2022 01 05 nbsp 0183 32 Today s generation IMHO are more want vs need and that will change their attitude sooner rather than later Dan Participant Southeast MN Posts 2159 January 5 2022 at 11 54 am 2086885 I ve got a question that s seemingly unanswerable but I ve always been curious is there a resource link article document or own personal experience that will give 2010 07 09 nbsp 0183 32 07 02 2010 7 28 AM There is a common standard taught in school which says the drill depth should be deeper than the thread by 3 times the pitch This standard was apparently designed by guys who sell taps to replace the ones that get 2020 10 20 nbsp 0183 32 DIN 20400 Rd series Knuckle Threads for the Mining Threads with Large Load Bearing Depth DIN 40430 Pg series Steel Conduit Thread EN 1707 Luer Connections for Needles and Syringes2015 04 08 nbsp 0183 32 Nov 20 2014 Messages 670 Apr 8 2015 3 depends a lot on how the print is drawn here at work it is the total depth including point often we use a 150 drill point to flatten the hole out for great tap chip clearance but they do that so as not to break through and intersecting hole on the part 2008 04 15 nbsp 0183 32 Effective Threaded Hole Depth Effective Threaded Hole Depth Fairway Nuclear OP 8 Apr 08 11 56 Is here a quick reference to effective threaded tapped hole depth I realize this may be dependant on the grade of bolt used pitch etc Just looking for a quick reference or formula that may give some understanding Thanks RE Effective

Drilled Hole Depth Deep narrow holes with length to diameter ratios of larger than three should be avoided Deeper holes are possible but the drill will tend to wander and possibly break One way to avoid a deep narrow hole is to use a stepped entrance Blind holes should be drilled to a depth 25 deeper than the actual hole in order to provide space for chips For bored hole If you select both the threads will each be a little less than 189 the depth of the hole they will not meet in the middle For longer holes the threads will be cut to the maximum depth possible Tip for increasing overall thread depth Adding a counter bore will enable the thread tool to reach further A counter bore or countersink is also a great Design for Assembly DfA feature Coil 14 rows nbsp 0183 32 Metric threads Minimum modeled diameter mm Maximum modeled diameter mm 2016 04 26 nbsp 0183 32 Tapped hole depths are called to the bottom of the last full thread Last edited Nov 5 2015 Reactions TOOLMASTER Bill C and Fitter Bill 2 2000n7sph Registered Registered Joined Apr 26 2016 Messages 2 Apr 26 2016 4 Now this is the stuff I need to know Tony Wells Registered Registered Joined Jan 22 2011 Messages 8 031 Apr 26 2016 5 Given For blind holes the tap drill depth should be a minimum of six threads beyond the required minimum full thread depth If a bottoming tap is to be used the tap drill depth should be a minimum of two threads beyond the required minimum full thread depth or consult with Manufacturing for special cases Examples Thru 216 136 THRU 6X 216 1 172

2019 10 04 nbsp 0183 32 Fastener Thread Styles Have you ever been stuck trying to figure out when to use a coarse thread vs fine thread fastener Don t worry you aren t alone Most people would be surprised to learn about the significant characteristic differences between the two Each type of threading has its own benefits that the other style lacks 2013 06 18 nbsp 0183 32 If we assume it is 25 177 0 42mm 1 177 0 017 quot then one thread pitch extra for minimum usable thread depth should be acceptable This brings the hole depth to 7mm 0 276 quot Then add another 3 thread pitches length for unusable threads on If we can access both sides the thread selection will allow selection of either or both sides If you select both the threads will each be a little less than 189 the depth of the hole they will not meet in the middle For longer holes the threads will be cut to the maximum depth possible Tip for increasing overall thread depthExampe I m using a 250 20UNC There are 20 threads per inch or 05 inches per thread 05 x 2 1 inch drill depth minimum beyond your full thread depth Drill Depth The drill depth E is the same as the clearance above In order to get the full thread depth per the requirement the chamfered tip of the tap must have room to extend past the threaded portion 2009 09 14 nbsp 0183 32 Tap drill depths for spiral point plug tapping blind holes For over 40 years I have waited for a definitive formula that would work well for calculating tap drill depths for blind holes For 30 years I have used the simple formula of Thread Depth Thread Pitch 9 for threads of two diameters of depths

Drill Depth Clearance in Blind Holes Chamfer Teeth One Pitch 1mm Clearance Bottom Tap has 1 to 2 teeth in chamfer or lead Semi Bottom Tap has 2 to 3 teeth in lead Modified Bottom has 2 to 4 teeth in lead Plug Tap has 3 to 5 teeth in lead Modified Plug has 5 to 7 Roll Form Tap has typically 2 1 2 Example 1 4 20 Roll Form tap 1 2 deep All blind hole thread repairs require a great deal of care Never drill deeper than the original hole Use a feeler gauge to measure depth of hole Transfer the measurement to the drill bit Wrap masking tape around the bit keeping the edge closest to the bit s blade on the mark The edge of the tape acts as the drill bit s depth gauge Never drill deeper than this point A chemical 2014 08 24 nbsp 0183 32 08 26 2014 01 37 PM The intent is to have 30mm depth of thread minimum That is if the 10mm plate is always 10mm minimum There is typically only one reason to know the drill depth and that is to know if you have enough material to not break out the other side 2021 12 26 nbsp 0183 32 Yes when I want a 10″ hole while pike fishing or in a permanent house setup I will go back to my propane auger Most times my 8″ LiteFlite fills my needs though if Im on the move stevenoak Participant Posts 927 December 24 2021 at 12 41 pm 2084191 Now I got the girly fancy carpeted topper Not a chance I m far enough south Lucky to get a foot of ice suzuki To determine the ideal minimum drill depth start with the basic rule the tap drill depth should be at least one thread or one pitch beyond the chamfer of the tap In other words for a 1 4 20 tapped hole requiring a 3 8 quot 375 quot thread depth using a two thread bottoming chamfer with a length of