ShaftsTransmission shafts
Double-Ended Involute Spline Heavy-Duty Transmission Shaft
A double-ended involute external spline shaft with a stepped support body for high-torque transmission and precise alignment in heavy-duty industrial drives.
Spline Shaft Machining Capability
For shaft-type parts, the shop can machine lengths up to 10,000 mm including clamping and outside diameters up to Ø1,500 mm, with single-piece weights up to 8 t. Keyways, splines, threads, and end-face flange holes can be machined in the same production flow.
Journal tolerances can be held to h6 / IT7 with surface roughness down to Ra 0.8, and radial runout can be controlled to ≤0.02 mm. Dimensional and runout requirements are checked against the drawing before shipment.
Heavy-Duty Transmission Applications
The double-ended involute spline interface distributes circumferential load evenly and allows some axial assembly adjustment, making this shaft type suitable for high-torque, reversing, and shock-loaded drive trains. The stepped support body provides bearing seats and axial locating shoulders for bearing, spacer, and locknut assembly.
These shafts are commonly used between power sources and working mechanisms in hardened gear reducers, planetary gearboxes, construction machinery, metallurgical mills, and mining hoists.
Material, Heat Treatment, and Quality Control
Typical material is 42CrMo or 40Cr alloy steel forging. Shafts are quenched and tempered to improve comprehensive mechanical properties, and spline tooth surfaces are hardened and precision machined for wear resistance under heavy and alternating loads.
Heat treatment can be performed on shafts up to 10,000 mm long. Material certificates, heat-treatment records, and dimensional reports can be supplied as required.
Customization and Lead Time
Spline module, tooth count, pressure angle, accuracy grade, tooth hardness, journal size, overall length, and end-face hole pattern are produced to drawing or sample. Keyways, threads, flange holes, and axial locking features can be added as required.
Typical lead time for shaft orders is 8–12 weeks after drawing approval, depending on material, heat-treatment, and inspection requirements.
Specifications
- Typical materials
- 42CrMo / 40Cr alloy steel forgings
- Heat treatment
- Quenching and tempering; spline tooth surface hardening
Common questions
- Can you machine this part to my drawing?
- Yes. Every part is quoted from the drawing. Send a PDF, DWG, DXF, STEP or IGES file with the material, quantity and any inspection requirements, and we reply within one working day.
- How are the material and heat treatment decided?
- They follow your drawing. The specification table shows the range normally used for this part type; the final material and heat treatment are confirmed with the quotation.
- What lead time and inspection come with the part?
- Lead time is set in the quotation and depends on material, size, quantity and inspection scope. Material verification, in-process checks and final inspection records are archived with the part, and any extra certification is agreed before production.
- How is the part packed for export?
- Export parts are rust-proofed and packed for the transport method and destination confirmed in the quotation, with lifting points and markings agreed before dispatch.
Every part is quoted from the drawing itself, not from a size band. Send it over and we answer with the process, the lead time and the tolerance we can hold.
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