Language
Φ1
Φ1.2
Φ1.6
Φ2
Φ2.5
Φ3
(Φ3.5)
Φ4
Φ5
Φ6
(Φ7)
Φ8
Φ10
(Non-preferred) dimensions in parentheses.
BS 4620 (T5) - 1970
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