Airtac SEJ Adjustable Cylinder SEJ50BX100-40S
The AirTAC SEJ Adjustable Cylinder SEJ50BX100-40S 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 40mm window, so this Ø50mm unit covers an effective stroke of 60–100mm without changing cylinders. Force is equal in both directions.
- BoreØ50 mm
- Nominal stroke100 mm
- Adjust window40 mm
- Effective stroke60–100 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 SEJ50BX100-40S
The AirTAC SEJ50BX100-40S is a double-acting, double-rod ISO 15552 profile cylinder featuring a SUS304 stainless steel rod for corrosion resistance. A rod exits both ends, yielding identical annulus areas and equal force in both directions—825 N each way at 0.5 MPa.
The retract end is mechanically adjustable via a back-rod stop screw, providing a 40 mm window to dial in the exact end position. This yields an effective stroke range of 60 to 100 mm. The -S magnet enables CMSE reed or DMSE electronic position sensing, and field-adjustable air cushions decelerate the load at both ends.
Airtac SEJ Adjustable Cylinder SEJ50BX100-40S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ50BX100-40S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 100 mm |
| Adjustment window | 40 mm (60–100 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 40mm 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 SEJ50BX100-40S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 50 | Bore size in mm. |
| ×100 | Nominal stroke length in mm. |
| -40 | 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 SEJ50BX100-40S Is Used
Packaging Feed Dial-In
Delivers 825 N both ways to push cartons, using the 40 mm retract window to fine-tune the pusher end position during commissioning without swapping hardware.
Container Changeover
Handles washdown duty via the SUS304 rod while adjusting the retract stroke between 60 and 100 mm to accommodate different container heights on a single conveyor.
Press Trial Positioning
Provides equal force extending and retracting for clamping, letting operators mechanically dial the back-rod stop screw to test exact material engagement limits.
Is the Airtac SEJ Adjustable Cylinder SEJ50BX100-40S the Right Cylinder?
Confirm the 40 mm adjustment window covers your positioning needs, allowing retract fine-tuning from 60 to 100 mm. For sizing, the adjacent bore down (40 mm) yields 528 N both ways at 0.5 MPa, while stepping up to a 63 mm bore provides 1402 N. If your end position never varies, a fixed-stroke SED 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, specify an external rod lock. This ISO 15552 cylinder matches any standard 50 mm bore, 100 mm stroke, PT1/4 port, and magnet configuration.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (40mm) 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 40mm 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 SEJ50BX100-40S FAQ
The retract end features a 40 mm adjustment window via a back-rod stop screw. You can dial the effective stroke down from 100 mm to a minimum of 60 mm to match your machine's exact end position, then lock it in place.
Because the rod exits both ends, force is equal 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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