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Connectors (hooks, carabiners, and D-rings) must be capable of supporting at least 5,000 lbs.
(22kN). Connectors must be compatible with the anchorage or other system components. Do not
use equipment that is not compatible. Non-compatible connectors may unintentionally disengage.
See Figure 3. Connectors must be compatible in size, shape, and strength. Self locking snap
hooks and carabiners are required by ANSI Z359.1 and OSHA.
2.3 MAKING CONNECTIONS: Only use self-locking snap hooks and carabiners with this equipment.
Only use connectors that are suitable to each application. Ensure all connections are compatible
in size, shape and strength. Do not use equipment that is not compatible. Ensure all connectors
are fully closed and locked.
DBI/SALA connectors (snap hooks and carabiners) are designed to be used only as specifi ed in
each product's user's instructions. See Figure 4 for inappropriate connections. DBI/SALA snap
hooks and carabiners should not be connected:
A. To a D-ring to which another connector is attached.
B. In a manner that would result in a load on the gate.
NOTE: Large throat opening snap hooks should not be connected to standard size D-rings or similar objects
which will result in a load on the gate if the hook or D-ring twists or rotates. Large throat snap hooks are
designed for use on fi xed structural elements such as rebar or cross members that are not shaped in a way that
can capture the gate of the hook.
C. In a false engagement, where features that protrude from the snap hook or carabiner catch
on the anchor and without visual confi rmation seems to be fully engaged to the anchor point.
D. To each other.
E. Directly to webbing or rope lanyard or tie-back (unless the manufacturer's instructions for
both the lanyard and connector specifi cally allow such a connection).
F. To any object which is shaped or dimensioned such that the snap hook or carabiner will not
close and lock, or that roll-out could occur.
G. In a manner that does not allow the connector to align properly while under load.
Figure 3 - Unintentional Disengagement
If the connecting element to which a snap hook (shown) or carabiner attaches
is undersized or irregular in shape, a situation could occur where the connecting
element applies a force to the gate of the snap hook or carabiner. This force may
cause the gate (of either a self-locking or a non-locking snap hook) to open,
allowing the snap hook or carabiner to disengage from the connecting point.
Small ring or other
non-compatibly
shaped element
Force is applied to the
The Gate presses against
Snap Hook.
the Connecting Ring.
2.4 ANCHORAGE STRENGTH: The anchorage strength required is dependent upon the application:
A. FALL ARREST: In accordance with ANSI Z359.1, anchorages selected for fall arrest systems
shall have a strength capable of sustaining static loads applied in the directions permitted by
the system of at least:
•
5,000 pounds (22.2 kN) for non-certifi ed anchorages; or,
•
Two times the maximum arresting force for certifi ed anchorages.
When more than one fall arrest systems is attached to an anchorage, the applicable strength
requirement should be modifi ed by the number of systems attached to the anchorage.
A.
The Gate opens allowing
the Snap Hook to slip off.
4
Figure 4 - Inappropriate Connections
B.
C.
E.
F.
D.
G.
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