Have you ever wondered what those cryptic numbers on nuts and bolts mean? In this blog post, an experienced mechanical engineer demystifies thread pitch and explains how to decipher the code. With clear examples and helpful charts, you’ll learn the difference between metric and imperial thread standards and gain practical tips for avoiding costly mistakes. Whether you’re a professional or DIY enthusiast, this guide will give you the knowledge to confidently select the right fasteners for your project.
Thread Pitch: Also known as screw pitch, it refers to the axial distance between two corresponding points on the median line of adjacent threads, or the distance between adjacent crests or troughs.
Metric thread pitch is directly marked with distance (in millimeters, mm). For example, in M8*1.25, the 1.25 indicates that the thread pitch for M8 is 1.25MM.
Sometimes, out of habit, people tend to omit the thread pitch for commonly used metric threads, such as M8, which implies that the thread pitch is 1.25MM by default.
However, it’s best to avoid abbreviation to prevent unnecessary misunderstanding.
The thread pitch of a British or Imperial nut is marked by the number of threads contained within each inch.
For example, in 1/4-20, the 20 indicates that there are 20 threads per inch, which is approximately equivalent to 1.27mm in metric units.
However, it is not indicated as 1.27. For standard threads with a diameter less than 1/4 inch, the diameter is no longer indicated as a fraction like “1/4,” but is indicated by the number, as seen in 10#-24, 8#-32, etc.
(Including Coarse and Fine Threads)
Units are in millimetres (mm)Nominal Diameter Thread Pitch (i.e., Threads per Inch) Coarse Threads (UNC) Fine Threads (UNF) M1 0.25 0.2 M1.2 0.25 0.2 M1.6 0.35 0.2 M2 0.4 0.25 M2.5 0.45 0.35 M3 0.5 0.35 M3.5 0.6 0.35 M4 0.7 0.5 M5 0.8 0.5 M6 1 0.75 M8 1.25 1 M10 1.5 1.25 M12 1.75 1.25 M14 2 1.5 M16 2 1.5 M18 2.5 1.5 M20 2.5 1.5 M22 2.5 1.5 M24 3 2 M27 3 2 M30 3.5 2 (M33) 3.5 2 M36 4 3 (M39) 4 3 M42 4.5 3 (M45) 4.5 3 M48 5 3
(Including Coarse and Fine Threads)Nominal Diameter Diameter Size Thread Pitch (i.e., Threads per Inch) inch mm Coarse Threads (UNC) Fine Threads (UNF) 0# 0.06 1.524 – 80 1# 0.073 1.854 64 72 2# 0.086 2.184 56 64 3# 0.099 2.515 48 56 4# 0.112 2.845 40 48 5# 0.125 3.175 40 44 6# 0.138 3.505 32 40 8# 0.164 4.166 32 36 10# 0.19 4.826 24 32 12# 0.216 5.486 24 28 1/4″ 0.25 6.35 20 28 5/16″ 0.3125 7.938 18 24 3/8″ 0.375 9.525 16 24 7/16″ 0.4375 11.113 14 20 1/2″ 0.5 12.7 13 20 9/16″ 0.5625 14.288 12 18 5/8″ 0.625 15.875 11 18 3/4″ 0.75 19.05 10 16 7/8″ 0.875 22.225 9 14 1″ 1 25.4 8 12 1-1/8″ 1.125 28.575 7 12 1-1/4″ 1.25 31.75 7 12 1-3/8″ 1.375 34.925 6 12 1-1/2″ 1.5 38.1 6 12 1-3/4″ 1.75 44.45 5 – 2″ 2 50.8 4.5 –
As the founder of MachineMFG, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business.
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