Tap hole callout - 6H is the preferred tolerance class at Husky. Class 6H8G is only permissible on tool and alloy steels. Chamfer Ø = Tap drill Ø + (N x pitch) With Nnom=1.5, Nmin=1.3, Nmax=1.7 Given values apply to cut tap 6H holes. All dimensions in mm. ISO261 & ISO965 metric screw threads. ISO metric screw threads are designated M10 X 1.0-6H.

 
Helicoil from McMaster-Carr 18-8 Stainless Steel Helical Inserts 91732A201 calls out a specific tap to use, but I cannot find out what thread this tap is putting into the hole for the insert. I want to call out the tapped thread on a drawing, and put the 2-56 insert in later. I cannot find what the thread should be.. 58 bus

A blind hole requires the tap to pull the chip out of the hole, meaning it is a spiral fluted tap. The most expensive tap and probably the weakest. There are three different chamfer lengths available in taps bottom, plug, and taper/hand. Bottom has 1-2 thread pitch chamfer, plug 3-5 tpc, and taper/hand has 7-10 tpc.Tapping: After drilling the hole, a tap is inserted and rotated to cut threads into the hole’s walls. Taps are cutting tools with helical flutes, and they come in various styles, including hand taps, machine taps, spiral-point taps, and spiral-flute taps. ... making it essential to call out the correct material for the threaded hole. 6.Thread ... To define a derived hole callout standard: Locate and open calloutformat.txt. Copy and paste content describing the ANSI standard. Using only upper case letters, substitute the new derived standard name for ANSI in this copied section of text in the file. Modifying the Hole Callout Format. Could you dig a hole all the way to the Earth’s mantle? Find out how hard it is to dig a hole through the Earth and what you might find. Advertisement If your family took you on a ...1 Insert Installation 1. Drill with a standard drill, as listed for each part number. 2. Countersink with a standard countersink (82° to 100°). 3. Tap with a standard Unified Thread Series tap. 4. Screw in insert with fingers or installation tool. Insert is …How I can set the hole callout (tap hole only) to show. I need to remove the 1st line. I need the depth to be 2d.p. only. Original version from attachment, I want the update to be the following. e.g. M3x0.5-6H, depth symbol 0.75. I want to make this automatically for all tap holes when I create them. I have thousands of holes to do. Tap Drill Clearance Drill Aluminum, Brass, Plastics Steel, Stainless Steel, Iron Close Fit Standard Fit 75% Thread 50% Thread Screw Size Major Dia (mm) mm per Thread Drill Size Closest Imperial Drill Size Closest Imperial Drill Size October 17, 2017. Steven Weinberg. An engineering drawing should specify exactly enough information to produce the desired part, and no more. A tap drill is used to form the initial hole before a tap forms the threads. …To identify a snake hole, look for openings in the ground that are newly visible. Snakes don’t construct a dwelling, they inhabit an abandoned rodent’s burrow or a naturally-occurr...Feb 29, 2008 · Drill and Tap; and calloutformat.txt (Part 1) This entry is part 1 of 4 in the series Hole Callouts. Sooner or later, the topic of how to callout a threaded hole comes up in pretty much everyone’s career in the Mechanical Engineering field. I’ve seen the nature of those discussions be straight forward, but I’ve also seen angst riddled ... Tapped holes can be made with a traditional tap which is a tool made for a standard thread size, or a thread cutter, which is a small disk that cuts threads through the XYZ movement of the CNC. The thread cutter is limited to diameters greater than 1/2″. Custom threads can be made with a thread cutter, but this may result in a additional charge.Mar 26, 2011 · If you are going to tap a 4.8mm hole with M6, then you are going break the tap for sure. Make a print out for metric threads and tape it to your shops wall. Simple. But one thing you are correct juergenwt, on drawings metric threads don't have a thread pitch described, unless, its a fine pitch thread. TDegenhart , here is a simple chart for you. Hole Callouts. The Hole Callout tool adds driven diameter dimensions to holes created by the Hole Wizard or circular cut features.. Hole callouts are available in drawings. If you change a hole dimension in the model, the callout updates automatically. Hole callouts use Hole Wizard information when you create a hole with the Hole Wizard.Now you can create associative callsouts for holes and threads based on the hole's feature data with the new Hole Callout option in NX 9 linear and radial dimensioning. You can