The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX135-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 135mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
The AirTAC SAIJ50X135-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 135 mm nominal stroke that can be fine-tuned down by up to 50 mm, yielding an effective travel window of 85-135 mm. Delivering 982 N of push force at 0.5 MPa, it handles mid-range automation tasks with precision.
This unit features a SUS420J2 stainless steel rod and PT tapered port threads. The extruded aluminum barrel includes dual sensor grooves, allowing you to add CMSE reed or DMSE electronic switches later if positioning feedback becomes necessary.
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX135-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 135 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×135 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Dial in the 85-135 mm travel window during format changes on packaging lines, accommodating different carton heights without changing hardware.
Fine-tune the retracted end position during machine commissioning to achieve exact clamping depth, preventing damage to delicate workpieces.
Adjust the stroke length on conveyor sorting arms on the fly to handle varying package widths without repositioning the cylinder mount.
Select this 50 mm bore cylinder when an application requires 982 N push force at 0.5 MPa but demands variable end-stops for frequent product changeovers. If your setup needs less force, stepping down to a 40 mm bore yields 628 N; if more clamping power is required, a 63 mm bore provides 1559 N. The rear screw mechanism allows you to trim the stroke without physically swapping the cylinder or adding external stops.
For ISO 15552 replacement matching, ensure the new unit shares the 50 mm bore, 135 mm stroke, 50 mm adjustment, PT port thread, and standard mounting. Remember that the rear adjuster functions strictly as a travel stop, not a locking device. The cylinder cannot hold a load without live air pressure, so consider an external pilot-operated check valve for load-holding applications.
Quick checklist
At 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 200 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 135 mm nominal stroke by up to 50 mm. This creates an adjustable travel window between 85 mm and 135 mm to fine-tune the end position without adding external stops.
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