Air-Powered Hold-Down Fixture Clamps for Welding
Compact and lightweight, these clamps are easy to move and reposition when welding. Adjust the air pressure to quickly and consistently clamp or release parts. When pressure is applied, the arm on these clamps rotates 90° into position over your workpiece before clamping down. When pressure is released, the arm rises and rotates out of the way, so you can load or unload parts. They’re also known as swing clamps. Attach a sensor (not included) to activate relays and controllers. Connect their ports to a control valve and an air line. Use screws (not included) to mount the base to a flat surface.
All clamps come with a holding screw. Screws with a rubber tip are nonmarring, and their tip is removable.
Replacement clamping arms (sold separately) do not include a holding screw. Extended clamping arms (sold separately) give your clamp a longer reach than standard arms. However, you’ll have to use lower pressure, which means the actual clamping force will be lower than the clamp’s listed rating.
Add a clamping arm adapter (sold separately) to mount your own custom-machined arm.
Fixture Clamps | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Body | Holding Screw | Female Air Inlet and Outlet | Mount. Holes | Replacement Clamping Arms | Extended Clamping Arms | Clamping Arm Adapters | |||||||||||||||||||||
| Max. Clamping Clearance | Vertical Travel During Rotation | Max. Clamping Stroke | Holding Cap., lbs. | Reach | Wd. | Dp. | O'all Ht. | Thread Size | Tip Material | Pipe Size  | Thread Size | Thread Type | No of. | Dia. | Thread Size | Dp. | Location | Material | Each | Each | Lg. | Each | Each | ||||
90° Clockwise Rotation | |||||||||||||||||||||||||||
| 3 5/8" | 21/32" | 5/16" | 20 | 1 5/8" | 1 1/8" | 1 5/8" | 4" | M4 × 0.7 mm | Rubber | __ | M5 × 0.8 mm | Metric | 4 2 | __ | M5 × 0.8 mm M5 × 0.8 mm | — 9/16" | Side Base | Aluminum | 000000000 | 0000000 | 000000000 | 000000 | __ | 000000 | 00 | 000000000 | 000000 |
| 4 3/8" | 15/32" | 3/8" | 35 | 1 1/8" | 1 1/4" | 1 1/4" | 4 3/4" | 10-32 | Steel | __ | 10-32 | UNF | 4 2 | 3/16" 3/16" | __ | __ | Side Base | Aluminum | 00000000 | 000000 | 000000000 | 00000 | 2 7/8" | 000000000 | 000000 | 000000000 | 00000 |
| 4 7/8" | 1 3/16" | 9/16" | 100 | 2 9/16" | 2 3/16" | 2 3/4" | 5 5/8" | M8 × 1.25 mm | Rubber | 1/8 | __ | BSPP | 4 4 2 | __ | M8 × 1.25 mm M8 × 1.25 mm M8 × 1.25 mm | 3/4" 9/16" 9/16" | Base Side Side | Aluminum | 000000000 | 000000 | 000000000 | 00000 | __ | 000000 | 00 | 000000000 | 00000 |
| 5 1/2" | 3/4" | 1/2" | 130 | 2" | 2" | 3" | 6 3/8" | 3/8"-16 | Rubber | 1/8 | __ | NPT | 4 2 | 11/32" 11/32" | __ | __ | Side Base | Aluminum | 00000000 | 000000 | 000000000 | 00000 | 3 3/4" | 000000000 | 00000 | 000000000 | 00000 |
90° Counterclockwise Rotation | |||||||||||||||||||||||||||
| 3 5/8" | 21/32" | 5/16" | 20 | 1 5/8" | 1 1/8" | 1 5/8" | 4" | M4 × 0.7 mm | Rubber | __ | M5 × 0.8 mm | Metric | 4 2 | __ | M5 × 0.8 mm M5 × 0.8 mm | — 9/16" | Side Base | Aluminum | 000000000 | 000000 | 000000000 | 00000 | __ | 000000 | 00 | 000000000 | 00000 |
