1 4 thread diameter Related Metric External Fasteners Thread Designations Sizes M1 6 M18 Metric External Fasteners Thread and Fastener Sizes M20 M50 Screw Thread Designations Minor Diameter Major Diameter Pitch Diameter UN Inch Internal Screw Threads Formulas and Calculator per ASME B1 1
For example 1 4 3 4 1 1 4 Below 1 4 the diameters are given by a series of numbers from 0 to 12 Each number describes an arbitrary diameter as shown in the below table It is also allowed to denote the diameters with a decimal value For example 0 250 1 4 0 4375 7 16 etc Standard Diameter numbers below 1 4 1 1 4 12 UNF Basic Thread Dimensions Pitch minor major diameters depth lead Tolerance range for all applicable classes and much more
1 4 thread diameter
1 4 thread diameter
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1 Thread sizes in inches are specified by diameter and threads per inch For example in the screw size 10 24 the first digit refers to the thread diameter the and second digit is threads per inch TPI When the diameter smaller than 1 4 the value is indicated by a number like 1 or No 1 Major Diameter 0 250 inches 1 4 inch Tap Drill Size Typically this would be around 0 201 inches for a 1 4 20 tap calculated by subtracting the pitch from the major diameter or using a tap drill chart Pitch 0 050 inches calculated as 1 TPI
Basic Major Diameter External Threads Basic Minor Diameter Internal Threads 0 80 UNF 80 0 060 0 047 1 64 UNC 64 0 073 0 056 2 56 UNC 56 0 086 0 067 2 64 UNF 64 0 086 0 069 4 40 UNC 40 0 112 0 085 5 40 UNC 40 0 125 0 098 5 44 UNF 44 0 125 0 100 6 32 UNC 32 0 136 0 104 6 40 UNF 40 0 136 The thread series is generally relative to the outside diameter of the screw 20 threads per inch on a 1 4 diameter screw is considered coarse 1 4 20 UNC On a 3 4 diameter screw 20 threads per inch is considered extra fine 3 4 20 UNEF It also plays a role in determining the length of engagement UN standard series thread
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Inch thread sizes are specified by the nominal major diameter and the number of threads per inch For example a 1 4 20 UNC coarse thread has a 1 4 nominal major diameter and 20 threads per inch while a 1 4 28 UNF fine thread has the same nominal major diameter but 28 threads per inch The nominal diameter of a thread is the diameter for which a thread is known We use the nominal diameter for the general identification of threads For example a thread with a callout of M10 1 5 has a nominal diameter of 10 mm Generally the nominal diameter of a thread is the same as the basic major diameter of the thread
The standard designation for a UTS thread is a number indicating the nominal major diameter of the thread followed by the pitch measured in threads per inch For diameters smaller than 1 4 inch the diameter is indicated by an integer number defined in the standard for all other diameters the inch figure is given Tap Drill Sizes for 1 4 28 UNF If not specified assume a thread depth of 75 You can learn more about thread depth in tapping here To get the tap drill size in other depths use our Tap Drill Size Calculator Over Wire Measurements for 1 4 28 UNF
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1 4 thread diameter - For example size x20 UNC refers to a coarse thread with a nominal diameter of and a TPI equal to 20 On the other hand size x28 UNF refers to a fine thread with a nominal diameter of and a TPI equal to 28 The table below contains dimensions for a