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Porsche 930 CV joints are found on independent suspension axles. They measure about 108mm in diameter, 40mm thick, and have a 28 spline center. This CV Joint Originally came stock on a Porsche 911 Turbo from 1975 to 1989. The Porsche 911 Turbo is better known in the community as the Porsche 930. Porsche 930 CV's were originally used in the off-road community because they were larger in diameter than beetle or bus CV joints. Since Porsche 930 CV's are larger in diameter they support more horsepower and allow for more angle on the axle. The Porsche 930 cv has a static torque rating of approximately 2,729 foot pounds. More angle translates into more off road suspension wheel travel but CV’s lose 30 percent of torque rating at angles over 22 degrees. To compensate the off road community went to 934 cv joints with almost double the torque rating. The Porsche 930 CV joint was designed for a 10mm bolt. The 10mm bolt is slightly larger than the 3/8-24 at 0.3937 Dia., and a slightly higher tensile strength (150,800 vs 150,000 psi for a class 10.9 or grade 8 bar with a 1 inch cross sectional area). A 3/8-24 bolt has a cross sectional area of 0.0875. Class 12.9 has a tensile strength of 170,000 psi, same as ARP stainless 300 and requires more torque. In the off-road community everyone typically uses an American 3/8-24 bolt because they have greater availability and less cost in the bolts above grade 8. The 930 CV joints generally range from stock GKN German, to EMPI Chinese, to American Pro-Am and Kartek fully race CV joints