The formula used to compute the safe
working load (SWL) for a bridle hitch with two, three,
or four legs (fig. 3-23) is SWL (of single vertical hitch)
x H (Height) divided by L (Length) x 2 = SWL. When
the sling legs are not of equal length, use the smallest
H/L measurement. This formula is for a two-leg
bridle hitch but it is strongly recommended it also be
used for the three- and four-leg hitches.
However, do not forget it is wrong to assume
that a three- or four-leg hitch will safely lift a load
equal to the safe load on one leg multiplied by the
number of legs.
Other formulas are as follows:
Single-Basket Hitch (fig. 3-24): For vertical
legs, SWL = SWL (of single-vertical hitch) x 2.
For inclined legs, SWL = SWL (of single-
vertical hitch) x H divided by L x 4.
Double-Basket Hitch (fig. 3-25): For vertical
legs, SWL = SWL (of single-vertical hitch) x 4.
For inclined legs, SWL = SWL (of single-
vertical hitch) x H divided by L x 4.
Figure 3-23.—Determination of bridle hitch sling capacity.
3-24
