Vibration Impact Test
Vibration Impact Test (Horizontal impact) (Vertical impact)
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We conducted our own original severe vibration impact tests based
on the US NAS3350/3354 standard screw looseness test,
and verified that all types of Hard Lock nuts exceed this
evaluation standard by a clear margin. As self-locking nuts
used in civil engineering applications such as railways, highways,
bridges, pylons, etc., Hard Lock nuts are exposed to a wide range of
vibrations and impacts on a continuing basis. However,
the data from these tests proves that Hard Lock nuts
maintain a stable tightened condition regardless of
the type of impact to which they are exposed.
A performance comparison with other general-purpose nuts
demonstrates the clear superiority of Hard Lock nuts for
tasks where vibration resistance is paramount.
NAS3350 Standard Test Video
*In tests conducted according to the NAS3350, the HL nut cleared 30,0000cpm (17 min.), but as the video demonstration is too long, the length has been cut to 1 min, 24 sec.
NAS3350/3354 (US Aviation Standard)