Airtac SEJ Adjustable Cylinder SEJ80X75-30S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ80X75-30S is a genuine double-acting ISO 15552 double-rod cylinder with a mechanically ADJUSTABLE stroke: a back-rod stop screw lets you fine-tune the retract end over a 30mm window, so this Ø80mm unit covers an effective stroke of 45–75mm without changing cylinders. Force is equal in both directions.
- BoreØ80 mm
- Nominal stroke75 mm
- Adjust window30 mm
- Effective stroke45–75 mm
- Port sizePT3/8
- CushionAdjustable, 36 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SEJ Adjustable Cylinder SEJ80X75-30S
The AirTAC SEJ80X75-30S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 30 mm mechanical stroke adjustment window. A stop screw on the rear rod lets you dial the retract end position down, yielding an effective stroke range of 45 to 75 mm without swapping hardware. Because a rod exits both ends, the annular area is symmetrical, delivering an equal 2268 N of force each way at 0.5 MPa (3175 N at 0.7 MPa).
This 80 mm bore unit runs on PT3/8 ports and uses a Ø25 mm rod with an M20x1.5 thread. The extruded aluminum barrel omits external tie rods for a clean profile. It includes a standard magnet (-S) for position sensing and features field-adjustable air cushions at both ends to decelerate the load smoothly near stroke end.
Airtac SEJ Adjustable Cylinder SEJ80X75-30S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ80X75-30S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 30 mm (45–75 mm) |
| Configuration | Double rod, double acting |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C (0–150 °C with FKM seals) |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 36 mm |
Specifications follow the official AirTAC SEJ datasheet and ISO 15552 / VDMA 24562 dimensions. The adjustment screw shortens the retract end only; do not exceed the 30mm window. Port options: PT (standard) / G (BSPP).
Theoretical Output Force (Ø80mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 2268 N |
| 0.7 MPa | 3175 N |
| Max (@1.0 MPa) | 463 kgf |
A rod exits both ends, so extend and retract force are identical. Actual usable force is lower than theoretical; size with a safety margin.
Model Code: Airtac SEJ Adjustable Cylinder SEJ80X75-30S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 80 | Bore size in mm. |
| ×75 | Nominal stroke length in mm. |
| -30 | Adjustment stroke window in mm (options: 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for CMSE / DMSE sensor sensing. |
Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B). Seals: TPU (blank) / FKM high-temp (H) / NBR (N). Thread: PT (blank) / G. Mounting (SEJ): Basic, LB, FA, TC, FTC, TCM1, TCM2. Related: SED (double rod, fixed stroke), SE (single rod).
Where the Airtac SEJ Adjustable Cylinder SEJ80X75-30S Is Used
Press Feed Fine-Tuning
Dial in the exact 45-75 mm material push during stamping press commissioning. The 3175 N retract force at 0.7 MPa securely shifts heavy coil stock while the stop screw locks the final position.
Packaging Changeover
Quickly adjust retract depth to accommodate different carton heights on a packaging line. The 30 mm window allows operators to reposition the stop without changing out the cylinder.
Variable Stop Clamping
Clamp metal workpieces at trial positions on a machining fixture. The equal both-way force ensures consistent 2268 N clamping at 0.5 MPa regardless of extension direction.
Is the Airtac SEJ Adjustable Cylinder SEJ80X75-30S the Right Cylinder?
Verify the 30 mm adjustment window covers your machine's required positioning range, letting you fine-tune the 45-75 mm effective stroke on-site. If you need less force, the 63 mm bore neighbor provides 1402 N at 0.5 MPa; if you need more, stepping up to the 100 mm bore yields 3681 N at 0.5 MPa. If your end position never changes, a fixed-stroke SED saves cost and complexity.
For drop-in ISO 15552 replacement matching, confirm the 75 mm nominal stroke, PT3/8 port, and your mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Note that the adjustable stop screw and air cushions only set the mechanical end and decelerate the load; they do not hold position on air loss. For fail-safe holding, specify an external rod lock.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (30mm) covers your range
- ✓ Equal force both directions OK
- ✓ Port/thread type (PT/G)
- ✓ Magnet (-S) for CMSE/DMSE sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the stop screw within the 30mm window; lock it after adjusting.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (LB/FA/TC/FTC/TCM1/TCM2).
- check Installation by qualified personnel per AirTAC docs.
Airtac SEJ Adjustable Cylinder SEJ80X75-30S FAQ
The SEJ80X75-30S has a 30 mm adjustment window via a stop screw on the back rod, allowing the effective stroke to be dialed down from 75 mm to a minimum of 45 mm. You lock the screw after setting the exact end position.
Because it is a double-rod cylinder, force is equal in both directions: 2268 N at 0.5 MPa, 3175 N at 0.7 MPa, and a maximum of 463 kgf at 1.0 MPa. The included magnet (-S) works with CMSE reed and DMSE electronic sensors.
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