apply hole callouts to many things: The Hole Table command creates ordinate style hole locations arranged in a table. The table can contain individual columns for labels ...Calloutformat.txt is the default file which SolidWorks uses to determine how to form threaded hole callouts created with the Hole Wizard. This file establishes the rules to show both the nominal drill diameter and the thread detail in a leadered note. This is the most common method for threaded hole callouts. hole callouts in drawings. SW By Sarah Wells 10/08/13. When I use the Hole Wizard to create a tapped hole and then bring the model into the fabrication drawing. In the drawing you can choose to use the hole callout annotation command and it works perfectly with the countersunk and counter bored holes but it doesn't read the tapped hole. Select Count holes to preface the callout with the number of holes that exactly match the hole you are dimensioning.; If you selected Traditional as the callout type, click Description to append a description of the hole to the callout.; To add Ø before the DRILL and CBORE dimensions in the callout, click Add Ø.; To change layer preferences, click Change.Creating a hole or thread callout: Click . Select a circle that is part of a hole feature, or a thread that is part of an external thread feature. Drag to place the callout. If the selection was part of a hole feature, the precision, tolerance, fit class tolerance, and shaft class tolerance values from that feature are automatically applied.Apply a hole callout to a hole or thread, automatically inserting the metadata of the hole or thread. Steps Copy link. Creating a hole or thread callout: Click . Select a circle that is part of a hole feature, … If no match is found, the hole note format will be set by the general CALLOUT_FORMAT field in the hole chart file. If this field is empty, the system default will be used. The columns HOLE_TYPE, THREAD, DRILLED_DEPTH, THREAD_DEPTH, CSINK, CBORE, EXIT_CSINK, and STRAIGHT_DRILLED_DEPTH (in tapered holes) are used for defining the typical combination. Tap Drill Sizes Charts; GLOSSARY; LEARNING Menu Toggle. G-Codes Menu Toggle. G00 – Rapid traverse; G01 – Straight Line Feed; ... Tolerance Deviaiton H (for Holes) The posision of H relative to the other hole deviations. Size limits for Hole Tolerance Classes H1 - H18. Basic Size in ...US Wood Screws - Pilot Holes Hard wood and soft wood pilot holes, shank clearance holes and countersink diameters. Withworth Threads - Taps and Drill Sizes Taps and drill sizes used for Whitworth - ISO 7 and ISO 228 threads. Wood Screws - Withdrawal Force Allowable withdrawal load force.In the image above, the three holes on the left are all blind holes. The hole on the right is a thru hole. Blind hole symbol. Diameter symbol. Depth of symbol. There is no GD&T symbol for a blind hole. A …used in local callouts for holes. Standard practice recommends specifying the holes as 2 X .250 with the leader line only pointing to one hole. The depth symbol is used in front of the depth value. If the depth is specified as THRU (for through), the hole passes entirely through the feature. Also illustratedNov 24, 2020 ... Drawing tapped holes - metric threads. 810 views · 3 years ago ...more. MVCC AET Automation & Engineering Technology. 1.52K.Tip/Trick. Here’s the tip to use simplified threaded hole callouts. Before SolidWorks is started, launch Windows Explorer and goto X:\Program files\SOLIDWORKS Corp\SOLIDWORKS\lang\english (or similar, depending on SOLIDWORKS installation location). Rename calloutformat.txt to calloutformat_1.txt. Rename calloutformat_2.txt to calloutformat.txt.Relation Of Tap Pitch Diameter to Basic Pitch Diameter American Tap Manufacturers use a series of tap pitch diameter limits. These limits feature a .0005 tolerance in tap sizes #0 Thru 1" and a .001" or greater tolerance in tap sizes above 1" thru 1 1/2" diameter. ... Since the tap is used only in tapping a hole or producing an internal thread ...A faucet from the Delta Faucet company is more than just another tap or shower fixture. From the bottom up, the company is known for making water fixtures that stand out for their ...If you’re planning a trip to Jackson, Wyoming, then having a detailed area map is essential for making the most of your visit. When exploring a new destination like Jackson Hole, i...The dashed lines shown on the cross-section of the part indicate where the depth measurement is taken. Figure 1: Depth of Feature Indicated by the Depth Symbol. If the depth dimension isn’t clear because of a curved or complex surface, the part should be