Circular Air-Powered Grippers
Lift and move round parts such as cylinders. For extra stability, these grippers have three jaws that slide toward the center instead of two. They’re double acting, which means they use air pressure to open and close the jaws for consistent gripping force in either direction. This lets you grab parts from the outside or open the jaws inside hollow parts to grab them when the outside is hard to grip. You’ll need gripper fingers (not included).
Closing force and opening force describe how hard the gripper can squeeze your part at the fingertips, also called the gripping distance. The less friction there is between the part and fingers, the more force you’ll need to lift a part. Typically, you’ll need a force that’s about 10 times the part’s weight, but an oily part might need a force about 20 times its weight. However, air pressure and finger length also affect the ideal force. Click on a part number and select “Product Detail” to view a chart that shows how closing or opening force changes as the gripping distance changes.
Jaw spacing diameter describes the distance between the jaws when fully closed and fully open. It’s measured from the inside surface of the jaws.




Closing Force @ Gripping Distance | Opening Force @ Gripping Distance | Overall | Air Inlet | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max. | Min. | Max. | Min. | Jaw Spacing Dia., mm | Operating Pressure, psi | Dia., mm | Lg., mm | Pipe Size | Thread Size | Thread Type | Manufacturer (Series/Model No.) | Each | |
| 4 lbs. @ 5 mm | 0.89 lbs. @ 30 mm | 4.9 lbs. @ 5 mm | 0.89 lbs. @ 30 mm | 10-14 | 30-87 | 30 | 35 | __ | M3 × 0.5 mm | Metric | SMC (MHS3 16D) | 6743K11 | 0000000 |
| 8 lbs. @ 5 mm | 1.7 lbs. @ 35 mm | 9.4 lbs. @ 5 mm | 2 lbs. @ 35 mm | 12-16 | 30-87 | 36 | 38 | __ | M5 × 0.8 mm | Metric | SMC (MHS3 20D) | 6743K12 | 000000 |
| 13.4 lbs. @ 5 mm | 2.6 lbs. @ 40 mm | 14.8 lbs. @ 5 mm | 3.5 lbs. @ 40 mm | 14-20 | 30-87 | 42 | 40 | __ | M5 × 0.8 mm | Metric | SMC (MHS3 25D) | 6743K13 | 000000 |
| 21.5 lbs. @ 10 mm | 3.5 lbs. @ 45 mm | 24.2 lbs. @ 10 mm | 3.5 lbs. @ 45 mm | 16-24 | 15-87 | 52 | 44 | __ | M5 × 0.8 mm | Metric | SMC (MHS3 32D) | 9223N11 | 000000 |
| 35 lbs. @ 10 mm | 4.4 lbs. @ 50 mm | 40 lbs. @ 10 mm | 4.4 lbs. @ 50 mm | 20-28 | 15-87 | 62 | 47 | __ | M5 × 0.8 mm | Metric | SMC (MHS3 40D) | 9223N12 | 000000 |
| 56 lbs. @ 10 mm | 8.9 lbs. @ 60 mm | 61 lbs. @ 10 mm | 8.9 lbs. @ 60 mm | 22-34 | 15-87 | 70 | 55 | __ | M5 × 0.8 mm | Metric | SMC (MHS3 50D) | 9223N13 | 000000 |
| 62 lbs. @ 10 mm | 40 lbs. @ 50 mm | 67 lbs. @ 10 mm | 40 lbs. @ 50 mm | 16-21 | 30-116 | 56 | 27 | __ | M3 × 0.5 mm | Metric | Schunk (JGZ 40) | 7067N47 | 000000 |
| 80 lbs. @ 10 mm | 49 lbs. @ 60 mm | 89 lbs. @ 10 mm | 53 lbs. @ 60 mm | 20-28 | 30-116 | 72 | 34 | __ | M5 × 0.8 mm | Metric | Schunk (JGZ 50) | 7067N48 | 000000 |
| 94 lbs. @ 20 mm | 13.4 lbs. @ 70 mm | 100 lbs. @ 20 mm | 16.8 lbs. @ 70 mm | 30-46 | 15-87 | 86 | 66 | __ | M5 × 0.8 mm | Metric | SMC (MHS3 63D) | 9223N14 | 000000 |
| 130 lbs. @ 20 mm | 100 lbs. @ 80 mm | 145 lbs. @ 20 mm | 110 lbs. @ 80 mm | 20-32 | 30-116 | 87 | 43 | __ | M5 × 0.8 mm | Metric | Schunk (JGZ 64) | 7067N49 | 000000 |
| 145 lbs. @ 20 mm | 17.9 lbs. @ 80 mm | 150 lbs. @ 20 mm | 20.2 lbs. @ 80 mm | 43-63 | 15-87 | 106 | 82 | 1/8 | __ | BSPP | SMC (MHS3 80D) | 9223N15 | 000000 |
| 220 lbs. @ 20 mm | 165 lbs. @ 100 mm | 245 lbs. @ 20 mm | 155 lbs. @ 100 mm | 26-42 | 30-116 | 111 | 49 | __ | M5 × 0.8 mm | Metric | Schunk (JGZ 80) | 7067N51 | 000000 |
| 470 lbs. @ 20 mm | 220 lbs. @ 125 mm | 445 lbs. @ 20 mm | 310 lbs. @ 125 mm | 32-52 | 30-116 | 135 | 59 | 1/8 | __ | BSPP | Schunk (JGZ 100) | 7067N52 | 000000 |
| 710 lbs. @ 20 mm | 400 lbs. @ 160 mm | 760 lbs. @ 20 mm | 355 lbs. @ 160 mm | 40-66 | 30-116 | 166 | 67 | 1/8 | __ | BSPP | Schunk (JGZ 125) | 7067N53 | 00000000 |
| 1,460 lbs. @ 20 mm | 670 lbs. @ 200 mm | 1,570 lbs. @ 20 mm | 670 lbs. @ 200 mm | 50-82 | 30-116 | 212 | 81 | 1/8 | __ | BSPP | Schunk (JGZ 160) | 7067N54 | 00000000 |

