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Home > Forums > Engineering Forums by Industry > Constructed Items > Transmission structure engineering Forum

ANSI/ASME B18.2.1 Metric vesion code

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nitin36537 (Civil/Environmental)

7 Dec 11 22:00

For one of our project we have supply Bolts as per ASTM A394-08 , but having diameter = 16 millimeter. ASTM A394-08 refer to ANSI/ASME B18.2.1 for inch dimensions. Which is the equivalent code of B18.2.1 with metric dimension ?

As per ASTM A394-08 Thread length = 1.25 " for 5/8" Dia bolts , while as per B.18.2.1 it is 1.5" . Why ?

Thanks

Nitn Patel

transmissiontowers (Structural)

9 Dec 11 20:14

IIRC the thread length is limited in A394 because they want to exclude the threads from the shear plane. In the tower world we don't count on the bolts being tight to transfer the load through friction, only through shear through the bolt shank.

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