Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-100
The AirTAC SAIJ125X135-100 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a 32mm carbon steel rod with an M27x2 thread, providing high rigidity against side loads. By turning the external rear screw, you can shorten the effective travel, creating a 35-135mm usable window for precise end-position tuning.
This model uses a PT tapered port and omits the FB, CA, CB, and CR mountings, supporting only the Basic, FA, LB, TC, FTC, TCM1, and TCM2 subset. The rear adjuster acts strictly as a travel stop to set the retract end, not as a lock; it cannot hold a load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125X135-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125X135-100 Is Used
Variable End-Stop Setup
Dial in the exact retract distance from 35 to 135mm during machine commissioning to accommodate different product sizes without changing the cylinder.
Heavy-Duty Changeover
Leverage the 6136N thrust capacity and 100mm adjustability to switch production lines quickly, modifying the stroke end-point on the fly.
Precision Positioning
Use the rear stopper screw to fine-tune the final end-position accurately, ensuring repeatable heavy-load placement in automated assembly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-100 the Right Cylinder?
Choose this 125mm bore when your application requires heavy thrust (6136N at 0.5 MPa) alongside a highly variable travel window. The 100mm adjustment range is perfect for product changeovers, allowing you to dial in the retract distance without swapping cylinders or adding external stops. If your force needs are lower, stepping down to an 80mm bore yields 2513N push force, whereas moving up to a 160mm bore provides 10053N. When replacing an ISO 15552 cylinder, match the 135mm stroke, 100mm adjustment, PT port, and mounting style; note that this SKU lacks a magnet for position sensing.
Because the nominal stroke is relatively short for this bore size, side-loading risks are minimal, but you should still ensure proper alignment to prevent premature seal wear. The variable air cushions at both ends work with the rear stopper to decelerate the load smoothly.
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 SAIJ125X135-100 FAQ
At a 0.5 MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. The maximum force at 1.0 MPa is 1251 kgf.
The rear adjuster screw allows you to trim the nominal 135mm stroke back by up to 100mm, resulting in a usable travel window of 35-135mm. This stopper sets the retract end-position but does not lock the load without continuous air pressure.
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