Thread Pitch and Tooth Count Parameter Table

Thread Pitch and Tooth Count Parameter Table

Inch threads include Whitworth threads and Unified Standard threads.

Whitworth threads are the standard threads used for British inch fasteners, with a thread angle of 55 degrees. They are typically represented by the nominal diameter (in inches) and the number of threads per inch, using the symbol “”. For example, 1/2″-12BSW represents a coarse Whitworth thread with a nominal diameter of 1/2 inch.

Unified Standard threads are the standard threads used for American inch fasteners, with a thread angle of 60 degrees. They are generally represented by a code (for nominal diameters less than 1/4 inch) or the fraction of the nominal diameter in inches (for those greater or equal to 1/4 inch), the number of threads per inch, and a designation (UNC, UNF). For example, 1/2″-13UNC represents a coarse Unified Standard thread with a nominal diameter of 1/2 inch.

Thread Pitch and Tooth Count Parameter Table

Nominal diameters and threads per inch of Whitworth threads and Unified Standard threads:

Major Thread DiameterUnified Standard Thread ANSI B1.1-182Whitworth Thread BS84-1956
InchSize CodeCoarse Thread
UNC
Fine Thread
UNF
Size CodeCoarse Thread
BSW
Fine Thread
BSF
0.06000#80
0.06251/1660
0.07301#6472
0.08602#5664
0.09383/3248
0.09903#4856
0.11204#4048
0.12505#40441/840
0.13806#3240
0.15635/3232
0.16408#3236
0.18753/162432
0.190010#2432
0.216012#2428
0.21897/322428
0.25001/420281/42026
0.28129/3226
0.31255/1618245/161822
0.37503/816243/81620
0.43757/1614207/161418
0.50001/213201/21216
0.56259/1612189/161216
0.62505/811185/81114
0.687511/161114
0.75003/410163/41012
0.812513/1612
0.87507/89147/8911
1.000018121810
1.12501-1/87121-1/879
1.25001-1/47121-1/479
1.37501-3/86121-3/88
1.50001-1/26121-1/268
1.62501-5/81-5/88
1.75001-3/451-3/457
2.000024.524.57
2.25002-1/44.5
2.50002-1/24
2.75002-3/44
3.000034
3.25003-1/44
3.50003-1/24
3.75003-3/44
4.000044    
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Shane
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Shane

Founder of MachineMFG

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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