Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30S
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X270-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke270 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 SAIJ125X270-30S
The AirTAC SAIJ125X270-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 270 mm travel by up to 30 mm. This yields a usable 240-270 mm end-position window, enabling precise fine-tuning at commissioning without swapping out the physical cylinder or adding external mechanical stops. It delivers robust thrust, generating 6136 N of pull force at 0.5 MPa and 8590 N at 0.7 MPa.
Built with a standard carbon steel piston rod and a PT tapered G1/2 port, this extruded aluminum barrel design includes dual sensor grooves for position detection. The integrated -S magnet supports AirTAC CMSE reed and DMSE electronic solid-state switches. It features adjustable air cushions at both ends to manage deceleration, though the rear adjuster acts strictly as a travel stop and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125X270-30S Is Used
Variable End-Stop Forming
Dial in the 240-270 mm travel window during machine setup to accommodate different material thicknesses without bolting on external stoppers.
Product Changeover Actuation
Quickly reposition the rear stopper on a packaging line to handle varying carton sizes, using the 30 mm adjustment range to fine-tune the retract stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30S the Right Cylinder?
Choose this 125 mm bore when an application requires high force, as it provides 6136 N of pull at 0.5 MPa. If your process needs less force, stepping down to an 80 mm bore yields 2268 N of pull at 0.5 MPa, whereas moving up to a 160 mm bore provides 9425 N of pull at 0.5 MPa. The adjustable stroke is ideal for product changeovers on a line, letting operators set variable end-stops on the fly. For true load-holding without continuous air pressure, this cylinder is insufficient; the rear stopper is not a brake, so you should specify an SAIL pneumatic lock, a BSAI clamp-lock, or an external rod lock.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 270 mm stroke, 30 mm adjustment range, PT G1/2 port, and the -S magnet. Mounting options include the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2. Since the 270 mm stroke is relatively long for this large bore, ensure an external guide supports the rod to prevent excessive side-loading.
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 SAIJ125X270-30S FAQ
At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you shorten the 270 mm nominal stroke by up to 30 mm, creating a usable 240-270 mm travel window for exact end-position tuning without changing the cylinder.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-30S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.