Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40 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 SAIJ125X280-40
The AirTAC SAIJ125X280-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window from 240 to 280 mm. By turning the external stopper screw at commissioning, you can dial in the exact retract position without swapping the cylinder or adding external stops. This 125 mm bore generates a substantial 6136 N push force at 0.5 MPa, scaling up to 8590 N at 0.7 MPa, making it well-suited for heavy-duty positioning tasks.
The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE solid-state switches if a magnet is specified later. The 32 mm carbon steel rod and M27x2 rod thread provide high tensile strength and excellent side-load tolerance, while the PT tapered port ensures a robust, leak-free pneumatic connection. The rear adjuster acts purely as a mechanical travel stop to set the end position; it does not lock or hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40 |
|---|---|
| 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 SAIJ125X280-40
| 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 SAIJ125X280-40 Is Used
Product Changeover
Rapidly adjust the retract end-stop from 240 to 280 mm to accommodate different product lengths on a packaging line without changing hardware.
Heavy Pressing
Delivers 6136 N of push force at 0.5 MPa for securely seating large bearings or heavy components with exact end-position tuning.
Machine Setup
Fine-tune the end-of-stroke position during initial commissioning to perfectly time heavy-duty machinery cycles and prevent overtravel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40 the Right Cylinder?
Select this 125 mm bore when your application requires high thrust forces that smaller bores cannot deliver; stepping down to a 100 mm bore would reduce your 0.5 MPa push force from 6136 N to 3927 N. The adjustable stroke is ideal for machine setups requiring variable end-stops or product-size changeovers, offering flexibility that a fixed-stroke SAI cylinder cannot match. Because the rear adjuster only restricts travel and the air cushions manage deceleration, neither component will hold a suspended load. For dead-load holding without live air pressure, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder. When replacing an ISO 15552 cylinder, match the 125 mm bore, 280 mm stroke, 40 mm adjustment range, G1/2 port, and standard mounting options (Basic, FA, LB, TC, FTC, TCM1, TCM2).
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 SAIJ125X280-40 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If pressure is increased to 0.7 MPa, the push force scales up to 8590 N.
The nominal 280 mm stroke can be mechanically reduced by up to 40 mm via a rear stopper screw, creating a usable travel window of 240 to 280 mm. This allows you to fine-tune the retract end-position at commissioning without external stops.
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