Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-40S
The AirTAC SAIJ125X450-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling precise end-position tuning without adding external stops. It provides a usable travel window of 410 to 450 mm, letting you dial back the 450 mm nominal stroke by up to 40 mm during commissioning or product changeovers. Built with a carbon steel rod and a PT tapered port, it delivers a robust 6136 N pull force at 0.5 MPa and operates at speeds of 30-500 mm/s.
Featuring an integrated magnet for position sensing, this unit is fully compatible with AirTAC CMSE reed switches and DMSE solid-state sensors fitted into the dual-side barrel grooves. The rear adjuster functions strictly as a travel stop to set deceleration, meaning it will not hold a load without live air pressure. For secure load-holding without continuous air supply, consider pairing this cylinder with an external pilot-operated check valve or exploring the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125X450-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SAIJ125X450-40S Is Used
Variable End-Stop Setup
Dial in the exact 410-450 mm travel distance during machine commissioning to accommodate varying product lengths without swapping cylinders.
Product Changeover
Quickly adjust the retract position by up to 40 mm on packaging lines handling different package sizes, minimizing downtime between production runs.
Fine Position Tuning
Use the rear stopper to precisely set the end-of-stroke deceleration point, protecting tooling and ensuring consistent placement accuracy.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-40S the Right Cylinder?
Choose this 125 mm bore when your application requires higher thrust than an 80 mm bore (which provides 2268 N pull at 0.5 MPa), but does not need the full 9425 N pull capacity of a 160 mm variant. The adjustable stroke is ideal for machine setups requiring variable end-stops or fine-tuning across different product sizes, offering flexibility that a fixed-stroke SAI cylinder cannot match. When replacing an ISO 15552 cylinder, verify the 125 mm bore, 450 mm stroke, 40 mm adjustment, PT port thread, and the required -S magnet.
Because the 450 mm stroke is relatively long, the 32 mm diameter carbon steel rod and M27x2 thread provide substantial rigidity, but an external guide is still recommended to prevent excessive side-loading on the unsupported extended rod. Note that the SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting the FB, CA, CB, and CR brackets found on some other series.
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 SAIJ125X450-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 6136 N of push force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as an external stopper, allowing you to shorten the effective stroke from 450 mm down to 410 mm. It sets the travel end but does not lock the load without live air pressure.
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