Crankshafts
Milwaukee ForgeTech manufactures custom forged crankshafts for demanding industrial and heavy equipment applications. We produce forged crankshafts designed to perform under high loads, cyclic stress, and demanding operating conditions.
Forged Crankshafts Manufacturer
Milwaukee ForgeTech manufactures custom forged crankshafts for demanding industrial and heavy equipment applications. We produce forged crankshafts designed to perform under high loads, cyclic stress, and demanding operating conditions.
If you have a drawing or specification, request a quote or upload your file to get started.
What Are Forged Crankshafts?
Forged crankshafts are critical rotating components used in engines, compressors, and power transmission systems where strength, fatigue resistance, and dimensional stability are required.
A crankshaft consists of journals, crankpins, and counterweights that must be precisely formed and machined to ensure balance, alignment, and reliable operation. Crankshafts are typically forged to near-net shape and then machined to achieve final geometry and tolerances. Crankshafts require precise machining of journals and balancing to ensure smooth operation at speed.
We produce forged crankshafts to customer specifications based on load, rotational speed, and service requirements.
Why Forging Is Used for Crankshafts
Forging is used for crankshafts because these components are subjected to:
high cyclic loading
combined bending and torsional stress
vibration and dynamic loading
impact and transient loads
The forging process improves the internal structure of the steel and supports grain flow aligned with the crank geometry, improving fatigue resistance at journals and fillets. This produces crankshafts that perform reliably under demanding conditions.
Materials for Forged Crankshafts
Material selection depends on load conditions, fatigue requirements, and operating environment.
Common alloy steels used in forged crankshafts include:
4140 Alloy Steel
Used when strength and toughness are required throughout the component.
through-hardenable
high strength and fatigue resistance
suitable for crankshafts under continuous load
8620 Alloy Steel
Used when wear resistance is required at journals and bearing surfaces along with a tough core.
compatible with carburizing
hard outer surface after heat treatment
tough internal core
Selecting between 4140 and 8620 depends on whether the crankshaft requires uniform strength or a hardened surface for wear-critical areas.
How Forged Crankshafts Are Manufactured
We produce forged crankshafts using hammer forging and press forging, depending on geometry, tolerances, and production requirements.
Hammer forging is used for short- to medium-volume runs and more complex geometries.
Press forging is used when controlled deformation and tighter tolerances are required.
Applications for Forged Crankshafts
Forged crankshafts are used in systems that require reliable motion conversion and operate under demanding conditions, including:
industrial engines
compressors and pumps
construction equipment
heavy machinery
These components must maintain fatigue resistance, dimensional stability, and balance under continuous cyclic loading.
Capabilities and Production Range
We manufacture forged crankshafts within the following general range:
forging weights from approximately 2-to-100 pounds
short- to medium-volume production
custom die design and engineering support
Forged crankshafts can be supported with secondary machining, balancing, and heat treatment as required. Critical features such as journals, fillets, and bearing surfaces are machined to meet dimensional and performance requirements.
Why Work With Milwaukee ForgeTech
Customers choose Milwaukee ForgeTech as a forged crankshafts manufacturer because we provide:
over 100 years of forging experience
hammer and press forging capabilities
engineering collaboration and support
consistent quality and reliable delivery
flexible production for short- to medium-volume runs
Request a Quote
If you are sourcing a forged crankshafts manufacturer or supplier, we can help.
Send us your drawings or specifications and we will review your project and recommend the appropriate forging method and material.