Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50S
The AirTAC SAIJ125X70-50-S is a double-acting ISO 15552 profile cylinder featuring a rear mechanical adjuster that trims the retract end-position. Outfitted with a -S magnet, the extruded aluminum barrel integrates sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic solid-state switches. The standard carbon steel piston rod provides robust durability for high-force industrial tasks.
By turning the rear stopper screw, technicians can fine-tune the effective travel window from 20 to 70 mm without swapping hardware. At 0.7 MPa, this 125 mm bore generates 8590 N of push force and 5734 N of pull force. The assembly includes adjustable air cushions at both ends to dissipate kinetic energy, operating at speeds between 30 and 500 mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125X70-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SAIJ125X70-50S Is Used
Multi-Format Pressing
Dial the stroke back from 70 to 20 mm to accommodate varying material thicknesses on a single high-force press line without changing the cylinder.
Machine Changeover
Fine-tune the retract end-position during product size transitions to maintain precise mechanical timing without adding external stopper blocks.
Heavy Assembly Stops
Leverage the 8590 N push force at 0.7 MPa to seat heavy components, using the rear screw to set exact final positioning limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-50S the Right Cylinder?
Select this 125 mm bore adjustable cylinder when an application demands high thrust combined with variable end-stops for rapid product changeovers. If the 5734 N pull force at 0.7 MPa is excessive, dropping to an 80 mm bore reduces that output to 2268 N. The rear adjuster functions strictly as a travel stop, not a lock; the SAIJ cannot hold a load without live air pressure. For fail-safe load holding, specify an external pilot-operated check valve or select the AirTAC SAIL or BSAI clamp-lock series.
Dimensionally interchangeable with ISO 15552 cylinders, this model accepts PT G1/2 tapered ports and supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2. The 32 mm rod and M27x2 thread provide high rigidity, though any stroke at or above 300 mm requires an external guide rail to prevent side-load damage.
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 SAIJ125X70-50S 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. The maximum thrust is 1251 kgf at 1.0 MPa.
The rear stopper screw allows you to shorten the nominal 70 mm stroke by up to 50 mm, creating an adjustable travel window of 20 to 70 mm. The adjuster acts as a mechanical stop and does not lock the load without live air pressure.
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