Threads & Spanner Sizes

Threads & Spanner Sizes

BSP(Britsih Standard Pipe)
BSP sizes were originally based on the inner diameter (measured in inches) of a steel tube for which the thread was intended.
BSP causes some confusion when it comes to sizing if you are not sure, please refer to the additional info for more help.
 
BSP    TPI    Ext Dia-mm

1⁄8"     29     9.1
​1⁄4"     19     12.3
​3⁄8"     19     15.8
​1⁄2"     14     19.8
​3⁄4"     14     25.3
1"       11     31.8

 
 Additional BSP Info

 

 

Nuts & Bolts - Spanner Sizes

Thread      Spanner       Thread  Spanner
 4mm      7mm              3/16"      3/8"
 5mm      8mm              1/4"        7/16"
 6mm      10mm            5/16"      1/2"
 7mm      11mm            3/8"        9/16"
 8mm      13mm            7/16"      5/8"
 10mm    17mm            1/2"        3/4"
 12mm    19mm            9/16"      1"
 14mm    22mm            3/4"        1.1/8"
 16mm    24mm                 
 20mm    30mm   

 

Japanese

Thread      Spanner

4mm            7mm         
5mm            8mm          
6mm           10mm        
8mm           12mm
10mm         14mm       
12mm         17mm    
14mm         19mm
16mm         22mm
 

 

 


 

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