The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX135-100 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 SAIJ50X135-100 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 982N of push force at 0.5 MPa and provides a usable travel window of 35 to 135mm, letting you dial back the nominal stroke by up to 100mm during commissioning.
This bore size features a 20mm piston rod and G1/4 porting. The rod is constructed from SUS420J2 stainless steel (code A) for enhanced durability against moisture, and the body uses an extruded aluminum barrel with sensor grooves on both sides. The rear screw acts purely as a travel stop for end-position tuning, not a load-holding lock.
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX135-100 |
|---|---|
| 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 exact retraction point between 35 and 135mm during machine setup to accommodate new product dimensions without changing hardware.
Quickly adjust the stroke length on packaging lines handling different carton sizes, using the 100mm trim range to reset stops rapidly.
Fine-tune the final end position during installation to prevent mechanical interference, leveraging the rear stopper instead of external shims.
Choose this 50mm bore when you need higher thrust than the 40mm version (628N at 0.5 MPa) but want a smaller footprint than the 63mm option (1559N). The 100mm adjustment range is ideal for machines processing varying product sizes, allowing you to reposition the end stop without swapping cylinders or adding external stops. For strokes of 135mm, the 20mm rod handles standard side loads well, but always guide the load externally to prevent rod binding. To replace an ISO 15552 cylinder, match the 50mm bore, 135mm stroke, PT tapered port threads, SUS420J2 rod, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting set. Note that SAIJ omits FB, CA, CB, and CR mounts. Because this unit lacks a magnet (-S), it cannot host CMSE or DMSE sensors. If the machine loses air, the rear stopper and air cushions will not hold the load; consider a SAIL or BSAI cylinder for pneumatic locking.
Quick checklist
At 0.5 MPa operating pressure, this 50mm bore cylinder provides 982N of push force and 825N of pull force. At 0.7 MPa, the push force increases to 1374N.
The rear adjuster screw allows you to shorten the effective stroke by up to 100mm, creating a usable travel window of 35 to 135mm. The adjuster functions as a mechanical stop to set the end position and does not lock the load without live air pressure.
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