dimensioned pictorially, without the depth symbol. The part in Figure 2 is a good …You add hole callouts to annotate the Toolbox holes in your drawing with dimensions and descriptions. You can create a hole table by selecting holes with callouts. The table lists the locations and descriptions of the selected holes. The format and content of hole callouts depends on: Hole category. Counterbore. Countersink. Thru Hole. TapThe Hole Callout tool adds driven diameter dimensions to holes created by the Hole Wizard or circular cut features. Best results are obtained by creating holes using the Hole Wizard. Hole callouts are available in drawings. If you change a hole dimension in the model, the callout updates automatically. Hole callouts use Hole Wizard information ...... Dimensioning,Ordinate Dimensioning,Bolt Holes Dimensioning,Hole Callouts,Threaded Hole Callout,General Dimensioning and Tolerancing,GD&T,ISO,ANSI,CobanProduction of bottoming tapped holes can be done with a bottoming tap tool. These taps have only 1 to 1 ½ chamfered threads. But bottoming taps never used to cut thread in an unthreaded hole as its got only few chamfered cutting edges at the tip. So need use taper tap (8 to 10 tapered threads) and intermediate tap (3 to 4 tapered threads ...Choose the Best Hole Size to Start. Let’s get ahead of the game right from the start by choosing the right hole size. It may surprise you to learn that the size recommended on the tap’s packaging or in the typical charts is usually NOT the best size to use!. Full details here, but in general, you want to select a hole size that matches a good …6H is the preferred tolerance class at Husky. Class 6H8G is only permissible on tool and alloy steels. Chamfer Ø = Tap drill Ø + (N x pitch) With Nnom=1.5, Nmin=1.3, Nmax=1.7 Given values apply to cut tap 6H holes. All dimensions in mm. ISO261 & ISO965 metric screw threads. ISO metric screw threads are designated M10 X 1.0-6H.Find out how to repair damaged vinyl siding on your home, from small holes to large cracks. Expert Advice On Improving Your Home Videos Latest View All Guides Latest View All Radio...If you’re working on a project that involves drilling and tapping holes, understanding drill and tap sizes is crucial. The right drill and tap size ensures proper thread engagement...ACME Threads: Dimensions, Charts & Formulas. Acme is a trapezoidal thread profile with a 29° V angle, defined in ASTM B1.5. It is the most popular thread used for traversing linear motion (For example, leadscrews and power screws) due to its ability to withstand large loads and ease of manufacturing. It is found in industrial equipment such as ...Proper way to call out NPT thread. New to the use of NPT. The key problem is the taper which introduces a question in the context of the design: Threaded hole goes directly into an aluminum enclosure that has numerous parts installed, and a flat gasket at the parting line of the enclosure. The threaded holes provide the interface to run Helium ...Adding Hole Callouts in a Drawing. Click Hole Callout (Annotation toolbar), or click Insert > Annotations > Hole Callout. The pointer changes to . Click the edge of a hole, then click in the graphics area to place the hole callout. A Hole Callout is inserted and the Dimension PropertyManager appears. The callout contains a diameter symbol and ...With this Section View A-A activated, we can directly drop a hole callout parallel to the hole axis using the Size Dimension command. Figure 9. Direct hole callout parallel to axis when a Section Annotation View is activated. Now, comparing Figure 1 and Figure 6, you may notice that we still have some work to do. For example, the text ...Tap Drill Chart. The most common way to produce an internal female thread is to drill a hole smaller than the major diameter and then use a tap to produce the thread. This is usually referred to as a tapping drill for the size of the thread that needs to be produced. A good way to decide on what diameter drill to choose is to use a tap drill ...However, SOLIDWORKS interprets this as the user’s design intent to make the hole through every feature, so the drawing’s hole callout is “THRU ALL” even though there is only one feature being drilled through. To capture design intent of “THRU”, the end condition of the hole must be “Up to Next”. This tells SOLIDWORKS the design ...Your job on the drawing is to define what you want. The machinist's job is to make the part to your design. By only calling out the NPT thread on the hole, you have done your part. How deep the machinist taps the hole to get the proper fit, is his job. "Wildfires