Airtac SEJ Adjustable Cylinder SEJ63BX80-50
The AirTAC SEJ Adjustable Cylinder SEJ63BX80-50 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 50mm window, so this Ø63mm unit covers an effective stroke of 30–80mm without changing cylinders. Force is equal in both directions.
- BoreØ63 mm
- Nominal stroke80 mm
- Adjust window50 mm
- Effective stroke30–80 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 SEJ63BX80-50
The AirTAC SEJ63BX80-50 is a double-acting, double-rod ISO 15552 profile cylinder featuring a SUS304 stainless steel rod for corrosion resistance. A rod exits both ends, ensuring the annulus area remains identical in both directions. This yields equal force and speed extending and retracting, delivering 1402 N each way at 0.5 MPa and 1962 N at 0.7 MPa.
The -50 tail designates a 50 mm adjustable stroke window, meaning the retract end can be dialed in to shorten the effective stroke down to 30 mm. You set the exact end position using a stop screw on the back rod, then lock it down. This cylinder lacks a magnet, so it will not support CMSE or DMSE position sensors.
Airtac SEJ Adjustable Cylinder SEJ63BX80-50 Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ63BX80-50 |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 80 mm |
| Adjustment window | 50 mm (30–80 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 50mm 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 SEJ63BX80-50
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 63 | Bore size in mm. |
| ×80 | Nominal stroke length in mm. |
| -50 | 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 SEJ63BX80-50 Is Used
Packaging Machine Changeover
Dial in the 30 to 80 mm retract stroke to match varying box flap heights during format changeover, utilizing the 1962 N both-way force at 0.7 MPa to securely fold heavy cardboard.
CNC Fixture Clamping
Fine-tune the exact clamping end-position on a CNC lathe loader, using the SUS304 rod to resist coolant washdown while providing 1402 N of equal push and pull force at 0.5 MPa.
Lab Dispenser Calibration
Adjust the mechanical stop screw over the 50 mm window to precisely set a 30 mm dispensing stroke for varying fluid volumes, locking the rod in place for repeatable cycles.
Is the Airtac SEJ Adjustable Cylinder SEJ63BX80-50 the Right Cylinder?
This 63 mm bore provides 1402 N of both-way force at 0.5 MPa. If your load is lighter, the next bore down is 50 mm, providing 825 N both ways; for heavier demands, stepping up to 80 mm yields 2268 N. The 50 mm adjustment window is ideal for fine-tuning a 30 to 80 mm stroke range during machine commissioning without changing hardware. If your end position never varies, a fixed-stroke SED is sufficient. Remember that the adjustable air cushion decelerates the load near the end of travel but does not hold position on air loss; for fail-safe holding, use an external rod lock. As a dimensionally interchangeable ISO 15552 cylinder, verify your bore, port PT3/8, and mounting footprint (Basic, FA, LB, TC, FTC, TCM1, TCM2) for a direct replacement.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (50mm) 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 50mm 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 SEJ63BX80-50 FAQ
It features a stop screw on the back rod that lets you mechanically shorten the retract stroke by up to 50 mm. The effective stroke range is 30 to 80 mm, allowing you to dial in the exact end position during commissioning and lock it without changing hardware.
Because the rod exits both ends, force is equal in both directions. It generates 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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