Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40S
The AirTAC SAIJ125X120-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates an 80-120mm usable travel window. Delivering 6136N of push force at 0.5MPa, it handles heavy-duty positioning. The PT tapered ports and SUS420J2 stainless steel rod (code A) provide robust fluid sealing and higher side-load resistance.
This model includes a magnet (-S) for CMSE reed and DMSE electronic sensors, fitting directly into the extruded aluminum barrel grooves. The rear adjuster acts as a travel stop for precise end-position tuning during commissioning, not as a lock. For load-holding without live air pressure, consider an AirTAC SAIL or BSAI cylinder.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125AX120-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125AX120-40S Is Used
Machine Changeover
Dial in the 80-120mm travel window during product size transitions without physically swapping the cylinder or repositioning external hard stops.
End-Position Tuning
Fine-tune the retract stroke end during commissioning using the rear screw, perfect for pressing or locating applications requiring exact positioning.
Heavy Load Positioning
Leverage the 6136N pull force and SUS420J2 stainless rod to move heavy jigs or fixtures, relying on the stop for precise deceleration.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40S the Right Cylinder?
Choose this 125mm bore when 80mm bore force (2513N at 0.5MPa) is insufficient and you need variable end-stops for product changeovers. The 32mm rod and M27x2 thread handle high side-loads, but for the 120mm stroke, external guides are still recommended for heavy loads. The adjustment range is ideal for dialing in exact positioning without adding external stops.
To replace an ISO 15552 cylinder, match the 125mm bore, 120mm nominal stroke, 40mm adjustment, PT G1/2 port, and -S magnet. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR. For fixed travel, use the standard SAI; for double-rod strength, use SAID.
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 SAIJ125AX120-40S FAQ
At 0.5MPa, it provides 6136N of push force and 5734N of pull force. At 0.9MPa, the push force reaches 11045N.
The rear adjuster allows you to trim the 120mm nominal stroke back by up to 40mm, creating an 80-120mm usable travel window. It acts as a mechanical stop and does not lock the load without air pressure.
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