The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX135-20S 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 SAIJ50X135-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 115-135 mm usable travel window, allowing you to dial back the nominal 135 mm stroke by up to 20 mm during commissioning. Delivering 982 N of push force at 0.5 MPa, it fits mid-range automation tasks perfectly.
This variant features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and includes a built-in magnet (-S) for position sensing. You can mount CMSE reed or DMSE electronic switches directly into the sensor grooves on both sides of the extruded aluminum barrel.
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX135-20S |
|---|---|
| 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.
Fine-tune the retract distance within the 115-135 mm window during machine commissioning to achieve perfect seating without swapping out the entire cylinder.
Quickly adjust the stroke end by up to 20 mm on packaging lines when handling slightly different product sizes, minimizing downtime.
Utilize the 982 N push force at 0.5 MPa to securely clamp variable-width workpieces, using the rear stopper to prevent over-travel.
Choose this 50 mm bore when a 40 mm bore (628 N push at 0.5 MPa) is underpowered, but a 63 mm bore (1559 N) is unnecessarily large. The adjustable stroke is ideal for machine setups requiring precise end-position tuning without adding external stops. For stroke lengths of 135 mm, the M16x1.5 rod thread handles standard side loads, though longer unsupported strokes still require external guiding.
Remember that the rear adjuster acts as a travel stop, not a lock; the SAIJ50X135-20-S will not hold a load without live air. For dead-end holding without pressure, consider the SAIL or BSAI series. To match this ISO 15552 cylinder exactly, specify the 50 mm bore, 135 mm stroke, 20 mm adjustment, PT tapered ports, your preferred mounting from the Basic, FA, LB, TC, FTC, TCM1, or TCM2 set, and the -S magnet.
Quick checklist
At a 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. If you need higher force, stepping up to a 63 mm bore yields 1559 N push at the same pressure.
The rear adjuster screw lets you shorten the effective travel from the nominal 135 mm down to 115 mm. This mechanical stopper only sets the end position and relies on the air cushion for deceleration; it does not lock the load without continuous air pressure.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models are processed and dispatched in 3-5 business days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.