Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40S
The AirTAC SAIJ125X275-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 275 mm stroke that can be fine-tuned down by up to 40 mm, creating a precise 235-275 mm usable travel window. This bore size delivers substantial thrust, generating 6136 N of push force and 5734 N of pull force at 0.5 MPa.
Because this SKU includes the -S magnet option, it supports direct mounting of AirTAC CMSE reed and DMSE electronic solid-state sensors along the dual-sided extruded aluminum barrel grooves. The carbon steel piston rod features an M27x2 thread, and the pneumatic supply connects via PT tapered G1/2 ports. The rear stopper allows you to dial in the retract end-position during commissioning, but remember it acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125X275-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125X275-40S Is Used
Product Size Changeovers
Dial in the 235-275 mm retract position during format changes on packaging lines, utilizing the 40 mm adjustment window to accommodate different product lengths without mechanical rebuilds.
Heavy Press Fit Tuning
Leverage the 6136 N push force at 0.5 MPa for pressing bearings or pins, using the rear stopper to fine-tune the exact insertion depth during machine commissioning.
Variable End-Stop Automation
Implement a single heavy-duty actuator on an assembly station to handle multiple part variants, adjusting the stroke end-point on the fly via the rear screw rather than repositioning physical hard stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-40S the Right Cylinder?
Select this 125 mm bore when an application requires heavy force that a 100 mm bore cannot provide, or when stepping down from a 160 mm bore to save space. At 0.5 MPa, the 100 mm bore offers 3927 N push force, while this 125 mm bore yields 6136 N. The adjustable stroke is ideal for product-size changeovers on a line, allowing you to shift the end-stop by up to 40 mm without swapping the cylinder or adding external stops. For a fixed end-position without the need for commissioning tweaks, a standard SAI cylinder is sufficient.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 275 mm stroke, 40 mm adjustment range, PT G1/2 port, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Since the 275 mm stroke is relatively long, ensure adequate external guiding to prevent excessive side-loading on the M27x2 rod. For load-holding without continuous air pressure, use an external rod lock or pilot-operated check valve, or select an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X275-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf of thrust.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 275 mm nominal stroke by up to 40 mm, providing a usable travel window of 235 to 275 mm. It only sets the end-position and does not lock or hold the load without live air pressure.
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