Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 170mm 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
- Stroke170 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-50S
The AirTAC SAIJ125X170-50-S is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, providing a usable travel window of 120-170 mm. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning. The standard carbon steel rod features an M27x2 thread, and the PT tapered ports ensure tight pneumatic sealing.
This SAIJ variant includes a -S magnet for position sensing with AirTAC CMSE reed and DMSE electronic switches. The rear adjuster acts purely as a mechanical stop for end-position tuning and does not hold the load without live air pressure. It uses the reduced SAIJ mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 170 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 SAIJ125X170-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×170 | 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 SAIJ125X170-50S Is Used
Product Size Changeovers
Dial in the exact 120-170 mm end position during format changes on packaging lines without physically replacing the actuator.
End-Position Tuning
Fine-tune the retract stop during commissioning to compensate for mechanical wear or sensor drift in heavy assembly presses.
Heavy Duty Ejection
Leverage the 6136 N push force at 0.5 MPa to eject metal parts, using the adjustable stop to vary the ejection distance safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-50S the Right Cylinder?
Select this 125 mm bore when your application requires high thrust (6136 N at 0.5 MPa) and variable end-stop positioning within a 120-170 mm window. The adjustable stroke is ideal for machine changeovers, allowing you to fine-tune the retract position without swapping cylinders or adding external stops. For lower force requirements, a 100 mm bore offers 3927 N at 0.5 MPa.
Because the 170 mm stroke falls below the 300 mm side-load threshold, a separate external guide is less critical, though the 32 mm rod diameter handles moderate side loads well. To replace an ISO 15552 cylinder, match the 125 mm bore, 170 mm stroke, 50 mm adjustment, PT G1/2 ports, and the -S magnet. For load-holding without live air, use an SAIL or BSAI cylinder instead of relying on this rear stop.
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 SAIJ125X170-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw lets you mechanically shorten the effective stroke from 170 mm down to 120 mm. This stopper only sets the travel end and deceleration; it does not lock or hold the load without continuous air pressure.
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