Airtac SAIJ125 Adjustable Cylinder SAIJ125X25-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X25-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 25mm 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
- Stroke25 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X25-20S
The AirTAC SAIJ125X25-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers robust thrust, generating 6136N of push force and 5734N of pull force at 0.5 MPa. The integrated -S magnet enables position sensing with AirTAC CMSE reed and DMSE electronic solid-state switches.
This specific SKU features a 25mm nominal stroke paired with a 20mm adjustment range, creating a precise 5-25mm usable travel window for highly confined operations. Unlike a fixed-stroke SAI cylinder, the rear stopper screw allows you to fine-tune the retract position during commissioning without adding external stops. The adjuster acts purely as a travel stop, not a lock, so it cannot hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X25-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X25-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 25 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 SAIJ125X25-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×25 | 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 SAIJ125X25-20S Is Used
Short-Stroke Clamping
Ideal for high-force clamping of heavy components where the 5-25mm adjustable travel window allows operators to dial in the exact grip position without swapping cylinders.
Product Changeover
Enables rapid line changeovers by letting technicians fine-tune the retract end-stop on the fly, accommodating slight variations in part dimensions.
Riveting & Pressing
Delivers 6136N of push force for light riveting or pressing tasks, where the rear adjuster ensures the tool retracts fully clear of the workpiece.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X25-20S the Right Cylinder?
Choose this 125mm bore cylinder when an application demands high force within a very short travel distance, stepping up from a 100mm bore that only provides 3927N push force at 0.5 MPa. The adjustable 5-25mm window is ideal for applications requiring exact end-position tuning during machine setup or product changeovers. Because the nominal stroke is under 300mm, side-load risks are minimized, though the 32mm carbon steel rod and M27x2 thread provide excellent rigidity and side-load capacity.
To match this ISO 15552 dimensionally interchangeable cylinder, confirm the 125mm bore, 25mm stroke, 20mm adjustment, PT tapered port threads, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR options. For applications requiring true load-holding without continuous air pressure, consider the SAIL or BSAI variants instead of relying on the rear stopper.
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 SAIJ125X25-20S FAQ
The rear adjuster screw acts as a mechanical stop that trims the effective travel. For this model, the 25mm nominal stroke and 20mm adjustment code create a 5-25mm usable travel window, allowing you to set the exact retract position during commissioning.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
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