Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50S
The AirTAC SAIJ125X900-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 850-900 mm usable travel window, allowing you to dial back the 900 mm nominal stroke by up to 50 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy positioning tasks while remaining dimensionally interchangeable per ISO 15552.
This SKU includes a standard carbon steel piston rod and a -S magnet for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides for flexible switch mounting. Because the 900 mm stroke is long, the 32 mm rod and M27x2 thread still require an external guide to manage side loads. The rear adjuster acts purely as a travel stop and cannot hold the load without live air.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAIJ125X900-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAIJ125X900-50S Is Used
Variable End Stops
Dial in the exact retract position within the 850-900 mm window for high-precision machining or pressing tasks without mechanical rework.
Product Size Changeover
Quickly adapt automated lines to new package dimensions by turning the rear adjuster, saving time during format transitions.
Heavy Load Positioning
Leverage 6136 N of thrust at 0.5 MPa to move heavy pallets or chassis components, using the adjuster to fine-tune the final stop.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50S the Right Cylinder?
Select this 125 mm bore when your application requires more thrust than a 100 mm cylinder (which provides 3927 N at 0.5 MPa) but less than the massive 160 mm frame (10053 N). The adjustable stroke is ideal for machine setups requiring variable end stops or product-size changeovers, eliminating the need to swap cylinders or bolt on external stops. For load-holding without continuous air pressure, consider the SAIL or BSAI series instead, as the SAIJ adjuster is not a lock.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 900 mm stroke, 50 mm adjustment range, PT tapered port thread, and -S magnet. This unit operates at 30-500 mm/s. Given the 900 mm stroke, always use an external guide rail to prevent binding and excessive wear on the rod seals.
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 SAIJ125X900-50S FAQ
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop, allowing you to trim the effective travel anywhere between 850 mm and 900 mm. It only sets the end position and does not lock the load without live air pressure.
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