Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50S
The AirTAC SAIJ125X155-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 6136N push force at 0.5MPa and features a built-in magnet for CMSE reed and DMSE electronic sensors. The rear stopper screw allows you to trim the effective travel, creating a usable 105-155mm window from the 155mm nominal stroke without adding external stops.
This 125mm bore profile cylinder uses PT tapered G1/2 ports and variable air cushions at both ends to decelerate heavy loads. The adjuster acts purely as a travel stop to fine-tune the retract end position during commissioning. It does not lock the load without live air pressure; for true holding force, explore the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125X155-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125X155-50S Is Used
Variable End-Stop Tuning
Dial in the retract position by up to 50mm during commissioning to perfectly align heavy clamping fixtures without machining new hard stops.
Product Size Changeover
Quickly adapt the 105-155mm travel window on a production line when switching between different product heights or formats.
Heavy Press Assembly
Leverage the 6136N thrust at 0.5MPa for pressing bearings, using the rear adjuster to precisely control the final bottoming depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-50S the Right Cylinder?
Choose this adjustable-stroke model when your application requires frequent end-position tuning or product-size changeovers, rather than a fixed-stroke SAI cylinder. If your thrust requirements are lower, dropping to a 100mm bore yields 3927N at 0.5MPa, while stepping up to a 160mm bore provides 10053N. To replace this ISO 15552 cylinder, match the 125mm bore, 155mm stroke, 50mm adjustment, PT G1/2 port, and -S magnet.
The 32mm diameter carbon steel rod with an M27x2 thread handles substantial side loads, but any stroke over 300mm requires an external guide rod to prevent binding. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR brackets.
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 SAIJ125X155-50S FAQ
A rear stopper screw trims the effective travel, allowing you to shorten the 155mm nominal stroke by up to 50mm. This creates a usable 105-155mm positioning window for fine-tuning the retract end position without swapping the cylinder.
At 0.5MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At the maximum 1.0MPa pressure, the push force reaches 1251kgf.
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Standard models usually ship in 3-4 days.
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