are dangerous, hard to control, and economically catastrophic."How I can set the hole callout (tap hole only) to show. I need to remove the 1st line. I need the depth to be 2d.p. only. Original version from attachment, I want the update to be the following. e.g. M3x0.5-6H, depth symbol 0.75. I want to make this automatically for all tap holes when I create them. I have thousands of holes to do.If you specify a .250 diameter hole at .500 deep then the hole should be .250 for the entire length of .500. If the tip is included in this then this will not be the case. Adding the DO NOT BREAK THRU note is effective as well. The same goes for tapped holes. The depth should be for the minimum amount of threads.US Wood Screws - Pilot Holes Hard wood and soft wood pilot holes, shank clearance holes and countersink diameters. Withworth Threads - Taps and Drill Sizes Taps and drill sizes used for Whitworth - ISO 7 and ISO 228 threads. Wood Screws - Withdrawal Force Allowable withdrawal load force.Tap Drill Clearance Drill Aluminum, Brass, Plastics Steel, Stainless Steel, Iron Close Fit Standard Fit 75% Thread 50% Thread Screw Size Major Dia (mm) mm per Thread Drill Size Closest Imperial Drill Size Closest Imperial Drill SizeFormerly Western Tap at 2044 N. Western Ave., the watering hole closed over the summer when its 87-year-old Polish barkeep — known only by her first name of Irene — broke her hip and went ...A regulation cribbage board has 120 holes. The holes are laid out in four rows of 30 holes each. The holes are marked off in groups of five, and each player gets two rows. Traditio...The GD&T callout for a counterbore is shown below. The counterbore symbol will often be used together with the diameter symbol and the depth symbol. Older blueprints may specify a counterbore with the notation CBORE instead of the counterbore symbol. Counterbore symbol. If you want to type the ⌴ symbol, hold the ALT key and press 9012.Drywall holes are easy to fix, even without a drywall repair kit. Learn how to fix both small and large holes in drywall. Advertisement Tough as it is, drywall can withstand only l...Dec 11, 2021 · The first part represents the quantity of the hole. Which is 3 in the case of inch thread and 2 in the case of metric thread from the above tap hole callouts. The second part is the tap hole screw thread designation. (Discussed seperately for each unit system below) The third part is the Bolt Circle Diameter where the hole need to be placed. Tap Drill Clearance Drill Aluminum, Brass, Plastics Steel, Stainless Steel, Iron Close Fit Standard Fit 75% Thread 50% Thread Screw Size Major Dia (mm) mm per Thread Drill Size Closest Imperial Drill Size Closest Imperial Drill SizePermanently remove "tap drill" size during thread callout as default. I switched from inventor to solidworks not too long ago, and I find this annoying and confusing. When the machinist taps the hole, they will do it according to machinery handbook. This is just taking space and I want a permanent way to eliminate the drill tap …The answer is actually quite simple. Pipe threads are sized differently than standard straight thread. They are based on the basic size at the top of the threaded hole that has been produced by the pipe tap. The Basic size occurs approximately 12 threads from the front of the taper pipe tap. This is commonly called the 12-thread count.American Tap Manufacturers use a series of tap pitch diameter limits. These limits feature a .0005 tolerance in tap sizes #0 Thru 1" and a .001" or greater tolerance in tap sizes above 1" thru 1 1/2" diameter. Example: 1/4-20. Relationship between Tap Pitch diameter limits and basic nominal pitch diameter.You add hole callouts to annotate the Mechanical Toolbox holes in your drawing with dimensions and descriptions. You can create a hole table by selecting holes with callouts. The table lists the locations and descriptions of the selected holes. The format and content of hole callouts depends on: Hole category. Counterbore. Countersink.Shop Parallel Keys - Tapped and Counterbored Holes from MISUMI. MISUMI USA has all of your Machine Keys needs covered, with over 3.8M high quality products ...Wherever possible or reasonable use a through drilled hole and give a minimum thread length callout. A blind hole requires the tap to pull the chip out of the hole, meaning it is a spiral fluted tap. The most expensive tap and probably the weakest. There are three different chamfer lengths available in taps bottom, plug, and taper/hand.In removing very small amounts of material, a tap may simply burnish and not cut. In order to minimize