Duckbill Model	Working Load *	Wire Rope Capacity
40	300 lbs (135 kg)	480 lbs (216 kg)
68	1,100 lbs (485 kg)	1,700 lbs (765 kg)
88	3,000 lbs (1,350 kg)	6,100 lbs (2,745 kg)
138	5,000 lbs (2,250 kg)	9,800 lbs (4,410 kg)

Anchor holding capacity will vary in different soils. Increased capacities can be expected in harder soil classes (numerically higher blow count classifications) and lower capacity can be expected in the softer soil classes (numerically lower blow count).

Anchors are rated in an average (class 5) soil condition. The rating is meant to be a reference for anchor selection. Proof-loading is the only way to insure the exact capacity of each installation.

Normal Soil is defined as follows:

Most Common Soil Types: Dense Fine Sand, Very Hard Silts and Clays, Dense Clays, Sands, Gravel, Hard Silts and Clays

*Typical Blow Count Per ASTM-D1586 is 24-40