These sensors detect when the jaws reach positions—such as fully open—so your system can trigger actions such as a new pick cycle. They slide into the grooves of the gripper body.
Sensors with two sensing positions let you check more than one condition in a cycle for more reliable feedback. For example, if the sensor detects the jaws have moved past a certain position but aren’t fully closed, it may indicate the gripper missed picking up a part and signal the robot to try the pick again.
| Signal Output Type | Connection Type | No. of Wire Leads | No. of Sensing Positions | Switch Starting Position | Voltage | Current, mA | Cord Lg., ft. | Manufacturer (Series/Model No.) | Each | |
For SMC Grippers | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| NPN | 3-Pole Nano M8 | __ | 1 | 1 Off (Normally Open) | 24V DC | 10 | 1 1/2 | SMC (D-M9NSAPC) | 9533N24 | 000000 |
| NPN | 4-Pole Micro M12 | __ | 1 | 1 Off (Normally Open) | 24V DC | 10 | 3 | SMC (D-M9NMDPC) | 9533N22 | 00000 |
| NPN | Wire Leads | 3 | 1 | 1 Off (Normally Open) | 24V DC | 10 | 3 | SMC (D-M9NM) | 9533N19 | 00000 |
| PNP | 3-Pole Nano M8 | __ | 1 | 1 Off (Normally Open) | 24V DC | 10 | 1 1/2 | SMC (D-M9PSAPC) | 9533N25 | 00000 |
| PNP | 4-Pole Micro M12 | __ | 1 | 1 Off (Normally Open) | 24V DC | 10 | 3 | SMC (D-M9PMDPC) | 9533N23 | 00000 |
| PNP | Wire Leads | 3 | 1 | 1 Off (Normally Open) | 24V DC | 10 | 3 | SMC (D-M9PM) | 9533N21 | 00000 |
For Schunk Grippers | ||||||||||
| NPN | 3-Pole Nano M8 | __ | 1 | 1 Off (Normally Open) | 24V DC | 50 | 1 | Schunk (MMS 22‐S‐M8‐NPN) | 7705N141 | 000000 |
| NPN | Wire Leads | 3 | 1 | 1 Off (Normally Open) | 24V DC | 50 | 6 1/2 | Schunk (MMSK 22-S-NPN) | 7705N143 | 000000 |
| PNP | 3-Pole Nano M8 | __ | 1 | 1 Off (Normally Open) | 24V DC | 50 | 1 | Schunk (MMS 22-S-M8-PNP) | 7705N14 | 00000 |
| PNP | 4-Pole Nano M8 | __ | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | 24V DC | 100 | 2 | Schunk (MMS-P 22-S-M8-PNP) | 7705N148 | 000000 |
| PNP | Wire Leads | 3 | 1 | 1 Off (Normally Open) | 24V DC | 50 | 6 1/2 | Schunk (MMSK 22-S-PNP) | 7705N142 | 00000 |
| PNP | Wire Leads | 4 | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | 24V DC | 100 | 6 1/2 | Schunk (MMSK-P 22-S-PNP) | 7705N149 | 000000 |


Increase the range of part sizes your gripper can handle. Each set of adapters has a jaw mount and a positioning slide that moves along a rail. Connect your fingers to the slides, use the scale on the rail to precisely position them, and tighten the thumb screws to secure them in place.
Keep multiple sets of positioning slides (sold separately) on hand to speed up your gripper finger changes.
| For Manufacturer (Series/Model No.) | Positioning Slide Adjustment Wd., mm | Adjustment Increments, mm | Lg., mm | Wd., mm | Ht., mm | Mounting Hardware Included | Wt. | Manufacturer (Series/Model No.) | Pkg. Qty. | Pkg. | |
Nonremovable Positioning Slide | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Schunk (JGZ 64) | 33 | 1.5 | 64 | 36 | 36 | Yes | 0.73 lbs. / 0.33 kg | Schunk (UZB 64) | 3 | 9223N22 | 000000000 |
Removable Positioning Slide | |||||||||||
| Schunk (JGZ 80) | 44 | 2 | 79 | 42 | 40 | Yes | 1.12 lbs. / 0.51 kg | Schunk (UZB 80) | 3 | 9223N33 | 00000000 |
| Schunk (JGZ 100) | 55 | 2.5 | 97 | 47 | 46 | Yes | 1.72 lbs. / 0.78 kg | Schunk (UZB 100) | 3 | 9223N44 | 00000000 |
| Schunk (JGZ 125) | 72 | 3 | 113 | 52 | 49 | Yes | 2.31 lbs. / 1.05 kg | Schunk (UZB 125) | 3 | 9223N55 | 00000000 |


When you need to frequently swap your gripper fingers for different jobs, attach these slides to each of your finger sets to speed up the process. You’ll also need an adjustable finger mounting adapter (sold separately).

























