A New Standard for Bump Testing
ASTM, (American Society for Testing and Materials), organization has
updated their standard F883 to a 09 version. The revisions constitute a
new test for bump resistance in pin tumbler cylinders. Such a standard
testing method has been needed for some time now. Many manufacturers tell
locksmiths that their products are bump resistant but there is little
qualification of how much resistance is provided.
standard will eliminate that problem as it gives locksmiths a standard way to
measure bump resistance through some stringent testing. The test requires
each manufacturer to submit 5 samples of the cylinder to be tested and each
cylinder must be supplied with 7 operating cut keys. Why 5 cylinders?
To test the validity of a solution you need to demonstrate that it is successful
repeatedly, in this case, 5 times. Why 7 keys? Many cylinders that
claim bump resistance are patent protected to the point that blank keys aren't
available to allow making a bump key. If extra keys are supplied with the
cylinder to be tested, some of them can be turned into bump keys.
locksmiths conduct the testing and each locksmith must be familiar with bumping
techniques and have had good success in the past 2 years using the technique.
Each locksmith gets 2 of the operating keys supplied with each cylinder.
locksmith turns their operating keys into a bump key, actually two bump keys for
their are two design types that must be tried in each lock called a Pull and a
a locksmith has made his bump keys he can start testing. The test for each
cylinder must be completed at a rate of 10 impacts from each type of bump key
every 2.5 minutes to a maximum of 60 impacts within 15 minutes. Some
pretty significant testing when you consider that the same test must be
performed by each locksmith.
chart below shows the various grade levels at which a cylinder can qualify.
is of course one original operating key that isn't turned into a bump key.
That key is used at the end of the test to determine if the lock will still
operate after this concentrated attack. If it won't operate, the grade
level isn't changed since rendering it inoperable by the attack is a
good form of bump resistance.
this testing when looking for a bump resistant lock and ask the Grade level
where the lock qualifies.
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