Dimensions and Data Needed to Source Cross Shafts

The Short Answer

To source a cross shaft, provide four groups of information: the journal (trunnion) diameter, the overall span across the journals, the bearing cup or cap dimensions, and the application — vehicle, gearbox, or driveline model plus the OEM part number where available. With these, the supply side can identify or manufacture the part.

Cross shafts look simple but are precision fits: the journals run in needle bearings inside the cups, so diameters and spans are measured values, not estimates.

Key Dimensions to Measure

Measure the journal diameter at the bearing surface, not at a worn or corroded spot. Measure the span across opposite journals — the critical assembly dimension — and the length of each journal. Record the bearing cup outer diameter and length if cups are included or sourced together.

Note the retention method: snap rings, circlips, or plates, and their groove dimensions. Two crosses with identical journals can still differ in retention design, and the difference decides fitment.

• Journal (trunnion) diameter at the bearing surface.
• Span across opposite journals and journal length.
• Bearing cup outer diameter and length, where applicable.
• Retention method: snap rings, circlips, or plates, with groove dimensions.

Technical Data Beyond Dimensions

Material and heat treatment affect service life and are specified per part — crosses typically require hardened bearing surfaces, but the exact specification is confirmed per order. State whether a grease fitting or lubrication channel is required, and whether seals on the cups are needed for your application.

If the part is for a transmission or driveline operating under specific loads, describe the application honestly. Load assumptions made silently at the sourcing stage become failures at the service stage.

Identification When There Is No Part Number

Where the OEM part number is unknown, identification works from the application plus measurements: vehicle and gearbox or driveline model, the cross's position in the assembly, and the measured dimensions above. Photos of the old part alongside a ruler remain useful supporting evidence.

For repeated requirements, a sourcing partner can coordinate measurement of a sample and keep the confirmed data on record, so reorders start from verified specifications rather than fresh measurement.

What Is Confirmed Per Order

Fitment confirmation, material and heat-treatment specification, available quality documents, price, lead time, and minimum order quantity are all confirmed per order. For a first order, a sample or small batch allows fitment verification in the actual assembly before volume commitment.

A sourcing partner can coordinate the identification, the technical confirmation with manufacturing resources, and the order follow-up through to export delivery — you provide measurements and application details once, rather than negotiating them separately with each party.