Airtac SEJ Adjustable Cylinder SEJ80BX25-10SH
The AirTAC SEJ Adjustable Cylinder SEJ80BX25-10SH 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 10mm window, so this Ø80mm unit covers an effective stroke of 15–25mm without changing cylinders. Force is equal in both directions.
- BoreØ80 mm
- Nominal stroke25 mm
- Adjust window10 mm
- Effective stroke15–25 mm
- Port sizePT3/8
- CushionAdjustable, 36 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 SEJ80BX25-10SH
The AirTAC SEJ80BX25-10SH is a double-acting, double-rod ISO 15552 profile cylinder with a mechanically adjustable retract stroke. A rod exits both ends, yielding identical annulus areas and an equal drive force of 2268 N each way at 0.5 MPa. The rear stop screw provides a 10 mm adjustment window, setting the effective stroke range from 15 to 25 mm for exact end-position tuning.
Configured for harsh environments, this variant features a SUS304 stainless steel rod and FKM Viton seals, extending the operating temperature range up to 150 C. The extruded aluminum barrel contains no external tie rods, and adjustable air cushions at both ends decelerate the load near stroke end without acting as a mechanical lock.
Airtac SEJ Adjustable Cylinder SEJ80BX25-10SH Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ80BX25-10SH |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 25 mm |
| Adjustment window | 10 mm (15–25 mm) |
| Configuration | Double rod, double acting |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
|---|---|
| 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, 36 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 10mm window. Port options: PT (standard) / G (BSPP).
Theoretical Output Force (Ø80mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 2268 N |
| 0.7 MPa | 3175 N |
| Max (@1.0 MPa) | 463 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 SEJ80BX25-10SH
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 80 | Bore size in mm. |
| ×25 | Nominal stroke length in mm. |
| -10 | 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 SEJ80BX25-10SH Is Used
Washdown Diverter Gates
Tunes the 15-25 mm stroke to hit exact gate angles on food-grade conveyors, using the 2268 N both-way force to move heavy stainless flaps while resisting 150 C cleaning cycles.
Hot-End Part Changeover
Dials in the retract position to accommodate varying billet heights in forging ejectors, leveraging the SUS304 rod and FKM seals to withstand radiant heat up to 150 C.
Press Brake Commissioning
Fine-tunes the mechanical stop during machine setup to match material thickness precisely, using the equal both-way thrust to maintain consistent clamping pressure.
Is the Airtac SEJ Adjustable Cylinder SEJ80BX25-10SH the Right Cylinder?
Verify the 10 mm adjustment window covers your required positioning range, giving a usable 15 to 25 mm stroke. If you need less force, the adjacent 63 mm bore provides 1402 N at 0.5 MPa; if you need more thrust, stepping up to the 100 mm bore yields 3681 N at 0.5 MPa. For fixed-position tasks not requiring end-tuning, a standard SED double-rod cylinder is sufficient.
This cylinder does not hold position on air loss; use an external rod lock for fail-safe holding. It is dimensionally interchangeable per ISO 15552—match the 80 mm bore, 25 mm stroke, PT3/8 port, and mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) for direct replacement. The built-in magnet supports CMSE reed and DMSE electronic sensors for position feedback.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (10mm) 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 10mm 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 SEJ80BX25-10SH FAQ
A stop screw on the rear rod lets you dial the retract end over a 10 mm window, making the effective stroke 15 to 25 mm. You lock the screw after setting the exact end position required for your machine.
Because it is a double-rod cylinder, force is equal both ways: 2268 N at 0.5 MPa, 3175 N at 0.7 MPa, and a maximum of 463 kgf at 1.0 MPa. The SUS304 rod and FKM seals allow operation up to 150 C.
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