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Collet Fixtures
Lever Actuator
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Lever fixtures have a handle that can be indexed to any position—no tools required. They’re often used for quickly swapping workpieces in and out, when a simple clamping mechanism is more important than consistent holding force. These fixtures keep the collet stationary while their sleeve clamps. Made from cast iron, they dampen vibration better than steel fixtures, though they’re less durable.
Mounting Slots | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Collet Type | For Max. Workpiece Dia. | Through-Hole Dia. | Lg. | Wd. | Ht. | Material | No. of | Wd. | Mounting Position | Power Source | Each | ||
| 5C | 1 1/16" | 1 1/16" | 3 3/4" | 5" | 4" | Enamel-Coated Cast Iron | 4 | 11/16" | Horizontal, Vertical | Manual | 3174A42 | 0000000 | |
Collet Nut Actuator
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Collet nut fixtures convert ER collets—typically used to hold tool bits—into holders for cylindrical workpieces. The tapered, slit design of the collet distributes clamping force evenly around a workpiece. This creates a stable, consistent grip that keeps your workpiece from shifting, even under 5-axis machining forces. These fixtures are made of steel to withstand the high clamping forces and frequent cycles of production environments.
Mounting Holes | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Collet Type | For Max. Workpiece Dia. | Through-Hole Dia. | Dia. | Ht. | Material | No. of | Dia. | Bolt Circle Dia. | Mounting Position | Power Source | Each | ||
| ER-16 | 3/8" | 7/16" | 2 3/4" | 2 1/2" | Black-Oxide Steel | 4 | 1/4" | 2 1/8" | Horizontal, Vertical | Manual | 3174A34 | 0000000 | |
| ER-20 | 1/2" | 7/16" | 2 3/4" | 2 1/2" | Black-Oxide Steel | 4 | 1/4" | 2 1/8" | Horizontal, Vertical | Manual | 3174A35 | 000000 | |
| ER-25 | 5/8" | 7/16" | 2 3/4" | 2 1/2" | Black-Oxide Steel | 4 | 1/4" | 2 1/8" | Horizontal, Vertical | Manual | 3174A36 | 000000 | |
| ER-25 | 5/8" | 11/16" | 5" | 3" | Black-Oxide Steel | 4 | 7/16" | 4" | Horizontal, Vertical | Manual | 3174A37 | 000000 | |
| ER-32 | 13/16" | 11/16" | 5" | 3" | Black-Oxide Steel | 4 | 7/16" | 4" | Horizontal, Vertical | Manual | 3174A38 | 000000 | |
| ER-40 | 1" | 11/16" | 5" | 3" | Black-Oxide Steel | 4 | 7/16" | 4" | Horizontal, Vertical | Manual | 3174A39 | 000000 | |
Square Drive Actuator
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Square-drive fixtures are designed for precise, repeatable workholding with consistent clamping force. They keep the collet stationary while their sleeve clamps. Made of steel, these fixtures are stronger and more wear resistant than cast iron fixtures, and they can hold up to higher clamping forces. They’re precision machined for accuracy. Use the included socket wrench to clamp and unclamp your workpiece or use a calibrated torque wrench to fine-tune the clamping force.
Mounting Holes | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Collet Type | For Max. Workpiece Dia. | Through-Hole Dia. | Dia. | Ht. | Material | No. of | Dia. | Bolt Circle Dia. | Mounting Position | Power Source | Includes | Each | ||
| 5C | 1 1/16" | 1 3/16" | 5" | 3 1/2" | Black-Oxide Steel | 6 | 3/8" | 4 1/8" | Horizontal, Vertical | Manual | Socket Wrench | 3174A31 | 000000000 | |
| 16C | 1 5/8" | 1 13/16" | 5" | 4 1/2" | Black-Oxide Steel | 6 | 3/8" | 4 1/8" | Horizontal, Vertical | Manual | Socket Wrench | 3174A32 | 00000000 | |
| 3J | 1 3/4" | 1 15/16" | 5" | 4" | Black-Oxide Steel | 6 | 3/8" | 4 1/8" | Horizontal, Vertical | Manual | Socket Wrench | 3174A33 | 00000000 | |
High-Density Air/Hydraulic-Operated Collet Fixtures
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Four Fixtures (Each Sold Separately) |
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Pull Back | Pull Back—Flange Mount |
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Fixed Length | Fixed Length—Flange Mount |
Push a button to clamp or release multiple workpieces on your milling machine or drill press. To create a high-density setup, mount these fixtures and join them together using two connector bushings (sold separately) for each fixture you want to add. These fixtures have a through hole for clamping long workpieces.
