Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 421-1-10479-390 |
| Manufacturer | ABB Robotics (ABB AB, Robotics & Discrete Automation) |
| Product Type | Complete Output Shaft Configuration / Wrist Axis Mechanical Sub-Assembly Kit |
| Assembly Type | Overhaul-level mechanical kit (not a consumable or single shaft) |
| Compatible Robot Families | IRB 6600, IRB 6650, selected IRB 7600 variants (verify gearbox type) |
| Typical Axis Position | Axis 4, 5 or 6 of the robot wrist — exact position confirmed by S/N |
| Kit Contents | Output flange shaft, preloaded angular-contact bearings, radial lip seals, sun gear, adjusting shims, circlips, fasteners |
| Shaft Material | Case-hardened chromium alloy steel, carburised or induction-hardened, precision ground (Ra ≤ 0.8 µm) |
| Bearing Type | Precision angular-contact ball bearings, matched duplex pair, ABEC-3 / P6 grade or better |
| Sealing | FKM (Viton) or NBR radial shaft seal(s) with secondary sealing for grease retention |
| Lubrication | Factory pre-filled with ABB-specified robot gearbox grease |
| Typical Repeatability | ±0.05 mm to ±0.1 mm on IRB 6600 series (model, axis and calibration dependent) |
| Assembly Weight | Approximately 8–18 kg depending on revision and axis position |
| Operating Environment | Robot wrist joint; -10 °C to +60 °C ambient, internal gearbox up to +90 °C intermittent |
| Spare Part Level | Level-3 Service / Overhaul Part |
| Matching Requirement | Must be verified against full robot model, serial number (S/N) and gearbox revision |
Main Features and Advantages
Factory-matched tolerances and preload calibration: The central engineering value of the ABB 421-1-10479-390 is that the difficult adjustments are completed before the kit ever reaches the workshop. Bearing preload, gear mesh clearance and seal compression are all set during assembly at ABB under controlled conditions, so the kit arrives as a calibrated unit rather than a collection of parts whose final accuracy depends entirely on the skill of the fitter. This removes the tolerance stack-up that is the usual cause of post-overhaul wrist noise, grease weeping and premature bearing failure, converting an uncertain repair into a predictable, repeatable outcome.
Pre-lubricated and sealed for extended service life: The complete assembly ships pre-filled with the exact grease ABB specifies for that joint, in the correct quantity. Correct lubrication fill is one of the easiest parameters to get wrong in the field, since both under-greasing and over-greasing shorten bearing life. Combined with the radial shaft seals, the ABB 421-1-10479-390 is protected against both grease loss and the ingress of dust, swarf and coolant mist that contaminate gearboxes in foundry, machining and welding cells.
Case-hardened shaft for high moment loads: The output flange shaft is manufactured from case-hardened alloy steel, hardened and then ground to finished size, giving it the strength and dimensional stability needed to carry payload moments and reaction forces during high-speed reorientation. This directly preserves the stiffness of the joint and limits backlash growth over the course of the rebuild interval.
Drop-in replacement minimising downtime: Because the ABB 421-1-10479-390 is supplied as a pre-assembled, pre-adjusted and pre-lubricated module, the variables that previously caused comebacks — bearing preload and component matching — are no longer dependent on workshop conditions. For production managers, this means a wrist that is slowly degrading can be returned to its original positional accuracy during a single scheduled shutdown, with a predictable service interval extension of 40% or more.