this. problem, Heli-Coil Oversize Taps have been made to a slightly larger pitch diameter than if they were cutting an untapped hole. As a result, a Class 3B hole may not be attainable.Aug 13, 2022 ... Simple Through Hole 01:30 Threaded / Tapped Hole 03:08 Counterbore Hole 04:28 Threaded / Tapped Counterbore Hole 04:56 Countersink Hole 06 ...CL HOLE CLOSE FIT CL HOLE THREAD DIM TAP DRILL NORMAL FIT. Title: Tap Drill & Clearance Holes for Screw Threads 0-80 to 0.5 inch.xls Author: Richard Wegner Created Date:To add hole callouts in a drawing: Click Hole Callout on the Annotation toolbar, or click Insert, Annotations, Hole Callout. The pointer changes to . Click the edge of a hole, then click in the graphics area to place the hole callout. A Hole Callout is inserted and the Dimension PropertyManager appears.The tables below also list the standard sizes for both close and free clearance holes. Tap styles - There are three different kinds of hand taps: taper, plug, and bottoming. Each refers to the amount of tapered threads at the start of the tap. Taper taps have around 8-10 tapered threads, providing a relatively gradual cutting action.If you add the countersink or counterbore you should only see the thread call out displayed, save your file and close. Go to the *.hol file and edit the DRILLED_DEPTH value for the desired hole to THRU_ALL, save *.hol file and re-open Creo. Edit the definition of the hole, select the Note tab, and select Reset.For example, a through hole tapped M6 will have a callout reading. M6-6H THRO. A blind hole with a 6mm deep thread will have a callout reading. M6-6H x 6 MIN FULL THREAD. The problem comes when I use the 'Up To Next' end condition in my hole wizard. Solidworks sees this type of hole as a blind hole. So, for example, I drill and tap a hole ...Tap Drill Clearance Drill Aluminum, Brass, Plastics Steel, Stainless Steel, Iron Close Fit Standard Fit 75% Thread 50% Thread Screw Size Major Dia (mm) mm per Thread Drill Size Closest Imperial Drill Size Closest Imperial Drill SizeDrilling a hole in somebody's skull was all the rage 4,000 to 12,000 years ago. In fact, 5 to 10 percent of skulls from this period have a hole in them, made while the person was s...A blind hole requires the tap to pull the chip out of the hole, meaning it is a spiral fluted tap. The most expensive tap and probably the weakest. There are three different chamfer lengths available in taps bottom, plug, and taper/hand. Bottom has 1-2 thread pitch chamfer, plug 3-5 tpc, and taper/hand has 7-10 tpc.6H is the preferred tolerance class at Husky. Class 6H8G is only permissible on tool and alloy steels. Chamfer Ø = Tap drill Ø + (N x pitch) With Nnom=1.5, Nmin=1.3, Nmax=1.7 Given values apply to cut tap 6H holes. All dimensions in mm. ISO261 & ISO965 metric screw threads. ISO metric screw threads are designated M10 X 1.0-6H.Fox Hole Tap & Pizzeria, McHenry, Illinois. 7,110 likes · 3 talking about this · 5,943 were here. BEST THIN CRUST PIZZA IN TOWN! If you enjoy tradition,...If you are going to tap a 4.8mm hole with M6, then you are going break the tap for sure. Make a print out for metric threads and tape it to your shops wall. Simple. But one thing you are correct juergenwt, on drawings metric threads don't have a thread pitch described, unless, its a fine pitch thread. TDegenhart , here is a simple chart for you.The counterbore symbol is used on a drawing to indicate that a counterbore hole feature is required. A counterbore is a flat-bottomed cylindrical hole that is larger than and coaxial to another cylindrical hole. It is used to provide a flat and recessed mounting surface for mating parts. The hardware most commonly used with a counterbore is a ...Visit the top menu bar on the upper right-hand side of your screen. Select Insert > Features > Advanced Hole. Select Near Side. Dimension the position of the hole in the Position tab of the Property Manager. Choose the first hole feature you want on your customized hole. Select the Insert Element buttons to insert the rest of your desired ...6H is the preferred tolerance class at Husky. Class 6H8G is only permissible on tool and alloy steels. Chamfer Ø = Tap drill Ø + (N x pitch) With Nnom=1.5, Nmin=1.3, Nmax=1.7 Given values apply to cut tap 6H holes. All dimensions in mm. ISO261 & ISO965 metric screw threads. ISO metric screw threads are designated M10 X 1.0-6H.For instance, on a M12 x 1.75 x 85 callout, M12 is the diameter. It means the external threads are 12 mm (0.47 in) wide. 4. Read the next number to figure out the screw’s pitch. The pitch represents the distance in millimeters between the