The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50BX155-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 155mm 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 SAIJ50X155-100-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to dial back the nominal 155 mm travel by up to 100 mm. This creates a highly flexible 55 to 155 mm usable stroke window, perfect for tuning end positions on the fly without adding external stops. The 50 mm bore delivers 982 N of push force and 825 N of pull force at 0.5 MPa, scaling up to 1767 N push at 0.7 MPa.
This configuration ships with a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes a magnet for position sensing. It is fully compatible with AirTAC CMSE reed and DMSE electronic sensors mounted into the dual-side extruded barrel grooves. It uses PT tapered ports sized G1/4, and the integrated adjustable air cushions at both ends ensure smooth deceleration across its 30 to 800 mm/s operating speed range.
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50BX155-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 155 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. |
| ×155 | 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.
Quickly dial in the 55 to 155 mm stroke window during product size transitions on a packaging line without swapping out the entire cylinder.
Use the rear adjuster to set precise retract end-positions for testing different sensor trigger points and mechanical limits.
Leverage the SUS304 stainless steel rod for clamping or lifting tasks in environments where standard carbon steel rods would rust.
Choose this 50 mm bore unit when your application requires 982 N of thrust at 0.5 MPa but might need slightly less force than a 63 mm bore (1559 N), or more power than a 40 mm bore (628 N). An adjustable-stroke cylinder is selected over a fixed-stroke SAI when you need precise end-position tuning during commissioning or frequent product changeovers. Remember that the rear adjuster acts purely as a travel stop and does not hold the load without live air pressure; for true fail-safe load holding, consider an external rod lock or the AirTAC SAIL or BSAI series.
To match this ISO 15552 dimensionally interchangeable cylinder for a replacement, verify the 50 mm bore, 155 mm nominal stroke, 100 mm adjustment range, PT G1/4 port thread, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. Since this specific model has a stroke under 300 mm, side-load risks are moderate, but always ensure the M16x1.5 rod thread and 20 mm rod diameter are properly guided to prevent binding.
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 0.7 MPa, the push force increases to 1374 N.
The rear adjuster screw lets you shorten the 155 mm nominal stroke by up to 100 mm, providing a usable travel window of 55 to 155 mm. This allows fine-tuning of the end position at commissioning without external stops.
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