Air or hydraulic pressure opens and closes the collets (not included). A good choice for heavy machining, these fixtures provide a tighter hold than you can achieve with manual power. You can operate multiple fixtures with a single valve (not included) and two hoses—one for supply and one for return. All are double acting, so they need air or hydraulic pressure both to open and close. This means that the workpiece stays locked in place even if you lose pressure. Clamping force depends on the air or hydraulic pressure of your system.
Top-Locking Screw—Fixtures with a top-locking screw allow for direct access to make adjustments without disassembling your setup.
Pull Back—Pull-back fixtures have tapered walls that press all sides of the collet evenly to center the workpiece—like how a mechanical pencil grips lead. They’re less precise than fixed-length fixtures because the workpiece may shift slightly during clamping.
Fixed Length—Fixed-length fixtures, also known as dead-length fixtures, keep the collet stationary while they clamp onto a workpiece. Use them to precisely machine holes, slots, and contours exactly where you need them. Since these fixtures position workpieces consistently, they’re often used for high-volume production runs. You can also rotate them on an indexer or rotary table without losing your reference point.
Collet Fixtures | Connectors | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Max. Pressure, psi | Max. Clamping Force, psi | Mounting Holes | Mounting Slots | Port | ||||||||||||||||||||||
For Collet Type | For No. of Collets | For Max. Workpiece Dia. | Through-Hole Dia. | Lg. | Wd. | Ht. | Air | Hydraulic | Air-Powered | Hydraulic-Powered | Material | No. of | Thread Size | Dia. | Lg. | Wd. | No. of | Pipe Size | Thread Type | Includes | Each | Each | ||||
Collet Fixtures with Locking Screw | ||||||||||||||||||||||||||
Pull Back | ||||||||||||||||||||||||||
| 5C | 1 | 1 1/16" | 1 3/16" | 4" | 4" | 3 1/2" | 150 | — | 1,125 | — | Aluminum | 4 | 3/8"-24 | — | — | — | 2 | 1/4 | NPT | Collet Wrench | 3115N13 | 0000000 | 3115N12 | 000000 | ||
Pull Back—Flange Mount | ||||||||||||||||||||||||||
| 5C | 1 | 1 1/16" | 1 3/16" | 6 1/2" | 4" | 3 1/2" | 150 | — | 1,125 | — | Aluminum | 4 | 3/8"-24 | — | 1" | 1/2" | 2 | 1/4 | NPT | Collet Wrench | 3115N14 | 000000 | 3115N12 | 00000 | ||
Collet Fixtures with Top-Locking Screw | ||||||||||||||||||||||||||
Fixed Length | ||||||||||||||||||||||||||
| 1C | 1 | 1/4" | 5/16" | 1 3/4" | 1 3/4" | 1 7/16" | 250 | 750 | 180 | 545 | Aluminum | 4 | 10-24 | — | — | — | 2 | 1/8 | NPT | Collet Wrench | 3115N15 | 000000 | 3115N21 | 00000 | ||
| 3C | 1 | 1/2" | 5/8" | 2 1/2" | 2 1/2" | 2 3/4" | 250 | 750 | 300 | 900 | Aluminum | 4 | 1/4"-20 | — | — | — | 2 | 1/8 | NPT | Collet Wrench | 3115N16 | 000000 | 3115N22 | 00000 | ||
| 5C | 1 | 1 1/16" | 1 3/16" | 4" | 4" | 3 5/16" | 150 | 400 | 3,825 | 19,125 | Aluminum | 4 | 3/8"-16 | — | — | — | 2 | 1/4 | NPT | Collet Wrench | 3115N11 | 000000 | 3115N12 | 00000 | ||
| 5C | 3 | 1 1/16" | 1 3/16" | 8" | 3 1/2" | 3 5/16" | — | 5,000 | — | 5,500 | Aluminum | 4 | 5/16"-18 | — | — | — | 2 | 7/16 | UNF | Collet Wrench | 3115N18 | 00000000 | 3115N12 | 00000 | ||
| 16C | 1 | 1 5/8" | 1 7/8" | 4" | 4" | 4 1/4" | 250 | 2,000 | 1,450 | 11,600 | Aluminum | 4 | 3/8"-16 | — | — | — | 2 | 1/4 | NPT | Collet Wrench | 3115N17 | 000000 | 3115N12 | 00000 | ||
Fixed Length—Flange Mount | ||||||||||||||||||||||||||
| 3J | 1 | 1 3/4" | 1 15/16" | 4" | 4" | 3 3/4" | — | 5,000 | — | 9,500 | Steel | 4 | — | 3/8" | — | — | 2 | 7/16 | UNF | Collet Wrench | 3115N19 | 00000000 | 3115N12 | 00000 | ||