grooves on the screw’s shaft. It will follow an “x” after the diameter number.If you are going to tap a 4.8mm hole with M6, then you are going break the tap for sure. Make a print out for metric threads and tape it to your shops wall. Simple. But one thing you are correct juergenwt, on drawings metric threads don't have a thread pitch described, unless, its a fine pitch thread. TDegenhart , here is a simple chart for you.No worries, SW has a pretty vertical learning curve. So if you use 'HOLE-DEPTH' for the drill depth and the tap depth in a blind hole, your machinist isn't going to be pleased.Using the 'up to next' option for a tapped hole does imply that the thread is continuous through its entire depth - the difference in the callout will be that the hole is …

To define a derived hole callout standard: Locate and open calloutformat.txt. Copy and paste content describing the ANSI standard. Using only upper case letters, substitute the new derived standard name for ANSI in this copied section of text in the file. Modifying the Hole Callout Format.. Craigslist fargo for sale

tap hole callout

An engineering drawing should specify exactly enough information to produce the desired part, and no more. A tap drill is used to form the initial hole before a tap forms the threads. Whether or not the size of that tap drill should be on the drawing may not be as obvious as you might think. Remember guys, we want an H7 tolerance (picture by ...Learn how to create hole callouts that will automatically insert useful information in SOLIDWORKS Drawings. We will also look at a way to troubleshoot hole c...Modifying the Hole Callout Format. You can modify the hole callout format by editing the hole callout format definition file, calloutformat.txt. Below is an example for editing calloutformat.txt. Using the code of the symbol library, you can position symbols and order them in the definition of each hole wizard type.You add hole callouts to annotate the Toolbox holes in your drawing with dimensions and descriptions. You can create a hole table by selecting holes with callouts. The table lists the locations and descriptions of the selected holes. The format and content of hole callouts depends on: Hole category. Counterbore. Countersink. Thru Hole. TapCommonly used sizes are 1/⁄ 8 , 1/4 , 3/⁄ 8 , 1/2 , 3/4 , 1, 1 1/⁄ 4 , 1 1/2 , and 2 inch, appearing on pipes and fittings by most U.S. suppliers. Sizes smaller than 1 ⁄ 8 inch are occasionally used for compressed air, while sizes larger than 2 inches are uncommon, due to the use of alternative methods of joining that are used with ...Standard Callout Formats with Examples. A standard threaded hole callout typically includes the thread size, type, and, if necessary, the depth of the thread. For example: Metric Thread Callout: M8 x 1.25, where 'M8' indicates an 8mm diameter and '1.25' the pitch. Unified Thread Callout: #10-32 UNC, where '#10' is the size, '32' the number of ...... Dimensioning,Ordinate Dimensioning,Bolt Holes Dimensioning,Hole Callouts,Threaded Hole Callout,General Dimensioning and Tolerancing,GD&T,ISO,ANSI,CobanFor holes with a depth twice the diameter of the fastener, the tap depth should be: Thread Depth + (Thread Pitch * 9) For other holes the tap depth should be: (Thread Depth + (1 + Thread Pitch * 4)) + (Thread Pitch * 5) What Is the Callout Symbol of a Blind Hole? The callout symbol for a blind hole is shown in the upper right corner of Figure 1 ...We have the engineer in house that is designing this. There are some questions from the programing side as how to call out the tapped hole on the drawing. If you are going to use .2500 - 28 UNJF-3B insert, you need to tap your hole with an STI tap, so the Heli Coil will fit.Choose the Best Hole Size to Start. Let’s get ahead of the game right from the start by choosing the right hole size. It may surprise you to learn that the size recommended on the tap’s packaging or in the typical charts is usually NOT the best size to use!. Full details here, but in general, you want to select a hole size that matches a good …Find out how to repair damaged vinyl siding on your home, from small holes to large cracks. Expert Advice On Improving Your Home Videos Latest View All Guides Latest View All Radio...To determine what tap drill size you need, go to the “Inch Tap Drill Sizes” table in our Drill Tap Chart. (See Figure 1.) In the left-hand column of the table, you will see two 1/4” options. The first option, 1/4″-20 is the coarse thread option (fewer threads per inch). The 1/4″-28 is the fine thread option..

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