Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-40S 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 SAIJ125AX275-40S
The AirTAC SAIJ125X275-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear mechanical adjuster. It delivers robust thrust, generating 6136N of pull force at 0.5 MPa and up to 11045N at 0.9 MPa. The integrated -S magnet enables direct position tracking via CMSE reed and DMSE electronic sensors housed within the dual-side extruded barrel grooves.
This specific SKU features a 40mm adjustment range, creating a 235-275mm usable travel window for fine-tuning retract end positions without swapping hardware. The piston rod utilizes SUS420J2 stainless steel (code A) for superior corrosion resistance, and PT tapered port threads ensure a reliable, sealed connection. The rear stopper solely dictates travel limits and must not be confused with a locking mechanism.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-40S |
|---|---|
| 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 SAIJ125AX275-40S
| 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 SAIJ125AX275-40S Is Used
Product Format Changeover
Dial in the 235-275mm travel window on the fly when switching a packaging line to accommodate different carton sizes without physically replacing the actuator.
Heavy-Duty End Position Tuning
Precisely set the retract stopper during machine commissioning to perfect the alignment of heavy 125mm bore assemblies, avoiding costly mechanical rework.
Variable End-Stop Bending
Adjust the rear mechanical stop to regulate the exact depth of stroke for metal bending or forming operations that require slight dimensional tweaks between batches.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-40S the Right Cylinder?
Selecting this 125mm bore over a smaller 100mm variant upgrades your 0.5 MPa pull force from 3681N to 6136N, providing the necessary power for heavy-duty forming and clamping. The 40mm adjustable stroke window is optimal for production lines requiring frequent format changes, allowing operators to dial in the exact 235-275mm travel distance during commissioning rather than machining custom external stops. Because the stroke is 275mm, an external guide is recommended to manage side-load stresses on the 32mm rod during extended travel.
For load-holding applications without continuous air pressure, this standard SAIJ adjuster acts only as a travel stop, not a brake; you must pivot to the SAIL (air-released lock) or BSAI (clamp-lock) series instead. This cylinder is dimensionally interchangeable per ISO 15552 standards, featuring a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
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 SAIJ125AX275-40S FAQ
The rear adjusting screw allows you to shorten the nominal 275mm stroke by up to 40mm, providing a usable travel window of 235-275mm. This mechanical stopper sets the end position but does not lock the load without live air pressure.
At a standard 0.5 MPa operating pressure, the SAIJ125 provides 6136N of pull force and 6136N of push force. At 0.9 MPa, the push force increases to 11045N.
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