The safe working load of the B17 - Double Flared Coil Loop Insert is greatly increased over that of a B18 Single Flared Coil Loop. This increase in capacity is achieved by welding a second loop to the same coil. By adding the additional loop, it doubles the cross-sectional area of steel embedded in the concrete and at the same time, increases the area of the shear cone.
The design of the B17 insert leaves an open space between the two loops, allowing the B17 insert to “straddle” reinforcing steel or prestressing strands.
Standard sizes are shown in the chart and other sizes are available on special order.
Minimum spacing between inserts is twice the minimum corner distance.
Also available with special straight loops.