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28th Jul 2009, 18:09

#2 (permalink)

stevef

Join Date: Feb 2006

Location: Station 42

Age: 69

Posts: 1,083

Received 103 Likes on 43 Posts

They're measured in 1/16"s.

Tube O/D Dash Number
3/16" = - 3
1/4" = - 4
5/16" = - 5
3/8" = - 6
1/2" = - 8
5/8" = - 10
3/4" = - 12

etcetera.

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