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Thread Data

Thread Data

Metric Threads

Diameter Coarse (Standard) Fine Extra Fine Superfine
M1 0.25mm 0.2mm    
M1.6 0.35mm 0.2mm    
M2 0.4mm 0.25mm    
M2.5 0.45mm 0.35mm    
M3 0.5mm 0.35mm    
M3.5 0.6mm 0.35mm    
M4 0.7mm 0.5mm    
M5 0.8mm 0.5mm    
M6 1mm 0.75mm    
M7 1mm 0.75mm    
M8 1.25mm 1mm 0.75mm  
M10 1.5mm 1.25mm 1mm 0.75mm
M12 1.75mm 1.5mm 1.25mm 1mm
M14 2mm 1.5mm 1.25mm 1mm
M16 2mm 1.5mm 1mm  
M18 2.5mm 2mm 1.5mm 1mm
M20 2.5mm 2mm 1.5mm 1mm
M22 2.5mm 2mm 1.5mm 1mm
M24 3mm 2mm 1.5mm 1mm

 

Imperial Threads

BA Thread Angle - 47.5 degrees

BSC (Cycle) Thread Angle - 60 degrees

BSF Thread Angle - 55 degrees

BSW (Whitworth) Thread Angle - 55 degrees

UNC Thread Angle - 60 degrees

UNF Thread Angle - 60 degrees

Screw Sizes
No.2 = 2.2mm
No.4 = 2.9mm
No.6 = 3.5mm
N0.7 = 3.9mm
No.8 = 4.2mm
No.10 = 4.8mm
No.12 = 5.5mm
No.14 = 6.3mm

TPI is 'Threads per Inch' 

Diameter UNC TPI UNF TPI BSF TPI BSC TPI BSW TPI
No.2 56 64      
No.4 40 48      
No.6 32 40      
No.8 32 36      
No.10 / 3/16" 24 32 32 32 24
1/4" 20 28 26 26 20
5/16" 18 24 22 26 18
3/8" 16 24 20 26 16
7/16" 14 20 18 26 14
1/2" 13 20 16 26 12
9/16" 12 18 16 26 12
5/8" 11 18 14 26 11
3/4" 10 16 12 26 10
7/8" 9 14 11  26  9
1" 8 14 10 26 
1 1/8" 7 12  
1 1/4" 7 12  
1 3/8" 6 12   
1 1/2" 6 12   
           
BA Screw Number TPI Diameter(")      
12 90.9 0.051      
11 81.9 0.059      
10 72.6 0.067      
9 65.1 0.075      
8 59.1 0.086      
7 52.9 0.0982      
6 47.9 0.11      
5 47.9 0.126      
4 38.5 0.142      
3 34.8 0.161      
2 31.4 0.185      
0 25.4 0.236

 

Thread Names

BSF - British Standard Fine

BSC - British Standard Cycle, often simply referred to as 'Cycle' or 26TPI

BSW - British Standard Whitworth

BSP - British Standard Pipe

UNF - Unified National Fine

UNC - Unified National Coarse

BA - Britsh Association

 

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