cummins engine connecting rod , Iran

The Cummins engine connecting rod is manufactured from hot forged alloy steel grade 4340 or C70. Heat treatment including hardening and tempering brings the ultimate tensile strength to 950 to 1100 megapascals. The center-to-center length of the connecting rod in the 6BT model equals 169 millimeters. This length in the NTA855 model reaches 210 millimeters and in the KTA19 model reaches 228 millimeters. The small end bore diameter (piston side) in the 6BT measures 51 millimeters. The big end bore diameter (crankshaft side) in this model is 76 millimeters. The connecting rod cross section at midpoints is designed as an I-beam shape with web thickness of 8 to 12 millimeters. The complete connecting rod weight in the 6BT model is approximately 2.8 kilograms and in the KTA19 model is approximately 5.5 kilograms. The parallelism tolerance between the small and big end bores is controlled below 0.05 millimeters over the entire length.

The big end bore is cut at an oblique angle of 45 degrees relative to the vertical axis. The connecting rod bolts are manufactured from grade 12.9 steel with a diameter of 12 millimeters in the 6BT and a diameter of 16 millimeters in the KTA19. The final bolt torque in the 6BT equals 70 Newton meters plus an additional 90 degree angle. In the KTA19, this torque reaches 120 Newton meters plus an additional 120 degrees. The connecting rod bearing is manufactured from three layers of steel-nickel-babbitt with a total thickness of 2.0 millimeters. The babbitt layer thickness as the sliding surface is approximately 0.3 to 0.4 millimeters. The operating clearance between the bearing and the crankshaft journal in the 6BT equals 0.06 to 0.10 millimeters. The fillet radius at the big end bore for stress concentration reduction is machined to 3 millimeters. The oil hole in the small end has a diameter of 2 millimeters for oil spray to the underside of the piston. The internal surface roughness of the big end bore after honing reaches below 0.2 micrometers Ra.You can order and buy cummins engine connecting rod from Iran by contacting us through whatsaap and email.
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