Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-40
The AirTAC SAIJ125X550-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down from a 550 mm nominal stroke to a 510 mm minimum. Delivering a substantial 6136 N pull force at 0.5 MPa (and up to 11045 N at 0.9 MPa), it handles heavy actuation tasks with precision. The PT tapered port and carbon steel rod are standard, matching the exacting requirements of large-bore pneumatic setups.
This adjustable variant omits the FB, CA, CB, and CR mounts, utilizing a focused mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. The rear adjuster acts purely as a mechanical stop for end-position tuning during commissioning; it is not a lock. For applications requiring the load to be held without live air pressure, you should integrate an external rod lock or look into the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125X550-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125X550-40 Is Used
Heavy Material Forming
Provides the high thrust needed for pressing or stamping operations, with the 40 mm stroke adjustment allowing precise calibration of the pressing depth.
Product Changeover
Enables rapid line adjustments when switching product sizes, dialing back the 550 mm stroke to 510 mm to accommodate varying workpiece lengths without tool changes.
Large Fixture Clamping
Secures heavy workpieces in machining fixtures, using the adjustable end-stop to set the exact clamping position during initial machine commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-40 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3681 N pull at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore (providing 9425 N pull at 0.5 MPa) would be excessive. The 40 mm adjustment window is ideal for product changeovers, letting you shift the end-stop without physically swapping the cylinder or adding external shims. When replacing an ISO 15552 cylinder, match the 550 mm stroke, 40 mm adjuster, PT G1/2 port, and mounting style; note that no magnet is specified, so CMSE or DMSE sensors cannot be used.
Because the 550 mm stroke creates a long lever arm, the 32 mm carbon steel rod is highly susceptible to side loads. Even with the robust M27x2 rod thread, you must use an external guide to prevent premature seal wear and binding. The cylinder operates at 30-500 mm/s, and the adjustable air cushions at both ends help decelerate the moving load, though they do not function as a brake.
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 SAIJ125X550-40 FAQ
At 0.5 MPa, it provides 6133 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective travel from the nominal 550 mm down to 510 mm. This is useful for fine-tuning end positions at commissioning without swapping cylinders.
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