Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30
The AirTAC SAIJ125X280-30 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa, providing robust actuation for heavy machinery. By turning the external stopper screw, you can trim the nominal 280mm stroke back by up to 30mm, yielding a precise 250-280mm usable travel window without swapping hardware. This cylinder features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and uses PT tapered port threads.
Unlike a fixed-stroke SAI cylinder, this adjustable model allows fine end-position tuning directly at commissioning or during product changeovers. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept AirTAC CMSE reed or DMSE electronic sensors if a magnet is added later. The rear adjuster acts purely as a mechanical travel stop and does not lock the load; for position holding without live air pressure, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 280 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 SAIJ125AX280-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×280 | 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 SAIJ125AX280-30 Is Used
Product Size Changeovers
Quickly dial the stroke back by up to 30mm when a production line switches to a different pallet or package size, avoiding mechanical rebuilds.
Heavy Pressing Operations
Leverage the 6136N push force at 0.5MPa to firmly seat components, using the fine adjustment to control the exact bottoming position.
Machine Commissioning
Fine-tune the end-of-travel position during initial setup to perfect timing sequences without fabricating custom external stopper blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-30 the Right Cylinder?
Select this 125mm bore cylinder when an application requires substantial thrust—stepping down to a 100mm bore drops the 0.5MPa push force to 3927N, while stepping up to 160mm increases it to 10053N. The adjustable 250-280mm travel window is ideal for machines that process varying product sizes, allowing operators to dial in the exact end-stop without adding external bumpers. Because the stroke is 280mm, ensure adequate external guidance to prevent excessive side-loading on the 32mm rod.
When replacing an ISO 15552 cylinder, match the 125mm bore, 280mm nominal stroke, 30mm adjustment range, PT G1/2 port, and mounting style. SAIJ supports a reduced mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Remember that the rear screw and air cushions only decelerate the load; they do not function as a brake.
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 SAIJ125AX280-30 FAQ
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from the nominal 280mm down to 250mm. This creates a 250-280mm usable window for fine-tuning end positions. Note that this screw is a stop, not a lock, and cannot hold the load without continuous air pressure.
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If operating at 0.9 MPa, the push force increases to 11045N.
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