Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 200mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-50S
The AirTAC SAIJ125X200-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 150 to 200 mm. Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore actuator handles heavy-duty positioning. The -S suffix indicates an integrated magnet compatible with AirTAC CMSE reed and DMSE solid-state sensors, which seat neatly into the dual-side extruded aluminum barrel grooves.
This model features a SUS420J2 stainless steel rod (material code A) and PT tapered port threads. The rear adjustment mechanism allows precise end-position tuning during commissioning without adding external stops. Remember that this adjuster acts purely as a travel stop and does not hold the load without live air pressure; for true load-holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 200 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×200 | 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.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-50S Is Used
Product Changeover
Dial in the 150-200 mm travel window to accommodate varying package sizes on a packaging line without physically replacing the actuator.
Machine Setup
Use the rear stopper to fine-tune the exact retract end-position during initial commissioning, ensuring perfect alignment of heavy 125 mm bore assemblies.
Variable End Stops
Adjust the effective stroke on the fly for automated processes that require periodic recalibration of the retraction point without adding external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-50S the Right Cylinder?
Select this 125 mm bore when an application requires substantial thrust—up to 6136 N at 0.5 MPa—alongside flexible end-positioning. If your process demands less force, stepping down to an 80 mm bore yields 2513 N, whereas moving up to a 160 mm bore provides 10053 N. The 50 mm adjustment range is particularly useful for machine setups requiring variable end stops across different product sizes, eliminating the need to physically swap out a fixed-stroke SAI cylinder.
When replacing an ISO 15552 actuator, match the 125 mm bore, 200 mm nominal stroke, 50 mm adjustment range, PT port threads, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Because the 200 mm stroke is within the 1500 mm standard limit for this bore, it is not a made-to-order item, but always ensure external guiding if side loads are present.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-50S FAQ
The rear adjuster allows you to shorten the effective travel by up to 50 mm, creating a usable stroke window of 150 to 200 mm. This stopper sets the end position but does not lock the load without continuous air pressure.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. If operating at 0.7 MPa, the push force increases to 8590 N.
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