ABB IRB Process Wrist Modules 3HAC17327-1 / 3HAC037835-001 / 3HAC049629-001: IRB2400 / IRB660 / IRB6600 / IRB6650 / IRB1520ID / IRB1200

Technical Dossier

Product Details And Specifications

ABB IRB Process Wrist Series Technical Notes

The Evolution of ABB IRB Process Wrist Architecture

ABB's process wrist design has evolved across three distinct mechanical generations since the mid-1990s. The first generation, represented by part numbers such as 3HAC17327-1 (IRB2400 series), used a three-axis hollow-wrist design with integrated cable routing for process media — welding wire, air lines, and signal cables — passing through the wrist body. This architecture reduced external cable wear and enabled tighter path repeatability in arc welding applications.

The second generation introduced modular gear cartridge replacement, reducing mean time to repair (MTTR). Part numbers such as 3HAC037835-001 (IRB660 / IRB6600 / IRB6650) reflect this design philosophy, with standardized bolt patterns allowing field replacement without full arm disassembly. Compatibility between IRB6600 and IRB6650 wrist assemblies was maintained at the mechanical interface level, simplifying multi-robot fleet maintenance.

The third generation, exemplified by 3HAC049629-001 (IRB1520ID / IRB1200), integrates the Integrated Dressing (ID) concept — all process cables and hoses are fully routed inside the upper arm and wrist, eliminating external dressing entirely. This design is standard on collaborative and compact robot platforms where cable interference with workpieces is unacceptable. Backward compatibility with first-generation wrist interfaces does not exist; mounting flange dimensions and gear ratios differ across generations.

ABB IRB Process Wrist Full Catalog & Functionalities (SKU List)

The following SKUs represent verified part numbers within the ABB IRB process wrist and associated wrist-axis mechanical component range. Each entry reflects a distinct assembly or sub-assembly with a defined robot platform scope.

3HAC17327-1: Complete process wrist assembly for IRB2400/10 and IRB2400/16; hollow-wrist design for arc welding dressing.
3HAC037835-001: Process wrist unit for IRB660, IRB6600, and IRB6650; modular gear cartridge; payload class 125–235 kg.
3HAC049629-001: Integrated dressing wrist for IRB1520ID and IRB1200; full internal cable routing; compact footprint.
3HAC026253-001: Wrist axis 4 gearbox for IRB6600/IRB6650; input shaft assembly included.
3HAC026254-001: Wrist axis 5 gearbox for IRB6600/IRB6650; bevel gear stage; grease-lubricated.
3HAC026255-001: Wrist axis 6 gearbox for IRB6600/IRB6650; output flange ISO 9283 standard.
3HAC14550-2: Wrist complete assembly for IRB2400 early production; superseded by 3HAC17327-1 in later builds.
3HAC025338-001: Axis 4 motor bracket and wrist housing for IRB660; structural casting.
3HAC031683-001: Wrist sealing kit for IRB6600/IRB6650; IP67-rated gaskets and O-rings.
3HAC044168-001: Process wrist for IRB4600; axis 4–6 integrated assembly; 45 kg payload class.
3HAC057546-001: Wrist assembly for IRB6700; updated gear geometry; compatible with IRB6700-150/3.2 and IRB6700-200/2.6.
3HAC028357-001: Axis 6 output flange for IRB2400; ISO 9283 tool mounting interface.
3HAC032104-001: Wrist cover and cable guide for IRB1200; injection-molded polymer housing.
3HAC046686-001: Wrist harness assembly for IRB1520ID; integrated signal and power cable loom.
3HAC050363-001: Axis 5 gear unit for IRB1200; compact harmonic drive stage; grease-filled sealed unit.
3HAC020812-001: Wrist rebuild kit for IRB2400; includes bearings, seals, and shims for full overhaul.

Sourcing Hard-to-Find & Obsolete ABB IRB Process Wrist Parts

Several wrist assemblies in the IRB2400 and early IRB6600 range have reached end-of-production status at ABB's factory. Part numbers including 3HAC14550-2 and 3HAC17327-1 (early production batches) are no longer manufactured as new units. DriveKNMS maintains a dedicated inventory of tested surplus and refurbished wrist assemblies sourced from decommissioned robot lines, controlled dismantling programs, and authorized redistribution channels.

Quality Control for the ABB IRB Process Wrist Range

ABB process wrist assemblies present specific test challenges due to their multi-axis gear train, internal cable routing, and precision bearing preload requirements. DriveKNMS applies the following verification protocol to all wrist units prior to dispatch:

Backlash measurement: Axes 4, 5, and 6 are tested individually using a calibrated dial indicator fixture. Backlash values are compared against ABB's published tolerance tables for each robot model and payload class. Units exceeding tolerance are rejected or rebuilt.
Torque and drag test: Each axis is driven through its full range of motion under no-load conditions. Abnormal drag, binding, or torque spikes indicate bearing damage or gear contamination and trigger disassembly inspection.
Seal integrity check: Wrist housings are pressure-tested at 0.5 bar to verify IP67 sealing on all cable entry points and gear housing joints. Failed seals are replaced with OEM-specification gaskets.
Cable continuity verification: For integrated dressing wrist units (3HAC049629-001 and similar), all internal signal and power conductors are tested for continuity and insulation resistance before reassembly.
Dimensional inspection: Output flange flatness and tool mounting hole position are verified against ISO 9283 tolerances using a coordinate measuring machine (CMM).