Airtac SEJ Adjustable Cylinder SEJ50X75-50
The AirTAC Airtac SEJ Adjustable Cylinder SEJ50X75-50 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 Ø50mm unit covers an effective stroke of 25–75mm without changing cylinders. Force is equal in both directions.
- BoreØ50 mm
- Nominal stroke75 mm
- Adjust window50 mm
- Effective stroke25–75 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 SEJ50X75-50
The AirTAC SEJ50X75-50 is a double-acting, double-rod ISO 15552 profile cylinder with a 50 mm bore. A rod exits both ends, ensuring the annulus area is identical in both directions. This means drive force is perfectly equal extend and retract, delivering about 825 N each way at 0.5 MPa. The extruded aluminum barrel contains no external tie rods, guaranteeing true ISO 15552 dimensional interchangeability.
The -50 suffix denotes a 50 mm adjustment window on the back rod stop screw. You can dial the retract end to shorten the nominal 75 mm stroke down to 25 mm, giving an effective stroke range of 25-75 mm. This allows precise fine-tuning of the mechanical end position directly on the machine during commissioning. The cylinder features field-adjustable air cushions at both ends to decelerate the load near stroke end, operating at speeds from 30-800 mm/s.
Airtac SEJ Adjustable Cylinder SEJ50X75-50 Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ50X75-50 |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 50 mm (25–75 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 50mm 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 SEJ50X75-50
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SEJ50X75-50 Is Used
Stop Position Calibration
Dial in the 25-75 mm effective stroke to precisely match a machining stop, utilizing the 825 N both-way force to hold the workpiece securely during clamping.
Quick Part Changeover
Adjust the retract end on the fly when switching a packaging line to a different carton height, avoiding the need to swap out the entire 50 mm bore cylinder hardware.
Trial Positioning Setup
Use the back-rod stop screw to test exact insertion depths of a probe into an assembly housing, locking the screw once the optimal 825 N force contact point is found.
Is the Airtac SEJ Adjustable Cylinder SEJ50X75-50 the Right Cylinder?
Confirm the 50 mm adjustment window covers your required positioning range, providing an effective 25-75 mm stroke. If you need less force, the adjacent 40 mm bore delivers 528 N both ways at 0.5 MPa; if you need more power, step up to the 63 mm bore, which provides 1402 N both ways at 0.5 MPa. If the stroke never needs adjustment, a fixed-stroke SED double-rod cylinder is sufficient. For a drop-in ISO 15552 replacement, match the 75 mm stroke, PT1/4 port, and your required mounting (Basic, FA, LB, TC, FTC, TCM1, or TCM2). This SKU lacks a magnet (-S), so it cannot host CMSE or DMSE position sensors. Note that the air cushion and stop screw only set the mechanical end and decelerate the load; they do not hold position on air loss. For fail-safe holding, use an external rod lock or a BSED series cylinder.
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 SEJ50X75-50 FAQ
The -50 suffix indicates a 50 mm adjustment window. By turning the stop screw on the back rod, you can mechanically shorten the retract stroke from the nominal 75 mm down to 25 mm, giving an effective stroke range of 25-75 mm. You lock the screw after setting your desired end position.
Because the rod exits both ends, the force is equal in both directions. It provides 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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