Airtac SAIJ125 Adjustable Cylinder SAIJ125BX50-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX50-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX50-40S
The AirTAC SAIJ125X50-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering robust performance with a 6136N push force at 0.5 MPa. It features a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes a magnet for position sensing. The integrated rear stopper allows you to fine-tune the travel end-point at commissioning without physically swapping the cylinder.
With a nominal 50mm stroke and a 40mm adjustment range, this model provides a usable travel window of 10-50mm. This wide adjustment band is ideal for product-size changeovers on a packaging line. The rear screw acts purely as a travel stop and works alongside the variable air cushions at both ends to decelerate the load, but it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX50-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX50-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125BX50-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125BX50-40S Is Used
End-Position Tuning
Dial in the exact 10-50mm travel window during machine commissioning to achieve precise mechanical positioning without adding external stops.
Product Changeovers
Quickly adjust the rear stopper to accommodate varying package sizes on a conveyor line, reducing downtime between production runs.
Heavy-Duty Clamping
Leverage the 6136N push force at 0.5MPa for robust clamping tasks, using the adjustable stroke to control the clamp depth precisely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX50-40S the Right Cylinder?
Select this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5MPa) lacks the necessary thrust, but a 160mm bore (10053N) is physically oversized for your machine. Choose the adjustable SAIJ over a fixed SAI when your application requires variable end-stops or frequent machine setup changes. To replace an ISO 15552 cylinder, match the 125mm bore, 50mm stroke, 40mm adjustment, PT tapered port, and the -S magnet requirement.
For load-holding without continuous air pressure, note that this cylinder's adjuster is a stop, not a lock; you would need an external rod lock or the AirTAC BSAI clamp-lock series. Since the stroke is under 300mm, side-load stress is minimal, but the 32mm rod and M27x2 thread handle high forces well. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125BX50-40S FAQ
The rear adjusting screw acts as a mechanical stop that shortens the effective stroke. With a 50mm nominal stroke and a 40mm adjustment range, you can tune the usable travel window from 10mm to 50mm. The adjuster only sets the travel end and does not lock the load without live air pressure.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N. The maximum operating pressure is 1.0 MPa.
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