| 4 3/8" | 15/32" | 3/8" | 35 | 1 1/8" | 1 1/4" | 1 1/4" | 4 3/4" | 10-32 | Steel | __ | 10-32 | UNF | 4 2 | 3/16" 3/16" | __ | __ | Side Base | Aluminum | 00000000 | 000000 | 000000000 | 00000 | 2 7/8" | 000000000 | 00000 | 000000000 | 00000 |
| 4 7/8" | 1 3/16" | 9/16" | 100 | 2 9/16" | 2 3/16" | 2 3/4" | 5 5/8" | M8 × 1.25 mm | Rubber | 1/8 | __ | BSPP | 4 4 2 | __ | M8 × 1.25 mm M8 × 1.25 mm M8 × 1.25 mm | 3/4" 9/16" 9/16" | Base Side Side | Aluminum | 000000000 | 000000 | 000000000 | 00000 | __ | 000000 | 00 | 000000000 | 00000 |
| 5 1/2" | 3/4" | 1/2" | 130 | 2" | 2" | 3" | 6 3/8" | 3/8"-16 | Rubber | 1/8 | __ | NPT | 4 2 | 11/32" 11/32" | __ | __ | Side Base | Aluminum | 00000000 | 000000 | 000000000 | 00000 | 3 3/4" | 000000000 | 00000 | 000000000 | 00000 |
| For Max. Clamping Clearance | Includes | Each | |
| 4 3/8" | Rod Seal, Rod Wiper, End Cap Seal, Retaining Ring, Aluminum Piston with a Molded Seal and Groove with a Magnetic Ring | 000000000 | 000000 |
| 5 1/2" | Rod Seal, Rod Wiper, End Cap Seal, Retaining Ring, Aluminum Piston with a Molded Seal and Groove with a Magnetic Ring | 000000000 | 00000 |
Threaded Air-Powered Hold-Down Fixture Clamps for Welding
Screw these clamps directly into a tapped hole and use air pressure to quickly and consistently clamp and release parts when welding. Compact and lightweight, these clamps are easy to move and reposition when welding. They’re also known as swing clamps. Connect these clamps to a control valve and air line. When pressure is applied, the arm on these clamps rotates 90° into position over your workpiece before clamping down. When pressure is released, the arm rises and rotates out of the way, so you can load or unload parts.
Sensor-ready clamps activate relays and controllers when used with a sensor (not included).
Clamps with a rubber-tipped holding screw are nonmarring. Their tip is removable.
Replacement clamping arms do not include a holding screw. Extended clamping arms give your clamp a longer reach than standard arms. However, you’ll have to use lower pressure, which means the actual clamping force will be lower than the clamp’s listed rating.
Add a clamping arm adapter to mount your own custom-machined arm.
Use mounting blocks (sold separately) to hold clamps in an untapped hole.
Fixture Clamps | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Body | Holding Screw | Female Air Inlet and Outlet | Replacement Clamping Arms | Extended Clamping Arms | Clamping Arm Adapters | |||||||||||||||||||||
| Max. Clamping Clearance | Vertical Travel During Rotation | Max. Clamping Stroke | Holding Cap., lbs. | Reach | Thread Size | Thread Pitch, mm | Thread Lg. | Sensor Ready | O'all Ht. | Thread Size | Thread Pitch, mm | Tip Material | Pipe Size | Thread Size | Thread Pitch, mm | Thread Type | Material | Each | Each | Lg. | Each | Each | ||||
90° Clockwise Rotation | ||||||||||||||||||||||||||
| 4" | 1 3/32" | 17/32" | 35 | 1 15/16" | M40 | 1.5 | 1 11/16" | Not Sensor Ready | 4 5/8" | M6 | 1 | Rubber | __ | M5 | 0.8 | Metric | Aluminum | 0000000 | 0000000 | 0000000 | 000000 | __ | 000000 | 00 | 0000000 | 000000 |
