Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 950mm 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
- Stroke950 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50
The AirTAC SAIJ125X950-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 950 mm nominal stroke by up to 50 mm. This creates a precise 900-950 mm usable travel window, allowing you to fine-tune the retract end-position at commissioning without swapping out the entire actuator. In the 125 mm bore class, it delivers 8590 N of push force and 5734 N of pull force at 0.7 MPa, making it suitable for heavy-duty positioning tasks.
This model features a 32 mm carbon steel piston rod with an M27x2 thread, designed to handle substantial side loads, though at 950 mm of travel an external guide is highly recommended to prevent rod binding. The extruded aluminum barrel incorporates sensor grooves on both sides for CMSE reed or DMSE electronic switches, though this specific SKU is configured without a magnet. The rear adjuster acts strictly as a travel stop for end-position tuning, not as a lock, and cannot hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 950 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 SAIJ125X950-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×950 | 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 SAIJ125X950-50 Is Used
Heavy Material Positioning
Ideal for shifting heavy workpieces on a machining line, using the 50 mm adjustment window to dial in the exact retract distance for different fixture sizes without changing cylinders.
Product Changeover Stops
Enables rapid adaptation of retract stops on a conveyor sorting system when package dimensions change, fine-tuning the end position during commissioning rather than relying on fixed hardware.
Large Assembly Presses
Provides the 8590 N push force needed for large assembly operations while allowing operators to trim the stroke back up to 50 mm to accommodate varying tooling heights or assembly tolerances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50 the Right Cylinder?
Select this 125 mm bore adjustable-stroke cylinder when your application requires exact end-position tuning during machine setup or product changeover, avoiding the need to bolt on external stops or manufacture a custom-length actuator. If your force requirements are lower, stepping down to an 80 mm bore yields 3518 N of push force at 0.7 MPa, whereas stepping up to a 160 mm bore provides 14074 N. For operations that require true load-holding without continuous air pressure, a standard SAIJ is insufficient; you should consider the SAIL air-released lock or BSAI clamp-lock series instead.
As a dimensionally interchangeable ISO 15552 profile cylinder, this unit matches standard mounting interfaces. To replace or integrate this model, confirm the following: 125 mm bore, 950 mm stroke, 50 mm adjustment range, PT tapered port threads, G1/2 air supply ports, no magnet, and the SAIJ mounting set which includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the stroke exceeds 300 mm, always pair this cylinder with an external linear guide to support the load and absorb lateral forces.
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 SAIJ125X950-50 FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder generates 8590 N of push force and 5734 N of pull force. It can deliver up to 11045 N of push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the 950 mm nominal stroke by up to 50 mm, creating a usable travel window of 900-950 mm. It acts as a mechanical stop to fine-tune the end position and is not a lock, meaning the cylinder will not hold its load without live air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-50
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.