🛠️ What “One Side Thick, One Side Thin” Means
In Tata commercial vehicles like the Tata 1109, many shaft‑type parts (steering joints or driveline couplings) have splined or flanged ends that connect to other components. These ends can be:
Thick — heavier, larger flange or spline profile
Thin — smaller, lighter flange or spline profile
“One Side Thick, One Side Thin” means that this single part has two different end profiles:
➡️ One end is “thick” — usually a larger flange / heavier spline — matching one mating component (e.g., steering gearbox side or prop shaft side)
➡️ The other end is “thin” — usually a smaller flange / lighter spline — matching the other mating component (e.g., drag link, intermediate shaft, or differential companion flange)
This design helps the same part connect two components that use different sized splines/flanges.
📍 Where This Is Typically Used
For Tata 1109, this description most often applies to:
🌀 Steering Intermediate Joint / Steering Cross
Connects the steering gearbox output to the steering column/drag link
One end fits a bigger spline/flange on the gearbox
The other end fits a smaller spline/flange on the steering column