Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30
The AirTAC SAIJ125X40-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end-of-travel position. With a nominal 40mm stroke and a 30mm adjustment range, the usable travel window is 10-40mm, letting you dial in the exact retract distance without adding external stops. This 125mm bore version delivers a robust 6136N push force at 0.5MPa, making it well-suited for heavy-duty positioning tasks.
Unlike a fixed-stroke SAI cylinder, this model uses a rear mechanical screw to set the retract endpoint precisely at commissioning. The adjuster acts purely as a travel stop and does not hold the load without live air pressure; for true load-holding, consider an SAIL or BSAI series cylinder. The extruded aluminum barrel includes sensor grooves on both sides, and the carbon steel rod with its M27x2 thread provides a durable interface for high-cycle automation.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125X40-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125X40-30 Is Used
Product Changeovers
Adjust the 10-40mm travel window on the fly to accommodate different product sizes on a single machine bed without replacing the cylinder.
End-Position Tuning
Fine-tune the retract stop during initial commissioning to perfect the resting position of heavy jigs or fixtures.
Heavy-Duty Clamping
Leverage the 6136N push force at 0.5MPa to secure large workpieces, using the adjustable stop to set precise clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30 the Right Cylinder?
Choose this 125mm bore cylinder when your application requires substantial thrust—6136N push and 5734N pull at 0.5MPa. If your force requirements are lower, stepping down to an 80mm bore yields 2513N push, whereas moving up to a 160mm bore provides 10053N push. The 30mm adjustment range is ideal for product-size changeovers on a packaging line, giving you a 10-40mm travel window to accommodate varying material thicknesses without swapping hardware.
As a dimensionally interchangeable ISO 15552 cylinder, it mounts via Basic, FA, LB, TC, FTC, TCM1, or TCM2 accessories (omitting FB/CA/CB/CR). The pneumatic supply connects via a PT G1/2 port, and it operates at speeds of 30-500mm/s. Because the stroke is under 300mm, side-load stress is minimal, though long unsupported loads still require an external guide.
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 SAIJ125X40-30 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push thrust and 5734N of pull thrust. It can reach up to 1251 kgf at its maximum 1.0MPa pressure rating.
A rear adjusting screw acts as a mechanical stop, allowing you to shorten the 40mm nominal stroke by up to 30mm. This creates a usable travel window of 10-40mm, enabling precise end-position tuning without changing the cylinder.
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