The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX125-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 125mm 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 SAIJ50X125-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down from a 125 mm nominal stroke to a minimum of 85 mm. This 40 mm adjustment window is ideal for dialing in exact end positions during machine commissioning or product changeovers without swapping out the physical cylinder. At 0.5 MPa, it delivers 982 N of push force and 825 N of pull force.
This SKU is configured with an SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance compared to standard carbon steel. It uses PT tapered port threads (G1/4) and operates without a magnet. The extruded aluminum barrel includes sensor grooves on both sides should you later need to track position. Remember that the rear adjuster acts purely as a mechanical stop for deceleration and end-position setting; it does not hold the load without live air pressure.
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX125-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 125 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. |
| ×125 | 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 exact 85-125 mm travel distance during initial setup to perfect end-positioning without machining new hard stops.
Quickly adapt the cylinder's stroke window on the fly when switching the production line to accommodate different product sizes.
Use the 40 mm rear adjustment range to precisely set the retract position for delicate assembly or pressing tasks.
Choose this 50 mm bore if your application requires around 982 N of thrust at 0.5 MPa, stepping up from a 40 mm bore that provides 628 N, or down from a 63 mm bore that yields 1559 N. An adjustable stroke is highly beneficial when you need variable end-stops for different product sizes on the same line, avoiding the need to bolt on external stoppers or maintain an inventory of fixed-stroke SAI cylinders. For load-holding without continuous air pressure, this cylinder is not suitable; you should look at the SAIL (air-released lock) or BSAI (clamp-lock) series instead. To replace an ISO 15552 cylinder, match the 50 mm bore, 125 mm stroke, 40 mm adjustment, PT G1/4 ports, and your required mounting interface (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Since the nominal stroke is 125 mm, the 20 mm rod and M16x1.5 thread handle standard loads well, but any significantly long unsupported stroke on a different model would still require an external guide.
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 of push force at the same pressure.
The rear adjuster screw allows you to mechanically shorten the effective travel from the 125 mm nominal stroke down to a minimum of 85 mm. This creates a 40 mm adjustment window for fine-tuning the end position at commissioning, but the adjuster acts only as a stop and does not lock the load without live air.
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.