OX Block Instructions and Warnings (Rev. 5/22/18)
PN 230325
4
BUCKINGHAM MFG.
OX BLOCK
TM
Instructions and Warnings
PROPER USE
1.
Sheave-to-eye and hook-to-eye Working Load Limits must not be exceeded.
MBS (Minimum Breaking Strength) WLL (Working Load Limit)
2.
The OX BLOCK must be free to align with its load, without obstruction of the
body or friction bar.
3.
The OX BLOCK is designed for multi-braid synthetic ropes (maximum size 5/8”) and
should not be used with wire ropes or natural fiber ropes.
4.
Always ensure the OX BLOCK is attached to an adequate anchorage point that is capable of
safely supporting the load and that all rigging components (e.g. carabiners, hardware, pulleys, ropes,
slings, etc.) are rated and intended for use with the specific rigging application. In order to get the
full WLL from the OX BLOCK (sheave to eye) all components of the system must have a 10,000 lb.
rating and be configured so as not to reduce that rating. Ropes which have a higher safety factor
(generally 5 to 1) must have a 12,500 lb. rating to maintain the full WLL (sheave to eye) from the OX
BLOCK. The system components should be a minimum of 4 to 1 safety factor for exposure to heavier
loads. For example, if lowering 1000 lbs. the weakest link must be rated to 4000 lbs. minimum
breaking strength.
5.
Loads being lowered with friction assistance should be lowered under control; never allow
running or free falling of a load. Use a hand over hand method to control the rope.
SHEAVE-TO-EYE
MBS = 10,000 lbs
(4,536 kg)
WLL = 2,500 lbs
(1,134 kg)
HOOK-TO-EYE
MBS = 6,000 lbs
(2,722 kg)
WLL = 1,500 lbs
(680 kg)
WARNING:
Use synthetic ropes only.
Not to be used with wire
rope or natural fiber
ropes.
Maximum rope diameter
is 5/8”.
Load
Load
WLL 2,500 lbs
(1,134 kg)
WLL 1,250 lbs
(567 kg)
WLL 1,250 lbs
(567 kg)
WLL 1,500 lbs
(680 kg)
WLL 1,500 lbs
(680 kg)
Always use adequate
anchorage.
