Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-30S
The AirTAC SAIJ125X125-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and features a 125mm nominal stroke that can be fine-tuned down by up to 30mm, creating a precise 95-125mm usable travel window. This adjustability allows you to dial in the retract end position during commissioning without swapping hardware.
Fitted with a PT tapered port, a 32mm carbon steel rod, and an integrated magnet, this unit supports AirTAC CMSE reed and DMSE electronic sensors via the dual-side extruded barrel grooves. The rear screw functions strictly as a travel stop for deceleration, meaning it will not hold a load without live air pressure. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125X125-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125X125-30S Is Used
Machine Setup Changeover
Quickly fine-tune the 95-125mm travel window during product family changeovers, avoiding the need to physically swap out the entire cylinder for different package sizes.
Variable End-Stop Positioning
Dial in the exact retract position on heavy-duty press ejectors, using the 6136N thrust to push parts reliably while adjusting the end point on the fly.
Commissioning Calibration
Trim the effective stroke by up to 30mm during initial machine commissioning to perfect the timing and prevent mechanical crashes without adding external stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-30S the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5MPa) lacks the necessary thrust, but a 160mm bore is physically excessive. The adjustable 95-125mm travel window is ideal for product changeovers on a packaging line, allowing operators to reset the end stop quickly instead of machining external spacers or buying a fixed-stroke SAI cylinder. For load-holding without continuous air, pair this cylinder with an external rod lock or explore the SAIL or BSAI series.
When replacing an ISO 15552 cylinder, verify the 125mm bore, 125mm stroke, 30mm adjustment range, PT G1/2 port, and the required -S magnet. Operating speed ranges from 30-500mm/s. Because the 125mm stroke is relatively short for this large bore, side-load risks are minimal, but ensure the 32mm rod thread is properly aligned to maximize seal life.
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 SAIJ125X125-30S FAQ
At 0.5MPa it provides 6136N of push force and 5734N of pull force. If higher pressure is available, it can deliver up to 8590N push at 0.7MPa and 11045N at 0.9MPa.
The rear adjuster acts as a mechanical stop that shortens the 125mm nominal stroke by up to 30mm, giving an effective travel window of 95-125mm. It only sets the travel end and does not lock the load without live air.
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