42CrMo4 Shaft Forgings
Custom 42CrMo4 shaft forgings manufactured to customer drawings for heavy machinery, power transmission and industrial equipment. Available as straight, stepped, flanged and hollow shafts with heat treatment, rough machining, ultrasonic testing and inspection documentation.
- Customer drawings
- Heat treatment
- Inspection reports
4340 Forged Shafts for High-Load Applications
42CrMo4 is a chromium-molybdenum alloy steel commonly selected for forged shafts requiring a practical combination of strength, toughness, fatigue resistance and wear resistance. It is widely used for components operating under torsional, bending, impact and cyclic loads.
We manufacture 42CrMo4 shaft forgings in straight, stepped, flanged, hollow and drawing-specific configurations. Each project is reviewed according to the finished dimensions, forging allowance, heat-treatment condition, mechanical-property requirements and inspection scope.
The forgings can be supplied in the as-forged, soft-annealed or quenched-and-tempered condition. Rough turning, machining allowances, ultrasonic testing and inspection documentation can be incorporated into the agreed manufacturing route.
Additional information
| Material Grade | AISI 4340 / SAE 4340 / UNS G43400 |
|---|---|
| Steel Type | Nickel-Chromium-Molybdenum Alloy Steel |
| Forging Process | Open-Die Forging |
| Product Forms | Straight Shafts, Stepped Shafts, Flanged Shafts, Hollow Shafts, Custom Shaft Profiles |
| Supply Condition | As Forged, Annealed, Normalized, Quenched and Tempered |
| Machining Condition | Black Forged, Shot Blasted, Rough Turned, Rough Machined |
| Testing Available | Chemical Analysis, Mechanical Testing, Hardness Testing, Ultrasonic Testing, Dimensional Inspection |
| Production Basis | Customer Drawings, Technical Specifications and Approved Inspection Requirements |
PRODUCT RANGE
4340 SHAFT FORGING TYPES
Drawing-based 42CrMo4 forged shafts for drive, transmission and rotating equipment.
Hollow Shaft Forgings
Reduced weight and material use without compromising performance.
PRODUCTION RANGE
Drawing-Based 42CrMo4 Shaft Production
Every 42CrMo4 shaft forging is reviewed as an individual project. Diameter, length, unit weight, section transitions, flange geometry, machining allowance and heat-treatment requirements are confirmed before production.
For an accurate quotation, please provide the finished drawing, required material standard, delivery condition, mechanical properties, inspection requirements, quantity and estimated annual demand.
PRODUCTION RANGE
FOR QUOTATION, PLEASE PROVIDE:
The following information helps us review the forging route, machining allowance and inspection scope.
- Finished drawing
- Material specification
- Heat-treatment condition
- Inspection requirements
- Quantity and annual demand
PRODUCTION PARAMETERS
| Requirement | Available Scope |
|---|---|
|
Diameter |
According to drawing and equipment review |
|
Length |
According to drawing and transport limits |
|
Unit weight |
Up to 20,000 kg, subject to review |
|
Geometry |
Straight, stepped, flanged, hollow or custom |
|
Surface condition |
Black forged, blasted or rough machined |
|
Heat treatment |
Normalizing, annealing, quenching and tempering |
|
Testing |
UT, hardness, mechanical and dimensional testing |
|
Documentation |
MTC and agreed inspection reports |
MATERIAL DATA
42CrMo4 Steel Forging Technical Data
The following values provide a general reference for 42CrMo4 / EN 1.7225 steel. Final chemical-composition and mechanical-property requirements must follow the agreed material standard, product dimensions, heat-treatment condition and customer specification.
Chemical Composition
| Element | Carbon, C | Manganese, Mn | Silicon, Si | Chromium, Cr | Molybdenum, Mo | Phosphorus, P | Sulfur, S |
|---|---|---|---|---|---|---|---|
|
42CrMo4 |
0.38–0.45 |
0.60–0.90 |
≤0.40 |
0.90–1.20 |
0.15–0.30 |
≤0.025 |
≤0.035 |
Mechanical Properties
Mechanical properties vary with the governing product standard, test direction, section size and quenching-and-tempering condition. Final requirements are confirmed against the customer drawing and agreed material specification.
| Property | Tensile Strength | Yield Strength | Elongation | Impact Energy | Brinell Hardness |
|---|---|---|---|---|---|
|
Typical +QT Reference |
750–1,200 MPa |
Section-dependent |
11–14% |
≥35 J |
Per agreed specification |
MANUFACTURING SCOPE
42CrMo4 SHAFT FORGING CAPABILITIES
The production route is developed around the shaft geometry, required forging ratio, heat-treatment condition, machining allowance and inspection specification.
Billets or ingots are forged to improve material consolidation and produce the required shaft profile with controlled machining allowance.
Normalizing, annealing, quenching and tempering can be arranged according to the required material condition and mechanical properties.
Rough turning, boring and machining can remove surface scale, establish reference surfaces and prepare the forging for inspection.
Chemical analysis, mechanical testing, hardness testing, ultrasonic testing and dimensional inspection are available according to the agreed inspection plan.
TYPICAL APPLICATIONS
Applications of 42CrMo4 Shaft Forgings
42CrMo4 shaft forgings are used for industrial components requiring a reliable balance of strength, toughness, fatigue resistance and wear performance.
Heavy Machinery Shafts
Drive shafts, transmission shafts and load-bearing shafts for heavy industrial machinery.
Axles and Crankshafts
Forged axle shafts and crankshaft blanks for machinery and power-transmission systems.
Gear and Coupling Shafts
Forged shaft blanks for gears, couplings, reducers and mechanical drive assemblies.
Mining and Energy Equipment
High-load shafts used in crushers, pumps, drilling equipment and energy systems.
From drawing review to delivery
01
Drawing, material, quantity, tolerances and standards.
02
Production route, material, machining allowance and lead time.
03
Coordinate manufacturing stages and required quality records.
04
Reports, export packing and shipment support.
Records that travel
with the forging.
Inspection requirements are defined during quotation—not added as an afterthought. Available documentation is confirmed against the project specification before production.
Material certificates & heat traceability
✓
Dimensional inspection report
✓
Ultrasonic / magnetic particle report
✓
Mechanical properties report
✓
Final documentation package
✓
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