Airtac SEJ Adjustable Cylinder SEJ50BX80-75S
The AirTAC SEJ Adjustable Cylinder SEJ50BX80-75S 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 75mm window, so this Ø50mm unit covers an effective stroke of 5–80mm without changing cylinders. Force is equal in both directions.
- BoreØ50 mm
- Nominal stroke80 mm
- Adjust window75 mm
- Effective stroke5–80 mm
- Port sizePT1/4
- CushionAdjustable, 30 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 SEJ50BX80-75S
The AirTAC SEJ50BX80-75S is a double-acting, double-rod ISO 15552 profile cylinder featuring a SUS304 stainless steel rod on both ends for corrosion resistance. A rear stop screw lets you mechanically dial the retract stroke over a 75 mm window, yielding an effective 5 to 80 mm stroke range for exact on-machine positioning.
This extruded-aluminum barrel design includes field-adjustable air cushions at both ends to manage end-of-stroke deceleration. The integrated magnet (-S) supports CMSE reed and DMSE electronic sensors for position feedback. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SEJ Adjustable Cylinder SEJ50BX80-75S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ50BX80-75S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 80 mm |
| Adjustment window | 75 mm (5–80 mm) |
| Configuration | Double rod, double acting |
| Port size | PT1/4 |
| 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, 30 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 75mm window. Port options: PT (standard) / G (BSPP).
Theoretical Output Force (Ø50mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 825 N |
| 0.7 MPa | 1155 N |
| Max (@1.0 MPa) | 168 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 SEJ50BX80-75S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 50 | Bore size in mm. |
| ×80 | Nominal stroke length in mm. |
| -75 | 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 SEJ50BX80-75S Is Used
Packaging Changeover
Dial the 75 mm retract window to match different carton heights on a packaging line, using the equal 825 N both-way force to push and pull folding mechanisms without repositioning hardware.
Washdown Stop Setting
Leverage the SUS304 rods in food processing to trial and lock a precise 5 to 80 mm end position for product deflectors, surviving high-pressure washdowns without corrosion.
Assembly Clamp Calibration
Fine-tune the clamping reach on machining fixtures, adjusting the stroke window on the machine to dial in the exact 1154 N both-way force at 0.7 MPa required for part seating.
Is the Airtac SEJ Adjustable Cylinder SEJ50BX80-75S the Right Cylinder?
Choose this 50 mm bore when you need an 825 N both-way force at 0.5 MPa and a highly variable stroke. If your application requires less force, the 40 mm bore provides 528 N both ways; if you need more push or pull, step up to the 63 mm bore for 1402 N both ways. If your end position never changes after commissioning, a fixed-stroke SED cylinder is sufficient. Note that the air cushion and stop screw only set the mechanical end and decelerate near stroke end; they do not hold position on air loss. For fail-safe holding, use an external rod lock or BSED. When replacing an ISO 15552 cylinder, match the 50 mm bore, 80 mm nominal stroke, PT1/4 port, and mounting hardware.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (75mm) 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 75mm 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 SEJ50BX80-75S FAQ
A stop screw on the back rod mechanically shortens the retract stroke over a 75 mm window. You can dial the effective stroke anywhere from 5 mm up to the nominal 80 mm, then lock it for precise end-position tuning.
Because the rod exits both ends, force is equal in both directions. It generates 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and a maximum of 168 kgf at 1.0 MPa.
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