Question #484
Unless otherwise specified by the manufacturer, what is the allowable increase in the hook throat opening?
O ile producent nie określa inaczej, ile wynosi dopuszczalne rozwarcie gardzieli haka?
a
2%
2%
b
5%
5%
Correct answer
c
7%
7%
d
10%
10%
Why?
The allowable increase in hook throat opening (rozwarcie gardzieli haka) is 5% of its original dimension, unless the manufacturer specifies otherwise. Compare the current opening width with the original width; the hook must not be used once this limit is exceeded. The 10% limit concerns throat wear (wytarcie gardzieli haka) on a general-purpose overhead crane hook, not increased opening.