FF-P-2827A
3.5 Detailed requirements. The padlock, components, and keys shall be as
specified in 3.5.1 through 3.5.4.1.
3.5.1 Body. The complete assembled body of the padlock shall have no openings
other than shackle openings, keyway and drainage holes. If drain holes are
included, they shall not allow manipulation of the lock. The body shall incorporate
a means to prevent access to the locking mechanism, except by use of the operating
key.
3.5.2 Shackle. The shackle dimensions shall be as specified in 3.4. The
shackle shall remain securely attached when the padlock is in the unlocked fully
opened position and shall be capable of being separated from the padlock only when
the padlock is disassembled.
3.5.3 Locking mechanism. The shackle shall be held in the locked position at
both heel and toe by a dead locking action. The padlock shall open when the key is
turned in the clockwise direction and lock when the key is turned in the
counterclockwise direction. The operating key shall be retained in the keyway of
the cylinder and shall not be removable when the padlock is in the open position.
The locking mechanism shall not depend on spring action to hold the shackle in the
locked position. End pressure on the locking mechanism, when exerted by a burglar's
tool known as a "shim" or "sneaker," shall not move it.
3.5.3.1 Cylinder assembly. The cylinder assembly of the locking mechanism
shall have a plug with only two distinct positions: locked and unlocked.
3.5.3.1.1 Cylinder assembly removal. The cylinder assembly shall be securely
retained within the padlock body when the cylinder plug is in either the locked or
unlocked position. When removed from the padlock body, the cylinder assembly shall
remain as one assembly.
3.5.3.1.2 Cylinder assembly interchangeability. A cylinder assembly from any
one padlock delivered under contract shall be interchangeable with a cylinder
assembly from any other padlock delivered under the same contract.
3.5.3.2 Keys. Each padlock shall be furnished with two keys. Identical keys
for each padlock shall be joined with a steel wire ring. The steel ring with keys
attached shall fit over the shackle. Padlocks supplied in a group as a set shall be
keyed alike, keyed individually or master keyed as specified (see 6.2).
3.5.3.2.1 Key material hardness. The key material shall have a hardness that
is not less than Rockwell hardness number of 75 on Rockwell B scale (75 HRB) in
accordance with ASTM E18.
3.5.3.2.2 Key deformation resistance. The key blank, cut as specified in
3.2.1 shall resist a torque of 8 pounds force-inch (lbf-in) (0.9 Newton meters
[Nm]) without permanent set deformation when measured at the end of an 8-inch (203
mm) lever. The maximum cross section of the material being torqued shall be no
greater than the thinnest section of the key blade (see 3.2.1 and 4.6.3.5).
3.5.3.2.3
Key shapes. The bows of the operating keys shall be identical.
3.5.3.2.4 Key markings. In addition to the individual key markings specified
in 3.5.3.2.5, all keys shall be stamped with: "US GOVT PROPERTY - DO NOT DUP."
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