Airtac SEJ Adjustable Cylinder SEJ50BX150-50S
The AirTAC SEJ Adjustable Cylinder SEJ50BX150-50S 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 100–150mm without changing cylinders. Force is equal in both directions.
- BoreØ50 mm
- Nominal stroke150 mm
- Adjust window50 mm
- Effective stroke100–150 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 SEJ50BX150-50S
The AirTAC SEJ50BX150-50S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 50 mm adjustable stroke window. A rod exits both ends, yielding identical annulus areas and an equal force of 825 N each way at 0.5 MPa. You dial the retract end from 100 mm up to 150 mm via a back-rod stop screw, then lock it for precise commissioning.
Built for washdown and corrosion resistance, this variant uses SUS304 stainless steel rods. The extruded aluminum barrel has no external tie rods, and the field-adjustable air cushion at both ends decelerates the load near the stroke ends. The integrated magnet supports CMSE reed or DMSE electronic sensors for position feedback.
Airtac SEJ Adjustable Cylinder SEJ50BX150-50S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ50BX150-50S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 150 mm |
| Adjustment window | 50 mm (100–150 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 SEJ50BX150-50S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 50 | Bore size in mm. |
| ×150 | 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 SEJ50BX150-50S Is Used
Packaging Stop Dial-In
Fine-tune the retract stop from 100 to 150 mm during commissioning to align a packaging flap folder precisely, leveraging the 825 N both-way force without hardware swaps.
Changeover Positioning
Adjust the end position on a filling machine to handle varying bottle heights, using the SUS304 rods to endure daily washdown cycles without corrosion.
Trial Actuation Limits
Dial the stroke back to test clamping pressure on delicate electronic assemblies, locking the stop screw once the exact 1154 N at 0.7 MPa contact point is found.
Is the Airtac SEJ Adjustable Cylinder SEJ50BX150-50S the Right Cylinder?
Verify the 50 mm adjustment window covers your required end-position range. If 825 N at 0.5 MPa is excessive, step down to the 40 mm bore for 528 N; if undersized, step up to the 63 mm bore for 1402 N. For fixed stops needing no tuning, a standard SED cylinder suffices. The stop screw sets the mechanical end but does not hold position on air loss; use a BSED or external rod lock for fail-safe holding. Match ISO 15552 replacements by bore, stroke, port PT1/4, and mounting.
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 SEJ50BX150-50S FAQ
The 50 mm adjustment window lets you mechanically dial the retract stroke from an effective 100 mm up to the nominal 150 mm via a back-rod stop screw, which you lock after setting the exact machine end position.
Because the rod exits both ends, 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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