SD-Double Joint – Compact Twin Universal Joint for Smooth PTO Power Delivery
The SD-Double Joint (double universal joint, double cardan joint, or twin U-joint assembly) combines two universal joints within a single compact housing with a centring yoke, producing a constant-velocity output that eliminates the speed fluctuations inherent in single U-joint designs. GBC offers both whole (DY) and welded (SDY) configurations across 12 sizes, ensuring compatibility with virtually any PTO shaft assembly used in Australian agriculture and industry.
Technical Specifications – SD-Double Joint (Whole / DY)
| Series | Type | A (mm) | B (mm) |
|---|---|---|---|
| 1 | 1.05.DY | 66 | 72 |
| 2 | 2.05.DY | 69 | 78 |
| 3 | 3.05.DY | 79 | 80 |
| 4 | 1310.05.DY | 68.5 | 99 |
| 5 | 100.05.DY | 70 | 109 |
| 6 | 25HP.05.DY | 69 | 78 |
| 7 | 50HP.05.DY | 70 | 109 |
SD-Double Joint (Welded / SDY)
| Series | Type | A (mm) | B (mm) |
|---|---|---|---|
| 1 | 1.05.SDY | 102 | 102 |
| 2 | 2.05.SDY | 102 | 102 |
| 3 | 3.05.SDY | 124 | 102 |
| 6 | 6.05.SDY | 146 | 102 |
| 7 | 7.05.SDY | 168 | 102 |
| 8 | 8.05.SDY | 168 | 102 |
| 32 | 32.05.SDY | 134 | 102 |
| 36 | 36.05.SDY | 154 | 102 |
| 42 | 42.05.SDY | 190 | 104 |
Key Features
Two opposed U-joints cancel out speed variation, delivering smooth, pulse-free torque to the implement.
DY (whole) for bolt-on replacement; SDY (welded) for permanent integration into custom shaft assemblies.
Shorter overall length than two separate U-joints with an intermediate shaft, saving driveline space.
From compact Series 1 to heavy-duty Series 42, covering the full spectrum of PTO shaft categories.
Smooth power delivery extends the life of bearings, gearboxes and implement drive components.
Dimensions follow international PTO shaft standards for seamless OEM replacement.
How It Works
A double joint consists of two universal joints connected by a short centring yoke. The geometry ensures that the non-uniform angular velocity produced by the first joint is exactly corrected by the second, resulting in constant-velocity output. This principle is the same used in automotive drive shafts but adapted here for the higher torques and lower speeds of PTO applications. The centring mechanism keeps both joints perfectly phased regardless of the operating angle.
Quality & Service
ISO 9001:2015 certified. CE compliant. 12-month warranty. Nationwide delivery. Email sales@australia-drive.com.
FAQ
When should I use a double joint instead of a wide angle joint?
Double joints are ideal for moderate angles (up to about 45°) where you want constant velocity without the cost of a dedicated CV joint. Wide angle joints are needed for angles above 45°.
What is the difference between DY and SDY?
DY (whole) joints are bolt-on assemblies for easy replacement. SDY (welded) joints are welded onto tube profiles for permanent custom shaft fabrication.
Are replacement bearing kits available?
Yes, cross-and-bearing kits for all series are stocked by GBC for fast replacement.
Customer Reviews
“Replaced a worn double joint on our PTO shaft with the 6.05.SDY. Perfect fit and vibration-free.”
“Great range of sizes. Found exactly the double joint we needed for our custom-built implement shaft.”
“Good quality double joint. Slightly longer delivery time than expected but the product is solid.”
“Second order from GBC for SD-Double Joints. Consistent quality and excellent customer service.”
“The 8.05.SDY was exactly what we needed for our heavy-duty slurry pump shaft. Strong build quality.”
Related Products
Explore the full GBC PTO driveline catalogue: contact us for shafts, torque limiters, yokes, shields, wide angle joints and adapters.
Order Your SD-Double Joint Today
Available in whole and welded configurations. Expert sizing advice and fast shipping across Australia.
Email: sales@australia-drive.com
