Industrial Robot End Effectors and Grippers Guide

Start With the Part, Not the Gripper Catalog

Industrial robot end effectors and grippers are the interface between a reprogrammable arm and a real part. The part itself — its weight, surface, geometry, tolerance, and how it presents — decides the gripper class. The International Federation of Robotics defines the industrial robot as a reprogrammable multipurpose manipulator, and the gripper is what makes that definition useful on your specific SKU.

The four common end-of-arm-tool (EOAT) classes are pneumatic parallel grippers, servo-electric adaptive grippers such as the Robotiq 2F-85, 2F-140, and 3-Finger line, vacuum systems from vendors like Piab and SMC, and magnetic grippers for ferrous parts. Welding cells add a torch package such as a Fronius or Abicor Binzel unit.

The Bot Scout rule is: describe the part in one line — material, mass, contact surfaces, orientation as presented — before opening any vendor page. Half of returned EOATs are grippers bought against a generic part description that the actual line never produced.

Pneumatic Parallel Grippers: Cheapest per Cycle, Fussy About Air

Pneumatic parallel grippers dominate high-volume industrial cells because they are cheap, fast, and mechanically simple. SMC, Schunk, and Festo each publish full catalogs with force, stroke, mass, and repeatability figures pulled from the datasheet — always work from the datasheet, not a distributor page.

The failure mode is boring: dirty or wet compressed air shortens seal life, and a single-force setting means the gripper cannot distinguish a good part from a jammed one. If the line runs mixed SKUs or the part is fragile, the calculus shifts toward an electric adaptive gripper even though the per-unit price is higher.

Pneumatic remains the default for machine tending on stamped or machined parts where cycle time is under two seconds and the part presentation is fixed. It is the wrong default for cobot cells because it adds an air drop, a solenoid, and a valve manifold to what was supposed to be a single-cable installation.

Adaptive Electric Grippers: Robotiq, OnRobot, and Schunk

Servo-electric adaptive grippers replaced pneumatics in most cobot and mixed-SKU cells because they carry their own controller, expose force and position over a single cable, and mount as a plug-in on Universal Robots, FANUC CRX, and other cobot arms. Robotiq lists the 2F-85 at 5 kg payload and 85 mm stroke and the 2F-140 at 2.5 kg and 140 mm.

OnRobot markets the RG2 at 2 kg payload with 100 mm stroke and the RG6 at 6 kg with 160 mm, and Schunk EGK and EGH extend the same idea to heavier industrial payloads. Published prices are rare in this segment — most vendors quote through integrators, so treat online figures as list guidance rather than confirmed transaction prices.

Force control is the real reason to spend the extra money. An adaptive gripper can pick a bagged pouch and a rigid casting on the same cycle without a tool change, which is what actually collapses changeover time on a mixed line.

Vacuum, Magnetic, and Welding End Effectors

Vacuum EOAT dominates palletizing, case handling, and sheet-metal loading. Piab sells the piCOBOT electric-vacuum unit as a cobot-native plug-in, Schmalz supplies the ECBPi and FXCB cobot ranges, and OnRobot VG10 and VGC10 offer configurable cup arrays. Porous cardboard, oily sheet, and irregular texture are the usual reasons a vacuum tool that worked in the demo does not work on the line.

Magnetic grippers matter only when the part is reliably ferrous. Goudsmit MagSystems and similar vendors publish holding-force curves that must be derated for surface finish, air gap, and part thickness. Residual magnetism on the part is the failure that catches new integrators.

Welding torches are their own EOAT category. Fronius Robacta, Abicor Binzel iROB, and Miller AutoAxcess packages include the torch, wire feeder interface, and anti-collision mount as a system — cable dress and tool-center-point (TCP) drift consume more integration hours than the torch selection itself.

• Test the vacuum tool on the worst carton or sheet you actually run, not a clean sample.
• Confirm the cobot controller can drive the EOAT electrically before assuming a plug-in install.
• For magnetic grippers, derate holding force for surface finish and air gap from the vendor curve.
• For welding torches, plan cable dress and anti-collision before choosing the torch model.
• Log air, power, and communication drops per tool so a tool changer can inherit them cleanly.

Industrial Robot Tool Changers: ATI and Schunk

When a cell needs more than one EOAT, an industrial robot tool changer replaces manual swap-out. ATI Industrial Automation and Schunk SWS are the reference vendors, with payload classes from a few kilograms up to hundreds of kilograms and standard modules for pneumatic, electrical, and fieldbus pass-through.

The selection question is not brand — it is payload, moment, required signals, and mating cycles. A changer sized only to the tool weight ignores the moment that a long vacuum array creates at the flange, and a changer without the right fieldbus module forces a control redesign later.

Tool changers pay for themselves when the cell runs at least two tools per shift or one tool that needs regular service off the arm. They rarely pay off in single-tool cells no matter how cheap the mechanical coupling is.