Airtac SEJ Adjustable Cylinder SEJ63X50-30S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ63X50-30S 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 Ø63mm unit covers an effective stroke of 20–50mm without changing cylinders. Force is equal in both directions.
- BoreØ63 mm
- Nominal stroke50 mm
- Adjust window30 mm
- Effective stroke20–50 mm
- Port sizePT3/8
- CushionAdjustable, 36 mm
About the Airtac SEJ Adjustable Cylinder SEJ63X50-30S
The AirTAC SEJ63X50-30S is a double-acting, double-rod ISO 15552 profile cylinder with a 30 mm adjustable stroke window. You can dial the retract end from 20 mm up to 50 mm to fine-tune the exact end position during machine commissioning. Because a rod exits both ends, the annulus area is identical in both directions, yielding an equal 1402 N of force each way at 0.5 MPa.
This 63 mm bore unit runs at 30-800 mm/s and features field-adjustable air cushions at both ends to manage deceleration. The -S magnet option supports CMSE reed and DMSE electronic sensors for position feedback. A stop screw on the back rod sets the mechanical limit; you must lock it after setting, as it is not a fail-safe brake.
Airtac SEJ Adjustable Cylinder SEJ63X50-30S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ63X50-30S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 50 mm |
| Adjustment window | 30 mm (20–50 mm) |
| Configuration | Double rod, double acting |
| Port size | PT3/8 |
| Rod thread | M16×1.5 |
|---|---|
| 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 (Ø63mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 1402 N |
| 0.7 MPa | 1962 N |
| Max (@1.0 MPa) | 286 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 SEJ63X50-30S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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 SEJ63X50-30S Is Used
Press Stroke Tuning
Dial in the 20-50 mm effective stroke to precisely set contact height on light assembly presses, leveraging the 1402 N both-way force.
Changeover Stops
Adjust the retract position on packaging conveyors to accommodate different carton heights without swapping out the entire cylinder hardware.
Trial Positioning
Use the 30 mm window to test end positions in prototype jigs, locking the back-rod stop screw once the optimal travel is found.
Is the Airtac SEJ Adjustable Cylinder SEJ63X50-30S the Right Cylinder?
This 30 mm adjustment window is ideal for dialing in precise end positions on variable-stop fixtures. If you need less force, stepping down to the 50 mm bore yields 825 N both ways at 0.5 MPa. For heavier loads, the 80 mm bore provides 2268 N both ways. If your application never requires stroke changes, a fixed-stroke SED cylinder is sufficient.
When replacing an ISO 15552 cylinder, verify the 50 mm nominal stroke, the 30 mm window, PT3/8 port, and your mounting choice (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that a plain SEJ does not hold position on air loss; use an external rod lock for fail-safe holding.
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 SEJ63X50-30S FAQ
The SEJ63X50-30S has a stop screw on the back rod that lets you mechanically shorten the retract stroke over a 30 mm window. The effective stroke range is 20 to 50 mm.
Because it is a double-rod cylinder, force is equal in both directions: 1402 N at 0.5 MPa, 1962 N at 0.7 MPa, and a maximum of 286 kgf at 1.0 MPa.
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