| 4 3/8" | 15/32" | 3/8" | 35 | 1 1/8" | 1 1/8"-16 | __ | 2 7/8" | Sensor Ready | 4 3/4" | 10-32 | __ | Steel | __ | 10-32 | __ | UNF | Aluminum | 00000000 | 000000 | 000000000 | 00000 | 2 7/8" | 000000000 | 000000 | 000000000 | 00000 |
| 4 9/16" | 1 1/8" | 17/32" | 100 | 2 9/16" | M55 | 1.5 | 2 1/4" | Not Sensor Ready | 5 1/4" | M8 | 1.25 | Rubber | 1/8 | __ | __ | BSPP | Aluminum | 0000000 | 000000 | 000000000 | 00000 | __ | 000000 | 00 | 000000000 | 00000 |
| 5 5/16" | 3/4" | 1/2" | 95 | 1 5/8" | 1 3/4"-12 | __ | 3 1/4" | Sensor Ready | 6 1/8" | 3/8"-16 | __ | Rubber | 1/8 | __ | __ | NPT | Aluminum | 00000000 | 000000 | 000000000 | 00000 | __ | 000000 | 00 | 000000 | 00 |
90° Counterclockwise Rotation | ||||||||||||||||||||||||||
| 4" | 1 3/32" | 17/32" | 35 | 1 15/16" | M40 | 1.5 | 1 11/16" | Not Sensor Ready | 4 5/8" | M6 | 1 | Rubber | __ | M5 | 0.8 | Metric | Aluminum | 0000000 | 000000 | 0000000 | 00000 | __ | 000000 | 00 | 0000000 | 00000 |
| 4 3/8" | 15/32" | 3/8" | 35 | 1 1/8" | 1 1/8"-16 | __ | 2 7/8" | Sensor Ready | 4 3/4" | 10-32 | __ | Steel | __ | 10-32 | __ | UNF | Aluminum | 00000000 | 000000 | 000000000 | 00000 | 2 7/8" | 000000000 | 00000 | 000000000 | 00000 |
| 4 9/16" | 1 1/8" | 17/32" | 100 | 2 9/16" | M55 | 1.5 | 2 1/4" | Not Sensor Ready | 5 1/4" | M8 | 1.25 | Rubber | 1/8 | __ | __ | BSPP | Aluminum | 0000000 | 000000 | 000000000 | 00000 | __ | 000000 | 00 | 000000000 | 00000 |
| 5 5/16" | 3/4" | 1/2" | 95 | 1 5/8" | 1 3/4"-12 | __ | 3 1/4" | Sensor Ready | 6 1/8" | 3/8"-16 | __ | Rubber | 1/8 | __ | __ | NPT | Aluminum | 00000000 | 000000 | 000000000 | 00000 | __ | 000000 | 00 | 000000 | 00 |
| For Max. Clamping Clearance | Includes | Each | |
| 4 3/8" | Rod Seal, Rod Wiper, End Cap Seal, Retaining Ring, Aluminum Piston with a Molded Seal and Groove with a Magnetic Ring | 000000000 | 000000 |
| 5 5/16" | Rod Seal, Rod Wiper, End Cap Seal, Retaining Ring, Aluminum Piston with a Molded Seal and Groove with a Magnetic Ring | 0000000 | 000000 |
Hydraulic Hold-Down Fixture Clamps
Best for CNC milling, these clamps combine 10 times the force of air-powered clamps with automated swing action for fast, secure workholding. Their clamping arm (sold separately) rotates up and out of the way when not engaged, so you can easily insert and remove your workpiece.
Connect your hydraulic line to the back or the bottom of the clamp. All ports are sealed with an O-ring and a screw; unseal the port you want to use.
Single-acting clamps only use pressure to clamp down on a workpiece. When you release the pressure, a spring returns the clamping arm to its original position. They’re a good choice for simple setups, where you only need one or two clamps.
Double-acting clamps use pressure both to clamp and release a workpiece, giving you precise control over the process. They’re more efficient than single-acting clamps, since their release is quicker and more predictable. They’re a good choice if you need to coordinate the action of multiple clamps.
