Question #483
Unless otherwise specified by the manufacturer, what is the allowable wear in the throat of a general-purpose overhead crane hook?
O ile producent nie określa inaczej, ile wynosi dopuszczalne wytarcie gardzieli haka suwnicy ogólnego przeznaczenia?
a
5%
5%
b
3%
3%
c
10%
10%
Correct answer
d
7%
7%
Why?
Allowable hook throat wear (wytarcie gardzieli haka) is 10% of the original cross-sectional dimension at the worn location, unless the manufacturer specifies otherwise. This means loss of material, not an increase in the hook opening. The 5% limit concerns increased throat opening (rozwarcie gardzieli haka), so these two measurements must not be confused.