Crankshaft: a rotating shaft which, in conjunction with connecting rods, coverts reciprocating motion of pistons into rotational motion.

The Reinosa Steel Plant is a leading global manufacturer of both C.G.F. Crankshafts and Built-Up Crankshafts. Crankshaft manufacturing demands a high degree of practical skill and advanced technical knowledge. We have optimized manufacturing technology to develop crankshafts that are both efficient and fatigue resistant. We are an approved manufacturer of clean steels and our products meet the most demanding specifications. Our crankshaft production process is fully integrated, forming a dedicated manufacturing line and allowing the Reinosa Steel Plant to optimize planning, have greater production control, and reduced lead times. Crankshafts are divided into two primary types:

  • G.F / Monoblock Crankshafts (4 stroke diesel engine)
  • Built-Up Crankshafts (2 stroke diesel engine)


C.G.F. crankshafts (Continuous Grain Flow) are created through an advanced forging process that optimizes grain direction, resulting in a superior product. C.G.F. crankshafts are used in marine propulsion, electrical power generation, auxiliary systems, and the nuclear sector. These crankshafts have a dedicated production line at the Reinosa Steel Plant to meet all C.G.F system standards for heat treatments and machining. Built-up crankshafts include a crank-arm terminating with a tubular part, and another crank-arm terminating with a pin part extending into and fitting the tubular part. Our built-up crankshafts are used for low speed engines exclusively in marine propulsion.


Additionally, the Reinosa Steel Plant manufactures crankshafts for hyper and reciprocating compressors aimed at polyethylene plants, refineries, chemical and petrochemical industry. With over 100 years of experience, the Reinosa Steel Plant can meet all crankshaft industry needs and specifications.


C.G.F. Crankshafts

  • Ø Cylinder bore: ≥ 260 mm.
  • Power: ≥ 1500 kw.
  • length: 8.5 metros.
  • weight: 16 tons.
  • Steels: Carbon and alloyed.

Built up Crankshafts

  • Ø Cylinder bore: ≥ 500 mm.
  • Power: ≥ 5000 kw.
  • length: 18 metros.
  • weight: 220 ton.
  • Steels: Carbon and alloyed.


  • Energy
  • Capital Goods
  • Shipbuilding and Offshore


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The Reinosa steel plant has specific units for forging and casting pieces with a worldwide activity scope, providing solutions to meet the needs of sectors such as shipbuilding (both mercantile and naval) electrical power generation, cement manufacturing plants, mineral preparation plants, steel and iron industries, heavy machinery components, and many more. We manufacture machined finished forgings (up to 70 tons) and castings (up to 140 tons). The Reinosa steel plant provides complete tailor-made solutions according to our customers’ needs in all sectors.