Caterpillar 156-6988 Cylinder Head Bolt Kit 18 Pieces

This cylinder head bolt kit contains 18 pieces of high-strength alloy steel fasteners designed to meet Caterpillar OEM specifications for small displacement diesel engines. Each bolt features M12 x 1.5 metric fine thread and 165 mm overall length with hex head drive. The phosphate coating provides corrosion resistance and consistent torque-tension relationship during installation. These bolts are engineered to withstand the high combustion pressures and thermal cycling inherent in Caterpillar C1.1, C1.5, C1.7, C2.2, 3013, 3014, 3024, and 3034 engine families. Direct replacement for Caterpillar part numbers 156-6988 and superseded 524-3348. Compatible with Perkins 400 series and Shibaura E-series industrial engines sharing the same cylinder head architecture. Kit quantity matches the cylinder head requirement for 3-cylinder engine configurations.