Airtac SEJ Adjustable Cylinder SEJ50X100-20FA
The AirTAC Airtac SEJ Adjustable Cylinder SEJ50X100-20FA 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 20mm window, so this Ø50mm unit covers an effective stroke of 80–100mm without changing cylinders. Force is equal in both directions.
- BoreØ50 mm
- Nominal stroke100 mm
- Adjust window20 mm
- Effective stroke80–100 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 SEJ50X100-20FA
The AirTAC SEJ50X100-20FA is a double-acting, double-rod ISO 15552 profile cylinder with an FA foot mounting. A rod exits both ends, yielding identical annulus areas so the drive force is equal both ways at 825 N (0.5 MPa). A stop screw on the back rod lets you mechanically dial the retract end over a 20 mm window, setting an effective stroke range of 80 to 100 mm without changing hardware.
This 50 mm bore profile cylinder runs at 30-800 mm/s with a PT1/4 port and M16x1.5 rod thread. It features field-adjustable air cushions at both ends to decelerate the load near stroke end. The FA mounting provides a rigid fixed-base footprint, and this specific SKU ships without a magnet, so it will not directly support CMSE or DMSE position sensing.
Airtac SEJ Adjustable Cylinder SEJ50X100-20FA Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ50X100-20FA |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 100 mm |
| Adjustment window | 20 mm (80–100 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 20mm 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 SEJ50X100-20FA
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 50 | Bore size in mm. |
| ×100 | Nominal stroke length in mm. |
| -20 | 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 SEJ50X100-20FA Is Used
Machine Commissioning
Dial in the exact 80-100 mm end-stop during machine commissioning, using the 825 N both-way force to precisely set the final clamping position without swapping hardware.
Part Height Changeover
Adjust the retract stroke on packaging lines to accommodate different carton heights, leveraging the FA foot mount for stable operation under varying loads.
Trial Positioning
Fine-tune the end-of-stroke position on assembly fixtures, using the 20 mm back-rod stop screw to match the exact contact point for a 1154 N (0.7 MPa) press fit.
Is the Airtac SEJ Adjustable Cylinder SEJ50X100-20FA the Right Cylinder?
Confirm the 20 mm adjustment window covers your required end-position range; the effective stroke dials from 80 mm up to 100 mm. If you need less force, the adjacent 40 mm bore delivers 528 N both ways at 0.5 MPa. If your application requires more thrust, step up to the 63 mm bore, which provides 1402 N both ways at 0.5 MPa.
If your end position never changes after commissioning, a fixed-stroke SED double-rod cylinder is sufficient. The standard air cushion decelerates the load but is not a lock; a plain SEJ does not hold position on air loss, so for fail-safe holding point to a BSED or an external rod lock. When replacing an ISO 15552 cylinder, verify the 100 mm stroke, 20 mm window, PT1/4 port, FA mounting, and the absence of a magnet.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (20mm) 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 20mm 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 SEJ50X100-20FA FAQ
The 20 mm adjustment window on the back-rod stop screw lets you mechanically dial the retract stroke from an effective 80 mm up to the nominal 100 mm. You set the exact end position on the machine and lock it in.
Because the rod exits both ends, the force is identical in both directions: 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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