Choose a clamping arm best suited for your application. Machinable clamping arms let you customize the length and shape to suit your application. Because they are longer than standard arms, you’ll have to use lower pressure, and their actual clamping force will be lower than the listed rating.
Maximum clamping stroke is the vertical distance a clamping arm can travel to clamp a workpiece.
Clamps | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Body | Female Inlet and Outlet | Clamping Arms | Machinable Clamping Arms | |||||||||||||||
| Max. Clamping Clearance | Max. Clamping Stroke | O'all Ht. | Max. Clamping Force, lbs. | Wd. | Dp. | Thread Type | Thread Size | Mount. Fasteners Included | Material | Each | Lg. | Reach | Each | Lg. | Each | |||
Single Acting | ||||||||||||||||||
90° Clockwise Rotation | ||||||||||||||||||
| 4 9/16" | 3/8" | 5 5/16" | 1,100 | 2 1/4" | 2 1/8" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 0000000 | 2 3/8" | 1 9/16" | 00000000 | 0000000 | 5 13/16" | 00000000 | 0000000 |
| 5 9/16" | 1/2" | 6 3/4" | 2,400 | 2 7/8" | 2 5/8" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 000000 | 3 1/8" | 2" | 00000000 | 000000 | 7 1/16" | 00000000 | 000000 |
| 6 3/16" | 5/8" | 8 7/8" | 7,450 | 3 1/2" | 3 15/16" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 00000000 | 4 5/8" | 2 11/16" | 00000000 | 000000 | 8 1/2" | 00000000 | 000000 |
90° Counterclockwise Rotation | ||||||||||||||||||
| 4 9/16" | 3/8" | 5 5/16" | 1,100 | 2 1/4" | 2 1/8" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 000000 | 2 3/8" | 1 9/16" | 00000000 | 000000 | 5 13/16" | 00000000 | 000000 |
| 5 9/16" | 1/2" | 6 3/4" | 2,400 | 2 7/8" | 2 5/8" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 000000 | 3 1/8" | 2" | 00000000 | 000000 | 7 1/16" | 00000000 | 000000 |
| 6 3/16" | 5/8" | 8 7/8" | 7,450 | 3 1/2" | 3 15/16" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 00000000 | 4 5/8" | 2 11/16" | 00000000 | 000000 | 8 1/2" | 00000000 | 000000 |
Double Acting | ||||||||||||||||||
90° Clockwise Rotation | ||||||||||||||||||
| 4 9/16" | 3/8" | 5 5/16" | 1,250 | 2 1/4" | 2 1/8" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 000000 | 2 3/8" | 1 9/16" | 00000000 | 000000 | 5 13/16" | 00000000 | 000000 |
| 5 9/16" | 1/2" | 6 3/4" | 2,600 | 2 7/8" | 2 5/8" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 000000 | 3 1/8" | 2" | 00000000 | 000000 | 7 1/16" | 00000000 | 000000 |
| 6 3/16" | 5/8" | 7 3/4" | 7,600 | 3 1/2" | 3 15/16" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 00000000 | 4 5/8" | 2 11/16" | 00000000 | 000000 | 8 1/2" | 00000000 | 000000 |
90° Counterclockwise Rotation | ||||||||||||||||||
| 4 9/16" | 3/8" | 5 5/16" | 1,250 | 2 1/4" | 2 1/8" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 000000 | 2 3/8" | 1 9/16" | 00000000 | 000000 | 5 13/16" | 00000000 | 000000 |
| 5 9/16" | 1/2" | 6 3/4" | 2,600 | 2 7/8" | 2 5/8" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 000000 | 3 1/8" | 2" | 00000000 | 000000 | 7 1/16" | 00000000 | 000000 |
| 6 3/16" | 5/8" | 7 3/4" | 7,600 | 3 1/2" | 3 15/16" | UN/UNF (SAE Straight) | 7/16"-20 | Yes | Steel | 00000000 | 00000000 | 4 5/8" | 2 11/16" | 00000000 | 000000 | 8 1/2" | 00000000 | 000000 |