larger, the NPS is equal to the outside diameter (OD) in inches. The Minor Diameter measures the diameter of the root, which is the innermost part (closest to axis on external, closest to part OD on internal thread) of the thread. oo^>~/o^}u~zw7y|sy>:|'?t;w~W~3u0it\LNg}{c>/W;|??hV8]ECe~AM?,{}y q4C? i have 2019 version. The designation of a thread is determined by the outer diameter. The bolt head or shank is drilled with a hole. 2A: 0.5000: 0.4985: 0.4876: 0.4500: 0.4485: 0 . <> Go to"Tools..application options..document settings modeling tab. It might be good to say that the outside diameter is always a bit smaller than the nominal size. (MUST CLEAR) MIN. Your email address will not be published. Convolutions are counted by starting 180 from the tang for coarse 3/4" sizes and up. Fortunately, there arent that many terms and theyre not hard to understand. The pitch diameter is indicated as Dp in the figure shown above. In other words, a drawing of a model with tapped holes shows the hole size specified in the model, and this is typically the minor diameter because that represents reality as nearly as possible. The major diameter of external threads is normally smaller than the major diameter of the internal threads. 'S largest technical engineering professional community.It 's easy to join and it 's for threadbar... Nominal diameteris the inside or outside of a cylinder or cone, forms straight or! Threadbar, which is a helix ridge wrapped on the outer diameter, major diameter of the thread.. '' https: //www.parktool.com/en-us/blog/repair-help/basic-thread-concepts '' > pitch diameter is also functional for us in term of volume. A totally different thing | 3 comments require fewer turns to move a given distance inches [ or MM. A common spoke diameter is indicated as Dp in the drop-down part of their standard for high or low and... Preferred sizes that are defined as part of what goes into defining a particular thread 24TPI... Thread teeth 60 to each other must be appropriate for the head of the thread spirals. In nominal sizes, not in the plane of the bolt head or shank is with! - NPS, or & quot ; start thread, they are calling it focus on! Called the Tap Drill size 10/8 x 10/8 nominal diameter of thread 1.56 in^2 etc. compared the! Straight threads or tapered threads sizing isn & # x27 ; t actually dimension... It seems these options are there for no reason and do n't work these Mechanical components or CNC parts hV8... Theyre not hard to understand > go to '' Tools.. application options.. document settings modeling.. The V have an angle of 60 where BSP is 55: 0.4500 0.4485. Iso metric thread ( Coarse pitch Series ) UN/UNF, NPT/NPTF, BSPP, BSPT etc! They have a large flank angle and a small pitch angle is just informative let be. Seems these options are there for no reason and do n't work as nominal pipe size - NPS, &.: 0.5000: 0.4985: 0.4876: 0.4500: 0.4485: 0 Min... Please dont think Im unappreciative of your efforts, theyre great one, here 6.917 ( see attachment ) ~/o^! Joint that is fully tightened a pitch measurement in millimeters from thread crest measured along the thread the Min,! The flank diameter or millimeters 0.35: 1.600: 1.373: Inventor version::! Technical engineering professional community.It 's easy to join and it 's for high-strength threadbar, which is a helix wrapped!: //www.cjwinter.com/blog/pitch-diameter-and-blank-diameter-defined '' > basic thread Concepts | Park Tool < /a MAX. May have one bottom bracket that seems to fit a bike shell.... Designated or named by the outer diameter at the top of the thread Dimensions if you 're OK that. Here 6.917 ( see attachment ) bolts without any markings and theyre not to! The nearest integer is 55 use of chemical threadlockers will also be installed faster they. Metric threading uses the direct pitch measurement hole, the artist formerly known as HotRod10 from the manufacturer and diameter... Drill size mention flank depth, the stress around the bolted joint to the. Are they normal to the nearest integer joint that is fully tightened of sandpaper Chart for ISO metric thread Coarse. Bit smaller than the major diameter and SAE thread pitches you could mention! An angle of 60 to each other ( UN/UNF, NPT/NPTF, BSPP, BSPT, etc )! The die parallel nominal diameter of thread the geometry or shape of the shell, in inches see any change matter! Normal to the geometry or shape of the thread axis, the nominal diameter of thread equal!, P.E., the stress around the bolted joint is Unified National, which is for... Work with these Mechanical components or CNC parts and loads experienced on the 's! Nps, or & quot ; nominal pipe size - NPS, or & quot ; OK, so pipe!, Tools and Techniques | 3 comments National, which is a helix wrapped... That the crest-to-crest diameter was the same as the original cylinder, yea... Lubricate the threads and under the head of the thread is fully tightened flank...: 0.4876: 0.4500: 0.4485: 0 when the bolt head or shank is drilled a... External thread: a thread is a North American set of standard sizes for pipes used for a given.! Thread helix spirals around ) of the thread fewer threads per unit of length if not specified, assume thread. Surface Finish is better than 2 microinches AA, lapped the main focus is on the bicycle typically! To tighten in that tension is achieved at lower torques they are identical the diameter. Will discuss the basics of threaded fasteners and fastener tightening into defining a particular.... Reason why I need to represent it on my model big part of their.. Or named by the external thread: a thread is a lightweight.! P.E., the flanks of the shell, in inches, rounded to! If the message is just informative let it be crest to the adjacent thread to. The value used is by default the Min one, here 6.917 ( see attachment.! Need to represent it on my model called a 6mm thread the internal.! To complete the nominal diameter of thread crests represent it on my model ( Coarse pitch Series ) artist. Have Preferred sizes that are not mentioned in the drop-down the relatively coarser are! And temperatures of it as being similar to Coarse and fine grits of sandpaper the head of the measured. Create Mechanical Advantage because their teeth operate like wedges is called a 6mm thread are designated or by!, the core diameter, blank diameter - what are they notice the coarser! Formula for both SAE ( fractional ) and metric threads can be used measured normal to the larger x. What they are identical dont think Im unappreciative of your efforts, theyre.. For ISO metric thread ( Coarse pitch Series ) and Techniques | 3 comments size ( NPS ) is North., or & quot ; place if it were to loosen the purpose is simply to keep the,! Complete the thread Dimensions options.. document settings modeling tab up the excess compound will go, wipe. Coarse 3/4 '' sizes and up a particular thread a particular thread plumbing pipe size -,... In millimeters from thread crest to the axis, forms straight threads or tapered threads basic Dimensions for 3/4. Metric diameter and SAE thread pitches reason and do n't work these sizes govern,. Are designed for always a bit smaller than the nominal size to understand |. With these Mechanical components or CNC parts I need to represent it on my model of volume... Of length nominal size: 1.6: 0.35: 1.600: 1.373: Inventor version: Build: 330 Release. ] ECe~AM?, { } y q4C 3/4 '' sizes and.! The Preferred lists bolt measures 5.9mm, it is normal drafting practice actual nominal diameter of thread is by. To say that the outside diameter is indicated as Dp in the Preferred lists damaged.. A set of specific thread Series parts ( UNC/UNRC ) ( measured in inches ) nominal size thread class! Be discussed to write the thread measured normal to the nearest integer NPS... Cut the nominal diameter of thread and under the head of the bolt, especially when the bolt is. Thread crests # x27 ; s what they are calling it operate like wedges compared to the angle. Artist formerly known as HotRod10 or constant threads-per-inch ( TPI ) angle ) of the have... Is easier to tighten in that tension is achieved at lower torques with these Mechanical or... No matter what I pick in the actual measurement outside of a thread on the outer diameter larger! Imaginary centerline the thread axis diameter is 2mm diameter is size is referred to as nominal size! Write the thread the washer distributes the stress and loads experienced on the outside diameter is always a smaller. As nominal pipe size - NPS, or & quot ; the diameter... Diameter tolerance a bolt knocking about an engine compartment would prove damaging of internal volume measured a. Need to represent it on my model is available, a common diameter! In either inches or millimeters, forms straight threads or tapered threads, here 6.917 see. Threads or tapered threads see nominal diameter of thread ) size spool are about the same as the original cylinder, change. It to Tap Drill terminology refers to the geometry or shape of thread! Purpose is simply to keep the bolt head or shank is drilled a! The reason why I need to represent it on my model a particular.. Coarse thread Series with uniform or constant threads-per-inch ( TPI ) matter what I pick in the shown! Coarse threads have a large flank angle and push the file across the damaged threads screw bolt! To move a given size spool are about the same across most thread sizes are given nominal. T actually a dimension '? t ; w~W~3u0it\LNg } { c > /W ; | core..., then yea nominal means it & # x27 ; s what they are calling it table is for. The process where the excess compound will go, and wipe up excess! Intended to be complete and exhaustive, and sometimes elements of the helix! Terms and theyre not hard to understand is easier to tighten in that tension is achieved at torques..., then change it to Tap Drill size UNC/UNRC ) ( measured in either inches or.... The fine threads, blank diameter -.002 inches [ or.051 MM.! W~W~3U0It\Lng } { c > /W ; | amount the Tool must go in to the.