Splined Shaft – Steel Bright Bar Applications
A splined shaft is a torque-transmitting component featuring external or internal splines
that engage with mating parts such as gears, hubs or couplings.
Splines allow precise torque transfer while permitting axial movement when required.
For this reason, splined shafts are manufactured from steel bright bars
with tight tolerances, high strength and excellent surface integrity.
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Where Splined Shafts Are Used
- Automotive transmissions and differentials
- PTO and agricultural drivetrains
- Industrial gearboxes
- Construction and mining equipment
- Power transmission assemblies
Why Steel Bright Bars Are Used for Splined Shafts
- High torsional strength for torque transfer
- Tight dimensional control for accurate spline fit
- Good machinability for spline cutting or rolling
- Uniform mechanical properties for fatigue resistance
- Reliable heat treatment response
Splined Shaft – Typical Geometry & Machined Features
Splined shafts feature precisely machined external or internal spline profiles.
Accuracy of tooth form, pitch and concentricity is critical for load distribution
and service life.
Common Steel Grades Used
| Application Type | Typical Steel Grades |
|---|---|
| Standard Automotive & Industrial Use | EN8, EN8D, C45 |
| Medium to Heavy Load Applications | EN19 |
| High Torque & Fatigue-Critical Use | 42CrMo4, EN24 / 4340 |
Typical Processing & Operations
- Cold drawn or peeled & polished bright bars
- Spline cutting or spline rolling
- CNC turning and finishing
- Induction hardening (as specified)
- Surface treatment as per application
Bright Bar Sections & Supply Form
- Round bright bars (most common)
- Custom diameters based on spline design
- Straight lengths suitable for spline machining
Manufacturing & Quality Considerations
- Strict dimensional inspection of spline profiles
- Concentricity control for smooth engagement
- Surface integrity for wear resistance
- Traceability for OEM supply
Related Components
- PTO Shafts
- Drive Shafts
- Coupling Shafts
Why Steelmet Industries?
- Bright bars suitable for spline machining
- Supply of EN8, EN19 and alloy steel grades
- VD route steels for fatigue-critical splined shafts
- Inspection support via NABL-certified laboratories
FAQs
Why are splines preferred over keys?
Splines distribute load over multiple teeth, reducing stress concentration
and improving torque capacity.
Which steel grade is commonly used?
EN8 is common for standard use, while EN19 and 42CrMo4 are selected for higher loads.
Are splined shafts heat treated?
Yes. Induction hardening or through hardening may be applied depending on service conditions.
Contact for Enquiries
For sourcing steel bright bars for splined shaft manufacturing: