Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 210mm 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
- Stroke210 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-50S
The AirTAC SAIJ125X210-50-S is a double-acting ISO 15552 profile cylinder engineered with a rear stroke adjuster, allowing you to dial back the nominal 210 mm travel by up to 50 mm. This creates a precise 160-210 mm usable stroke window, perfect for fine-tuning end positions during commissioning without swapping hardware. It delivers a robust 6136 N push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa.
Built with a SUS420J2 stainless steel rod (code A) for superior corrosion resistance, this model features PT tapered ports and a built-in magnet for position sensing. The extruded aluminum barrel includes sensor grooves on both sides, seamlessly accepting AirTAC CMSE reed and DMSE electronic solid-state switches. The rear stopper mechanism acts solely as a travel end deceleration point, not a load lock, meaning live air pressure is required to hold position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 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 SAIJ125AX210-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×210 | 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 SAIJ125AX210-50S Is Used
Product Size Changeover
Quickly adapt machinery for varying product lengths by dialing the stroke back from 210 mm to 160 mm, eliminating the need for physical spacer modifications during line changeovers.
End-Position Tuning
Fine-tune the exact retract distance during machine commissioning to prevent mechanical interference, using the rear screw to set the perfect 160-210 mm travel window.
Heavy-Duty Forming
Leverage the 11045 N push force at 0.9 MPa for pressing or forming tasks where the exact end-stop depth must be calibrated on-site to achieve the correct material deformation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-50S the Right Cylinder?
Select this 125 mm bore when an application requires substantial thrust—6136 N at 0.5 MPa—coupled with variable end-stop positioning. If your setup demands less force, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa, whereas upgrading to a 160 mm bore provides 10053 N. The adjustable stroke is ideal for product-size changeovers on a line, removing the need to bolt on external stops. For any load-holding requirements without continuous air pressure, integrate an external rod lock or explore the SAIL or BSAI series, as the SAIJ adjuster cannot hold loads unpowered.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 210 mm stroke, 50 mm adjustment range, PT port thread, and the -S magnet option. Mounting choices are restricted to Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 210 mm stroke is relatively long for this bore size, ensure external guides are used to prevent excessive rod side-loading.
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 SAIJ125AX210-50S FAQ
The rear adjuster screw allows you to shorten the effective travel by up to 50 mm. This creates a usable stroke window of 160-210 mm, letting you set the exact retract end-position at commissioning without changing the cylinder.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N. The maximum force at 1.0 MPa is 1251 kgf.
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