This part is listed by BMW as BMW part number 11247834310 (11 24 7 834 310) and is described as the connecting rod bolt used on S54 engines produced after the 2/2003 production date. These bolts stretch when properly tightened and they cannot be re-used (also known as torque-to-yield bolts). These bolts must be replaced any time one is removed, such as during rod bearing replacement. These bolts are M10 diameter with 1.25 thread pitch (pre-2/2003 bolts are larger M11 diameter).
Sold per bolt (order 12 for the complete set).
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BMW Fitments:
3 Series
E46 (99-05) > M3
Z Series
E85 / E86 Z4 (03-08) > Z4 M