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L9 Collar Hex Nuts are designed for high stress, severe service environments. L9 offers the highest mechanical strength, higher clamp loads and superior holding power. L9's special features control torque-tension characteristics to develop maximum, consistent holding power. 180,000 to 200,000 PSI tensile strength. Substantially stronger than SAE Grade 8 fasteners while possessing the minimum ductility of Grade 8 to eliminate embrittlement concerns.