Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40
The AirTAC SAIJ125X275-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N of push force at 0.5 MPa, utilizing a 32mm carbon steel rod and a PT G1/2 tapered port to handle heavy pneumatic loads. By turning the rear screw, you can trim the effective travel back by up to 40mm, creating a precise 235-275mm usable stroke window for exact end-position tuning.
Because the adjuster acts purely as a mechanical stop and works in tandem with the standard 40mm air cushion, it decelerates the load at the retract end but does not hold position without live air. The extruded aluminum barrel features sensor grooves on both sides, allowing you to easily mount CMSE reed or DMSE electronic switches if position feedback is required later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125X275-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125X275-40 Is Used
Heavy Press Tuning
Dial in the 235-275mm travel window on heavy pressing or clamping stations to accommodate material thickness variations without retooling the entire fixture.
Product Changeover
Quickly adjust the retract end-stop on a packaging line when switching between different product sizes, using the 40mm trim range to set precise ejection distances.
Machine Commissioning
Fine-tune the final resting position of heavy actuators during initial machine setup, eliminating the need to add external mechanical stops or spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40 the Right Cylinder?
Selecting this 125mm bore over the smaller 100mm variant steps your thrust up significantly from 3927N to 6136N at 0.5 MPa, making it suitable for heavier actuation demands. The adjustable stroke is ideal for machine setups requiring frequent product changeovers, allowing you to fine-tune the 235-275mm travel window during commissioning without physically swapping out a fixed-stroke SAI cylinder. When matching ISO 15552 replacements, verify the 275mm stroke, 40mm adjustment range, PT G1/2 port, and the specific mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Since the 275mm stroke is substantial, the 32mm rod helps manage side loads, but an external guide is still recommended for unsupported loads to prevent binding. For applications requiring the load to be held in place without continuous air pressure, note that this adjuster is not a lock; you should explore an external rod lock, a pilot-operated check valve, or the AirTAC SAIL and BSAI locking cylinder variants.
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 SAIJ125X275-40 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw allows you to shorten the 275mm nominal stroke by up to 40mm, providing an effective travel window of 235-275mm. This stopper sets the end position but does not lock the load without continuous air pressure.
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