Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30
The AirTAC SAIJ125X140-30 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 110-140 mm usable travel window, allowing you to dial back the 140 mm nominal stroke by up to 30 mm during commissioning. Operating at 0.5 MPa, it delivers 6136 N of push force and 5734 N of pull force, making it well-suited for heavy-duty positioning tasks.
This model is configured with a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance compared to standard carbon steel. The adjuster acts purely as a mechanical stop to set the retract end position and does not hold the load without live air pressure. It supports a speed range of 30-500 mm/s and uses PT tapered port threads (G1/2) for pneumatic connections.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125AX140-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125AX140-30 Is Used
Machine Changeover
Fine-tune the 110-140 mm travel window during product size changes without physically swapping cylinders or adding external mechanical stops.
Variable End-Stop Setup
Dial in the exact retract position on heavy machinery, using the 30 mm rear adjuster to compensate for mechanical tolerance variations.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move and position heavy jigs or workpieces within automated manufacturing cells.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-30 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) lacks the necessary thrust, but you want to avoid stepping up to a 160 mm cylinder. The adjustable stroke is ideal for applications requiring variable end-stops or product changeovers, providing fine-tuning without swapping out a fixed-stroke SAI cylinder. Since the stroke is under 300 mm, side-load stress is moderate, but an external guide is still recommended for heavy radial loads.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 140 mm stroke, 30 mm adjustment range, G1/2 PT port, and mounting style. The SAIJ series supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR. Note that this unit lacks a magnet (-S not specified), so it cannot use AirTAC CMSE reed or DMSE electronic sensors without modification. For load-holding without live air, consider an SAIL or BSAI cylinder instead.
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 SAIJ125AX140-30 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw allows you to mechanically shorten the 140 mm nominal stroke by up to 30 mm, providing a usable travel window of 110-140 mm. The adjuster functions as a travel stop and does not lock or hold the load without continuous air pressure.
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